Version 2.5.0

* Fix a crash when the app shows an action sheet on iPad
* Use the UITableViewCell as the sourceView

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: SCENEE

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,40 @@
+> Please fill out this template appropriately when filing a bug report.
+>
+> Please remove this line and everything above it before submitting.
+
+### Description
+
+### Expected behavior
+
+### Actual behavior
+
+### Steps to reproduce
+
+**Code example that reproduces the issue**
+
+
+**How do you display panel(s)?**
+
+* Add as child view controllers
+* Present modally
+
+**How many panels do you displays?**
+
+* 1 
+* 2+
+
+### Environment
+
+**Library version**
+
+**Installation method**
+
+* CocoaPods
+* Carthage
+* Swift Package Manager
+ 
+**iOS version(s)**
+
+
+**Xcode version**
+

.github/workflows/ci.yml

@@ -0,0 +1,104 @@
+name: ci
+
+on: 
+  push:
+    branches: 
+      - master
+  pull_request:
+    branches: 
+      - '*'
+
+jobs:
+  build:
+    runs-on: macOS-11
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Swift 5.4"
+      run: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.4 clean build
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_12.5.1.app/Contents/Developer
+    - name: "Swift 5.5"
+      run: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.5 clean build
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_13.0.app/Contents/Developer
+
+  build_compat:
+    runs-on: macOS-10.15
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Swift 5.1"
+      run: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.1 clean build
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_11.3.1.app/Contents/Developer
+    - name: "Swift 5.2"
+      run: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.2 clean build
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_11.7.app/Contents/Developer
+    - name: "Swift 5.3"
+      run: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.3 clean build
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_12.4.app/Contents/Developer
+
+  testing:
+    runs-on: macOS-11
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Testing in iOS 14.5"
+      run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=14.5,name=iPhone 12 Pro'
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_12.5.1.app/Contents/Developer
+    - name: "Testing in iOS 15.0"
+      run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=15.0,name=iPhone 13 Pro'
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_13.0.app/Contents/Developer
+
+  testing_compat:
+    runs-on: macOS-10.15
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Testing in iOS 13.7"
+      run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=13.7,name=iPhone 11 Pro'
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_11.7.app/Contents/Developer
+    - name: "Testing in iOS 14.4"
+      run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=14.4,name=iPhone 12 Pro'
+      env:
+        DEVELOPER_DIR: /Applications/Xcode_12.4.app/Contents/Developer
+
+  example:
+    runs-on: macOS-11
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_13.0.app/Contents/Developer
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Build Maps"
+      run: xcodebuild -workspace FloatingPanel.xcworkspace -scheme Maps -sdk iphonesimulator clean build
+    - name: "Build Stocks"
+      run: xcodebuild -workspace FloatingPanel.xcworkspace -scheme Stocks -sdk iphonesimulator clean build
+    - name: "Build Samples"
+      run: xcodebuild -workspace FloatingPanel.xcworkspace -scheme Samples -sdk iphonesimulator clean build
+
+  swiftpm:
+    runs-on: macOS-11
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_13.0.app/Contents/Developer
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Swift Package build"
+      run: swift build -Xswiftc "-sdk" -Xswiftc "`xcrun --sdk iphonesimulator --show-sdk-path`" -Xswiftc "-target" -Xswiftc "x86_64-apple-ios14.3-simulator"
+
+  carthage:
+    runs-on: macOS-11
+    steps:
+    - uses: actions/checkout@v1
+    - name: "Carthage build"
+      run: carthage build --use-xcframeworks --no-skip-current
+
+  cocoapods:
+    runs-on: macOS-11
+    steps:
+    - uses: actions/checkout@v1
+    - name: "CocoaPods: pod lib lint"
+      run: pod lib lint --allow-warnings
+    - name: "CocoaPods: pod spec lint"
+      run: pod spec lint --allow-warnings

.gitignore

@@ -17,11 +17,13 @@ DerivedData/
 *.perspectivev3
 !default.perspectivev3
 xcuserdata/
+IDEWorkspaceChecks.plis
 
 ## Other
 *.moved-aside
 *.xccheckout
 *.xcscmblueprint
+*.xcsettings
 
 ## Obj-C/Swift specific
 *.hmap
@@ -29,6 +31,9 @@ xcuserdata/
 *.dSYM.zip
 *.dSYM
 
+## Swift Package Manager Specific
+.swiftpm/
+
 ## Playgrounds
 timeline.xctimeline
 playground.xcworkspace

.swiftformat

@@ -0,0 +1,3 @@
+--header "// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license."
+--disable andOperator,anyObjectProtocol,blankLinesAroundMark,blankLinesAtEndOfScope,blankLinesAtStartOfScope,blankLinesBetweenScopes,braces,consecutiveBlankLines,consecutiveSpaces,duplicateImports,elseOnSameLine,emptyBraces,hoistPatternLet,indent,isEmpty,leadingDelimiters,linebreakAtEndOfFile,linebreaks,numberFormatting,redundantBackticks,redundantBreak,redundantExtensionACL,redundantFileprivate,redundantGet,redundantInit,redundantLet,redundantLetError,redundantNilInit,redundantObjc,redundantParens,redundantPattern,redundantRawValues,redundantReturn,redundantSelf,redundantVoidReturnType,semicolons,sortedImports,spaceAroundBraces,spaceAroundBrackets,spaceAroundComments,spaceAroundGenerics,spaceAroundOperators,spaceAroundParens,spaceInsideBraces,spaceInsideBrackets,spaceInsideComments,spaceInsideGenerics,spaceInsideParens,specifiers,strongOutlets,strongifiedSelf,todos,trailingClosures,trailingCommas,trailingSpace,typeSugar,unusedArguments,void,wrapArguments,yodaConditions
+

.travis.yml

@@ -1,44 +0,0 @@
-language: swift
-branches:
-  only:
-    - master
-cache:
-  directories:
-  - build
-  - vendor
-  - /usr/local/Homebrew
-  - $HOME/Library/Caches/Homebrew
-env:
-  global:
-  - LANG=en_US.UTF-8
-  - LC_ALL=en_US.UTF-8
-skip_cleanup: true
-jobs:
-  include:
-  - stage: carthage
-    osx_image: xcode10
-    before_install:
-    - brew update
-    - brew outdated carthage || brew upgrade carthage
-    script:
-    - carthage build --no-skip-current
-
-  - stage: podspec
-    osx_image: xcode10
-    script:
-    - pod spec lint
-
-  - stage: check Maps example
-    osx_image: xcode10
-    script:
-    - xcodebuild -scheme Maps -sdk iphonesimulator clean build
-
-  - stage: check Stocks example
-    osx_image: xcode10
-    script:
-    - xcodebuild -scheme Stocks -sdk iphonesimulator clean build
-
-  - stage: check Samples example
-    osx_image: xcode10
-    script:
-    - xcodebuild -scheme Samples -sdk iphonesimulator clean build

Documentation/FloatingPanel 2.0 Migration Guide.md

@@ -0,0 +1,294 @@
+# FloatingPanel 2.0 Migration Guide
+
+FloatingPanel 2.0 is the latest major release of FloatingPanel. As a major release, following Semantic Versioning conventions, 2.0 introduces API-breaking changes.
+
+This guide is provided in order to ease the transition of existing applications using FloatingPanel 1.x to the latest APIs, as well as explain the design and structure of new and updated functionality.
+
+## Updated Minimum Requirements
+
+* Swift 5.0
+* iOS 11 (iOS 10 is still the deployment target, but not tested well)
+* Xcode 11.0
+
+## Benefits of Upgrading
+
+* __Top, left and right positioned panel__
+  * FloatingPanel is not just a library for a bottom positioned panel, but also top, left and right positioned ones.
+* __Objective-C compatibility__
+  * The entire APIs are exposed in Objective-C. So you can use them in Objective-C directly.
+* __Flexible and explicit layout customization__
+  * `FloatingPanelLayout` is redesigned. There is no implicit rules to lay out a panel anymore.
+* __New spring animation without UIViewPropertyAnimator__
+  * The new spring animation uses [Numeric springing](http://allenchou.net/2015/04/game-math-precise-control-over-numeric-springing/) which is a very powerful tool for procedural animation. Therefore a library consumer is easy to modify a panel behavior by 2 paramters of the deceleration rate and response time.
+* __Handle the panel position anytime__
+  * `floatingPanelDidMove(_:)` delegate method is also called while a panel is moving. The method behavior becomes same as `scrollViewDidScroll(_:)` in `UIScrollViewDelegate`. And in the method a library consumer is able to change a panel location.
+* __Update the removal interaction's invocation__
+  * Now you can invoke the removal interaction at any time where you want. There is no restrictions in the library.
+* __Fix many issues depending on API design__
+  * See the following sections for details.
+
+## API Name Changes
+
+* `FloatingPanelPosition` is now `FloatingPanelState`.
+  * `FloatingPanelPosition` in v2 is used to specify a panel position(top, left, bottom and right) in a screen.
+* `FloatingPanelSurfaceView` is `SurfaceView` only in Swift.
+* `FloatingPanelBackdropView` is `BackdropView` only in Swift.
+* `FloatingPanelGrabberHandleView` is `GrabberView` only in Swift.
+* "decelerate" term is replaced with "attract" because the panel's behavior is not unidirectional, but going back and forth so that it is settled to a location.
+
+## `FloatingPanelController`
+
+* `layout` and `behavior` properties can be changed directly without using the delegate methods.
+
+```swift
+fpc.behavior = SearchPaneliPadBehavior()
+fpc.layout = SearchPaneliPadLayout()
+fpc.invalidateLayout() // If needed
+```
+
+* The second argument of `addPanel(toParent:)` changes to specify an index of subviews of a view in which a panel is added.
+
+```diff
+- public func addPanel(toParent parent: UIViewController, belowView: UIView? = nil, animated: Bool = false) {
++ public func addPanel(toParent parent: UIViewController, at viewIndex: Int = -1, animated: Bool = false) {
+```
+
+* `surfaceOriginY` is now `surfaceLocation`.
+* `updateLayout` is now `invalidateLayout`.
+* The scroll tracking API is changed a bit to support multiple scroll view tracking in the future.
+  * Now `untrack(scrollView:)` is used to disable the scroll tracking.
+
+## `FloatingPanelControllerDelegate`
+
+* `floatingPanelDidEndDragging(_ vc:willAttract:)` is added to check whether a panel will continue to move after dragging.
+* `floatingPanelDidMove(_:)` behavior changes. The method is also called in the spring animation.
+* The removal interaction delegate is updated.
+  * `floatingPanel(_:shouldRemoveAt:with:)` is added to determine whether it invokes the removal interaction in any state.
+  * `floatingPanelWillRemove(_:)` is added.
+* `floatingPanel(_: FloatingPanelController, layoutFor size: CGSize)` is added to respond to a layout change in regular size classes on iPad.
+
+```swift
+func floatingPanel(_ fpc: FloatingPanelController, layoutFor size: CGSize) -> FloatingPanelLayout {
+    if aCondition(for: size) {
+        return SearchPanelLayout()
+    }
+    return SearchPanel2Layout()
+}
+```
+
+* The `targetState` argument type of `floatingPanelWillEndDragging(_:withVelocity:targetState:)` is changed from `FloatingPanelState` to  `UnsafeMutablePointer<FloatingPanelState>` to modify a target state on demand.
+
+```swift
+func floatingPanelWillEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetState: UnsafeMutablePointer<FloatingPanelState>) {
+    switch targetState.pointee {
+        case .full:
+          // do something...
+        case .half:
+            if aCondition {
+                targetState.pointee = .tip
+            }
+        default:
+            break
+    }
+}
+```
+
+### Deprecated APIs
+
+* `floatingPanel(_:behaviorFor:)`
+  * Please update `FloatingPanelController.behavior` directly.
+* `floatingPanel(_:shouldRecognizeSimultaneouslyWith:)`
+  * Please use `FloatingPanelController.panGestureRecognizer.delegateProxy`.
+
+## `FloatingPanelLayout`
+
+* `position` property is added to determine a panel position.
+* `initialPosition` is now `initialState`.
+* `supportedPositions` and `insetFor(position:)` are replaced with `anchors` property.
+* `backdropAlphaFor(position:)` is now `backdropAlpha(for:)`.
+
+```swift
+class SearchPanelPadLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition  = .top
+    let initialState: FloatingPanelState = .tip
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            ...
+        ]
+    }
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+    ...
+}
+```
+
+### New `FloatingPanelLayoutAnchoring` classes
+
+The following objects adopting `FloatingPanelLayoutAnchoring` protocol are added to configure the flexible and explicit layout.
+
+#### `FloatingPanelLayoutAnchor`
+
+This class is used to specify a panel layout using insets from a rectangle area of the superview or safe area.
+
+* `FloatingPanelFullScreenLayout` is replaced with anchors using `.superview` reference guide.
+* `FloatingPanelLayoutAnchor(fractionalInset:edge:referenceGuide:)` lets you lay out a panel at a relative position in a reference rectangle area.
+
+```swift
+// Before:
+class MyPanelLayout: FloatingPanelLayout {
+    var initialPosition: FloatingPanelPosition {
+        return .half
+    }
+
+    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
+        switch position {
+        case .full: return 16.0
+        case .half: return 262.0
+        case .tip: return 44.0
+        case .hidden: return nil
+        }
+    }
+}
+
+// After:
+class MyPanelLayout: FloatingPanelLayout {
+    var position: FloatingPanelPosition = .bottom
+    var initialState: FloatingPanelState { .half }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+```
+
+#### `FloatingPanelIntrinsicLayoutAnchor`
+
+This class is used to specify a panel layout using offsets from the intrinsic size layout.
+
+* This replaces `FloatingPanelIntrinsicLayout`.
+* This is also able to configure a fractional layout in the intrinsic size.
+
+```swift
+// Before:
+class MyPanelIntrinsicLayout: FloatingPanelIntrinsicLayout {
+    var initialPosition: FloatingPanelPosition {
+        return .half
+    }
+    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
+        switch position {
+        case .full: return 16.0
+        case .half: return 262.0
+        case .tip: return 44.0
+        case .hidden: return nil
+        }
+    }
+}
+
+// After:
+class MyPanelIntrinsicLayout: FloatingPanelLayout {
+    var position: FloatingPanelPosition = .bottom
+    var initialState: FloatingPanelState { .full }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 16.0, referenceGuide: .safeArea),
+            .half: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+```
+
+### Deprecated APIs
+
+* `.topInteractionBuffer` and `.bottomInteractionBuffer`.
+  * Please control the max/min range of the motion in `floatingPanelDidMove(_:)` delegate method as below.
+
+```swift
+func floatingPanelDidMove(_ fpc: FloatingPanelController) {
+    if fpc.isAttracting == false {
+        let loc = fpc.surfaceLocation
+        let minY = fpc.surfaceLocation(for: .full).y - 6.0
+        let maxY = fpc.surfaceLocation(for: .tip).y + 6.0
+        fpc.surfaceLocation = CGPoint(x: loc.x, y: min(max(loc.y, minY), maxY))
+    }
+}
+```
+
+## `FloatingPanelBehavior`
+
+* `.springDecelerationRate` and `.springResponseTime` properties are added to control the new spring effect of Numeric springing.
+
+### Deprecated APIs
+
+* `addAnimator(_:to:)`, `removeAnimator(_:from:)`
+  * They are moved into `floatingPanel(_:animatorForPresentingTo:)` and  `floatingPanel(_:animatorForDismissingWith:)` of `FloatingPanelControllerDelegate` because they are used for view transitions.
+* `interactionAnimator(_:to:with:)`, `moveAnimator(_:from:to:)`
+  * They are removed because the animators are replaced with the new spring effect.
+* `removalVelocity`, `removalProgress`
+  * They are replaced with `floatingPanel(_:shouldRemoveAt:with:)` of `FloatingPanelControllerDelegate`
+* `removalInteractionAnimator(_:with:)`
+  * It is integrated with `floatingPanel(_:animatorForDismissingWith:)` of `FloatingPanelControllerDelegate`.
+
+## `SurfaceView`
+
+* `SurfaceAppearance` class and `SurfaceView.appearance` property are added to specify the rounding corners, shadows and background color.
+  * `SurfaceView.appearance` property avoids `Ambiguous use of 'cornerRadius'` error, for instance.
+  * `SurfaceAppearance` enables to apply layered box shadows into a surface to materialize it.
+
+```swift
+// Before:
+fpc.surfaceView.cornerRadius = 6.0
+fpc.surfaceView.backgroundColor = .clear
+fpc.surfaceView.shadowHidden = false
+fpc.surfaceView.shadowColor = .black
+fpc.surfaceView.shadowOffset = CGSize(width: 0, height: 16)
+fpc.surfaceView.shadowRadius = 16.0
+
+// After:
+let appearance = SurfaceAppearance()
+appearance.cornerRadius = 8.0
+appearance.backgroundColor = .clear
+
+let shadow = SurfaceAppearance.Shadow()
+shadow.color = .black
+shadow.offset = CGSize(width: 0, height: 16)
+shadow.radius = 16
+shadow.spread = 8
+appearance.shadows = [shadow]
+
+fpc.surfaceView.appearance = appearance
+```
+
+* These properties are changed for the top, left and right positioned panel.
+  * `grabberTopPadding` is now `grabberHandlePadding`.
+  * `topGrabberBarHeight` is now `grabberAreaOffset`.
+  * `grabberHandleWidth` and `grabberHandleHeight` are replaced with `grabberHandleSize`.
+
+## `BackdropView`
+
+* The dismissal action of the backdrop is disabled by default.
+  * You can enable it to set `BackdropView.dismissalTapGestureRecognizer.isEnabled` to `true`.
+
+## `FloatingPanelPanGestureRecognizer`
+
+* `delegateProxy` property is added to intercept the gesture recognizer delegate.
+
+```swift
+func layoutPanelForPad() {
+    fpc.behavior = SearchPaneliPadBehavior()
+    fpc.panGestureRecognizer.delegateProxy = self
+}
+
+func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+    return false
+}
+```
+
+## Miscellaneous
+
+* `UISpringTimingParameters(decelerationRate:frequencyResponse:initialVelocity:)` initializer is added.
+* The directory structure and file names in the Xcode project changes.

Examples/Maps-SwiftUI/Maps-SwiftUI.xcodeproj/project.pbxproj

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+}

Examples/Maps-SwiftUI/Maps/ContentView.swift

@@ -0,0 +1,33 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+import MapKit
+
+struct ContentView: View {
+    @State private var region = MKCoordinateRegion(
+        center: CLLocationCoordinate2D(latitude: 37.623198015869235, longitude: -122.43066818432008),
+        span: MKCoordinateSpan(latitudeDelta: 0.4425100023575723, longitudeDelta: 0.28543697435880233)
+    )
+
+    var body: some View {
+        ZStack {
+            Map(coordinateRegion: $region)
+                .ignoresSafeArea()
+            statusBarBlur
+        }
+    }
+
+    private var statusBarBlur: some View {
+        GeometryReader { geometry in
+            VisualEffectBlur()
+                .frame(height: geometry.safeAreaInsets.top)
+                .ignoresSafeArea()
+        }
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/FloatingPanelView.swift

@@ -0,0 +1,121 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+import SwiftUI
+
+/// A proxy for exposing the methods of the floating panel controller.
+public struct FloatingPanelProxy {
+    /// The associated floating panel controller.
+    public weak var fpc: FloatingPanelController?
+
+    /// Tracks the specified scroll view to correspond with the scroll.
+    ///
+    /// - Parameter scrollView: Specify a scroll view to continuously and
+    ///   seamlessly work in concert with interactions of the surface view.
+    public func track(scrollView: UIScrollView) {
+        fpc?.track(scrollView: scrollView)
+    }
+
+    /// Moves the floating panel to the specified position.
+    ///
+    /// - Parameters:
+    ///   - floatingPanelState: The state to move to.
+    ///   - animated: `true` to animate the transition to the new state; `false`
+    ///     otherwise.
+    public func move(
+        to floatingPanelState: FloatingPanelState,
+        animated: Bool,
+        completion: (() -> Void)? = nil
+    ) {
+        fpc?.move(to: floatingPanelState, animated: animated, completion: completion)
+    }
+}
+
+/// A view with an associated floating panel.
+struct FloatingPanelView<Content: View, FloatingPanelContent: View>: UIViewControllerRepresentable {
+    /// A type that conforms to the `FloatingPanelControllerDelegate` protocol.
+    var delegate: FloatingPanelControllerDelegate?
+
+    /// The behavior for determining the adjusted content offsets.
+    @Environment(\.contentInsetAdjustmentBehavior) var contentInsetAdjustmentBehavior
+
+    /// Constants that define how a panel content fills in the surface.
+    @Environment(\.contentMode) var contentMode
+
+    /// The floating panel grabber handle offset.
+    @Environment(\.grabberHandlePadding) var grabberHandlePadding
+
+    /// The floating panel `surfaceView` appearance.
+    @Environment(\.surfaceAppearance) var surfaceAppearance
+
+    /// The view builder that creates the floating panel parent view content.
+    @ViewBuilder var content: Content
+
+    /// The view builder that creates the floating panel content.
+    @ViewBuilder var floatingPanelContent: (FloatingPanelProxy) -> FloatingPanelContent
+
+    public func makeUIViewController(context: Context) -> UIHostingController<Content> {
+        let hostingController = UIHostingController(rootView: content)
+        hostingController.view.backgroundColor = nil
+        // We need to wait for the current runloop cycle to complete before our
+        // view is actually added (into the view hierarchy), otherwise the
+        // environment is not ready yet.
+        DispatchQueue.main.async {
+            context.coordinator.setupFloatingPanel(hostingController)
+        }
+        return hostingController
+    }
+
+    public func updateUIViewController(
+        _ uiViewController: UIHostingController<Content>,
+        context: Context
+    ) {
+        context.coordinator.updateIfNeeded()
+    }
+
+    public func makeCoordinator() -> Coordinator {
+        Coordinator(parent: self)
+    }
+
+    /// `FloatingPanelView` coordinator.
+    ///
+    /// Responsible to setup the view hierarchy and floating panel.
+    final class Coordinator {
+        private let parent: FloatingPanelView<Content, FloatingPanelContent>
+        private lazy var fpc = FloatingPanelController()
+
+        init(parent: FloatingPanelView<Content, FloatingPanelContent>) {
+            self.parent = parent
+        }
+
+        func setupFloatingPanel(_ parentViewController: UIViewController) {
+            updateIfNeeded()
+            let panelContent = parent.floatingPanelContent(FloatingPanelProxy(fpc: fpc))
+            let hostingViewController = UIHostingController(
+                rootView: panelContent,
+                ignoresKeyboard: true
+            )
+            hostingViewController.view.backgroundColor = nil
+            fpc.set(contentViewController: hostingViewController)
+            fpc.addPanel(toParent: parentViewController, at: 1, animated: false)
+        }
+
+        func updateIfNeeded() {
+            if fpc.contentInsetAdjustmentBehavior != parent.contentInsetAdjustmentBehavior {
+                fpc.contentInsetAdjustmentBehavior = parent.contentInsetAdjustmentBehavior
+            }
+            if fpc.contentMode != parent.contentMode {
+                fpc.contentMode = parent.contentMode
+            }
+            if fpc.delegate !== parent.delegate {
+                fpc.delegate = parent.delegate
+            }
+            if fpc.surfaceView.grabberHandlePadding != parent.grabberHandlePadding {
+                fpc.surfaceView.grabberHandlePadding = parent.grabberHandlePadding
+            }
+            if fpc.surfaceView.appearance != parent.surfaceAppearance {
+                fpc.surfaceView.appearance = parent.surfaceAppearance
+            }
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/UIHostingController+ignoreKeyboard.swift

@@ -0,0 +1,44 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+/// This extension makes sure SwiftUI views are not affected by iOS keyboard.
+///
+/// Credits to https://steipete.me/posts/disabling-keyboard-avoidance-in-swiftui-uihostingcontroller/
+extension UIHostingController {
+    public convenience init(rootView: Content, ignoresKeyboard: Bool) {
+        self.init(rootView: rootView)
+
+        if ignoresKeyboard {
+            guard let viewClass = object_getClass(view) else { return }
+
+            let viewSubclassName = String(
+                cString: class_getName(viewClass)
+            ).appending("_IgnoresKeyboard")
+
+            if let viewSubclass = NSClassFromString(viewSubclassName) {
+                object_setClass(view, viewSubclass)
+            } else {
+                guard
+                    let viewClassNameUtf8 = (viewSubclassName as NSString).utf8String,
+                    let viewSubclass = objc_allocateClassPair(viewClass, viewClassNameUtf8, 0)
+                else { return }
+
+                if let method = class_getInstanceMethod(
+                    viewClass,
+                    NSSelectorFromString("keyboardWillShowWithNotification:")
+                ) {
+                    let keyboardWillShow: @convention(block) (AnyObject, AnyObject) -> Void = { _, _ in }
+                    class_addMethod(
+                        viewSubclass,
+                        NSSelectorFromString("keyboardWillShowWithNotification:"),
+                        imp_implementationWithBlock(keyboardWillShow),
+                        method_getTypeEncoding(method)
+                    )
+                }
+                objc_registerClassPair(viewSubclass)
+                object_setClass(view, viewSubclass)
+            }
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/View+floatingPanel.swift

@@ -0,0 +1,31 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+import SwiftUI
+
+extension View {
+    /// Presents a floating panel using the given closure as its content.
+    ///
+    /// The modifier's content view builder receives a `FloatingPanelProxy`
+    /// instance; you use the proxy's methods to interact with the associated
+    /// `FloatingPanelController`.
+    ///
+    /// - Parameters:
+    ///   - delegate: A type that conforms to the
+    ///     `FloatingPanelControllerDelegate` protocol. You have comprehensive
+    ///     control over the floating panel behavior when you use a delegate.
+    ///   - floatingPanelContent: The floating panel content. This view builder
+    ///     receives a `FloatingPanelProxy` instance that you use to interact
+    ///     with the `FloatingPanelController`.
+    public func floatingPanel<FloatingPanelContent: View>(
+        delegate: FloatingPanelControllerDelegate? = nil,
+        @ViewBuilder _ floatingPanelContent: @escaping (_: FloatingPanelProxy) -> FloatingPanelContent
+    ) -> some View {
+        FloatingPanelView(
+            delegate: delegate,
+            content: { self },
+            floatingPanelContent: floatingPanelContent
+        )
+        .ignoresSafeArea()
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/View+floatingPanelContentInsetAdjustmentBehavior.swift

@@ -0,0 +1,38 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+import SwiftUI
+
+struct ContentInsetKey: EnvironmentKey {
+    static var defaultValue: FloatingPanelController.ContentInsetAdjustmentBehavior = .always
+}
+
+extension EnvironmentValues {
+    /// The behavior for determining the adjusted content offsets.
+    var contentInsetAdjustmentBehavior: FloatingPanelController.ContentInsetAdjustmentBehavior {
+        get { self[ContentInsetKey.self] }
+        set { self[ContentInsetKey.self] = newValue }
+    }
+}
+
+extension View {
+    /// Sets the content inset adjustment behavior for floating panels within
+    /// this view.
+    ///
+    /// Use this modifier to set a specific content inset adjustment behavior
+    /// for floating panel instances within a view:
+    ///
+    ///     MainView()
+    ///         .floatingPanel { _ in
+    ///             FloatingPanelContent()
+    ///         }
+    ///         .floatingPanelContentInsetAdjustmentBehavior(.never)
+    ///
+    /// - Parameter contentInsetAdjustmentBehavior: The content inset adjustment
+    ///   behavior to set.
+    public func floatingPanelContentInsetAdjustmentBehavior(
+        _ contentInsetAdjustmentBehavior: FloatingPanelController.ContentInsetAdjustmentBehavior
+    ) -> some View {
+        environment(\.contentInsetAdjustmentBehavior, contentInsetAdjustmentBehavior)
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/View+floatingPanelContentMode.swift

@@ -0,0 +1,37 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+import SwiftUI
+
+struct ContentModeKey: EnvironmentKey {
+    static var defaultValue: FloatingPanelController.ContentMode = .static
+}
+
+extension EnvironmentValues {
+    /// Used to determine how the floating panel controller lays out the content
+    /// view when the surface position changes.
+    var contentMode: FloatingPanelController.ContentMode {
+        get { self[ContentModeKey.self] }
+        set { self[ContentModeKey.self] = newValue }
+    }
+}
+
+extension View {
+    /// Sets the content mode for floating panels within this view.
+    ///
+    /// Use this modifier to set a specific content mode for floating panel
+    /// instances within a view:
+    ///
+    ///     MainView()
+    ///         .floatingPanel { _ in
+    ///             FloatingPanelContent()
+    ///         }
+    ///         .floatingPanelContentMode(.static)
+    ///
+    /// - Parameter contentMode: The content mode to set.
+    public func floatingPanelContentMode(
+        _ contentMode: FloatingPanelController.ContentMode
+    ) -> some View {
+        environment(\.contentMode, contentMode)
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/View+floatingPanelGrabberHandlePadding.swift

@@ -0,0 +1,36 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+import SwiftUI
+
+struct GrabberHandlePaddingKey: EnvironmentKey {
+    static var defaultValue: CGFloat = 6.0
+}
+
+extension EnvironmentValues {
+    /// The offset of the grabber handle from the interactive edge.
+    var grabberHandlePadding: CGFloat {
+        get { self[GrabberHandlePaddingKey.self] }
+        set { self[GrabberHandlePaddingKey.self] = newValue }
+    }
+}
+
+extension View {
+    /// Sets the grabber handle padding for floating panels within this view.
+    ///
+    /// Use this modifier to set a specific padding to floating panel instances
+    /// within a view:
+    ///
+    ///     MainView()
+    ///         .floatingPanel { _ in
+    ///             FloatingPanelContent()
+    ///         }
+    ///         .floatingPanelGrabberHandlePadding(16)
+    ///
+    /// - Parameter padding: The grabber handle padding to set.
+    public func floatingPanelGrabberHandlePadding(
+        _ padding: CGFloat
+    ) -> some View {
+        environment(\.grabberHandlePadding, padding)
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanel/View+floatingPanelSurfaceAppearance.swift

@@ -0,0 +1,44 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+import SwiftUI
+
+struct SurfaceAppearanceKey: EnvironmentKey {
+    static var defaultValue = SurfaceAppearance()
+}
+
+extension EnvironmentValues {
+    /// The appearance of a surface view.
+    var surfaceAppearance: SurfaceAppearance {
+        get { self[SurfaceAppearanceKey.self] }
+        set { self[SurfaceAppearanceKey.self] = newValue }
+    }
+}
+
+extension View {
+    /// Sets the surface appearance for floating panels within this view.
+    ///
+    /// Use this modifier to set a specific surface appearance for floating
+    /// panel instances within a view:
+    ///
+    ///     MainView()
+    ///         .floatingPanel { _ in
+    ///             FloatingPanelContent()
+    ///         }
+    ///         .floatingPanelSurfaceAppearance(.transparent)
+    ///
+    ///     extension SurfaceAppearance {
+    ///         static var transparent: SurfaceAppearance {
+    ///             let appearance = SurfaceAppearance()
+    ///             appearance.backgroundColor = .clear
+    ///             return appearance
+    ///         }
+    ///     }
+    ///
+    /// - Parameter surfaceAppearance: The surface appearance to set.
+    public func floatingPanelSurfaceAppearance(
+        _ surfaceAppearance: SurfaceAppearance
+    ) -> some View {
+        environment(\.surfaceAppearance, surfaceAppearance)
+    }
+}

Examples/Maps-SwiftUI/Maps/FloatingPanelContentView.swift

@@ -0,0 +1,43 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+struct FloatingPanelContentView: View {
+    @State private var searchText = ""
+    @State private var isShowingCancelButton = false
+    var proxy: FloatingPanelProxy
+
+    var body: some View {
+        VStack(spacing: 0) {
+            searchBar
+            resultsList
+        }
+        // 👇🏻 for the floating panel grabber handle.
+        .padding(.top, 6)
+        .background(
+            VisualEffectBlur(blurStyle: .systemMaterial)
+                // ⚠️ If the `VisualEffectBlur` view receives taps, it's going
+                // to mess up with the whole panel and render it
+                // non-interactive, make sure it never receives any taps.
+                .allowsHitTesting(false)
+        )
+        .ignoresSafeArea()
+    }
+
+    var searchBar: some View {
+        SearchBar(
+            "Search for a place or address",
+            text: $searchText,
+            isShowingCancelButton: $isShowingCancelButton
+        ) { isFocused in
+            proxy.move(to: isFocused ? .full : .half, animated: true)
+            isShowingCancelButton = isFocused
+        } onCancel: {
+            UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
+        }
+    }
+
+    var resultsList: some View {
+        ResultsList(onScrollViewCreated: proxy.track(scrollView:))
+    }
+}

Examples/Maps-SwiftUI/Maps/HostingCell.swift

@@ -0,0 +1,49 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+/// A `UITableViewCell` that accepts a SwiftUI view as its content.
+///
+/// Credits to https://noahgilmore.com/blog/swiftui-self-sizing-cells/ .
+public final class HostingCell<Content: View>: UITableViewCell {
+    private let hostingController = UIHostingController<Content?>(
+        rootView: nil,
+        ignoresKeyboard: true
+    )
+
+    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
+        super.init(style: style, reuseIdentifier: reuseIdentifier)
+        hostingController.view.backgroundColor = nil
+        backgroundColor = .clear
+    }
+
+    @available(*, unavailable)
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    public func set(rootView: Content, parentController: UIViewController) {
+        hostingController.rootView = rootView
+        hostingController.view.invalidateIntrinsicContentSize()
+
+        let requiresControllerMove = hostingController.parent != parentController
+        if requiresControllerMove {
+            parentController.addChild(hostingController)
+        }
+
+        if !contentView.subviews.contains(hostingController.view) {
+            contentView.addSubview(hostingController.view)
+            hostingController.view.translatesAutoresizingMaskIntoConstraints = false
+            contentView.addConstraints([
+                hostingController.view.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
+                hostingController.view.topAnchor.constraint(equalTo: contentView.topAnchor),
+                hostingController.view.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
+                hostingController.view.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
+            ])
+        }
+
+        if requiresControllerMove {
+            hostingController.didMove(toParent: parentController)
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/MapsApp.swift

@@ -0,0 +1,18 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+@main
+struct MapsApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+                .floatingPanel(delegate: SearchPanelPhoneDelegate()) { proxy in
+                    FloatingPanelContentView(proxy: proxy)
+                }
+                .floatingPanelSurfaceAppearance(.phone)
+                .floatingPanelContentMode(.fitToBounds)
+                .floatingPanelContentInsetAdjustmentBehavior(.never)
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/Representable/SearchBar.swift

@@ -0,0 +1,74 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+/// UIKit's `UISearchBar`brought to SwiftUI.
+public struct SearchBar: UIViewRepresentable {
+    var title: String
+    @Binding var text: String
+    @Binding var isShowingCancelButton: Bool
+    var onEditingChanged: (Bool) -> Void
+    var onCancel: () -> Void
+
+    public init(
+        _ title: String = "",
+        text: Binding<String>,
+        isShowingCancelButton: Binding<Bool>,
+        onEditingChanged: @escaping (Bool) -> Void = { _ in },
+        onCancel: @escaping () -> Void
+    ) {
+        self.title = title
+        self._text = text
+        self._isShowingCancelButton = isShowingCancelButton
+        self.onEditingChanged = onEditingChanged
+        self.onCancel = onCancel
+    }
+
+    public func makeUIView(context: UIViewRepresentableContext<SearchBar>) -> UISearchBar {
+        let searchBar = UISearchBar(frame: .zero)
+        searchBar.searchBarStyle = .minimal
+        searchBar.isTranslucent = true
+        searchBar.placeholder = title
+        searchBar.delegate = context.coordinator
+        searchBar.autocapitalizationType = .none
+        return searchBar
+    }
+
+    public func updateUIView(_ uiView: UISearchBar, context: UIViewRepresentableContext<SearchBar>) {
+        uiView.text = text
+        uiView.placeholder = title
+        uiView.setShowsCancelButton(isShowingCancelButton, animated: true)
+    }
+
+    public func makeCoordinator() -> SearchBar.Coordinator {
+        Coordinator(parent: self)
+    }
+
+    public class Coordinator: NSObject, UISearchBarDelegate {
+        var parent: SearchBar
+
+        init(parent: SearchBar) {
+            self.parent = parent
+        }
+
+        public func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
+            parent.text = searchText
+        }
+
+        public func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
+            parent.onEditingChanged(true)
+        }
+
+        public func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
+            searchBar.resignFirstResponder()
+        }
+
+        public func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
+            parent.onEditingChanged(false)
+        }
+
+        public func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
+            parent.onCancel()
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/Representable/VisualEffectBlur.swift

@@ -0,0 +1,69 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+@available(iOS, introduced: 13, deprecated: 15, message: "Use iOS 15 material API.")
+public struct VisualEffectBlur<Content: View>: UIViewRepresentable {
+    var blurStyle: UIBlurEffect.Style = .systemMaterial
+    var vibrancyStyle: UIVibrancyEffectStyle? = nil
+    @ViewBuilder var content: Content
+
+    public func makeUIView(context: Context) -> UIVisualEffectView {
+        context.coordinator.blurView
+    }
+
+    public func updateUIView(_ view: UIVisualEffectView, context: Context) {
+        context.coordinator.update(
+            content: content,
+            blurStyle: blurStyle,
+            vibrancyStyle: vibrancyStyle
+        )
+    }
+
+    public func makeCoordinator() -> Coordinator {
+        Coordinator(content: content)
+    }
+
+    public class Coordinator {
+        let blurView = UIVisualEffectView()
+        let vibrancyView = UIVisualEffectView()
+        let hostingController: UIHostingController<Content>
+
+        init(content: Content) {
+            hostingController = UIHostingController(rootView: content)
+            hostingController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+            hostingController.view.backgroundColor = nil
+            blurView.contentView.addSubview(vibrancyView)
+
+            blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+            vibrancyView.contentView.addSubview(hostingController.view)
+            vibrancyView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        }
+
+        func update(content: Content, blurStyle: UIBlurEffect.Style, vibrancyStyle: UIVibrancyEffectStyle?) {
+            hostingController.rootView = content
+
+            let blurEffect = UIBlurEffect(style: blurStyle)
+            blurView.effect = blurEffect
+
+            if let vibrancyStyle = vibrancyStyle {
+                vibrancyView.effect = UIVibrancyEffect(blurEffect: blurEffect, style: vibrancyStyle)
+            } else {
+                vibrancyView.effect = nil
+            }
+
+            hostingController.view.setNeedsDisplay()
+        }
+    }
+}
+
+public extension VisualEffectBlur where Content == EmptyView {
+    init(
+        blurStyle: UIBlurEffect.Style = .systemMaterial,
+        vibrancyStyle: UIVibrancyEffectStyle? = nil
+    ) {
+        self.init(blurStyle: blurStyle, vibrancyStyle: vibrancyStyle) {
+            EmptyView()
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/ResultsList.swift

@@ -0,0 +1,138 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import SwiftUI
+
+struct ResultsList: UIViewControllerRepresentable {
+    var onScrollViewCreated: (_ scrollView: UIScrollView) -> Void
+
+    func makeUIViewController(
+        context: Context
+    ) -> ResultsTableViewController {
+        let rtvc = ResultsTableViewController()
+        onScrollViewCreated(rtvc.tableView)
+        return rtvc
+    }
+
+    func updateUIViewController(
+        _ uiViewController: ResultsTableViewController,
+        context: Context
+    ) {
+    }
+}
+
+final class ResultsTableViewController: UITableViewController {
+    private let reuseIdentifier = "HostingCell<ResultListCell>"
+
+    private enum Section: CaseIterable {
+        case main
+    }
+
+    private struct TableViewItem: Hashable {
+        let color: Color
+        let symbolName: String
+        let title: String
+        let description: String
+    }
+
+    private var dataSource: UITableViewDiffableDataSource<Section, TableViewItem>?
+
+    // MARK: Lifecycle
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        tableView.backgroundColor = nil
+        tableView.register(HostingCell<ResultListCell>.self, forCellReuseIdentifier: reuseIdentifier)
+        configureDataSource()
+    }
+
+    // MARK: UITableViewDataSource
+
+    private func configureDataSource() {
+        dataSource = UITableViewDiffableDataSource
+        <Section, TableViewItem>(tableView: tableView) { [weak self] tableView, _, tableItem -> UITableViewCell? in
+            self?.tableView(tableView, cellForTableViewItem: tableItem)
+        }
+        tableView.dataSource = dataSource
+
+        var snapshot = NSDiffableDataSourceSnapshot<Section, TableViewItem>()
+        snapshot.appendSections([.main])
+        let results: [TableViewItem] = (1...100).map {
+            TableViewItem(
+                color: Color(red: 255 / 255.0, green: 94 / 255.0 , blue: 94 / 255.0),
+                symbolName: "heart.fill",
+                title: "Favorites",
+                description: "\($0) Places"
+            )
+        }
+        snapshot.appendItems(results, toSection: .main)
+        dataSource?.apply(snapshot, animatingDifferences: false)
+    }
+
+    private func tableView(
+        _ tableView: UITableView,
+        cellForTableViewItem tableViewItem: TableViewItem
+    ) -> UITableViewCell {
+        let cell: HostingCell<ResultListCell> = tableView.dequeueReusableCell(withIdentifier: reuseIdentifier) as! HostingCell<ResultListCell>
+        setupResultTableViewCell(
+            cell,
+            color: tableViewItem.color,
+            symbolName: tableViewItem.symbolName,
+            title: tableViewItem.title,
+            description: tableViewItem.description
+        )
+        return cell
+    }
+
+    private func setupResultTableViewCell(
+        _ cell: HostingCell<ResultListCell>,
+        color: Color,
+        symbolName: String,
+        title: String,
+        description: String
+    ) {
+        cell.set(
+            rootView: ResultListCell(
+                color: color,
+                symbolName: symbolName,
+                title: title,
+                description: description
+            ),
+            parentController: self
+        )
+    }
+
+    // MARK: UITableViewDelegate
+
+    override func tableView(
+        _ tableView: UITableView,
+        didSelectRowAt indexPath: IndexPath
+    ) {
+        tableView.deselectRow(at: indexPath, animated: true)
+    }
+}
+
+struct ResultListCell: View {
+    let color: Color
+    let symbolName: String
+    let title: String
+    let description: String
+
+    var body: some View {
+        HStack {
+            Image(systemName: symbolName)
+                .foregroundColor(.white)
+                .font(.headline)
+                .padding(8)
+                .background(Circle().fill(color))
+            VStack(alignment: .leading, spacing: 8) {
+                Text(title)
+                    .font(.system(size: 20, weight: .bold))
+                    .frame(maxWidth: .infinity, alignment: .leading)
+                Text(description)
+                    .font(.system(size: 13))
+                    .foregroundColor(Color(.secondaryLabel))
+            }
+        }
+        .padding()
+    }
+}

Examples/Maps-SwiftUI/Maps/SearchPanelPhoneDelegate.swift

@@ -0,0 +1,11 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+
+final class SearchPanelPhoneDelegate: FloatingPanelControllerDelegate {
+    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
+        if vc.state == .full {
+            UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
+        }
+    }
+}

Examples/Maps-SwiftUI/Maps/SurfaceAppearance+phone.swift

@@ -0,0 +1,13 @@
+// Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
+
+import FloatingPanel
+
+extension FloatingPanel.SurfaceAppearance {
+    static var phone: SurfaceAppearance {
+        let appearance = SurfaceAppearance()
+        appearance.cornerCurve = .continuous
+        appearance.cornerRadius = 8.0
+        appearance.backgroundColor = .clear
+        return appearance
+    }
+}

Examples/Maps/Maps.xcodeproj/project.pbxproj

@@ -7,13 +7,17 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		543844BD23D2BE2000D5EDE4 /* MapKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 543844BC23D2BE2000D5EDE4 /* MapKit.framework */; };
+		549A5F59244673FE0025F312 /* SearchViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 549A5F58244673FE0025F312 /* SearchViewController.swift */; };
+		549D23D2233C77D5008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */; };
+		549D23D3233C77D5008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		54B5112A216C3D840033A6F3 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B51129216C3D840033A6F3 /* AppDelegate.swift */; };
 		54B5112C216C3D840033A6F3 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B5112B216C3D840033A6F3 /* ViewController.swift */; };
 		54B5112F216C3D840033A6F3 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 54B5112D216C3D840033A6F3 /* Main.storyboard */; };
 		54B51131216C3D860033A6F3 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 54B51130216C3D860033A6F3 /* Assets.xcassets */; };
 		54B51134216C3D860033A6F3 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 54B51132216C3D860033A6F3 /* LaunchScreen.storyboard */; };
-		54B5113F216C407F0033A6F3 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 54B5113E216C407F0033A6F3 /* FloatingPanel.framework */; };
-		54B51140216C407F0033A6F3 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 54B5113E216C407F0033A6F3 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
+		54E26CB624A989090066C720 /* Utils.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E26CB524A989090066C720 /* Utils.swift */; };
+		54E26CB824A98E310066C720 /* DetailViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E26CB724A98E310066C720 /* DetailViewController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -23,7 +27,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				54B51140216C407F0033A6F3 /* FloatingPanel.framework in Embed Frameworks */,
+				549D23D3233C77D5008EF4D7 /* FloatingPanel.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -31,6 +35,9 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		543844BC23D2BE2000D5EDE4 /* MapKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MapKit.framework; path = System/Library/Frameworks/MapKit.framework; sourceTree = SDKROOT; };
+		549A5F58244673FE0025F312 /* SearchViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchViewController.swift; sourceTree = "<group>"; };
+		549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		54B51126216C3D840033A6F3 /* Maps.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Maps.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		54B51129216C3D840033A6F3 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		54B5112B216C3D840033A6F3 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -38,7 +45,8 @@
 		54B51130216C3D860033A6F3 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		54B51133216C3D860033A6F3 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		54B51135216C3D860033A6F3 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		54B5113E216C407F0033A6F3 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		54E26CB524A989090066C720 /* Utils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Utils.swift; sourceTree = "<group>"; };
+		54E26CB724A98E310066C720 /* DetailViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DetailViewController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -46,19 +54,29 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				54B5113F216C407F0033A6F3 /* FloatingPanel.framework in Frameworks */,
+				543844BD23D2BE2000D5EDE4 /* MapKit.framework in Frameworks */,
+				549D23D2233C77D5008EF4D7 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		543844BB23D2BE1F00D5EDE4 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				543844BC23D2BE2000D5EDE4 /* MapKit.framework */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 		54B5111D216C3D840033A6F3 = {
 			isa = PBXGroup;
 			children = (
-				54B5113E216C407F0033A6F3 /* FloatingPanel.framework */,
+				549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */,
 				54B51128216C3D840033A6F3 /* Maps */,
 				54B51127216C3D840033A6F3 /* Products */,
+				543844BB23D2BE1F00D5EDE4 /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -75,6 +93,9 @@
 			children = (
 				54B51129216C3D840033A6F3 /* AppDelegate.swift */,
 				54B5112B216C3D840033A6F3 /* ViewController.swift */,
+				549A5F58244673FE0025F312 /* SearchViewController.swift */,
+				54E26CB724A98E310066C720 /* DetailViewController.swift */,
+				54E26CB524A989090066C720 /* Utils.swift */,
 				54B5112D216C3D840033A6F3 /* Main.storyboard */,
 				54B51130216C3D860033A6F3 /* Assets.xcassets */,
 				54B51132216C3D860033A6F3 /* LaunchScreen.storyboard */,
@@ -155,8 +176,11 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				549A5F59244673FE0025F312 /* SearchViewController.swift in Sources */,
 				54B5112C216C3D840033A6F3 /* ViewController.swift in Sources */,
+				54E26CB824A98E310066C720 /* DetailViewController.swift in Sources */,
 				54B5112A216C3D840033A6F3 /* AppDelegate.swift in Sources */,
+				54E26CB624A989090066C720 /* Utils.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -305,14 +329,14 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Maps/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -324,14 +348,14 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Maps/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;

Examples/Maps/Maps/AppDelegate.swift

@@ -1,10 +1,4 @@
-//
-//  AppDelegate.swift
-//  Maps
-//
-//  Created by Shin Yamamoto on 2018/10/09.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import UIKit
 

Examples/Maps/Maps/Base.lproj/Main.storyboard

@@ -1,11 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14313.18" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
-    <device id="retina5_9" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17506" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina5_9" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14283.14"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17505"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
@@ -27,9 +25,10 @@
                                     <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                 </view>
-                                <blurEffect style="light"/>
+                                <blurEffect style="prominent"/>
                             </visualEffectView>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <constraints>
                             <constraint firstItem="5Jw-n2-Cpw" firstAttribute="trailing" secondItem="8bC-Xf-vdC" secondAttribute="trailing" id="1Fg-Be-qfh"/>
@@ -41,7 +40,6 @@
                             <constraint firstItem="6Tk-OE-BBY" firstAttribute="top" secondItem="d9i-3g-8Ja" secondAttribute="bottom" id="Y1G-hr-aEX"/>
                             <constraint firstItem="d9i-3g-8Ja" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="diB-Ij-HN3"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                     </view>
                     <connections>
                         <outlet property="mapView" destination="5Jw-n2-Cpw" id="WVC-rU-mLe"/>
@@ -51,18 +49,18 @@
             </objects>
             <point key="canvasLocation" x="136.80000000000001" y="133.00492610837438"/>
         </scene>
-        <!--Search Panel View Controller-->
+        <!--Search View Controller-->
         <scene sceneID="kXy-li-p3C">
             <objects>
-                <viewController storyboardIdentifier="SearchPanel" useStoryboardIdentifierAsRestorationIdentifier="YES" id="0S1-Lk-JgE" customClass="SearchPanelViewController" customModule="Maps" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController storyboardIdentifier="SearchViewController" useStoryboardIdentifierAsRestorationIdentifier="YES" id="0S1-Lk-JgE" customClass="SearchViewController" customModule="Maps" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Ncl-E9-yRn">
                         <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <visualEffectView opaque="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Ye3-uU-bq3">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="900"/>
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="ED1-gT-FBj">
-                                    <rect key="frame" x="0.0" y="0.0" width="375" height="900"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                     <subviews>
                                         <searchBar contentMode="redraw" searchBarStyle="minimal" translatesAutoresizingMaskIntoConstraints="NO" id="Zcj-SE-gb8">
@@ -70,7 +68,7 @@
                                             <textInputTraits key="textInputTraits"/>
                                         </searchBar>
                                         <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="D7r-re-InH">
-                                            <rect key="frame" x="0.0" y="66" width="375" height="748"/>
+                                            <rect key="frame" x="0.0" y="66" width="375" height="746"/>
                                             <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                             <view key="tableHeaderView" contentMode="scaleToFill" id="u28-LY-hIh" customClass="SearchHeaderView" customModule="Maps" customModuleProvider="target">
                                                 <rect key="frame" x="0.0" y="0.0" width="375" height="116"/>
@@ -173,7 +171,7 @@
                                                     <rect key="frame" x="0.0" y="144" width="375" height="70"/>
                                                     <autoresizingMask key="autoresizingMask"/>
                                                     <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="LzC-B9-Adb" id="evr-60-laS">
-                                                        <rect key="frame" x="0.0" y="0.0" width="375" height="69.666666666666671"/>
+                                                        <rect key="frame" x="0.0" y="0.0" width="375" height="70"/>
                                                         <autoresizingMask key="autoresizingMask"/>
                                                         <subviews>
                                                             <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="like" translatesAutoresizingMaskIntoConstraints="NO" id="GEk-yE-lLq">
@@ -185,7 +183,7 @@
                                                                 </constraints>
                                                             </imageView>
                                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillEqually" spacing="2" translatesAutoresizingMaskIntoConstraints="NO" id="Gfl-Oy-rsy">
-                                                                <rect key="frame" x="57" y="11.999999999999996" width="303" height="45.666666666666657"/>
+                                                                <rect key="frame" x="57" y="12" width="303" height="46"/>
                                                                 <subviews>
                                                                     <label opaque="NO" userInteractionEnabled="NO" tag="1" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Favorites" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Spf-8L-Ne6">
                                                                         <rect key="frame" x="0.0" y="0.0" width="303" height="22"/>
@@ -194,7 +192,7 @@
                                                                         <nil key="highlightedColor"/>
                                                                     </label>
                                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="0 Places" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="gyo-3V-7U8">
-                                                                        <rect key="frame" x="0.0" y="24" width="303" height="21.666666666666671"/>
+                                                                        <rect key="frame" x="0.0" y="24" width="303" height="22"/>
                                                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
                                                                         <color key="textColor" red="0.57647058819999997" green="0.57647058819999997" blue="0.57647058819999997" alpha="1" colorSpace="calibratedRGB"/>
                                                                         <nil key="highlightedColor"/>
@@ -227,22 +225,22 @@
                                         <constraint firstAttribute="trailing" secondItem="D7r-re-InH" secondAttribute="trailing" id="BES-GA-Btp"/>
                                         <constraint firstItem="D7r-re-InH" firstAttribute="leading" secondItem="ED1-gT-FBj" secondAttribute="leading" id="UTe-YL-17h"/>
                                         <constraint firstItem="Zcj-SE-gb8" firstAttribute="top" secondItem="ED1-gT-FBj" secondAttribute="top" constant="6" id="apU-Pd-PEO"/>
-                                        <constraint firstAttribute="bottom" secondItem="D7r-re-InH" secondAttribute="bottom" constant="86" id="vfS-Lx-TXz"/>
+                                        <constraint firstAttribute="bottom" secondItem="D7r-re-InH" secondAttribute="bottom" id="vfS-Lx-TXz"/>
                                         <constraint firstItem="D7r-re-InH" firstAttribute="top" secondItem="Zcj-SE-gb8" secondAttribute="bottom" constant="4" id="vro-cd-B9c"/>
                                         <constraint firstItem="Zcj-SE-gb8" firstAttribute="leading" secondItem="ED1-gT-FBj" secondAttribute="leading" id="wMb-L2-Z0W"/>
                                     </constraints>
                                 </view>
-                                <blurEffect style="extraLight"/>
+                                <blurEffect style="prominent"/>
                             </visualEffectView>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="G74-X7-Za8"/>
                         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
                             <constraint firstItem="Ye3-uU-bq3" firstAttribute="leading" secondItem="G74-X7-Za8" secondAttribute="leading" id="Kr2-sU-ZWZ"/>
-                            <constraint firstItem="Ye3-uU-bq3" firstAttribute="bottom" secondItem="Ncl-E9-yRn" secondAttribute="bottom" constant="88" id="aWM-s3-3o4"/>
+                            <constraint firstItem="Ye3-uU-bq3" firstAttribute="bottom" secondItem="Ncl-E9-yRn" secondAttribute="bottom" id="aWM-s3-3o4"/>
                             <constraint firstItem="Ye3-uU-bq3" firstAttribute="trailing" secondItem="G74-X7-Za8" secondAttribute="trailing" id="fEL-8y-Acc"/>
                             <constraint firstItem="Ye3-uU-bq3" firstAttribute="top" secondItem="Ncl-E9-yRn" secondAttribute="top" id="w77-ba-FrJ"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="G74-X7-Za8"/>
                     </view>
                     <connections>
                         <outlet property="searchBar" destination="Zcj-SE-gb8" id="BH7-Gy-RG5"/>
@@ -254,6 +252,44 @@
             </objects>
             <point key="canvasLocation" x="789.60000000000002" y="133.5832083958021"/>
         </scene>
+        <!--Detail View Controller-->
+        <scene sceneID="5tH-Ya-PzB">
+            <objects>
+                <viewController storyboardIdentifier="DetailViewController" id="Tp2-MF-IFz" customClass="DetailViewController" customModule="Maps" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="FmO-AT-4Y7">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <visualEffectView opaque="NO" contentMode="scaleToFill" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="c3d-2e-0b1">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                                <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                                <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="9fL-a5-0LS">
+                                    <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                                    <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                                    <subviews>
+                                        <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="kP7-56-wlG">
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                                            <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                        </tableView>
+                                    </subviews>
+                                    <constraints>
+                                        <constraint firstItem="kP7-56-wlG" firstAttribute="leading" secondItem="9fL-a5-0LS" secondAttribute="leading" id="6gf-GO-cnv"/>
+                                        <constraint firstAttribute="bottom" secondItem="kP7-56-wlG" secondAttribute="bottom" id="WrH-tz-UQF"/>
+                                        <constraint firstItem="kP7-56-wlG" firstAttribute="top" secondItem="9fL-a5-0LS" secondAttribute="top" id="aJk-bz-lVc"/>
+                                        <constraint firstAttribute="trailing" secondItem="kP7-56-wlG" secondAttribute="trailing" id="sE0-9V-Rot"/>
+                                    </constraints>
+                                </view>
+                                <blurEffect style="extraLight"/>
+                            </visualEffectView>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="ctv-Dd-JUc"/>
+                        <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="EDp-D2-xcT" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="1447" y="133"/>
+        </scene>
     </scenes>
     <resources>
         <image name="food" width="60" height="60"/>

Examples/Maps/Maps/DetailViewController.swift

@@ -0,0 +1,7 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+class DetailViewController: UIViewController {
+    var item: LocationItem?
+}

Examples/Maps/Maps/SearchViewController.swift

@@ -0,0 +1,184 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+// MARK: - UITableViewDelegate
+
+extension ViewController: UITableViewDelegate {
+    func setUpSearchView() {
+        searchVC.loadViewIfNeeded()
+        searchVC.tableView.delegate = self
+        searchVC.searchBar.placeholder = "Search for a place or address"
+        let isPad = (traitCollection.userInterfaceIdiom == .pad)
+        searchVC.items = [
+            .init(mark: "mark", title: "Marked Location" + (isPad ? " (Left panel)" : ""), subtitle: "Golden Gate Bridge, San Francisco"),
+            .init(mark: "mark", title: "Marked Location"  + (isPad ? " (Right panel)" : ""), subtitle: "San Francisco Museum of Modern Art"),
+        ]
+        searchVC.items.append(contentsOf: (0...98).map {
+            .init(mark: "like", title: "Favorites", subtitle: "\($0) Places")
+        })
+    }
+
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        tableView.deselectRow(at: indexPath, animated: true)
+
+        deactivate(searchBar: searchVC.searchBar)
+
+        // Show a detail panel
+        switch indexPath.row {
+        case 0:
+            detailVC.item = searchVC.items[safe: 0]
+
+            // Show detail vc in the left positioned panel
+            switch traitCollection.userInterfaceIdiom {
+            case .pad:
+                detailFpc.layout = DetailPanelPadLeftLayout()
+                detailFpc.surfaceView.containerMargins = UIEdgeInsets(top: 0.0, left: 16.0, bottom: 0.0, right: 0.0)
+            default:
+                detailFpc.layout = DetailPanelPhoneLayout()
+                detailFpc.surfaceView.containerMargins = .zero
+            }
+            detailFpc.addPanel(toParent: self, animated: true)
+        case 1:
+            detailVC.item = searchVC.items[safe: 1]
+
+            // Show detail vc in the right positioned panel
+            switch traitCollection.userInterfaceIdiom {
+            case .pad:
+                detailFpc.layout = DetailPanelPadRightLayout()
+                detailFpc.surfaceView.containerMargins = UIEdgeInsets(top: 0.0, left: 0.0, bottom: 0.0, right: 16.0)
+            default:
+                detailFpc.layout = DetailPanelPhoneLayout()
+                detailFpc.surfaceView.containerMargins = .zero
+            }
+            detailFpc.addPanel(toParent: self, animated: true)
+        default:
+            break
+        }
+    }
+}
+
+// MARK: - Models
+
+struct LocationItem {
+    let mark: String
+    let title: String
+    let subtitle: String
+
+    init(mark: String, title: String, subtitle: String) {
+        self.mark = mark
+        self.title = title
+        self.subtitle = subtitle
+    }
+}
+
+// MARK: -
+
+class SearchViewController: UIViewController, UITableViewDataSource {
+    @IBOutlet weak var tableView: UITableView!
+    @IBOutlet weak var searchBar: UISearchBar!
+    @IBOutlet weak var visualEffectView: UIVisualEffectView!
+
+    var items: [LocationItem] = []
+
+    // For iOS 10 only
+    private lazy var shadowLayer: CAShapeLayer = CAShapeLayer()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        tableView.dataSource = self
+        searchBar.setSearchText(fontSize: 15.0)
+
+        hideHeader(animated: false)
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        if #available(iOS 11, *) {
+        } else {
+            // Exmaple: Add rounding corners on iOS 10
+            visualEffectView.layer.cornerRadius = 9.0
+            visualEffectView.clipsToBounds = true
+
+            // Exmaple: Add shadow manually on iOS 10
+            view.layer.insertSublayer(shadowLayer, at: 0)
+            let rect = visualEffectView.frame
+            let path = UIBezierPath(roundedRect: rect,
+                                    byRoundingCorners: [.topLeft, .topRight],
+                                    cornerRadii: CGSize(width: 9.0, height: 9.0))
+            shadowLayer.frame = visualEffectView.frame
+            shadowLayer.shadowPath = path.cgPath
+            shadowLayer.shadowColor = UIColor.black.cgColor
+            shadowLayer.shadowOffset = CGSize(width: 0.0, height: 1.0)
+            shadowLayer.shadowOpacity = 0.2
+            shadowLayer.shadowRadius = 3.0
+        }
+    }
+
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return items.count
+    }
+
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        if let cell = cell as? SearchCell, let item = items[safe: indexPath.row] {
+            cell.iconImageView.image = UIImage(named: item.mark)
+            cell.titleLabel.text = item.title
+            cell.subTitleLabel.text = item.subtitle
+        }
+        return cell
+    }
+
+    func showHeader(animated: Bool) {
+        changeHeader(height: 116.0, aniamted: animated)
+    }
+
+    func hideHeader(animated: Bool) {
+        changeHeader(height: 0.0, aniamted: animated)
+    }
+
+    private func changeHeader(height: CGFloat, aniamted: Bool) {
+        guard let headerView = tableView.tableHeaderView, headerView.bounds.height != height else { return }
+        if aniamted == false {
+            updateHeader(height: height)
+            return
+        }
+        tableView.beginUpdates()
+        UIView.animate(withDuration: 0.25) {
+            self.updateHeader(height: height)
+        }
+        tableView.endUpdates()
+    }
+
+    private func updateHeader(height: CGFloat) {
+        guard let headerView = tableView.tableHeaderView else { return }
+        var frame = headerView.frame
+        frame.size.height = height
+        self.tableView.tableHeaderView?.frame = frame
+    }
+}
+
+class SearchCell: UITableViewCell {
+    @IBOutlet weak var iconImageView: UIImageView!
+    @IBOutlet weak var titleLabel: UILabel!
+    @IBOutlet weak var subTitleLabel: UILabel!
+}
+
+class SearchHeaderView: UIView {
+    required init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        self.clipsToBounds = true
+    }
+}
+
+extension UISearchBar {
+    func setSearchText(fontSize: CGFloat) {
+        if #available(iOS 13, *) {
+            let font = searchTextField.font
+            searchTextField.font = font?.withSize(fontSize)
+        } else {
+            let textField = value(forKey: "_searchField") as! UITextField
+            textField.font = textField.font?.withSize(fontSize)
+        }
+    }
+}

Examples/Maps/Maps/Utils.swift

@@ -0,0 +1,19 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+extension Collection {
+    subscript (safe index: Index) -> Element? {
+        return indices.contains(index) ? self[index] : nil
+    }
+}
+
+extension UIViewController {
+    var isLandscape: Bool {
+        if #available(iOS 13.0, *) {
+            return view.window?.windowScene?.interfaceOrientation.isLandscape ?? false
+        } else {
+            return UIApplication.shared.statusBarOrientation.isLandscape
+        }
+    }
+}

Examples/Maps/Maps/ViewController.swift

@@ -1,42 +1,51 @@
-//
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import UIKit
 import MapKit
 import FloatingPanel
 
-class ViewController: UIViewController, MKMapViewDelegate, UISearchBarDelegate, FloatingPanelControllerDelegate {
-    var fpc: FloatingPanelController!
-    var searchVC: SearchPanelViewController!
+class ViewController: UIViewController {
+    typealias PanelDelegate = FloatingPanelControllerDelegate & UIGestureRecognizerDelegate
+
+    // Search Panel
+    lazy var fpc = FloatingPanelController()
+    lazy var fpcDelegate: PanelDelegate =
+        (traitCollection.userInterfaceIdiom == .pad) ? SearchPanelPadDelegate(owner: self) : SearchPanelPhoneDelegate(owner: self)
+    lazy var searchVC =
+        storyboard?.instantiateViewController(withIdentifier: "SearchViewController") as! SearchViewController
+
+    // Detail Panel
+    lazy var detailFpc = FloatingPanelController()
+    lazy var detailFpcDelegate: PanelDelegate =
+        (traitCollection.userInterfaceIdiom == .pad) ? DetailPanelPadDelegate(owner: self) : DetailPanelPhoneDelegate(owner: self)
+    lazy var detailVC =
+        storyboard?.instantiateViewController(withIdentifier: "DetailViewController") as! DetailViewController
 
     @IBOutlet weak var mapView: MKMapView!
 
     override func viewDidLoad() {
         super.viewDidLoad()
-        // Do any additional setup after loading the view, typically from a nib.
-        // Initialize FloatingPanelController
-        fpc = FloatingPanelController()
-        fpc.delegate = self
-
-        // Initialize FloatingPanelController and add the view
-        fpc.surfaceView.backgroundColor = .clear
-        fpc.surfaceView.cornerRadius = 9.0
-        fpc.surfaceView.shadowHidden = false
-
-        searchVC = storyboard?.instantiateViewController(withIdentifier: "SearchPanel") as? SearchPanelViewController
-
-        // Set a content view controller
+        fpc.contentMode = .fitToBounds
+        fpc.delegate = fpcDelegate
         fpc.set(contentViewController: searchVC)
         fpc.track(scrollView: searchVC.tableView)
 
+        detailFpc.isRemovalInteractionEnabled = true
+        detailFpc.set(contentViewController: detailVC)
+
+        switch traitCollection.userInterfaceIdiom {
+        case .pad:
+            layoutPanelForPad()
+        default:
+            layoutPanelForPhone()
+        }
+
         setupMapView()
+        setUpSearchView()
     }
 
     override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)
-        //  Add FloatingPanel to a view with animation.
-        fpc.addPanel(toParent: self, animated: true)
 
         // Must be here
         searchVC.searchBar.delegate = self
@@ -47,6 +56,338 @@ class ViewController: UIViewController, MKMapViewDelegate, UISearchBarDelegate,
         teardownMapView()
     }
 
+    func layoutPanelForPad() {
+        fpc.behavior = SearchPaneliPadBehavior()
+        fpc.panGestureRecognizer.delegateProxy = fpcDelegate
+
+        // Not use addPanel(toParent:) because of the Auto Layout configuration of fpc.view.
+        view.addSubview(fpc.view)
+        addChild(fpc)
+        fpc.view.frame = view.bounds // Needed for a correct safe area configuration
+        fpc.view.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            fpc.view.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
+            fpc.view.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0 ),
+            fpc.view.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0.0),
+            fpc.view.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
+        ])
+        fpc.show(animated: false) { [weak self] in
+            guard let self = self else { return }
+            self.didMove(toParent: self)
+        }
+
+        fpc.setAppearanceForPad()
+        detailFpc.setAppearanceForPad()
+    }
+
+    func layoutPanelForPhone() {
+        fpc.track(scrollView: searchVC.tableView) // Only track the table view on iPhone
+        fpc.addPanel(toParent: self, animated: true)
+        fpc.setAppearanceForPhone()
+        detailFpc.setAppearanceForPhone()
+    }
+}
+
+extension FloatingPanelController {
+    func setAppearanceForPhone() {
+        let appearance = SurfaceAppearance()
+        if #available(iOS 13.0, *) {
+            appearance.cornerCurve = .continuous
+        }
+        appearance.cornerRadius = 8.0
+        appearance.backgroundColor = .clear
+        surfaceView.appearance = appearance
+    }
+
+    func setAppearanceForPad() {
+        view.clipsToBounds = false
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 8.0
+        let shadow = SurfaceAppearance.Shadow()
+        shadow.color = UIColor.black
+        shadow.offset = CGSize(width: 0, height: 16)
+        shadow.radius = 16
+        shadow.spread = 8
+        appearance.shadows = [shadow]
+        appearance.backgroundColor = .clear
+        surfaceView.appearance = appearance
+    }
+}
+
+// MARK: - UISearchBarDelegate
+
+extension ViewController: UISearchBarDelegate {
+    func activate(searchBar: UISearchBar) {
+        searchBar.showsCancelButton = true
+        searchVC.showHeader(animated: true)
+        searchVC.tableView.alpha = 1.0
+        detailVC.dismiss(animated: true, completion: nil)
+    }
+    func deactivate(searchBar: UISearchBar) {
+        searchBar.resignFirstResponder()
+        searchBar.showsCancelButton  = false
+        searchVC.hideHeader(animated: true)
+    }
+
+    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
+        deactivate(searchBar: searchBar)
+        UIView.animate(withDuration: 0.25) {
+            self.fpc.move(to: .half, animated: false)
+        }
+    }
+
+    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
+        activate(searchBar: searchBar)
+        UIView.animate(withDuration: 0.25) { [weak self] in
+            self?.fpc.move(to: .full, animated: false)
+        }
+    }
+}
+
+// MARK: - iPhone
+
+class SearchPanelPhoneDelegate: NSObject, FloatingPanelControllerDelegate, UIGestureRecognizerDelegate {
+    unowned let owner: ViewController
+
+    init(owner: ViewController) {
+        self.owner = owner
+    }
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        switch newCollection.verticalSizeClass {
+        case .compact:
+            let appearance = vc.surfaceView.appearance
+            appearance.borderWidth = 1.0 / owner.traitCollection.displayScale
+            appearance.borderColor = UIColor.black.withAlphaComponent(0.2)
+            vc.surfaceView.appearance = appearance
+            return SearchPanelLandscapeLayout()
+        default:
+            let appearance = vc.surfaceView.appearance
+            appearance.borderWidth = 0.0
+            appearance.borderColor = nil
+            vc.surfaceView.appearance = appearance
+            return FloatingPanelBottomLayout()
+        }
+    }
+
+    func floatingPanelDidMove(_ vc: FloatingPanelController) {
+        debugPrint("surfaceLocation: ", vc.surfaceLocation)
+        let loc = vc.surfaceLocation
+
+        if vc.isAttracting == false {
+            let minY = vc.surfaceLocation(for: .full).y - 6.0
+            let maxY = vc.surfaceLocation(for: .tip).y + 6.0
+            vc.surfaceLocation = CGPoint(x: loc.x, y: min(max(loc.y, minY), maxY))
+        }
+
+        let tipY = vc.surfaceLocation(for: .tip).y
+        if loc.y > tipY - 44.0 {
+            let progress = max(0.0, min((tipY  - loc.y) / 44.0, 1.0))
+            owner.searchVC.tableView.alpha = progress
+        } else {
+            owner.searchVC.tableView.alpha = 1.0
+        }
+        debugPrint("NearbyState : ",vc.nearbyState)
+    }
+
+    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
+        if vc.state == .full {
+            owner.searchVC.searchBar.showsCancelButton = false
+            owner.searchVC.searchBar.resignFirstResponder()
+        }
+    }
+
+    func floatingPanelWillEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetState: UnsafeMutablePointer<FloatingPanelState>) {
+        if targetState.pointee != .full {
+            owner.searchVC.hideHeader(animated: true)
+        }
+        if targetState.pointee == .tip {
+            vc.contentMode = .static
+        }
+    }
+
+    func floatingPanelDidEndAttracting(_ fpc: FloatingPanelController) {
+        fpc.contentMode = .fitToBounds
+    }
+}
+
+class SearchPanelLandscapeLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition  = .bottom
+    let initialState: FloatingPanelState = .tip
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
+        ]
+    }
+    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
+        if #available(iOS 11.0, *) {
+            return [
+                surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
+                surfaceView.widthAnchor.constraint(equalToConstant: 291),
+            ]
+        } else {
+            return [
+                surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 8.0),
+                surfaceView.widthAnchor.constraint(equalToConstant: 291),
+            ]
+        }
+    }
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.0
+    }
+}
+
+class DetailPanelPhoneDelegate: NSObject, FloatingPanelControllerDelegate, UIGestureRecognizerDelegate {
+    unowned let owner: ViewController
+
+    init(owner: ViewController) {
+        self.owner = owner
+    }
+}
+
+class DetailPanelPhoneLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition  = .bottom
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+        ]
+    }
+    let initialState: FloatingPanelState = .full
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.0
+    }
+}
+
+// MARK: - iPad
+
+class SearchPanelPadDelegate: NSObject, FloatingPanelControllerDelegate, UIGestureRecognizerDelegate {
+    unowned let owner: ViewController
+
+    init(owner: ViewController) {
+        self.owner = owner
+    }
+
+    func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        if newCollection.horizontalSizeClass == .compact {
+            fpc.surfaceView.containerMargins = .zero
+            return FloatingPanelBottomLayout()
+        }
+        fpc.surfaceView.containerMargins = UIEdgeInsets(top: .leastNonzeroMagnitude, // For top left/right rounding corners
+                                                        left: 16,
+                                                        bottom: 0.0,
+                                                        right: 0.0)
+        return SearchPanelPadLayout()
+    }
+
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+
+    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
+        if vc.state == .full {
+            owner.searchVC.searchBar.showsCancelButton = false
+            owner.searchVC.searchBar.resignFirstResponder()
+        }
+    }
+
+    func floatingPanelWillEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetState: UnsafeMutablePointer<FloatingPanelState>) {
+        if targetState.pointee != .full {
+            owner.searchVC.hideHeader(animated: true)
+        }
+    }
+}
+
+class SearchPanelPadLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition  = .top
+    let initialState: FloatingPanelState = .tip
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 80.0, edge: .top, referenceGuide: .superview),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 200.0, edge: .top, referenceGuide: .superview),
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 60.0, edge: .bottom, referenceGuide: .superview),
+        ]
+    }
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.0
+    }
+    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
+        return [
+            surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor),
+            surfaceView.widthAnchor.constraint(equalToConstant: 375),
+        ]
+    }
+}
+
+class SearchPaneliPadBehavior: FloatingPanelBehavior {
+    var springDecelerationRate: CGFloat {
+        return UIScrollView.DecelerationRate.fast.rawValue - 0.003
+    }
+    var springResponseTime: CGFloat {
+        return 0.3
+    }
+    var momentumProjectionRate: CGFloat {
+        return UIScrollView.DecelerationRate.fast.rawValue
+    }
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool {
+        return true
+    }
+}
+
+class DetailPanelPadDelegate: NSObject, FloatingPanelControllerDelegate, UIGestureRecognizerDelegate {
+    unowned let owner: ViewController
+
+    init(owner: ViewController) {
+        self.owner = owner
+    }
+
+    func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        if newCollection.horizontalSizeClass == .compact {
+            fpc.surfaceView.containerMargins = .zero
+            return FloatingPanelBottomLayout()
+        }
+        if let item = owner.detailVC.item, item.title.contains("Right") {
+            fpc.surfaceView.containerMargins = UIEdgeInsets(top: 0.0, left: 0.0, bottom: 0.0, right: .leastNonzeroMagnitude)
+            return DetailPanelPadRightLayout()
+        }
+        fpc.surfaceView.containerMargins = UIEdgeInsets(top: 0.0, left: .leastNonzeroMagnitude, bottom: 0.0, right: 0.0)
+        return DetailPanelPadLeftLayout()
+    }
+
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+}
+
+class DetailPanelPadLeftLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition  = .left
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 375, edge: .left, referenceGuide: .superview)
+        ]
+    }
+    let initialState: FloatingPanelState = .full
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.0
+    }
+}
+
+class DetailPanelPadRightLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition  = .right
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 375, edge: .right, referenceGuide: .superview)
+        ]
+    }
+    let initialState: FloatingPanelState = .full
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.0
+    }
+}
+
+// MARK: - MKMapViewDelegate
+
+extension ViewController: MKMapViewDelegate {
     func setupMapView() {
         let center = CLLocationCoordinate2D(latitude: 37.623198015869235,
                                             longitude: -122.43066818432008)
@@ -64,191 +405,4 @@ class ViewController: UIViewController, MKMapViewDelegate, UISearchBarDelegate,
         mapView.delegate = nil
         mapView = nil
     }
-
-    // MARK: UISearchBarDelegate
-
-    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
-        searchBar.resignFirstResponder()
-        searchBar.showsCancelButton  = false
-        searchVC.hideHeader()
-        fpc.move(to: .half, animated: true)
-    }
-
-    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
-        searchBar.showsCancelButton = true
-        searchVC.showHeader()
-        searchVC.tableView.alpha = 1.0
-        fpc.move(to: .full, animated: true)
-    }
-
-    // MARK: FloatingPanelControllerDelegate
-    
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        switch newCollection.verticalSizeClass {
-        case .compact:
-            fpc.surfaceView.borderWidth = 1.0 / traitCollection.displayScale
-            fpc.surfaceView.borderColor = UIColor.black.withAlphaComponent(0.2)
-            return SearchPanelLandscapeLayout()
-        default:
-            fpc.surfaceView.borderWidth = 0.0
-            fpc.surfaceView.borderColor = nil
-            return nil
-        }
-    }
-
-    func floatingPanelDidMove(_ vc: FloatingPanelController) {
-        let y = vc.surfaceView.frame.origin.y
-        let tipY = vc.originYOfSurface(for: .tip)
-        if y > tipY - 44.0 {
-            let progress = max(0.0, min((tipY  - y) / 44.0, 1.0))
-            self.searchVC.tableView.alpha = progress
-        }
-    }
-
-    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
-        if vc.position == .full {
-            searchVC.searchBar.showsCancelButton = false
-            searchVC.searchBar.resignFirstResponder()
-        }
-    }
-
-    func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {
-        if targetPosition != .full {
-            searchVC.hideHeader()
-        }
-
-        UIView.animate(withDuration: 0.25,
-                       delay: 0.0,
-                       options: .allowUserInteraction,
-                       animations: {
-                        if targetPosition == .tip {
-                            self.searchVC.tableView.alpha = 0.0
-                        } else {
-                            self.searchVC.tableView.alpha = 1.0
-                        }
-        }, completion: nil)
-    }
-}
-
-class SearchPanelViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
-
-    @IBOutlet weak var tableView: UITableView!
-    @IBOutlet weak var searchBar: UISearchBar!
-    @IBOutlet weak var visualEffectView: UIVisualEffectView!
-    
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        tableView.dataSource = self
-        tableView.delegate = self
-        searchBar.placeholder = "Search for a place or address"
-        let textField = searchBar.value(forKey: "_searchField") as! UITextField
-        textField.font = UIFont(name: textField.font!.fontName, size: 15.0)
-
-        hideHeader()
-
-    }
-
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        if #available(iOS 10, *) {
-            visualEffectView.layer.cornerRadius = 9.0
-            visualEffectView.clipsToBounds = true
-        }
-    }
-
-    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return 2
-    }
-
-    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
-        if let cell = cell as? SearchCell {
-            switch indexPath.row {
-            case 0:
-                cell.iconImageView.image = UIImage(named: "mark")
-                cell.titleLabel.text = "Marked Location"
-                cell.subTitleLabel.text = "Golden Gate Bridge, San Francisco"
-            case 1:
-                cell.iconImageView.image = UIImage(named: "like")
-                cell.titleLabel.text = "Favorites"
-                cell.subTitleLabel.text = "0 Places"
-            default:
-                break
-            }
-        }
-        return cell
-    }
-
-    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        tableView.deselectRow(at: indexPath, animated: false)
-    }
-
-    func showHeader() {
-        changeHeader(height: 116.0)
-    }
-
-    func hideHeader() {
-        changeHeader(height: 0.0)
-    }
-
-    func changeHeader(height: CGFloat) {
-        tableView.beginUpdates()
-        if let headerView = tableView.tableHeaderView  {
-            UIView.animate(withDuration: 0.25) {
-                var frame = headerView.frame
-                frame.size.height = height
-                self.tableView.tableHeaderView?.frame = frame
-            }
-        }
-        tableView.endUpdates()
-    }
-}
-
-public class SearchPanelLandscapeLayout: FloatingPanelLayout {
-    public var initialPosition: FloatingPanelPosition {
-        return .tip
-    }
-    
-    public var supportedPositions: Set<FloatingPanelPosition> {
-        return [.full, .tip]
-    }
-
-    public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 16.0
-        case .tip: return 69.0
-        default: return nil
-        }
-    }
-
-    public func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
-        if #available(iOS 11.0, *) {
-            return [
-                surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
-                surfaceView.widthAnchor.constraint(equalToConstant: 291),
-            ]
-        } else {
-            return [
-                surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 8.0),
-                surfaceView.widthAnchor.constraint(equalToConstant: 291),
-            ]
-        }
-    }
-
-    public func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat {
-        return 0.0
-    }
-}
-
-class SearchCell: UITableViewCell {
-    @IBOutlet weak var iconImageView: UIImageView!
-    @IBOutlet weak var titleLabel: UILabel!
-    @IBOutlet weak var subTitleLabel: UILabel!
-}
-
-class SearchHeaderView: UIView {
-    required init?(coder aDecoder: NSCoder) {
-        super.init(coder: aDecoder)
-        self.clipsToBounds = true
-    }
 }

Examples/Samples/Samples.xcodeproj/project.pbxproj

@@ -7,17 +7,32 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		5442E22425FC51AF00A26F43 /* ImageViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22325FC51AF00A26F43 /* ImageViewController.swift */; };
+		5442E22825FC51E200A26F43 /* MultiPanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22725FC51E200A26F43 /* MultiPanelController.swift */; };
+		5442E22C25FC521F00A26F43 /* SettingsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22B25FC521F00A26F43 /* SettingsViewController.swift */; };
+		5442E23025FC525200A26F43 /* TabBarViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22F25FC525200A26F43 /* TabBarViewController.swift */; };
+		5442E23425FC528400A26F43 /* DetailViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E23325FC528400A26F43 /* DetailViewController.swift */; };
+		5442E23A25FC52CD00A26F43 /* ModalViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E23925FC52CD00A26F43 /* ModalViewController.swift */; };
+		5442E24025FC533800A26F43 /* DebugTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E23F25FC533800A26F43 /* DebugTableViewController.swift */; };
+		5442E24425FC538200A26F43 /* InspectorViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E24325FC538200A26F43 /* InspectorViewController.swift */; };
+		5442E24A25FC53C100A26F43 /* DebugTextViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E24925FC53C100A26F43 /* DebugTextViewController.swift */; };
+		5442E25225FC541700A26F43 /* NestedScrollViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E25125FC541700A26F43 /* NestedScrollViewController.swift */; };
+		54496C59263A7E5A0031E0C8 /* UseCaseController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54496C58263A7E5A0031E0C8 /* UseCaseController.swift */; };
 		545DB9EE21511E6300CA77B8 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9ED21511E6300CA77B8 /* AppDelegate.swift */; };
-		545DB9F021511E6300CA77B8 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9EF21511E6300CA77B8 /* ViewController.swift */; };
+		545DB9F021511E6300CA77B8 /* MainViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9EF21511E6300CA77B8 /* MainViewController.swift */; };
 		545DB9F321511E6300CA77B8 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F121511E6300CA77B8 /* Main.storyboard */; };
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 		545DBA0E21511E6400CA77B8 /* SampleUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0D21511E6400CA77B8 /* SampleUITests.swift */; };
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-		54CDC5D8215BBE23007D205C /* UIComponents.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D7215BBE23007D205C /* UIComponents.swift */; };
+		546341A125C6415100CA0596 /* UseCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341A025C6415100CA0596 /* UseCase.swift */; };
+		546341AC25C6426500CA0596 /* CustomState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341AB25C6426500CA0596 /* CustomState.swift */; };
+		549D23CB233C7779008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; };
+		549D23CC233C7779008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
+		54B51116216AFE5F0033A6F3 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B51115216AFE5F0033A6F3 /* Extensions.swift */; };
+		54CDC5D8215BBE23007D205C /* Components.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D7215BBE23007D205C /* Components.swift */; };
+		54EAD35B263A75EB006A36EA /* Layouts.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54EAD35A263A75EB006A36EA /* Layouts.swift */; };
+		54EAD365263A765F006A36EA /* PagePanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54EAD364263A765F006A36EA /* PagePanelController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -38,13 +53,13 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXCopyFilesBuildPhase section */
-		54B5111C216C3B300033A6F3 /* Embed Frameworks */ = {
+		549D23CD233C7779008EF4D7 /* Embed Frameworks */ = {
 			isa = PBXCopyFilesBuildPhase;
 			buildActionMask = 2147483647;
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				54B5113D216C40670033A6F3 /* FloatingPanel.framework in Embed Frameworks */,
+				549D23CC233C7779008EF4D7 /* FloatingPanel.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -52,9 +67,20 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		5442E22325FC51AF00A26F43 /* ImageViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageViewController.swift; sourceTree = "<group>"; };
+		5442E22725FC51E200A26F43 /* MultiPanelController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MultiPanelController.swift; sourceTree = "<group>"; };
+		5442E22B25FC521F00A26F43 /* SettingsViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsViewController.swift; sourceTree = "<group>"; };
+		5442E22F25FC525200A26F43 /* TabBarViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TabBarViewController.swift; sourceTree = "<group>"; };
+		5442E23325FC528400A26F43 /* DetailViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DetailViewController.swift; sourceTree = "<group>"; };
+		5442E23925FC52CD00A26F43 /* ModalViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ModalViewController.swift; sourceTree = "<group>"; };
+		5442E23F25FC533800A26F43 /* DebugTableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DebugTableViewController.swift; sourceTree = "<group>"; };
+		5442E24325FC538200A26F43 /* InspectorViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InspectorViewController.swift; sourceTree = "<group>"; };
+		5442E24925FC53C100A26F43 /* DebugTextViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DebugTextViewController.swift; sourceTree = "<group>"; };
+		5442E25125FC541700A26F43 /* NestedScrollViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NestedScrollViewController.swift; sourceTree = "<group>"; };
+		54496C58263A7E5A0031E0C8 /* UseCaseController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCaseController.swift; sourceTree = "<group>"; };
 		545DB9EA21511E6300CA77B8 /* Samples.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Samples.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		545DB9ED21511E6300CA77B8 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
-		545DB9EF21511E6300CA77B8 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
+		545DB9EF21511E6300CA77B8 /* MainViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MainViewController.swift; sourceTree = "<group>"; };
 		545DB9F221511E6300CA77B8 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
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 		545DB9F721511E6400CA77B8 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
@@ -65,9 +91,13 @@
 		545DBA0921511E6400CA77B8 /* SamplesUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = SamplesUITests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		545DBA0D21511E6400CA77B8 /* SampleUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SampleUITests.swift; sourceTree = "<group>"; };
 		545DBA0F21511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		54B51115216AFE5F0033A6F3 /* UIExtensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIExtensions.swift; sourceTree = "<group>"; };
-		54B5113B216C40670033A6F3 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
-		54CDC5D7215BBE23007D205C /* UIComponents.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIComponents.swift; sourceTree = "<group>"; };
+		546341A025C6415100CA0596 /* UseCase.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCase.swift; sourceTree = "<group>"; };
+		546341AB25C6426500CA0596 /* CustomState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CustomState.swift; sourceTree = "<group>"; };
+		549D23CA233C7779008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		54B51115216AFE5F0033A6F3 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
+		54CDC5D7215BBE23007D205C /* Components.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Components.swift; sourceTree = "<group>"; };
+		54EAD35A263A75EB006A36EA /* Layouts.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Layouts.swift; sourceTree = "<group>"; };
+		54EAD364263A765F006A36EA /* PagePanelController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PagePanelController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -75,7 +105,7 @@
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 			buildActionMask = 2147483647;
 			files = (
-				54B5113C216C40670033A6F3 /* FloatingPanel.framework in Frameworks */,
+				549D23CB233C7779008EF4D7 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -96,15 +126,31 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		5442E22225FC519700A26F43 /* ViewControllers */ = {
+			isa = PBXGroup;
+			children = (
+				5442E23F25FC533800A26F43 /* DebugTableViewController.swift */,
+				5442E24925FC53C100A26F43 /* DebugTextViewController.swift */,
+				5442E23325FC528400A26F43 /* DetailViewController.swift */,
+				5442E24325FC538200A26F43 /* InspectorViewController.swift */,
+				5442E22325FC51AF00A26F43 /* ImageViewController.swift */,
+				5442E25125FC541700A26F43 /* NestedScrollViewController.swift */,
+				5442E23925FC52CD00A26F43 /* ModalViewController.swift */,
+				5442E22725FC51E200A26F43 /* MultiPanelController.swift */,
+				5442E22B25FC521F00A26F43 /* SettingsViewController.swift */,
+				5442E22F25FC525200A26F43 /* TabBarViewController.swift */,
+			);
+			path = ViewControllers;
+			sourceTree = "<group>";
+		};
 		545DB9E121511E6300CA77B8 = {
 			isa = PBXGroup;
 			children = (
-				54B5113B216C40670033A6F3 /* FloatingPanel.framework */,
+				549D23CA233C7779008EF4D7 /* FloatingPanel.framework */,
 				545DB9EC21511E6300CA77B8 /* Sources */,
 				545DBA0121511E6400CA77B8 /* Tests */,
 				545DBA0C21511E6400CA77B8 /* UITests */,
 				545DB9EB21511E6300CA77B8 /* Products */,
-				545DBA1B2151CC1000CA77B8 /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -125,9 +171,13 @@
 				545DB9F621511E6400CA77B8 /* LaunchScreen.storyboard */,
 				545DB9F121511E6300CA77B8 /* Main.storyboard */,
 				545DB9ED21511E6300CA77B8 /* AppDelegate.swift */,
-				545DB9EF21511E6300CA77B8 /* ViewController.swift */,
-				54B51115216AFE5F0033A6F3 /* UIExtensions.swift */,
-				54CDC5D7215BBE23007D205C /* UIComponents.swift */,
+				545DB9EF21511E6300CA77B8 /* MainViewController.swift */,
+				54496C58263A7E5A0031E0C8 /* UseCaseController.swift */,
+				546341AA25C6421000CA0596 /* UseCases */,
+				5442E22225FC519700A26F43 /* ViewControllers */,
+				54EAD35A263A75EB006A36EA /* Layouts.swift */,
+				54B51115216AFE5F0033A6F3 /* Extensions.swift */,
+				54CDC5D7215BBE23007D205C /* Components.swift */,
 				545DB9F921511E6400CA77B8 /* Info.plist */,
 			);
 			path = Sources;
@@ -151,11 +201,14 @@
 			path = UITests;
 			sourceTree = "<group>";
 		};
-		545DBA1B2151CC1000CA77B8 /* Frameworks */ = {
+		546341AA25C6421000CA0596 /* UseCases */ = {
 			isa = PBXGroup;
 			children = (
+				546341A025C6415100CA0596 /* UseCase.swift */,
+				546341AB25C6426500CA0596 /* CustomState.swift */,
+				54EAD364263A765F006A36EA /* PagePanelController.swift */,
 			);
-			name = Frameworks;
+			path = UseCases;
 			sourceTree = "<group>";
 		};
 /* End PBXGroup section */
@@ -165,10 +218,11 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 545DBA1221511E6400CA77B8 /* Build configuration list for PBXNativeTarget "Samples" */;
 			buildPhases = (
+				54D7209621D4DB970054A255 /* ShellScript */,
 				545DB9E621511E6300CA77B8 /* Sources */,
 				545DB9E721511E6300CA77B8 /* Frameworks */,
 				545DB9E821511E6300CA77B8 /* Resources */,
-				54B5111C216C3B300033A6F3 /* Embed Frameworks */,
+				549D23CD233C7779008EF4D7 /* Embed Frameworks */,
 			);
 			buildRules = (
 			);
@@ -285,15 +339,50 @@
 		};
 /* End PBXResourcesBuildPhase section */
 
+/* Begin PBXShellScriptBuildPhase section */
+		54D7209621D4DB970054A255 /* ShellScript */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+			);
+			outputFileListPaths = (
+			);
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "/usr/libexec/PlistBuddy -c \"Set :CFBundleVersion $(git rev-parse --abbrev-ref HEAD)($(git rev-parse --short HEAD))\" \"$SRCROOT/$INFOPLIST_FILE\"\n";
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
 		545DB9E621511E6300CA77B8 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				54CDC5D8215BBE23007D205C /* UIComponents.swift in Sources */,
-				54B51116216AFE5F0033A6F3 /* UIExtensions.swift in Sources */,
-				545DB9F021511E6300CA77B8 /* ViewController.swift in Sources */,
+				5442E23425FC528400A26F43 /* DetailViewController.swift in Sources */,
+				54496C59263A7E5A0031E0C8 /* UseCaseController.swift in Sources */,
+				54CDC5D8215BBE23007D205C /* Components.swift in Sources */,
+				54B51116216AFE5F0033A6F3 /* Extensions.swift in Sources */,
+				5442E24A25FC53C100A26F43 /* DebugTextViewController.swift in Sources */,
+				546341AC25C6426500CA0596 /* CustomState.swift in Sources */,
+				5442E23A25FC52CD00A26F43 /* ModalViewController.swift in Sources */,
+				5442E22425FC51AF00A26F43 /* ImageViewController.swift in Sources */,
+				5442E24025FC533800A26F43 /* DebugTableViewController.swift in Sources */,
+				5442E25225FC541700A26F43 /* NestedScrollViewController.swift in Sources */,
+				5442E22825FC51E200A26F43 /* MultiPanelController.swift in Sources */,
+				546341A125C6415100CA0596 /* UseCase.swift in Sources */,
+				545DB9F021511E6300CA77B8 /* MainViewController.swift in Sources */,
 				545DB9EE21511E6300CA77B8 /* AppDelegate.swift in Sources */,
+				5442E23025FC525200A26F43 /* TabBarViewController.swift in Sources */,
+				54EAD35B263A75EB006A36EA /* Layouts.swift in Sources */,
+				54EAD365263A765F006A36EA /* PagePanelController.swift in Sources */,
+				5442E24425FC538200A26F43 /* InspectorViewController.swift in Sources */,
+				5442E22C25FC521F00A26F43 /* SettingsViewController.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -478,7 +567,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelSample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -497,7 +586,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelSample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;

Examples/Samples/Sources/AppDelegate.swift

@@ -1,7 +1,4 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import UIKit
 

Examples/Samples/Sources/Assets.xcassets/Contents.json

@@ -1,6 +1,6 @@
 {
   "info" : {
-    "version" : 1,
-    "author" : "xcode"
+    "author" : "xcode",
+    "version" : 1
   }
-}
+}

Examples/Samples/Sources/Assets.xcassets/IMG_0003.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "IMG_0003.jpg",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Examples/Samples/Sources/Base.lproj/Main.storyboard

@@ -1,21 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
-    <device id="retina4_7" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17701" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
     <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17703"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="Stack View standard spacing" minToolsVersion="9.0"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
         <!--Navigation Controller-->
         <scene sceneID="Cjh-iX-VQw">
             <objects>
-                <navigationController id="RoN-h0-uBD" sceneMemberID="viewController">
-                    <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="hNW-5m-Omi">
-                        <rect key="frame" x="0.0" y="20" width="375" height="44"/>
+                <navigationController storyboardIdentifier="RootNavigationController" id="RoN-h0-uBD" sceneMemberID="viewController">
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" largeTitles="YES" id="hNW-5m-Omi">
+                        <rect key="frame" x="0.0" y="44" width="375" height="96"/>
                         <autoresizingMask key="autoresizingMask"/>
                     </navigationBar>
                     <connections>
@@ -29,24 +27,24 @@
         <!--Samples-->
         <scene sceneID="35L-Gs-Vts">
             <objects>
-                <viewController id="jF4-A0-Eq6" customClass="SampleListViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController id="jF4-A0-Eq6" customClass="MainViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Smh-Bd-AAc">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="7IS-PU-x0P">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                                <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <prototypes>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="Cell" textLabel="M0G-C8-hAO" style="IBUITableViewCellStyleDefault" id="ySY-oA-g81">
-                                        <rect key="frame" x="0.0" y="28" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="28" width="600" height="43.5"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="ySY-oA-g81" id="sXB-nH-2g2">
-                                            <rect key="frame" x="0.0" y="0.0" width="375" height="43.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="600" height="43.5"/>
                                             <autoresizingMask key="autoresizingMask"/>
                                             <subviews>
                                                 <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" insetsLayoutMarginsFromSafeArea="NO" text="Title" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="M0G-C8-hAO">
-                                                    <rect key="frame" x="15" y="0.0" width="345" height="43.5"/>
+                                                    <rect key="frame" x="16" y="0.0" width="568" height="43.5"/>
                                                     <autoresizingMask key="autoresizingMask"/>
                                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                     <nil key="textColor"/>
@@ -58,16 +56,22 @@
                                 </prototypes>
                             </tableView>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="39L-Nq-qfp"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
                             <constraint firstItem="7IS-PU-x0P" firstAttribute="top" secondItem="Smh-Bd-AAc" secondAttribute="top" id="6yd-jv-ey3"/>
-                            <constraint firstItem="7IS-PU-x0P" firstAttribute="leading" secondItem="TkN-Oh-wF8" secondAttribute="leading" id="Z6Y-Dc-cei"/>
-                            <constraint firstItem="7IS-PU-x0P" firstAttribute="bottom" secondItem="TkN-Oh-wF8" secondAttribute="bottom" id="fNW-DP-lhV"/>
-                            <constraint firstItem="7IS-PU-x0P" firstAttribute="trailing" secondItem="TkN-Oh-wF8" secondAttribute="trailing" id="vfY-Rc-FOI"/>
+                            <constraint firstItem="7IS-PU-x0P" firstAttribute="leading" secondItem="39L-Nq-qfp" secondAttribute="leading" id="Z6Y-Dc-cei"/>
+                            <constraint firstItem="7IS-PU-x0P" firstAttribute="bottom" secondItem="Smh-Bd-AAc" secondAttribute="bottom" id="fNW-DP-lhV"/>
+                            <constraint firstItem="7IS-PU-x0P" firstAttribute="trailing" secondItem="39L-Nq-qfp" secondAttribute="trailing" id="vfY-Rc-FOI"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="TkN-Oh-wF8"/>
                     </view>
-                    <navigationItem key="navigationItem" title="Samples" id="wCF-su-7up"/>
+                    <navigationItem key="navigationItem" title="Samples" id="wCF-su-7up">
+                        <barButtonItem key="rightBarButtonItem" title="Settings" id="rbH-U3-XyA">
+                            <connections>
+                                <action selector="showDebugMenu:" destination="jF4-A0-Eq6" id="j02-db-ZM5"/>
+                            </connections>
+                        </barButtonItem>
+                    </navigationItem>
                     <connections>
                         <outlet property="tableView" destination="7IS-PU-x0P" id="YFM-9W-eP4"/>
                     </connections>
@@ -76,22 +80,106 @@
             </objects>
             <point key="canvasLocation" x="57" y="27"/>
         </scene>
-        <!--Item 2-->
+        <!--Settings View Controller-->
+        <scene sceneID="Bd0-D2-agO">
+            <objects>
+                <viewController storyboardIdentifier="SettingsViewController" id="C1X-9Z-TyQ" customClass="SettingsViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="af9-Zr-Ppc">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="197.33000000000001"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="n93-ZL-fmC">
+                                <rect key="frame" x="32" y="16" width="311" height="149.5"/>
+                                <subviews>
+                                    <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" alignment="center" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="DCi-Iv-o6d">
+                                        <rect key="frame" x="0.0" y="0.0" width="311" height="53"/>
+                                        <subviews>
+                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Version: 1.0" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WmC-Tq-NDN">
+                                                <rect key="frame" x="118.5" y="0.0" width="74.5" height="17.5"/>
+                                                <fontDescription key="fontDescription" type="system" pointSize="14"/>
+                                                <nil key="textColor"/>
+                                                <nil key="highlightedColor"/>
+                                            </label>
+                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="UINavigationBar" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Ulg-gS-ah0">
+                                                <rect key="frame" x="78.5" y="25.5" width="154.5" height="27.5"/>
+                                                <fontDescription key="fontDescription" style="UICTFontTextStyleTitle2"/>
+                                                <nil key="textColor"/>
+                                                <nil key="highlightedColor"/>
+                                            </label>
+                                        </subviews>
+                                    </stackView>
+                                    <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="J8j-7w-yCZ">
+                                        <rect key="frame" x="0.0" y="69" width="311" height="80.5"/>
+                                        <subviews>
+                                            <stackView opaque="NO" contentMode="scaleToFill" alignment="center" spacingType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="uEf-g4-CeU">
+                                                <rect key="frame" x="0.0" y="0.0" width="311" height="32"/>
+                                                <subviews>
+                                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Large Titles" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ogl-S5-4tJ">
+                                                        <rect key="frame" x="0.0" y="5.5" width="254" height="20.5"/>
+                                                        <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
+                                                        <nil key="textColor"/>
+                                                        <nil key="highlightedColor"/>
+                                                    </label>
+                                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="js8-Qv-lUC">
+                                                        <rect key="frame" x="262" y="0.5" width="51" height="31"/>
+                                                        <connections>
+                                                            <action selector="toggleLargeTitle:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="FJS-Ty-mCY"/>
+                                                        </connections>
+                                                    </switch>
+                                                </subviews>
+                                            </stackView>
+                                            <stackView opaque="NO" contentMode="scaleToFill" alignment="center" spacingType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="ZtZ-Dz-4cC">
+                                                <rect key="frame" x="0.0" y="48" width="311" height="32.5"/>
+                                                <subviews>
+                                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Translucent" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Z5i-rm-QgL">
+                                                        <rect key="frame" x="0.0" y="6" width="254" height="20.5"/>
+                                                        <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
+                                                        <nil key="textColor"/>
+                                                        <nil key="highlightedColor"/>
+                                                    </label>
+                                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="s6b-j9-8Kw">
+                                                        <rect key="frame" x="262" y="0.5" width="51" height="31"/>
+                                                        <connections>
+                                                            <action selector="toggleTranslucent:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="nL4-3L-9hh"/>
+                                                        </connections>
+                                                    </switch>
+                                                </subviews>
+                                            </stackView>
+                                        </subviews>
+                                    </stackView>
+                                </subviews>
+                            </stackView>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="0hr-ty-yWm"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <constraints>
+                            <constraint firstAttribute="bottom" secondItem="n93-ZL-fmC" secondAttribute="bottom" constant="32" id="2Ey-ou-E1M"/>
+                            <constraint firstAttribute="trailing" secondItem="n93-ZL-fmC" secondAttribute="trailing" constant="32" id="DdZ-eB-F5s"/>
+                            <constraint firstItem="n93-ZL-fmC" firstAttribute="leading" secondItem="af9-Zr-Ppc" secondAttribute="leading" constant="32" id="TyK-GP-Ari"/>
+                            <constraint firstItem="n93-ZL-fmC" firstAttribute="top" secondItem="af9-Zr-Ppc" secondAttribute="topMargin" constant="16" id="mbC-6H-z9M"/>
+                        </constraints>
+                    </view>
+                    <size key="freeformSize" width="375" height="197.33000000000001"/>
+                    <connections>
+                        <outlet property="largeTitlesSwicth" destination="js8-Qv-lUC" id="FOm-6k-ffi"/>
+                        <outlet property="translucentSwicth" destination="s6b-j9-8Kw" id="jmf-WH-bzZ"/>
+                        <outlet property="versionLabel" destination="WmC-Tq-NDN" id="Woh-kK-U0m"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="M9h-4V-3M0" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="708" y="-200"/>
+        </scene>
+        <!--Layout 2-->
         <scene sceneID="lRc-OZ-sL4">
             <objects>
                 <viewController id="RpE-lI-27a" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="JER-jz-KSq">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Item 2" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="AiP-dx-mFn">
-                                <rect key="frame" x="163.5" y="323" width="48" height="21"/>
-                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                <nil key="textColor"/>
-                                <nil key="highlightedColor"/>
-                            </label>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IvG-yp-yzI">
-                                <rect key="frame" x="20" y="20" width="39" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IvG-yp-yzI">
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="RpE-lI-27a" eventType="touchUpInside" id="hj3-Xv-6Gq"/>
@@ -99,37 +187,61 @@
                                 </connections>
                             </button>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="954-Dk-zvc"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
-                            <constraint firstItem="IvG-yp-yzI" firstAttribute="top" secondItem="2Cd-km-qEk" secondAttribute="top" id="18k-sV-PgT"/>
-                            <constraint firstItem="AiP-dx-mFn" firstAttribute="centerY" secondItem="JER-jz-KSq" secondAttribute="centerY" id="NUc-tM-0dN"/>
-                            <constraint firstItem="AiP-dx-mFn" firstAttribute="centerX" secondItem="JER-jz-KSq" secondAttribute="centerX" id="hwP-mu-Vmz"/>
-                            <constraint firstItem="IvG-yp-yzI" firstAttribute="leading" secondItem="2Cd-km-qEk" secondAttribute="leading" constant="20" id="pYt-jE-CTF"/>
+                            <constraint firstItem="IvG-yp-yzI" firstAttribute="top" secondItem="954-Dk-zvc" secondAttribute="top" id="18k-sV-PgT"/>
+                            <constraint firstItem="954-Dk-zvc" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="IvG-yp-yzI" secondAttribute="trailing" id="mpr-u5-MZu"/>
+                            <constraint firstItem="IvG-yp-yzI" firstAttribute="leading" secondItem="954-Dk-zvc" secondAttribute="leading" constant="20" id="pYt-jE-CTF"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="2Cd-km-qEk"/>
                     </view>
-                    <tabBarItem key="tabBarItem" tag="1" title="Item 2" id="qb3-RB-B28"/>
+                    <tabBarItem key="tabBarItem" tag="1" title="Layout 2" id="qb3-RB-B28"/>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="NhZ-u5-Beh" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="326" y="1575"/>
+            <point key="canvasLocation" x="-308" y="1546"/>
         </scene>
-        <!--Item 1-->
+        <!--Layout 3-->
+        <scene sceneID="r9h-Ql-gIv">
+            <objects>
+                <viewController id="pOk-Zm-vD9" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="85d-ub-G8k">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="NbG-e8-HdI">
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
+                                <state key="normal" title="Close"/>
+                                <connections>
+                                    <action selector="closeWithSender:" destination="pOk-Zm-vD9" eventType="touchUpInside" id="111-PD-Pop"/>
+                                    <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="1Rg-YG-TtU"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="0ao-SI-QZW"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <constraints>
+                            <constraint firstItem="0ao-SI-QZW" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="NbG-e8-HdI" secondAttribute="trailing" id="K9F-6x-KWn"/>
+                            <constraint firstItem="NbG-e8-HdI" firstAttribute="top" secondItem="0ao-SI-QZW" secondAttribute="top" id="nsE-so-rTl"/>
+                            <constraint firstItem="NbG-e8-HdI" firstAttribute="leading" secondItem="0ao-SI-QZW" secondAttribute="leading" constant="20" id="sF4-Dm-aoY"/>
+                        </constraints>
+                    </view>
+                    <tabBarItem key="tabBarItem" tag="2" title="Layout 3" id="RJD-TF-Sdh"/>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="Oe3-FT-q1C" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="332" y="1546"/>
+        </scene>
+        <!--Layout 1-->
         <scene sceneID="m6X-j6-yBM">
             <objects>
                 <viewController id="lto-Zc-Vtp" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="ji9-Ez-N7i">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Item 1" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="uoW-c8-9wx">
-                                <rect key="frame" x="164.5" y="323" width="46" height="21"/>
-                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                <nil key="textColor"/>
-                                <nil key="highlightedColor"/>
-                            </label>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eFN-tN-4Ct">
-                                <rect key="frame" x="20" y="20" width="39" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eFN-tN-4Ct">
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="YL4-GP-ZEZ"/>
@@ -137,20 +249,113 @@
                                 </connections>
                             </button>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="5Ns-4l-Ufg"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
-                            <constraint firstItem="eFN-tN-4Ct" firstAttribute="leading" secondItem="f88-U8-Vja" secondAttribute="leading" constant="20" id="5BT-yZ-EKe"/>
-                            <constraint firstItem="uoW-c8-9wx" firstAttribute="centerY" secondItem="ji9-Ez-N7i" secondAttribute="centerY" id="Nyw-Wt-78z"/>
-                            <constraint firstItem="eFN-tN-4Ct" firstAttribute="top" secondItem="f88-U8-Vja" secondAttribute="top" id="hUV-3a-XkY"/>
-                            <constraint firstItem="uoW-c8-9wx" firstAttribute="centerX" secondItem="ji9-Ez-N7i" secondAttribute="centerX" id="wDv-OH-7PX"/>
+                            <constraint firstItem="eFN-tN-4Ct" firstAttribute="leading" secondItem="5Ns-4l-Ufg" secondAttribute="leading" constant="20" id="5BT-yZ-EKe"/>
+                            <constraint firstItem="5Ns-4l-Ufg" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="eFN-tN-4Ct" secondAttribute="trailing" id="OzZ-Dz-RNF"/>
+                            <constraint firstItem="eFN-tN-4Ct" firstAttribute="top" secondItem="5Ns-4l-Ufg" secondAttribute="top" id="hUV-3a-XkY"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="f88-U8-Vja"/>
                     </view>
-                    <tabBarItem key="tabBarItem" title="Item 1" id="HEV-kf-jxH"/>
+                    <tabBarItem key="tabBarItem" title="Layout 1" id="HEV-kf-jxH"/>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="bkL-bc-hZC" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-380" y="1576"/>
+            <point key="canvasLocation" x="-962" y="1546"/>
+        </scene>
+        <!--Intrinsic View Controller-->
+        <scene sceneID="wtJ-qZ-aCl">
+            <objects>
+                <viewController storyboardIdentifier="IntrinsicViewController" title="Intrinsic View Controller" id="aK0-kv-mTu" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="eLM-xc-d9e">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="1000" verticalHuggingPriority="1000" horizontalCompressionResistancePriority="1000" verticalCompressionResistancePriority="1000" text="Change this text" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ge4-RW-Gmz">
+                                <rect key="frame" x="125.5" y="24" width="124" height="20.5"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="ouu-g9-OiX"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <constraints>
+                            <constraint firstItem="ge4-RW-Gmz" firstAttribute="top" secondItem="eLM-xc-d9e" secondAttribute="top" constant="24" id="j0s-fd-MYj"/>
+                            <constraint firstAttribute="bottom" relation="greaterThanOrEqual" secondItem="ge4-RW-Gmz" secondAttribute="bottom" constant="24" id="tEn-PO-nVD"/>
+                            <constraint firstItem="ge4-RW-Gmz" firstAttribute="centerX" secondItem="eLM-xc-d9e" secondAttribute="centerX" id="vh3-l7-uY8"/>
+                        </constraints>
+                    </view>
+                    <size key="freeformSize" width="375" height="778"/>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="DfE-fL-zy5" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="2753" y="734"/>
+        </scene>
+        <!--Image View Controller-->
+        <scene sceneID="NAI-Rh-ZQ6">
+            <objects>
+                <viewController storyboardIdentifier="ImageViewController" id="VWY-cF-RoY" customClass="ImageViewController" customModule="Samples" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="dAf-gD-ghB">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="Gs4-S6-Goh">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                                <subviews>
+                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="t7x-eG-MKh">
+                                        <rect key="frame" x="0.0" y="0.0" width="375" height="49"/>
+                                        <color key="backgroundColor" systemColor="systemOrangeColor"/>
+                                        <constraints>
+                                            <constraint firstAttribute="height" constant="49" id="DmG-pt-gij"/>
+                                        </constraints>
+                                    </view>
+                                    <scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" alwaysBounceHorizontal="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" translatesAutoresizingMaskIntoConstraints="NO" id="kRA-qy-GpJ">
+                                        <rect key="frame" x="0.0" y="49" width="375" height="680"/>
+                                        <subviews>
+                                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="1000" verticalHuggingPriority="1000" image="IMG_0003" translatesAutoresizingMaskIntoConstraints="NO" id="rGf-jW-WNf">
+                                                <rect key="frame" x="0.0" y="0.0" width="750" height="501"/>
+                                                <color key="backgroundColor" systemColor="systemPurpleColor"/>
+                                            </imageView>
+                                        </subviews>
+                                        <color key="backgroundColor" red="0.0078431372550000003" green="0.72156862749999995" blue="0.45882352939999999" alpha="1" colorSpace="calibratedRGB"/>
+                                        <constraints>
+                                            <constraint firstAttribute="trailing" secondItem="rGf-jW-WNf" secondAttribute="trailing" id="472-Be-cUl"/>
+                                            <constraint firstAttribute="bottom" secondItem="rGf-jW-WNf" secondAttribute="bottom" id="ncs-tN-3Wx"/>
+                                            <constraint firstItem="rGf-jW-WNf" firstAttribute="leading" secondItem="kRA-qy-GpJ" secondAttribute="leading" id="rlv-5Y-utR"/>
+                                            <constraint firstItem="rGf-jW-WNf" firstAttribute="top" secondItem="kRA-qy-GpJ" secondAttribute="top" id="zum-Zl-Wzz"/>
+                                        </constraints>
+                                    </scrollView>
+                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="SEa-7Y-wa9">
+                                        <rect key="frame" x="0.0" y="729" width="375" height="49"/>
+                                        <color key="backgroundColor" systemColor="systemTealColor"/>
+                                        <constraints>
+                                            <constraint firstAttribute="height" constant="49" id="3mS-zi-8BP"/>
+                                        </constraints>
+                                    </view>
+                                </subviews>
+                            </stackView>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="hCg-v5-nJs"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                        <constraints>
+                            <constraint firstAttribute="trailing" secondItem="Gs4-S6-Goh" secondAttribute="trailing" id="6z7-Md-pxr"/>
+                            <constraint firstAttribute="bottom" secondItem="Gs4-S6-Goh" secondAttribute="bottom" id="PcQ-bu-yT3"/>
+                            <constraint firstItem="Gs4-S6-Goh" firstAttribute="top" secondItem="dAf-gD-ghB" secondAttribute="top" id="zGx-Wd-hjz"/>
+                            <constraint firstItem="Gs4-S6-Goh" firstAttribute="leading" secondItem="dAf-gD-ghB" secondAttribute="leading" id="zxi-Ty-U7L"/>
+                        </constraints>
+                    </view>
+                    <size key="freeformSize" width="375" height="778"/>
+                    <connections>
+                        <outlet property="footerView" destination="SEa-7Y-wa9" id="Gzj-dP-YXl"/>
+                        <outlet property="headerView" destination="t7x-eG-MKh" id="njM-un-U8q"/>
+                        <outlet property="scrollView" destination="kRA-qy-GpJ" id="iWC-o4-APi"/>
+                        <outlet property="stackView" destination="Gs4-S6-Goh" id="f1D-bO-mjr"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="pnR-69-Ek4" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="3388" y="734.48275862068965"/>
         </scene>
         <!--Tab Bar View Controller-->
         <scene sceneID="nQ5-PV-qFw">
@@ -164,57 +369,65 @@
                     <connections>
                         <segue destination="lto-Zc-Vtp" kind="relationship" relationship="viewControllers" id="6hP-AH-YiH"/>
                         <segue destination="RpE-lI-27a" kind="relationship" relationship="viewControllers" id="g6X-Sq-uSW"/>
+                        <segue destination="pOk-Zm-vD9" kind="relationship" relationship="viewControllers" id="OPp-iO-iDK"/>
                     </connections>
                 </tabBarController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="Z9x-EI-p2b" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-183" y="806"/>
+            <point key="canvasLocation" x="-706" y="749"/>
         </scene>
         <!--Modal View Controller-->
         <scene sceneID="C9P-Ns-Qrq">
             <objects>
                 <viewController storyboardIdentifier="ModalViewController" id="bYI-y3-Rzb" customClass="ModalViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="qwo-GK-p1U">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="vut-mK-Y4t" customClass="SafeAreaView" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="0.0" y="667" width="375" height="0.0"/>
+                                <rect key="frame" x="0.0" y="758" width="375" height="0.0"/>
                                 <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                             </view>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sbF-Az-7sy">
-                                <rect key="frame" x="20" y="20" width="39" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sbF-Az-7sy">
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="MSC-ch-YJK"/>
                                 </connections>
                             </button>
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="top" spacing="44" translatesAutoresizingMaskIntoConstraints="NO" id="9p4-06-y2T">
-                                <rect key="frame" x="139.5" y="108" width="96" height="252"/>
+                                <rect key="frame" x="134.5" y="88" width="106" height="326"/>
                                 <subviews>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="i9x-x5-n1q">
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="i9x-x5-n1q">
                                         <rect key="frame" x="0.0" y="0.0" width="80" height="30"/>
                                         <state key="normal" title="Move to full"/>
                                         <connections>
                                             <action selector="moveToFullWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="TDe-3J-gIR"/>
                                         </connections>
                                     </button>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="2u5-cH-RAN">
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="2u5-cH-RAN">
                                         <rect key="frame" x="0.0" y="74" width="85" height="30"/>
                                         <state key="normal" title="Move to half"/>
                                         <connections>
                                             <action selector="moveToHalfWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="12s-o7-Et5"/>
                                         </connections>
                                     </button>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="M4A-iO-RIE">
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="M4A-iO-RIE">
                                         <rect key="frame" x="0.0" y="148" width="77" height="30"/>
                                         <state key="normal" title="Move to tip"/>
                                         <connections>
                                             <action selector="moveToTipWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="BmL-91-9ai"/>
                                         </connections>
                                     </button>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="szf-HE-QTk">
-                                        <rect key="frame" x="0.0" y="222" width="96" height="30"/>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="swr-XM-GzZ">
+                                        <rect key="frame" x="0.0" y="222" width="106" height="30"/>
+                                        <state key="normal" title="Move to hidden"/>
+                                        <connections>
+                                            <action selector="moveToHiddenWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="jfJ-0f-fdk"/>
+                                        </connections>
+                                    </button>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="szf-HE-QTk">
+                                        <rect key="frame" x="0.0" y="296" width="96" height="30"/>
                                         <state key="normal" title="Update layout"/>
                                         <connections>
                                             <action selector="updateLayout:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="Woz-a7-YMJ"/>
@@ -223,37 +436,38 @@
                                 </subviews>
                             </stackView>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="kjr-TP-fcM"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
-                            <constraint firstItem="sbF-Az-7sy" firstAttribute="top" secondItem="GBa-yx-8to" secondAttribute="top" id="3VR-hj-zeQ"/>
-                            <constraint firstItem="9p4-06-y2T" firstAttribute="top" secondItem="GBa-yx-8to" secondAttribute="top" constant="88" id="41n-Fn-hi3"/>
+                            <constraint firstItem="sbF-Az-7sy" firstAttribute="top" secondItem="kjr-TP-fcM" secondAttribute="top" id="3VR-hj-zeQ"/>
+                            <constraint firstItem="9p4-06-y2T" firstAttribute="top" secondItem="kjr-TP-fcM" secondAttribute="top" constant="88" id="41n-Fn-hi3"/>
                             <constraint firstAttribute="bottom" secondItem="vut-mK-Y4t" secondAttribute="bottom" id="6eq-Kt-heZ"/>
-                            <constraint firstItem="sbF-Az-7sy" firstAttribute="leading" secondItem="GBa-yx-8to" secondAttribute="leading" constant="20" id="T2G-1L-PRs"/>
-                            <constraint firstItem="vut-mK-Y4t" firstAttribute="leading" secondItem="qwo-GK-p1U" secondAttribute="leading" id="gVC-jv-VJX"/>
-                            <constraint firstItem="vut-mK-Y4t" firstAttribute="trailing" secondItem="GBa-yx-8to" secondAttribute="trailing" id="jkq-p2-lUm"/>
-                            <constraint firstItem="9p4-06-y2T" firstAttribute="centerX" secondItem="qwo-GK-p1U" secondAttribute="centerX" id="l8t-p3-ETf"/>
-                            <constraint firstItem="vut-mK-Y4t" firstAttribute="top" secondItem="GBa-yx-8to" secondAttribute="bottom" id="rMy-JT-t4B"/>
+                            <constraint firstItem="sbF-Az-7sy" firstAttribute="leading" secondItem="kjr-TP-fcM" secondAttribute="leading" constant="20" id="T2G-1L-PRs"/>
+                            <constraint firstItem="vut-mK-Y4t" firstAttribute="leading" secondItem="kjr-TP-fcM" secondAttribute="leading" id="gVC-jv-VJX"/>
+                            <constraint firstItem="vut-mK-Y4t" firstAttribute="trailing" secondItem="kjr-TP-fcM" secondAttribute="trailing" id="jkq-p2-lUm"/>
+                            <constraint firstItem="9p4-06-y2T" firstAttribute="centerX" secondItem="kjr-TP-fcM" secondAttribute="centerX" id="l8t-p3-ETf"/>
+                            <constraint firstItem="vut-mK-Y4t" firstAttribute="top" secondItem="kjr-TP-fcM" secondAttribute="bottom" id="rMy-JT-t4B"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="GBa-yx-8to"/>
                     </view>
+                    <size key="freeformSize" width="375" height="778"/>
                     <connections>
                         <outlet property="safeAreaView" destination="vut-mK-Y4t" id="r9P-XF-wLd"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="fbi-LZ-M4Y" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="561" y="806"/>
+            <point key="canvasLocation" x="1375" y="734"/>
         </scene>
         <!--Nested Scroll View Controller-->
         <scene sceneID="TfC-A3-4R0">
             <objects>
                 <viewController storyboardIdentifier="NestedScrollViewController" id="LAe-jm-k6f" customClass="NestedScrollViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="414-Wy-0t1">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="sBe-tN-uMi">
-                                <rect key="frame" x="0.0" y="32" width="375" height="635"/>
+                                <rect key="frame" x="0.0" y="32" width="375" height="746"/>
                                 <subviews>
                                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="lFR-Sp-Sj1">
                                         <rect key="frame" x="0.0" y="0.0" width="375" height="968"/>
@@ -326,23 +540,24 @@
                                 </constraints>
                             </scrollView>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="ufS-Rf-F2F"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <gestureRecognizers/>
                         <constraints>
-                            <constraint firstItem="sBe-tN-uMi" firstAttribute="leading" secondItem="414-Wy-0t1" secondAttribute="leading" id="8Qd-my-knA"/>
+                            <constraint firstItem="sBe-tN-uMi" firstAttribute="leading" secondItem="ufS-Rf-F2F" secondAttribute="leading" id="8Qd-my-knA"/>
                             <constraint firstItem="sBe-tN-uMi" firstAttribute="top" secondItem="414-Wy-0t1" secondAttribute="top" constant="32" id="9Js-LU-lNr"/>
                             <constraint firstAttribute="bottom" secondItem="sBe-tN-uMi" secondAttribute="bottom" id="jzB-47-P7e"/>
-                            <constraint firstAttribute="trailing" secondItem="sBe-tN-uMi" secondAttribute="trailing" id="nHG-wg-pLP"/>
+                            <constraint firstItem="ufS-Rf-F2F" firstAttribute="trailing" secondItem="sBe-tN-uMi" secondAttribute="trailing" id="nHG-wg-pLP"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="sL5-d5-za2"/>
                         <connections>
                             <outletCollection property="gestureRecognizers" destination="tOa-bf-zGz" appends="YES" id="zle-Sz-M3U"/>
                             <outletCollection property="gestureRecognizers" destination="SCk-hG-weZ" appends="YES" id="OcK-FK-Lac"/>
                             <outletCollection property="gestureRecognizers" destination="Fvp-Z6-eVc" appends="YES" id="Fds-J5-YCg"/>
                         </connections>
                     </view>
-                    <size key="freeformSize" width="375" height="667"/>
+                    <size key="freeformSize" width="375" height="778"/>
                     <connections>
+                        <outlet property="nestedScrollView" destination="xba-kG-VQ2" id="ddV-kf-37A"/>
                         <outlet property="scrollView" destination="sBe-tN-uMi" id="h4S-Zl-cLO"/>
                     </connections>
                 </viewController>
@@ -363,7 +578,7 @@
                     </connections>
                 </swipeGestureRecognizer>
             </objects>
-            <point key="canvasLocation" x="1311" y="806"/>
+            <point key="canvasLocation" x="2097" y="734"/>
         </scene>
         <!--Detail View Controller-->
         <scene sceneID="b6k-zi-3wn">
@@ -373,8 +588,19 @@
                         <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="noi-1a-5bZ" customClass="CloseButton" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="319" y="12" width="44" height="44"/>
+                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="8yw-OC-Ubk">
+                                <rect key="frame" x="0.0" y="690" width="375" height="88"/>
+                                <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="88" id="jwV-YU-tXG"/>
+                                </constraints>
+                            </view>
+                            <view alpha="0.5" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Kva-Z7-0qY" customClass="OnSafeAreaView" customModule="Samples" customModuleProvider="target">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                                <color key="backgroundColor" red="0.0078431372550000003" green="0.72156862749999995" blue="0.45882352939999999" alpha="1" colorSpace="calibratedRGB"/>
+                            </view>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="noi-1a-5bZ" customClass="CloseButton" customModule="Samples" customModuleProvider="target">
+                                <rect key="frame" x="319" y="0.0" width="44" height="44"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="44" id="0jg-5D-A1F"/>
                                     <constraint firstAttribute="width" constant="44" id="1Cq-PA-wgW"/>
@@ -383,31 +609,34 @@
                                     <action selector="closeWithSender:" destination="YC8-ae-15L" eventType="touchUpInside" id="Z2v-19-S5k"/>
                                 </connections>
                             </button>
-                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="8yw-OC-Ubk">
-                                <rect key="frame" x="0.0" y="690" width="375" height="88"/>
-                                <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
-                                <constraints>
-                                    <constraint firstAttribute="height" constant="88" id="jwV-YU-tXG"/>
-                                </constraints>
-                            </view>
-                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Kva-Z7-0qY" customClass="OnSafeAreaView" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="0.0" y="734" width="375" height="44"/>
-                                <color key="backgroundColor" red="0.0078431372550000003" green="0.72156862749999995" blue="0.45882352939999999" alpha="1" colorSpace="calibratedRGB"/>
-                                <constraints>
-                                    <constraint firstAttribute="height" constant="44" id="DQJ-cY-cKx"/>
-                                </constraints>
-                            </view>
-                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="22" translatesAutoresizingMaskIntoConstraints="NO" id="tP3-oJ-4EB">
-                                <rect key="frame" x="130.5" y="108" width="114" height="82"/>
+                            <stackView opaque="NO" contentMode="scaleToFill" distribution="fillProportionally" alignment="center" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="qux-uG-4o2">
+                                <rect key="frame" x="8" y="8" width="148" height="31"/>
                                 <subviews>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="c5r-jU-haj">
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="fitToBounds" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7lq-d3-PKi">
+                                        <rect key="frame" x="0.0" y="5.5" width="91" height="20.5"/>
+                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                        <nil key="textColor"/>
+                                        <nil key="highlightedColor"/>
+                                    </label>
+                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="0MA-lV-KjS">
+                                        <rect key="frame" x="99" y="0.0" width="51" height="31"/>
+                                        <connections>
+                                            <action selector="modeChanged:" destination="YC8-ae-15L" eventType="valueChanged" id="IQ8-u2-Rib"/>
+                                        </connections>
+                                    </switch>
+                                </subviews>
+                            </stackView>
+                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="22" translatesAutoresizingMaskIntoConstraints="NO" id="tP3-oJ-4EB">
+                                <rect key="frame" x="130.5" y="88" width="114" height="134"/>
+                                <subviews>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="c5r-jU-haj">
                                         <rect key="frame" x="0.0" y="0.0" width="114" height="30"/>
                                         <state key="normal" title="Show"/>
                                         <connections>
                                             <action selector="buttonPressed:" destination="YC8-ae-15L" eventType="touchUpInside" id="Mi1-o6-TWt"/>
                                         </connections>
                                     </button>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="wmd-ab-Nz3">
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="wmd-ab-Nz3">
                                         <rect key="frame" x="0.0" y="52" width="114" height="30"/>
                                         <state key="normal" title="Present Modallly"/>
                                         <connections>
@@ -415,24 +644,35 @@
                                             <segue destination="bYI-y3-Rzb" kind="presentation" identifier="PresentModallySegue" id="3yq-HE-Tgn"/>
                                         </connections>
                                     </button>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="01L-lp-oy6">
+                                        <rect key="frame" x="0.0" y="104" width="114" height="30"/>
+                                        <state key="normal" title="Update Layout"/>
+                                        <connections>
+                                            <action selector="buttonPressed:" destination="YC8-ae-15L" eventType="touchUpInside" id="zTb-sq-B6f"/>
+                                        </connections>
+                                    </button>
                                 </subviews>
                             </stackView>
                         </subviews>
-                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <viewLayoutGuide key="safeArea" id="aOK-7l-cA6"/>
+                        <color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <gestureRecognizers/>
                         <constraints>
-                            <constraint firstItem="noi-1a-5bZ" firstAttribute="top" secondItem="g7l-kO-y7q" secondAttribute="top" constant="12" id="EQy-cr-F2Y"/>
-                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="centerX" secondItem="g7l-kO-y7q" secondAttribute="centerX" id="EsD-Vf-dNZ"/>
+                            <constraint firstItem="noi-1a-5bZ" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" id="EQy-cr-F2Y"/>
+                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="centerX" secondItem="aOK-7l-cA6" secondAttribute="centerX" id="EsD-Vf-dNZ"/>
+                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" id="Fff-HL-4mo"/>
                             <constraint firstItem="8yw-OC-Ubk" firstAttribute="bottom" secondItem="g7l-kO-y7q" secondAttribute="bottom" id="JOL-wC-w74"/>
-                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="leading" secondItem="tAi-nk-rDB" secondAttribute="leading" id="RiJ-Hb-OOZ"/>
-                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="trailing" secondItem="tAi-nk-rDB" secondAttribute="trailing" id="Sof-yL-mwK"/>
-                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="top" secondItem="tAi-nk-rDB" secondAttribute="top" constant="88" id="Zhb-Ss-epe"/>
-                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="trailing" secondItem="tAi-nk-rDB" secondAttribute="trailing" id="kkp-Yo-FQW"/>
-                            <constraint firstItem="tAi-nk-rDB" firstAttribute="trailing" secondItem="noi-1a-5bZ" secondAttribute="trailing" constant="12" id="lv9-Nf-HNB"/>
-                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="leading" secondItem="tAi-nk-rDB" secondAttribute="leading" id="oVC-i1-TwS"/>
-                            <constraint firstItem="tAi-nk-rDB" firstAttribute="bottom" secondItem="Kva-Z7-0qY" secondAttribute="bottom" id="rW2-mF-5DR"/>
+                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="leading" secondItem="aOK-7l-cA6" secondAttribute="leading" id="RiJ-Hb-OOZ"/>
+                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="trailing" secondItem="aOK-7l-cA6" secondAttribute="trailing" id="Sof-yL-mwK"/>
+                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="top" secondItem="g7l-kO-y7q" secondAttribute="top" constant="88" id="Zhb-Ss-epe"/>
+                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="trailing" secondItem="aOK-7l-cA6" secondAttribute="trailing" id="kkp-Yo-FQW"/>
+                            <constraint firstItem="aOK-7l-cA6" firstAttribute="trailing" secondItem="noi-1a-5bZ" secondAttribute="trailing" constant="12" id="lv9-Nf-HNB"/>
+                            <constraint firstItem="qux-uG-4o2" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" constant="8" id="naa-cf-ZIc"/>
+                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="leading" secondItem="aOK-7l-cA6" secondAttribute="leading" id="oVC-i1-TwS"/>
+                            <constraint firstItem="aOK-7l-cA6" firstAttribute="bottom" secondItem="Kva-Z7-0qY" secondAttribute="bottom" id="rW2-mF-5DR"/>
+                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="top" relation="greaterThanOrEqual" secondItem="tP3-oJ-4EB" secondAttribute="bottom" constant="88" id="vKQ-h9-uKt"/>
+                            <constraint firstItem="qux-uG-4o2" firstAttribute="leading" secondItem="g7l-kO-y7q" secondAttribute="leading" constant="8" id="zXb-R9-bMO"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="tAi-nk-rDB"/>
                         <connections>
                             <outletCollection property="gestureRecognizers" destination="6Ca-p8-7uF" appends="YES" id="xOy-f1-NZE"/>
                             <outletCollection property="gestureRecognizers" destination="SPY-Vr-XDT" appends="YES" id="vgS-Am-jhQ"/>
@@ -442,6 +682,8 @@
                     <size key="freeformSize" width="375" height="778"/>
                     <connections>
                         <outlet property="closeButton" destination="noi-1a-5bZ" id="eWQ-ha-8y7"/>
+                        <outlet property="intrinsicHeightConstraint" destination="vKQ-h9-uKt" id="QpA-WD-b17"/>
+                        <outlet property="modeChangeView" destination="qux-uG-4o2" id="1Nq-fE-dXw"/>
                         <segue destination="bYI-y3-Rzb" kind="show" identifier="ShowSegue" id="r1P-2i-NDe"/>
                     </connections>
                 </viewController>
@@ -462,7 +704,7 @@
                     </connections>
                 </pongPressGestureRecognizer>
             </objects>
-            <point key="canvasLocation" x="1440.8" y="-23.388305847076463"/>
+            <point key="canvasLocation" x="653.60000000000002" y="733.74384236453204"/>
         </scene>
         <!--Debug Text View Controller-->
         <scene sceneID="Bkq-O7-q4A">
@@ -518,26 +760,43 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
                                 <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
                             </textView>
                         </subviews>
+                        <viewLayoutGuide key="safeArea" id="5ET-zC-lCb"/>
                         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
-                            <constraint firstItem="rN1-HL-YHv" firstAttribute="leading" secondItem="ix0-2W-gQN" secondAttribute="leading" id="7V3-KL-vXd"/>
+                            <constraint firstItem="rN1-HL-YHv" firstAttribute="leading" secondItem="5ET-zC-lCb" secondAttribute="leading" id="7V3-KL-vXd"/>
                             <constraint firstAttribute="bottom" secondItem="rN1-HL-YHv" secondAttribute="bottom" id="efD-U5-Tet"/>
                             <constraint firstItem="rN1-HL-YHv" firstAttribute="top" secondItem="9YG-0j-Zzg" secondAttribute="top" constant="17" id="fiO-LL-nSC"/>
-                            <constraint firstItem="rN1-HL-YHv" firstAttribute="trailing" secondItem="ix0-2W-gQN" secondAttribute="trailing" id="lfg-EE-euw"/>
+                            <constraint firstItem="rN1-HL-YHv" firstAttribute="trailing" secondItem="5ET-zC-lCb" secondAttribute="trailing" id="lfg-EE-euw"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="ix0-2W-gQN"/>
                     </view>
                     <size key="freeformSize" width="375" height="778"/>
                     <connections>
                         <outlet property="textView" destination="rN1-HL-YHv" id="gmr-Uf-jd8"/>
+                        <outlet property="textViewTopConstraint" destination="fiO-LL-nSC" id="Rum-TN-c2e"/>
+                        <outlet property="view" destination="9YG-0j-Zzg" id="jhb-eT-nEn"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="x1h-y1-h8q" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="729" y="-23"/>
+            <point key="canvasLocation" x="-1" y="734"/>
         </scene>
     </scenes>
     <inferredMetricsTieBreakers>
-        <segue reference="3yq-HE-Tgn"/>
+        <segue reference="r1P-2i-NDe"/>
     </inferredMetricsTieBreakers>
+    <resources>
+        <image name="IMG_0003" width="750" height="501"/>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+        <systemColor name="systemOrangeColor">
+            <color red="1" green="0.58431372549019611" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        </systemColor>
+        <systemColor name="systemPurpleColor">
+            <color red="0.68627450980392157" green="0.32156862745098042" blue="0.87058823529411766" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        </systemColor>
+        <systemColor name="systemTealColor">
+            <color red="0.35294117647058826" green="0.78431372549019607" blue="0.98039215686274506" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        </systemColor>
+    </resources>
 </document>

Examples/Samples/Sources/Components.swift

@@ -1,12 +1,9 @@
-//
-//  Created by Shin Yamamoto on 2018/09/19.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import UIKit
 
 @IBDesignable
-class CloseButton: UIButton {
+final class CloseButton: UIButton {
     required init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
         render()
@@ -74,7 +71,7 @@ class CloseButton: UIButton {
 }
 
 @IBDesignable
-class SafeAreaView: UIView {
+final class SafeAreaView: UIView {
     override func prepareForInterfaceBuilder() {
         let label = UILabel()
         label.text = "Safe Area"
@@ -89,7 +86,7 @@ class SafeAreaView: UIView {
 
 
 @IBDesignable
-class OnSafeAreaView: UIView {
+final class OnSafeAreaView: UIView {
     override func prepareForInterfaceBuilder() {
         let label = UILabel()
         label.text = "On Safe Area"

Examples/Samples/Sources/Extensions.swift

@@ -0,0 +1,40 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+protocol LayoutGuideProvider {
+    var topAnchor: NSLayoutYAxisAnchor { get }
+    var bottomAnchor: NSLayoutYAxisAnchor { get }
+}
+extension UILayoutGuide: LayoutGuideProvider {}
+
+class CustomLayoutGuide: LayoutGuideProvider {
+    let topAnchor: NSLayoutYAxisAnchor
+    let bottomAnchor: NSLayoutYAxisAnchor
+    init(topAnchor: NSLayoutYAxisAnchor, bottomAnchor: NSLayoutYAxisAnchor) {
+        self.topAnchor = topAnchor
+        self.bottomAnchor = bottomAnchor
+    }
+}
+
+extension UIViewController {
+    var layoutInsets: UIEdgeInsets {
+        if #available(iOS 11.0, *) {
+            return view.safeAreaInsets
+        } else {
+            return UIEdgeInsets(top: topLayoutGuide.length,
+                                left: 0.0,
+                                bottom: bottomLayoutGuide.length,
+                                right: 0.0)
+        }
+    }
+
+    var layoutGuide: LayoutGuideProvider {
+        if #available(iOS 11.0, *) {
+            return view!.safeAreaLayoutGuide
+        } else {
+            return CustomLayoutGuide(topAnchor: topLayoutGuide.bottomAnchor,
+                                     bottomAnchor: bottomLayoutGuide.topAnchor)
+        }
+    }
+}

Examples/Samples/Sources/Layouts.swift

@@ -0,0 +1,90 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+/**
+ - Attention: `FloatingPanelLayout` must not be applied by the parent view
+ controller of a panel. But here `MainViewController` adopts it
+ purposely to check if the library prints an appropriate warning.
+ */
+extension MainViewController: FloatingPanelLayout {
+    var position: FloatingPanelPosition { .bottom }
+    var initialState: FloatingPanelState { .half }
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 262.0, edge: .bottom, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class TopPositionedPanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .top
+    let initialState: FloatingPanelState = .full
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 88.0, edge: .bottom, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .top, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class IntrinsicPanelLayout: FloatingPanelBottomLayout {
+    override var initialState: FloatingPanelState { .full }
+    override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class RemovablePanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .half
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 130.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+}
+
+class RemovablePanelLandscapeLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .full
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+}
+
+class ModalPanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .full
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+}

Examples/Samples/Sources/MainViewController.swift

@@ -0,0 +1,93 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class MainViewController: UIViewController {
+    @IBOutlet weak var tableView: UITableView!
+    private var observations: [NSKeyValueObservation] = []
+
+    private lazy var useCaseController = UseCaseController(mainVC: self)
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        tableView.dataSource = self
+        tableView.delegate = self
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
+        automaticallyAdjustsScrollViewInsets = false
+
+        let searchController = UISearchController(searchResultsController: nil)
+        if #available(iOS 11.0, *) {
+            navigationItem.searchController = searchController
+            navigationItem.hidesSearchBarWhenScrolling = false
+            navigationItem.largeTitleDisplayMode = .automatic
+        } else {
+            // Fallback on earlier versions
+        }
+        var insets = UIEdgeInsets.zero
+        insets.bottom += 69.0
+        tableView.contentInset = insets
+
+        // Show the initial panel
+        useCaseController.set(useCase: .trackingTableView)
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        if #available(iOS 11.0, *) {
+            if let observation = navigationController?.navigationBar.observe(\.prefersLargeTitles, changeHandler: { (bar, _) in
+                self.tableView.reloadData()
+            }) {
+                observations.append(observation)
+            }
+        }
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        observations.removeAll()
+    }
+
+    // MARK:- Actions
+    @IBAction func showDebugMenu(_ sender: UIBarButtonItem) {
+        useCaseController.setUpSettingsPanel(for: self)
+    }
+}
+
+extension MainViewController: UITableViewDataSource {
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        if #available(iOS 11.0, *) {
+            if navigationController?.navigationBar.prefersLargeTitles == true {
+                return UseCase.allCases.count + 30
+            } else {
+                return UseCase.allCases.count
+            }
+        } else {
+            return UseCase.allCases.count
+        }
+    }
+
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        if UseCase.allCases.count > indexPath.row {
+            let menu = UseCase.allCases[indexPath.row]
+            cell.textLabel?.text = menu.name
+        } else {
+            cell.textLabel?.text = "\(indexPath.row) row"
+        }
+        return cell
+    }
+}
+
+extension MainViewController: UITableViewDelegate {
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        guard UseCase.allCases.count > indexPath.row else { return }
+
+        // Change panels
+        useCaseController.set(useCase: UseCase.allCases[indexPath.row])
+    }
+
+    @objc func dismissPresentedVC() {
+        self.presentedViewController?.dismiss(animated: true, completion: nil)
+    }
+}

Examples/Samples/Sources/UIExtensions.swift

@@ -1,25 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/10/08.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-extension UIView {
-    var layoutInsets: UIEdgeInsets {
-        if #available(iOS 11.0, *) {
-            return safeAreaInsets
-        } else {
-            return layoutMargins
-        }
-    }
-
-    var layoutGuide: UILayoutGuide {
-        if #available(iOS 11.0, *) {
-            return safeAreaLayoutGuide
-        } else {
-            return layoutMarginsGuide
-        }
-    }
-}
-

Examples/Samples/Sources/UseCaseController.swift

@@ -0,0 +1,329 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class UseCaseController: NSObject {
+    unowned let mainVC: MainViewController
+    private(set) var useCase: UseCase = .trackingTableView
+
+    fileprivate var mainPanelVC: FloatingPanelController!
+    private var detailPanelVC: FloatingPanelController!
+    private var settingsPanelVC: FloatingPanelController!
+
+    private lazy var pagePanelController = PagePanelController()
+
+    private var mainPanelObserves: [NSKeyValueObservation] = []
+
+    init(mainVC: MainViewController) {
+        self.mainVC = mainVC
+    }
+
+    func set(useCase: UseCase) {
+        self.useCase = useCase
+
+        let contentVC = useCase.makeContentViewController(with: mainVC.storyboard!)
+
+        detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
+        detailPanelVC = nil
+
+        switch useCase {
+        case .showDetail:
+            detailPanelVC?.removePanelFromParent(animated: false)
+
+            // Initialize FloatingPanelController
+            detailPanelVC = FloatingPanelController()
+            detailPanelVC.delegate = self
+
+            let appearance = SurfaceAppearance()
+            appearance.cornerRadius = 6.0
+            detailPanelVC.surfaceView.appearance = appearance
+
+            // Set a content view controller
+            detailPanelVC.set(contentViewController: contentVC)
+
+            detailPanelVC.contentMode = .fitToBounds
+            (contentVC as? DetailViewController)?.intrinsicHeightConstraint.isActive = false
+
+            //  Add FloatingPanel to self.view
+            detailPanelVC.addPanel(toParent: mainVC, animated: true)
+        case .showModal, .showTabBar:
+            let modalVC = contentVC
+            modalVC.modalPresentationStyle = .fullScreen
+            mainVC.present(modalVC, animated: true, completion: nil)
+
+        case .showPageView:
+            let pageVC = pagePanelController.makePageViewController(for: mainVC)
+            mainVC.present(pageVC, animated: true, completion: nil)
+
+        case .showPageContentView:
+            let pageVC = pagePanelController.makePageViewControllerForContent()
+            self.addMainPanel(with: pageVC)
+        case .showPanelModal:
+            let fpc = FloatingPanelController()
+            let contentVC = mainVC.storyboard!.instantiateViewController(withIdentifier: "DetailViewController")
+            contentVC.loadViewIfNeeded()
+            (contentVC as? DetailViewController)?.modeChangeView.isHidden = true
+            fpc.set(contentViewController: contentVC)
+            fpc.delegate = self
+
+            let appearance = SurfaceAppearance()
+            appearance.cornerRadius = 38.5
+            fpc.surfaceView.appearance = appearance
+            fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+
+            fpc.isRemovalInteractionEnabled = true
+
+            mainVC.present(fpc, animated: true, completion: nil)
+
+        case .showMultiPanelModal:
+            let fpc = MultiPanelController()
+            mainVC.present(fpc, animated: true, completion: nil)
+
+        case .showPanelInSheetModal:
+            let fpc = FloatingPanelController()
+            let contentVC = UIViewController()
+            fpc.set(contentViewController: contentVC)
+            fpc.delegate = self
+
+            let apprearance = SurfaceAppearance()
+            apprearance.cornerRadius = 38.5
+            apprearance.shadows = []
+            fpc.surfaceView.appearance = apprearance
+            fpc.isRemovalInteractionEnabled = true
+
+            let mvc = UIViewController()
+            mvc.view.backgroundColor = UIColor(displayP3Red: 2/255, green: 184/255, blue: 117/255, alpha: 1.0)
+            fpc.addPanel(toParent: mvc)
+            mainVC.present(mvc, animated: true, completion: nil)
+        case .showContentInset:
+            let contentViewController = UIViewController()
+            contentViewController.view.backgroundColor = .green
+
+            let fpc = FloatingPanelController()
+            fpc.set(contentViewController: contentViewController)
+            fpc.surfaceView.contentPadding = .init(top: 20, left: 20, bottom: 20, right: 20)
+
+            fpc.delegate = self
+            fpc.isRemovalInteractionEnabled = true
+            mainVC.present(fpc, animated: true, completion: nil)
+
+        case .showContainerMargins:
+            let fpc = FloatingPanelController()
+
+            let appearance = SurfaceAppearance()
+            appearance.cornerRadius = 38.5
+            fpc.surfaceView.appearance = appearance
+
+            fpc.surfaceView.backgroundColor = .red
+            fpc.surfaceView.containerMargins = .init(top: 24.0, left: 8.0, bottom: max(mainVC.layoutInsets.bottom, 8.0), right: 8.0)
+            #if swift(>=5.1) // Actually Xcode 11 or later
+            if #available(iOS 13.0, *) {
+                fpc.surfaceView.layer.cornerCurve = .continuous
+            }
+            #endif
+
+            fpc.delegate = self
+            fpc.isRemovalInteractionEnabled = true
+            mainVC.present(fpc, animated: true, completion: nil)
+        default:
+            self.addMainPanel(with: contentVC)
+        }
+    }
+
+    private func addMainPanel(with contentVC: UIViewController) {
+        mainPanelObserves.removeAll()
+
+        let oldMainPanelVC = mainPanelVC
+
+        mainPanelVC = FloatingPanelController()
+        mainPanelVC.delegate = self
+        mainPanelVC.contentInsetAdjustmentBehavior = .always
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        mainPanelVC.surfaceView.appearance = appearance
+
+        set(contentViewController: contentVC)
+
+        useCase.setUpInteraction(for: self)
+
+        //  Add FloatingPanel to self.view
+        if let oldMainPanelVC = oldMainPanelVC {
+            oldMainPanelVC.removePanelFromParent(animated: true, completion: {
+                self.mainPanelVC.addPanel(toParent: self.mainVC, animated: true)
+            })
+        } else {
+            mainPanelVC.addPanel(toParent: mainVC, animated: true)
+        }
+    }
+
+    private func set(contentViewController contentVC: UIViewController) {
+        mainPanelVC.set(contentViewController: contentVC)
+        // Track a scroll view
+        switch contentVC {
+        case let consoleVC as DebugTextViewController:
+            mainPanelVC.track(scrollView: consoleVC.textView)
+
+        case let contentVC as DebugTableViewController:
+            let ob = contentVC.tableView.observe(\.isEditing) { (tableView, _) in
+                self.mainPanelVC.panGestureRecognizer.isEnabled = !tableView.isEditing
+            }
+            mainPanelObserves.append(ob)
+            mainPanelVC.track(scrollView: contentVC.tableView)
+        case let contentVC as NestedScrollViewController:
+            mainPanelVC.track(scrollView: contentVC.scrollView)
+        case let navVC as UINavigationController:
+            if let rootVC = (navVC.topViewController as? MainViewController) {
+                rootVC.loadViewIfNeeded()
+                mainPanelVC.track(scrollView: rootVC.tableView)
+            }
+        case let contentVC as ImageViewController:
+            if #available(iOS 11.0, *) {
+                let mode: ImageViewController.Mode = (useCase == .showAdaptivePanelWithCustomGuide) ? .withHeaderFooter : .onlyImage
+                let layoutGuide = contentVC.layoutGuideFor(mode: mode)
+                mainPanelVC.layout = ImageViewController.PanelLayout(targetGuide: layoutGuide)
+            } else {
+                mainPanelVC.layout = ImageViewController.PanelLayout(targetGuide: nil)
+            }
+            mainPanelVC.delegate = nil
+            mainPanelVC.isRemovalInteractionEnabled = true
+            mainPanelVC.track(scrollView: contentVC.scrollView)
+        default:
+            break
+        }
+    }
+
+    @objc
+    fileprivate func handleSurface(tapGesture: UITapGestureRecognizer) {
+        switch mainPanelVC.state {
+        case .full:
+            mainPanelVC.move(to: .half, animated: true)
+        default:
+            mainPanelVC.move(to: .full, animated: true)
+        }
+    }
+
+    func setUpSettingsPanel(for mainVC: MainViewController) {
+        guard settingsPanelVC == nil else { return }
+        // Initialize FloatingPanelController
+        settingsPanelVC = FloatingPanelController()
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        settingsPanelVC.surfaceView.appearance = appearance
+
+        settingsPanelVC.isRemovalInteractionEnabled = true
+        settingsPanelVC.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+        settingsPanelVC.delegate = self
+
+        let contentVC = mainVC.storyboard?.instantiateViewController(withIdentifier: "SettingsViewController")
+
+        // Set a content view controller
+        settingsPanelVC.set(contentViewController: contentVC)
+
+        //  Add FloatingPanel to self.view
+        settingsPanelVC.addPanel(toParent: mainVC, animated: true)
+    }
+}
+
+extension UseCaseController: FloatingPanelControllerDelegate {
+    func floatingPanel(_ vc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint {
+        if useCase == .showNavigationController, #available(iOS 11.0, *) {
+            // 148.0 is the SafeArea's top value for a navigation bar with a large title.
+            return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top - 148.0)
+        }
+        return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top)
+    }
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        if vc == settingsPanelVC {
+            return IntrinsicPanelLayout()
+        }
+
+        switch useCase {
+        case .showTopPositionedPanel:
+            return TopPositionedPanelLayout()
+        case .showRemovablePanel:
+            return newCollection.verticalSizeClass == .compact ? RemovablePanelLandscapeLayout() :  RemovablePanelLayout()
+        case .showIntrinsicView:
+            return IntrinsicPanelLayout()
+        case .showPanelModal:
+            if vc != mainPanelVC && vc != detailPanelVC {
+                return ModalPanelLayout()
+            }
+            fallthrough
+        case .showContentInset:
+            return FloatingPanelBottomLayout()
+        case .showCustomStatePanel:
+            return FloatingPanelLayoutWithCustomState()
+        default:
+            return (newCollection.verticalSizeClass == .compact) ? FloatingPanelBottomLayout() : mainVC
+        }
+    }
+
+    func floatingPanelDidRemove(_ vc: FloatingPanelController) {
+        switch vc {
+        case settingsPanelVC:
+            settingsPanelVC = nil
+        default:
+            break
+        }
+    }
+}
+
+extension UseCaseController: UIGestureRecognizerDelegate {
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        switch useCase {
+        case .showNestedScrollView:
+            return true
+        default:
+            return false
+        }
+    }
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+}
+
+extension UseCase {
+    func makeContentViewController(with storyboard: UIStoryboard) -> UIViewController {
+        guard let storyboardID = self.storyboardID else { return DebugTableViewController() }
+        return storyboard.instantiateViewController(withIdentifier: storyboardID)
+    }
+
+    func setUpInteraction(for useCaseController: UseCaseController) {
+        let mainVC = useCaseController.mainVC
+        let mainPanelVC = useCaseController.mainPanelVC!
+
+        // Enable tap-to-hide and removal interaction
+        switch self {
+        case .trackingTableView:
+            let tapGesture = UITapGestureRecognizer(target: useCaseController, action: #selector(UseCaseController.handleSurface(tapGesture:)))
+            tapGesture.cancelsTouchesInView = false
+            tapGesture.numberOfTapsRequired = 2
+            // Prevents a delay to response a tap in menus of DebugTableViewController.
+            tapGesture.delaysTouchesEnded = false
+            mainPanelVC.surfaceView.addGestureRecognizer(tapGesture)
+        case .showNestedScrollView:
+            mainPanelVC.panGestureRecognizer.delegateProxy = useCaseController
+        case .showPageContentView:
+            if let page = (mainPanelVC.contentViewController as? UIPageViewController)?.viewControllers?.first {
+                mainPanelVC.track(scrollView: (page as! DebugTableViewController).tableView)
+            }
+        case .showRemovablePanel, .showIntrinsicView:
+            mainPanelVC.isRemovalInteractionEnabled = true
+            mainPanelVC.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+        case .showNavigationController:
+            mainPanelVC.contentInsetAdjustmentBehavior = .never
+        case .showTopPositionedPanel: // For debug
+            let contentVC = UIViewController()
+            contentVC.view.backgroundColor = .red
+            mainPanelVC.set(contentViewController: contentVC)
+            mainPanelVC.addPanel(toParent: mainVC, animated: true)
+            return
+        default:
+            break
+        }
+    }
+}

Examples/Samples/Sources/UseCases/CustomState.swift

@@ -0,0 +1,22 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import Foundation
+import FloatingPanel
+
+extension FloatingPanelState {
+    static let lastQuart: FloatingPanelState = FloatingPanelState(rawValue: "lastQuart", order: 750)
+    static let firstQuart: FloatingPanelState = FloatingPanelState(rawValue: "firstQuart", order: 250)
+}
+
+class FloatingPanelLayoutWithCustomState: FloatingPanelBottomLayout {
+    override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .safeArea),
+            .lastQuart: FloatingPanelLayoutAnchor(fractionalInset: 0.75, edge: .bottom, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+            .firstQuart: FloatingPanelLayoutAnchor(fractionalInset: 0.25, edge: .bottom, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .bottom, referenceGuide: .safeArea),
+        ]
+    }
+}
+

Examples/Samples/Sources/UseCases/PagePanelController.swift

@@ -0,0 +1,82 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class PagePanelController: NSObject {
+    lazy var pages = [UIColor.blue, .red, .green].compactMap({ (color) -> UIViewController in
+        let page = FloatingPanelController(delegate: self)
+        page.view.backgroundColor = color
+        page.panGestureRecognizer.delegateProxy = self
+        page.show()
+        return page
+    })
+
+    func makePageViewControllerForContent() -> UIPageViewController {
+        pages = [DebugTableViewController(), DebugTableViewController(), DebugTableViewController()]
+        let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
+        pageVC.dataSource = self
+        pageVC.delegate = self
+        pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
+        return pageVC
+    }
+
+    func makePageViewController(for vc: MainViewController) -> UIPageViewController {
+        let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
+        let closeButton = UIButton(type: .custom)
+        pageVC.view.addSubview(closeButton)
+        closeButton.setTitle("Close", for: .normal)
+        closeButton.translatesAutoresizingMaskIntoConstraints = false
+        closeButton.addTarget(vc, action: #selector(MainViewController.dismissPresentedVC), for: .touchUpInside)
+        NSLayoutConstraint.activate([
+            closeButton.topAnchor.constraint(equalTo: pageVC.layoutGuide.topAnchor, constant: 16.0),
+            closeButton.leftAnchor.constraint(equalTo: pageVC.view.leftAnchor, constant: 16.0),
+            ])
+        pageVC.dataSource = self
+        pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
+        pageVC.modalPresentationStyle = .fullScreen
+        return pageVC
+    }
+}
+
+extension PagePanelController: FloatingPanelControllerDelegate {
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        return FloatingPanelBottomLayout()
+    }
+}
+
+extension PagePanelController: UIGestureRecognizerDelegate {
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return true
+    }
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+}
+
+
+extension PagePanelController: UIPageViewControllerDataSource {
+    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
+        guard
+            let index = pages.firstIndex(of: viewController),
+            index + 1 < pages.count
+            else { return nil }
+        return pages[index + 1]
+    }
+    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
+        guard
+            let index = pages.firstIndex(of: viewController),
+            index - 1 >= 0
+            else { return nil }
+        return pages[index - 1]
+    }
+}
+
+extension PagePanelController: UIPageViewControllerDelegate {
+    // For showPageContent
+    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
+        if completed, let page = pageViewController.viewControllers?.first {
+            (pageViewController.parent as! FloatingPanelController).track(scrollView: (page as! DebugTableViewController).tableView)
+        }
+    }
+}

Examples/Samples/Sources/UseCases/UseCase.swift

@@ -0,0 +1,78 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import Foundation
+
+enum UseCase: Int, CaseIterable {
+    case trackingTableView
+    case trackingTextView
+    case showDetail
+    case showModal
+    case showPanelModal
+    case showMultiPanelModal
+    case showPanelInSheetModal
+    case showTabBar
+    case showPageView
+    case showPageContentView
+    case showNestedScrollView
+    case showRemovablePanel
+    case showIntrinsicView
+    case showContentInset
+    case showContainerMargins
+    case showNavigationController
+    case showTopPositionedPanel
+    case showAdaptivePanel
+    case showAdaptivePanelWithCustomGuide
+    case showCustomStatePanel
+
+    var name: String {
+        switch self {
+        case .trackingTableView: return "Scroll tracking(TableView)"
+        case .trackingTextView: return "Scroll tracking(TextView)"
+        case .showDetail: return "Show Detail Panel"
+        case .showModal: return "Show Modal"
+        case .showPanelModal: return "Show Panel Modal"
+        case .showMultiPanelModal: return "Show Multi Panel Modal"
+        case .showPanelInSheetModal: return "Show Panel in Sheet Modal"
+        case .showTabBar: return "Show Tab Bar"
+        case .showPageView: return "Show Page View"
+        case .showPageContentView: return "Show Page Content View"
+        case .showNestedScrollView: return "Show Nested ScrollView"
+        case .showRemovablePanel: return "Show Removable Panel"
+        case .showIntrinsicView: return "Show Intrinsic View"
+        case .showContentInset: return "Show with ContentInset"
+        case .showContainerMargins: return "Show with ContainerMargins"
+        case .showNavigationController: return "Show Navigation Controller"
+        case .showTopPositionedPanel: return "Show Top Positioned Panel"
+        case .showAdaptivePanel: return "Show Adaptive Panel"
+        case .showAdaptivePanelWithCustomGuide: return "Show Adaptive Panel (Custom Layout Guide)"
+        case .showCustomStatePanel: return "Show Panel with Custom state"
+        }
+    }
+
+    var storyboardID: String? {
+        switch self {
+        case .trackingTableView: return nil
+        case .trackingTextView: return "ConsoleViewController" // Storyboard only
+        case .showDetail: return String(describing: DetailViewController.self)
+        case .showModal: return String(describing: ModalViewController.self)
+        case .showMultiPanelModal: return nil
+        case .showPanelInSheetModal: return nil
+        case .showPanelModal: return nil
+        case .showTabBar: return String(describing: TabBarViewController.self)
+        case .showPageView: return nil
+        case .showPageContentView: return nil
+        case .showNestedScrollView: return String(describing: NestedScrollViewController.self)
+        case .showRemovablePanel: return String(describing: DetailViewController.self)
+        case .showIntrinsicView: return "IntrinsicViewController" // Storyboard only
+        case .showContentInset: return nil
+        case .showContainerMargins: return nil
+        case .showNavigationController: return "RootNavigationController" // Storyboard only
+        case .showTopPositionedPanel: return nil
+        case .showAdaptivePanel,
+             .showAdaptivePanelWithCustomGuide:
+            return String(describing: ImageViewController.self)
+        case .showCustomStatePanel:
+            return nil
+        }
+    }
+}

Examples/Samples/Sources/ViewController.swift

@@ -1,627 +0,0 @@
-//
-//  ViewController.swift
-//  FloatingModalSample
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-import FloatingPanel
-
-class SampleListViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, FloatingPanelControllerDelegate, FloatingPanelLayout {
-    @IBOutlet weak var tableView: UITableView!
-
-    enum Menu: Int, CaseIterable {
-        case trackingTableView
-        case trackingTextView
-        case showDetail
-        case showModal
-        case showTabBar
-        case showNestedScrollView
-        case showRemovablePanel
-
-        var name: String {
-            switch self {
-            case .trackingTableView: return "Scroll tracking(TableView)"
-            case .trackingTextView: return "Scroll tracking(TextView)"
-            case .showDetail: return "Show Detail Panel"
-            case .showModal: return "Show Modal"
-            case .showTabBar: return "Show Tab Bar"
-            case .showNestedScrollView: return "Show Nested ScrollView"
-            case .showRemovablePanel: return "Show Removable Panel"
-            }
-        }
-
-        var storyboardID: String? {
-            switch self {
-            case .trackingTableView: return nil
-            case .trackingTextView: return "ConsoleViewController"
-            case .showDetail: return "DetailViewController"
-            case .showModal: return "ModalViewController"
-            case .showTabBar: return "TabBarViewController"
-            case .showNestedScrollView: return "NestedScrollViewController"
-            case .showRemovablePanel: return "DetailViewController"
-            }
-        }
-    }
-
-    var mainPanelVC: FloatingPanelController!
-    var detailPanelVC: FloatingPanelController!
-    var currentMenu: Menu = .trackingTableView
-
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        tableView.dataSource = self
-        tableView.delegate = self
-        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
-
-        let contentVC = DebugTableViewController()
-        addMainPanel(with: contentVC)
-    }
-
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-    }
-
-    func addMainPanel(with contentVC: UIViewController) {
-        // Initialize FloatingPanelController
-        mainPanelVC = FloatingPanelController()
-        mainPanelVC.delegate = self
-        mainPanelVC.isRemovalInteractionEnabled = (currentMenu == .showRemovablePanel)
-
-        // Initialize FloatingPanelController and add the view
-        mainPanelVC.surfaceView.cornerRadius = 6.0
-        mainPanelVC.surfaceView.shadowHidden = false
-
-        // Set a content view controller
-        mainPanelVC.set(contentViewController: contentVC)
-
-        // Track a scroll view
-        switch contentVC {
-        case let consoleVC as DebugTextViewController:
-            mainPanelVC.track(scrollView: consoleVC.textView)
-
-        case let contentVC as DebugTableViewController:
-            mainPanelVC.track(scrollView: contentVC.tableView)
-        case let contentVC as NestedScrollViewController:
-            mainPanelVC.track(scrollView: contentVC.scrollView)
-        default:
-            break
-        }
-        //  Add FloatingPanel to self.view
-        mainPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
-    }
-
-    @objc func dismissDetailPanelVC()  {
-        detailPanelVC.removePanelFromParent(animated: true, completion: nil)
-    }
-
-    // MARK:- TableViewDatasource
-
-    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return Menu.allCases.count
-    }
-
-    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
-        let menu = Menu.allCases[indexPath.row]
-        cell.textLabel?.text = menu.name
-        return cell
-    }
-
-    // MARK:- TableViewDelegate
-
-    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        let menu = Menu.allCases[indexPath.row]
-        let contentVC: UIViewController = {
-            guard let storyboardID = menu.storyboardID else { return DebugTableViewController() }
-            guard let vc = self.storyboard?.instantiateViewController(withIdentifier: storyboardID) else { fatalError() }
-            return vc
-        }()
-
-        self.currentMenu = menu
-
-        switch menu {
-        case .showDetail:
-            detailPanelVC?.removeFromParent()
-
-            // Initialize FloatingPanelController
-            detailPanelVC = FloatingPanelController()
-
-            // Initialize FloatingPanelController and add the view
-            detailPanelVC.surfaceView.cornerRadius = 6.0
-            detailPanelVC.surfaceView.shadowHidden = false
-
-            // Set a content view controller
-            detailPanelVC.set(contentViewController: contentVC)
-
-            //  Add FloatingPanel to self.view
-            detailPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
-        case .showModal, .showTabBar:
-            let modalVC = contentVC
-            present(modalVC, animated: true, completion: nil)
-        default:
-            detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
-            mainPanelVC?.removePanelFromParent(animated: true) {
-                self.addMainPanel(with: contentVC)
-            }
-        }
-    }
-
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        if currentMenu == .showRemovablePanel {
-            return newCollection.verticalSizeClass == .compact ? RemovablePanelLandscapeLayout() :  RemovablePanelLayout()
-        } else {
-            return self
-        }
-    }
-
-    var initialPosition: FloatingPanelPosition {
-        return .half
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0
-        case .half: return 262.0
-        case .tip: return 69.0
-        }
-    }
-}
-
-class RemovablePanelLayout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .half
-    }
-    var supportedPositions: Set<FloatingPanelPosition> {
-        return [.full, .half]
-    }
-    var bottomInteractionBuffer: CGFloat {
-        return 261.0 - 22.0
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 16.0
-        case .half: return 261.0
-        default: return nil
-        }
-    }
-    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat {
-        return 0.3
-    }
-}
-
-class RemovablePanelLandscapeLayout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .half
-    }
-    var supportedPositions: Set<FloatingPanelPosition> {
-        return [.half]
-    }
-    var bottomInteractionBuffer: CGFloat {
-        return 261.0 - 22.0
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .half: return 261.0
-        default: return nil
-        }
-    }
-    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat {
-        return 0.3
-    }
-}
-
-class NestedScrollViewController: UIViewController {
-    @IBOutlet weak var scrollView: UIScrollView!
-
-    @IBAction func longPressed(_ sender: Any) {
-        print("LongPressed!")
-    }
-    @IBAction func swipped(_ sender: Any) {
-        print("Swipped!")
-    }
-    @IBAction func tapped(_ sender: Any) {
-        print("Tapped!")
-    }
-}
-
-class DebugTextViewController: UIViewController, UITextViewDelegate {
-    @IBOutlet weak var textView: UITextView!
-
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        textView.delegate = self
-
-        if #available(iOS 11.0, *) {
-            textView.contentInsetAdjustmentBehavior = .never
-        }
-    }
-
-    func scrollViewDidScroll(_ scrollView: UIScrollView) {
-        print("TextView --- ", scrollView.contentOffset, scrollView.contentInset)
-        if #available(iOS 11.0, *) {
-            print("TextView --- ", scrollView.adjustedContentInset)
-        }
-    }
-
-    @IBAction func close(sender: UIButton) {
-        // Now impossible
-        // dismiss(animated: true, completion: nil)
-        (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
-    }
-}
-
-class DebugTableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
-    weak var tableView: UITableView!
-    var items: [String] = []
-    var itemHeight: CGFloat = 66.0
-    override func viewDidLoad() {
-        super.viewDidLoad()
-
-        let tableView = UITableView(frame: .zero,
-                                    style: .plain)
-        view.addSubview(tableView)
-        tableView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            tableView.topAnchor.constraint(equalTo: view.topAnchor),
-            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
-            tableView.leftAnchor.constraint(equalTo: view.leftAnchor),
-            tableView.rightAnchor.constraint(equalTo: view.rightAnchor)
-            ])
-        tableView.dataSource = self
-        tableView.delegate = self
-        self.tableView = tableView
-
-        let stackView = UIStackView()
-        view.addSubview(stackView)
-        stackView.axis = .vertical
-        stackView.distribution = .fillEqually
-        stackView.alignment = .trailing
-        stackView.spacing = 10.0
-        stackView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            stackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 22.0),
-            stackView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -22.0),
-            ])
-
-        let button = UIButton()
-        button.setTitle("Animate Scroll", for: .normal)
-        button.setTitleColor(view.tintColor, for: .normal)
-        button.addTarget(self, action: #selector(animateScroll), for: .touchUpInside)
-        stackView.addArrangedSubview(button)
-
-        let button2 = UIButton()
-        button2.setTitle("Change content size", for: .normal)
-        button2.setTitleColor(view.tintColor, for: .normal)
-        button2.addTarget(self, action: #selector(changeContentSize), for: .touchUpInside)
-        stackView.addArrangedSubview(button2)
-
-        for i in 0...100 {
-            items.append("Items \(i)")
-        }
-        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
-    }
-
-    @objc func animateScroll() {
-        tableView.scrollToRow(at: IndexPath(row: lround(Double(items.count) / 2.0),
-                                            section: 0),
-                              at: .top, animated: true)
-    }
-
-    @objc func changeContentSize() {
-        let actionSheet = UIAlertController(title: "Change content size", message: "", preferredStyle: .actionSheet)
-        actionSheet.addAction(UIAlertAction(title: "Large", style: .default, handler: { (_) in
-            self.itemHeight = 66.0
-            self.changeItems(100)
-        }))
-        actionSheet.addAction(UIAlertAction(title: "Match", style: .default, handler: { (_) in
-            switch self.tableView.bounds.height {
-            case 585: // iPhone 6,7,8
-                self.itemHeight = self.tableView.bounds.height / 13.0
-                self.changeItems(13)
-            case 656: // iPhone {6,7,8} Plus
-                self.itemHeight = self.tableView.bounds.height / 16.0
-                self.changeItems(16)
-            default: // iPhone X family
-                self.itemHeight = self.tableView.bounds.height / 12.0
-                self.changeItems(12)
-            }
-        }))
-        actionSheet.addAction(UIAlertAction(title: "Short", style: .default, handler: { (_) in
-            self.itemHeight = 66.0
-            self.changeItems(3)
-        }))
-
-        self.present(actionSheet, animated: true, completion: nil)
-    }
-
-    func changeItems(_ count: Int) {
-        items.removeAll()
-        for i in 0..<count {
-            items.append("Items \(i)")
-        }
-        tableView.reloadData()
-    }
-
-    @objc func close(sender: UIButton) {
-        //  Remove FloatingPanel from a view
-        (self.parent as! FloatingPanelController).removePanelFromParent(animated: true, completion: nil)
-    }
-
-    override func viewWillLayoutSubviews() {
-        super.viewWillLayoutSubviews()
-        //print("Content View: viewWillLayoutSubviews")
-    }
-
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        //print("Content View: viewDidLayoutSubviews")
-    }
-
-    override func viewWillAppear(_ animated: Bool) {
-        super.viewWillAppear(animated)
-        print("Content View: viewWillAppear")
-    }
-
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-        print("Content View: viewDidAppear", view.bounds)
-    }
-
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        print("Content View: viewWillDisappear")
-    }
-
-    override func viewDidDisappear(_ animated: Bool) {
-        super.viewDidDisappear(animated)
-        print("Content View: viewDidDisappear")
-    }
-
-    override func willMove(toParent parent: UIViewController?) {
-        super.willMove(toParent: parent)
-        print("Content View: willMove(toParent: \(String(describing: parent))")
-    }
-
-    override func didMove(toParent parent: UIViewController?) {
-        super.didMove(toParent: parent)
-        print("Content View: didMove(toParent: \(String(describing: parent))")
-    }
-
-    public override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
-        print("Content View: willTransition(to: \(newCollection), with: \(coordinator))")
-    }
-
-    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return items.count
-    }
-
-    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
-        return itemHeight
-    }
-
-    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
-        cell.textLabel?.text = items[indexPath.row]
-        return cell
-    }
-
-    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
-        return [
-            UITableViewRowAction(style: .destructive, title: "Delete", handler: { (action, path) in
-                self.items.remove(at: path.row)
-                tableView.deleteRows(at: [path], with: .automatic)
-            }),
-        ]
-    }
-}
-
-class DetailViewController: UIViewController {
-    @IBOutlet weak var closeButton: UIButton!
-    @IBAction func close(sender: UIButton) {
-        // Now impossible
-        // dismiss(animated: true, completion: nil)
-        (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
-    }
-
-    @IBAction func buttonPressed(_ sender: UIButton) {
-        switch sender.titleLabel?.text {
-        case "Show":
-            performSegue(withIdentifier: "ShowSegue", sender: self)
-        case "Present Modally":
-            performSegue(withIdentifier: "PresentModallySegue", sender: self)
-        default:
-            break
-        }
-    }
-
-    @IBAction func tapped(_ sender: Any) {
-        print("Detail panel is tapped!")
-    }
-    @IBAction func swipped(_ sender: Any) {
-        print("Detail panel is swipped!")
-    }
-    @IBAction func longPressed(_ sender: Any) {
-        print("Detail panel is longPressed!")
-    }
-}
-
-class ModalViewController: UIViewController, FloatingPanelControllerDelegate {
-    var fpc: FloatingPanelController!
-    var consoleVC: DebugTextViewController!
-
-    @IBOutlet weak var safeAreaView: UIView!
-
-    var isNewlayout: Bool = false
-
-    override func viewWillAppear(_ animated: Bool) {
-        super.viewWillAppear(animated)
-        // Initialize FloatingPanelController
-        fpc = FloatingPanelController()
-        fpc.delegate = self
-
-        // Initialize FloatingPanelController and add the view
-        fpc.surfaceView.cornerRadius = 6.0
-        fpc.surfaceView.shadowHidden = false
-
-        // Set a content view controller and track the scroll view
-        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
-        fpc.set(contentViewController: consoleVC)
-        fpc.track(scrollView: consoleVC.textView)
-
-        self.consoleVC = consoleVC
-
-        //  Add FloatingPanel to self.view
-        fpc.addPanel(toParent: self, belowView: safeAreaView)
-    }
-
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        //  Remove FloatingPanel from a view
-        fpc.removePanelFromParent(animated: false)
-    }
-
-    @IBAction func close(sender: UIButton) {
-        dismiss(animated: true, completion: nil)
-    }
-
-    @IBAction func moveToFull(sender: UIButton) {
-        fpc.move(to: .full, animated: true)
-    }
-    @IBAction func moveToHalf(sender: UIButton) {
-        fpc.move(to: .half, animated: true)
-    }
-    @IBAction func moveToTip(sender: UIButton) {
-        fpc.move(to: .tip, animated: true)
-    }
-
-    @IBAction func updateLayout(_ sender: Any) {
-        isNewlayout = !isNewlayout
-        UIView.animate(withDuration: 0.5) {
-            self.fpc.updateLayout()
-        }
-    }
-
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        return (isNewlayout) ? ModalSecondLayout() : nil
-    }
-}
-
-class ModalSecondLayout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .half
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 18.0
-        case .half: return 262.0
-        case .tip: return 44.0
-        }
-    }
-}
-
-class TabBarViewController: UITabBarController {}
-
-class TabBarContentViewController: UIViewController, FloatingPanelControllerDelegate {
-    var fpc: FloatingPanelController!
-    var consoleVC: DebugTextViewController!
-
-    override func viewWillAppear(_ animated: Bool) {
-        super.viewWillAppear(animated)
-        // Initialize FloatingPanelController
-        fpc = FloatingPanelController()
-        fpc.delegate = self
-
-        // Initialize FloatingPanelController and add the view
-        fpc.surfaceView.cornerRadius = 6.0
-        fpc.surfaceView.shadowHidden = false
-
-        // Set a content view controller and track the scroll view
-        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
-        fpc.set(contentViewController: consoleVC)
-        fpc.track(scrollView: consoleVC.textView)
-        self.consoleVC = consoleVC
-
-        //  Add FloatingPanel to self.view
-        fpc.addPanel(toParent: self)
-    }
-
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        //  Remove FloatingPanel from a view
-        fpc.removePanelFromParent(animated: false)
-    }
-
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        switch self.tabBarItem.tag {
-        case 0:
-            return OneTabBarPanelLayout()
-        case 1:
-            return TwoTabBarPanel2Layout()
-        default:
-            return nil
-        }
-    }
-
-    @IBAction func close(sender: UIButton) {
-        dismiss(animated: true, completion: nil)
-    }
-}
-
-extension FloatingPanelLayout {
-    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
-        if #available(iOS 11.0, *) {
-            return [
-                surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
-                surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
-            ]
-        } else {
-            return [
-                surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0),
-                surfaceView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0),
-            ]
-        }
-    }
-}
-
-class OneTabBarPanelLayout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .tip
-    }
-    var supportedPositions: Set<FloatingPanelPosition> {
-        return [.full, .tip]
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 16.0
-        case .tip: return 22.0
-        default: return nil
-        }
-    }
-}
-
-class TwoTabBarPanel2Layout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .half
-    }
-    var supportedPositions: Set<FloatingPanelPosition> {
-        return [.full, .half]
-    }
-    var bottomInteractionBuffer: CGFloat {
-        return 261.0 - 22.0
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 16.0
-        case .half: return 261.0
-        default: return nil
-        }
-    }
-}

Examples/Samples/Sources/ViewControllers/DebugTableViewController.swift

@@ -0,0 +1,278 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+class DebugTableViewController: InspectableViewController {
+    // MARK: - Views
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView(frame: .zero, style: .plain)
+        tableView.dataSource = self
+        tableView.delegate = self
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
+        return tableView
+    }()
+    lazy var buttonStackView: UIStackView = {
+        let stackView = UIStackView()
+        stackView.axis = .vertical
+        stackView.distribution = .fillEqually
+        stackView.alignment = .trailing
+        stackView.spacing = 10.0
+        return stackView
+    }()
+    private lazy var reorderButton: UIButton = {
+        let button = UIButton()
+        button.setTitle(Menu.reorder.rawValue, for: .normal)
+        button.setTitleColor(view.tintColor, for: .normal)
+        button.addTarget(self, action: #selector(reorderItems), for: .touchUpInside)
+        return button
+    }()
+    private lazy var trackingSwitchWrapper: UIStackView = {
+        let stackView = UIStackView()
+        stackView.axis = .horizontal
+        stackView.distribution = .fillProportionally
+        stackView.alignment = .center
+        stackView.spacing = 8.0
+        stackView.addArrangedSubview(trackingLabel)
+        stackView.addArrangedSubview(trackingSwitch)
+        return stackView
+    }()
+    private lazy var trackingLabel: UILabel = {
+        let label = UILabel()
+        label.text = "Tracking"
+        label.font = UIFont.systemFont(ofSize: 17.0, weight: .regular)
+        return label
+    }()
+    private lazy var trackingSwitch: UISwitch = {
+        let trackingSwitch = UISwitch()
+        trackingSwitch.isOn = true
+        trackingSwitch.addTarget(self, action: #selector(turnTrackingOn), for: .touchUpInside)
+        return trackingSwitch
+    }()
+
+    // MARK: - Properties
+
+    private lazy var items: [String] = {
+        let items = (0..<100).map { "Items \($0)" }
+        return Command.replace(items: items)
+    }()
+    private var itemHeight: CGFloat = 66.0
+
+    enum Menu: String, CaseIterable {
+        case turnOffTracking = "Tracking"
+        case reorder = "Reorder"
+    }
+
+    enum Command: Int, CaseIterable {
+        case animateScroll
+        case changeContentSize
+        case moveToFull
+        case moveToHalf
+        var text: String {
+            switch self {
+            case .animateScroll: return "Scroll in the middle"
+            case .changeContentSize: return "Change content size"
+            case .moveToFull: return "Move to Full"
+            case.moveToHalf: return "Move to Half"
+            }
+        }
+
+        static func replace(items: [String]) -> [String] {
+            return items.enumerated().map { (index, text) -> String in
+                if let action = Command(rawValue: index) {
+                    return "\(index). \(action.text)"
+                }
+                return text
+            }
+        }
+
+        func execute(for vc: DebugTableViewController, sourceView: UIView) {
+            switch self {
+            case .animateScroll:
+                vc.animateScroll()
+            case .changeContentSize:
+                vc.changeContentSize(sourceView: sourceView)
+            case .moveToFull:
+                vc.moveToFull()
+            case .moveToHalf:
+                vc.moveToHalf()
+            }
+        }
+    }
+
+    // MARK: - Lifecycle
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        layoutTableView()
+        layoutMenuStackView()
+        setUpMenu()
+    }
+
+    private func layoutTableView() {
+        view.addSubview(tableView)
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            tableView.leftAnchor.constraint(equalTo: view.leftAnchor),
+            tableView.rightAnchor.constraint(equalTo: view.rightAnchor)
+            ])
+    }
+
+    private func layoutMenuStackView() {
+        view.addSubview(buttonStackView)
+        buttonStackView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            buttonStackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 22.0),
+            buttonStackView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -22.0),
+            ])
+    }
+
+    private func setUpMenu() {
+        for menu in Menu.allCases {
+            switch menu {
+            case .reorder:
+                buttonStackView.addArrangedSubview(reorderButton)
+            case .turnOffTracking:
+                buttonStackView.addArrangedSubview(trackingSwitchWrapper)
+            }
+        }
+    }
+
+    // MARK: - Menu
+    @objc
+    private func reorderItems() {
+        if reorderButton.titleLabel?.text == Menu.reorder.rawValue {
+            tableView.isEditing = true
+            reorderButton.setTitle("Cancel", for: .normal)
+        } else {
+            tableView.isEditing = false
+            reorderButton.setTitle(Menu.reorder.rawValue, for: .normal)
+        }
+    }
+
+    @objc
+    private func turnTrackingOn(_ sender: UISwitch) {
+        guard let fpc = self.parent as? FloatingPanelController else { return }
+        if sender.isOn {
+            fpc.track(scrollView: tableView)
+        } else {
+            fpc.untrack(scrollView: tableView)
+        }
+    }
+
+    // MARK: - Actions
+
+    private func execute(command: Command, sourceView: UIView) {
+        command.execute(for: self, sourceView: sourceView)
+    }
+
+    @objc
+    private func animateScroll() {
+        tableView.scrollToRow(at: IndexPath(row: lround(Double(items.count) / 2.0),
+                                            section: 0),
+                              at: .top, animated: true)
+    }
+
+    @objc
+    private func changeContentSize(sourceView: UIView) {
+        let actionSheet = UIAlertController(title: "Change content size", message: "", preferredStyle: .actionSheet)
+        actionSheet.addAction(UIAlertAction(title: "Large", style: .default, handler: { (_) in
+            self.itemHeight = 66.0
+            self.changeItems(100)
+        }))
+        actionSheet.addAction(UIAlertAction(title: "Match", style: .default, handler: { (_) in
+            switch self.tableView.bounds.height {
+            case 585: // iPhone 6,7,8
+                self.itemHeight = self.tableView.bounds.height / 13.0
+                self.changeItems(13)
+            case 656: // iPhone {6,7,8} Plus
+                self.itemHeight = self.tableView.bounds.height / 16.0
+                self.changeItems(16)
+            default: // iPhone X family
+                self.itemHeight = self.tableView.bounds.height / 12.0
+                self.changeItems(12)
+            }
+        }))
+        actionSheet.addAction(UIAlertAction(title: "Short", style: .default, handler: { (_) in
+            self.itemHeight = 66.0
+            self.changeItems(3)
+        }))
+
+        if let popoverController = actionSheet.popoverPresentationController {
+            popoverController.sourceView = sourceView
+            popoverController.sourceRect = sourceView.bounds
+        }
+
+        self.present(actionSheet, animated: true, completion: nil)
+    }
+
+    private func changeItems(_ count: Int) {
+        items = Command.replace(items: (0..<count).map{ "\($0). No action" })
+        tableView.reloadData()
+    }
+
+    @objc
+    private func moveToFull() {
+        (self.parent as! FloatingPanelController).move(to: .full, animated: true)
+    }
+
+    @objc
+    private func moveToHalf() {
+        (self.parent as! FloatingPanelController).move(to: .half, animated: true)
+    }
+
+    @objc
+    private func close(sender: UIButton) {
+        //  Remove FloatingPanel from a view
+        (self.parent as! FloatingPanelController).removePanelFromParent(animated: true, completion: nil)
+    }
+}
+
+extension DebugTableViewController: UITableViewDataSource {
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return items.count
+    }
+
+    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
+        return itemHeight
+    }
+
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        cell.textLabel?.text = items[indexPath.row]
+        return cell
+    }
+}
+
+extension DebugTableViewController: UITableViewDelegate {
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        print("TableView --- ", scrollView.contentOffset, scrollView.contentInset)
+    }
+
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        print("DebugTableViewController -- select row \(indexPath.row)")
+        guard let action = Command(rawValue: indexPath.row) else { return }
+        let cell = tableView.cellForRow(at: indexPath)
+        execute(command: action, sourceView: cell ?? tableView)
+    }
+
+    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
+        return [
+            UITableViewRowAction(style: .destructive, title: "Delete", handler: { (action, path) in
+                self.items.remove(at: path.row)
+                tableView.deleteRows(at: [path], with: .automatic)
+            }),
+        ]
+    }
+
+    func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
+        return true
+    }
+
+    func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
+        items.insert(items.remove(at: sourceIndexPath.row), at: destinationIndexPath.row)
+    }
+}

Examples/Samples/Sources/ViewControllers/DebugTextViewController.swift

@@ -0,0 +1,44 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+final class DebugTextViewController: UIViewController, UITextViewDelegate {
+    @IBOutlet weak var textView: UITextView!
+    @IBOutlet weak var textViewTopConstraint: NSLayoutConstraint!
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        textView.delegate = self
+        print("viewDidLoad: TextView --- ", textView.contentOffset, textView.contentInset)
+
+        if #available(iOS 11.0, *) {
+            textView.contentInsetAdjustmentBehavior = .never
+        }
+    }
+
+    override func viewWillLayoutSubviews() {
+        print("viewWillLayoutSubviews: TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        print("viewDidLayoutSubviews: TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        print("TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
+    }
+
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        print("TextView --- ", scrollView.contentOffset, scrollView.contentInset)
+        if #available(iOS 11.0, *) {
+            print("TextView --- ", scrollView.adjustedContentInset)
+        }
+    }
+
+    @IBAction func close(sender: UIButton) {
+        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
+        dismiss(animated: true, completion: nil)
+    }
+}

Examples/Samples/Sources/ViewControllers/DetailViewController.swift

@@ -0,0 +1,39 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class DetailViewController: InspectableViewController {
+    @IBOutlet weak var modeChangeView: UIStackView!
+    @IBOutlet weak var intrinsicHeightConstraint: NSLayoutConstraint!
+    @IBOutlet weak var closeButton: UIButton!
+    @IBAction func close(sender: UIButton) {
+        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
+        dismiss(animated: true, completion: nil)
+    }
+
+    @IBAction func buttonPressed(_ sender: UIButton) {
+        switch sender.titleLabel?.text {
+        case "Show":
+            performSegue(withIdentifier: "ShowSegue", sender: self)
+        case "Present Modally":
+            performSegue(withIdentifier: "PresentModallySegue", sender: self)
+        default:
+            break
+        }
+    }
+    @IBAction func modeChanged(_ sender: Any) {
+        guard let fpc = parent as? FloatingPanelController else { return }
+        fpc.contentMode = (fpc.contentMode == .static) ? .fitToBounds : .static
+    }
+
+    @IBAction func tapped(_ sender: Any) {
+        print("Detail panel is tapped!")
+    }
+    @IBAction func swipped(_ sender: Any) {
+        print("Detail panel is swipped!")
+    }
+    @IBAction func longPressed(_ sender: Any) {
+        print("Detail panel is longPressed!")
+    }
+}

Examples/Samples/Sources/ViewControllers/ImageViewController.swift

@@ -0,0 +1,69 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class ImageViewController: UIViewController {
+    class PanelLayout: FloatingPanelLayout {
+        weak var targetGuide: UILayoutGuide?
+        init(targetGuide: UILayoutGuide?) {
+            self.targetGuide = targetGuide
+        }
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .full
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            if #available(iOS 11.0, *), let targetGuide = targetGuide {
+                return [
+                    .full: FloatingPanelAdaptiveLayoutAnchor(absoluteOffset: 0,
+                                                             contentLayout: targetGuide,
+                                                             referenceGuide: .superview),
+                    .half: FloatingPanelAdaptiveLayoutAnchor(fractionalOffset: 0.5,
+                                                             contentLayout: targetGuide,
+                                                             referenceGuide: .superview)
+                ]
+            } else {
+                return [
+                    .full: FloatingPanelLayoutAnchor(absoluteInset: 500,
+                                                     edge: .bottom,
+                                                     referenceGuide: .superview)
+                ]
+            }
+        }
+    }
+
+    @IBOutlet weak var headerView: UIView!
+    @IBOutlet weak var footerView: UIView!
+    @IBOutlet weak var scrollView: UIScrollView!
+    @IBOutlet weak var stackView: UIStackView!
+
+    enum Mode {
+        case onlyImage
+        case withHeaderFooter
+    }
+
+    @available(iOS 11.0, *)
+    func layoutGuideFor(mode: Mode) -> UILayoutGuide {
+        switch mode {
+        case .onlyImage:
+            self.headerView.isHidden = true
+            self.footerView.isHidden = true
+            return scrollView.contentLayoutGuide
+        case .withHeaderFooter:
+            self.headerView.isHidden = false
+            self.footerView.isHidden = false
+            let guide = UILayoutGuide()
+            view.addLayoutGuide(guide)
+
+            NSLayoutConstraint.activate([
+                scrollView.heightAnchor.constraint(equalTo: scrollView.contentLayoutGuide.heightAnchor),
+
+                guide.topAnchor.constraint(equalTo: stackView.topAnchor),
+                guide.leftAnchor.constraint(equalTo: stackView.leftAnchor),
+                guide.bottomAnchor.constraint(equalTo: stackView.bottomAnchor),
+                guide.rightAnchor.constraint(equalTo: stackView.rightAnchor),
+            ])
+            return guide
+        }
+    }
+}
+

Examples/Samples/Sources/ViewControllers/InspectorViewController.swift

@@ -0,0 +1,48 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+class InspectableViewController: UIViewController {
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+        print(">>> Content View: viewWillLayoutSubviews", layoutInsets)
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        print(">>> Content View: viewDidLayoutSubviews", layoutInsets)
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        print(">>> Content View: viewWillAppear", layoutInsets)
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        print(">>> Content View: viewDidAppear", view.bounds, layoutInsets)
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        print(">>> Content View: viewWillDisappear")
+    }
+
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        print(">>> Content View: viewDidDisappear")
+    }
+
+    override func willMove(toParent parent: UIViewController?) {
+        super.willMove(toParent: parent)
+        print(">>> Content View: willMove(toParent: \(String(describing: parent))")
+    }
+
+    override func didMove(toParent parent: UIViewController?) {
+        super.didMove(toParent: parent)
+        print(">>> Content View: didMove(toParent: \(String(describing: parent))")
+    }
+    public override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+        print(">>> Content View: willTransition(to: \(newCollection), with: \(coordinator))", layoutInsets)
+    }
+}

Examples/Samples/Sources/ViewControllers/ModalViewController.swift

@@ -0,0 +1,79 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class ModalViewController: UIViewController, FloatingPanelControllerDelegate {
+    var fpc: FloatingPanelController!
+    var consoleVC: DebugTextViewController!
+
+    @IBOutlet weak var safeAreaView: UIView!
+
+    var isNewlayout: Bool = false
+
+    override func viewDidLoad() {
+        // Initialize FloatingPanelController
+        fpc = FloatingPanelController()
+        fpc.delegate = self
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        fpc.surfaceView.appearance = appearance
+
+        // Set a content view controller and track the scroll view
+        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
+        fpc.set(contentViewController: consoleVC)
+        fpc.track(scrollView: consoleVC.textView)
+
+        self.consoleVC = consoleVC
+
+        //  Add FloatingPanel to self.view
+        fpc.addPanel(toParent: self, at: view.subviews.firstIndex(of: safeAreaView) ?? -1)
+    }
+
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        //  Remove FloatingPanel from a view
+        fpc.removePanelFromParent(animated: false)
+    }
+
+    @IBAction func close(sender: UIButton) {
+        dismiss(animated: true, completion: nil)
+    }
+
+    @IBAction func moveToFull(sender: UIButton) {
+        fpc.move(to: .full, animated: true)
+    }
+    @IBAction func moveToHalf(sender: UIButton) {
+        fpc.move(to: .half, animated: true)
+    }
+    @IBAction func moveToTip(sender: UIButton) {
+        fpc.move(to: .tip, animated: true)
+    }
+    @IBAction func moveToHidden(sender: UIButton) {
+        fpc.move(to: .hidden, animated: true)
+    }
+    @IBAction func updateLayout(_ sender: Any) {
+        isNewlayout = !isNewlayout
+        UIView.animate(withDuration: 0.5) {
+            self.fpc.layout = (self.isNewlayout) ? ModalSecondLayout() : FloatingPanelBottomLayout()
+            self.fpc.invalidateLayout()
+        }
+    }
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        return (isNewlayout) ? ModalSecondLayout() : FloatingPanelBottomLayout()
+    }
+
+    class ModalSecondLayout: FloatingPanelLayout {
+        var position: FloatingPanelPosition = .bottom
+        var initialState: FloatingPanelState { .half }
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            return [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+                .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea),
+                .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
+            ]
+        }
+    }
+}

Examples/Samples/Sources/ViewControllers/MultiPanelController.swift

@@ -0,0 +1,67 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+import WebKit
+
+final class MultiPanelController: FloatingPanelController, FloatingPanelControllerDelegate {
+
+    private final class FirstPanelContentViewController: UIViewController {
+
+        lazy var webView: WKWebView = WKWebView()
+
+        override func viewDidLoad() {
+            super.viewDidLoad()
+            view.addSubview(webView)
+            webView.frame = view.bounds
+            webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+            webView.load(URLRequest(url: URL(string: "https://www.apple.com")!))
+
+            let vc = MultiSecondPanelController()
+            vc.setUpContent()
+            vc.addPanel(toParent: self)
+        }
+    }
+
+    private final class MultiSecondPanelController: FloatingPanelController {
+
+        private final class SecondPanelContentViewController: DebugTableViewController {}
+
+        func setUpContent() {
+            contentInsetAdjustmentBehavior = .never
+            let vc = SecondPanelContentViewController()
+            vc.loadViewIfNeeded()
+            vc.title = "Second Panel"
+            vc.buttonStackView.isHidden = true
+            let navigationController = UINavigationController(rootViewController: vc)
+            navigationController.navigationBar.barTintColor = .white
+            navigationController.navigationBar.titleTextAttributes = [
+                .foregroundColor: UIColor.black
+            ]
+            set(contentViewController: navigationController)
+            self.track(scrollView: vc.tableView)
+            surfaceView.containerMargins = .init(top: 24.0, left: 0.0, bottom: layoutInsets.bottom, right: 0.0)
+        }
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        layout = FirstViewLayout()
+        isRemovalInteractionEnabled = true
+
+        let vc = FirstPanelContentViewController()
+        set(contentViewController: vc)
+        track(scrollView: vc.webView.scrollView)
+    }
+
+    private final class FirstViewLayout: FloatingPanelLayout {
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .full
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            return [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 40.0, edge: .top, referenceGuide: .superview)
+            ]
+        }
+    }
+}
+

Examples/Samples/Sources/ViewControllers/NestedScrollViewController.swift

@@ -0,0 +1,18 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+final class NestedScrollViewController: UIViewController {
+    @IBOutlet weak var scrollView: UIScrollView!
+    @IBOutlet weak var nestedScrollView: UIScrollView!
+
+    @IBAction func longPressed(_ sender: Any) {
+        print("LongPressed!")
+    }
+    @IBAction func swipped(_ sender: Any) {
+        print("Swipped!")
+    }
+    @IBAction func tapped(_ sender: Any) {
+        print("Tapped!")
+    }
+}

Examples/Samples/Sources/ViewControllers/SettingsViewController.swift

@@ -0,0 +1,36 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class SettingsViewController: InspectableViewController {
+    @IBOutlet weak var largeTitlesSwicth: UISwitch!
+    @IBOutlet weak var translucentSwicth: UISwitch!
+    @IBOutlet weak var versionLabel: UILabel!
+
+    override func viewDidLoad() {
+        versionLabel.text = "Version: \(Bundle.main.infoDictionary?["CFBundleVersion"] ?? "--")"
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        if #available(iOS 11.0, *) {
+            let prefersLargeTitles = navigationController!.navigationBar.prefersLargeTitles
+            largeTitlesSwicth.setOn(prefersLargeTitles, animated: false)
+        } else {
+            largeTitlesSwicth.isEnabled = false
+        }
+        let isTranslucent = navigationController!.navigationBar.isTranslucent
+        translucentSwicth.setOn(isTranslucent, animated: false)
+    }
+
+    @IBAction func toggleLargeTitle(_ sender: UISwitch) {
+        if #available(iOS 11.0, *) {
+            navigationController?.navigationBar.prefersLargeTitles = sender.isOn
+        }
+    }
+    @IBAction func toggleTranslucent(_ sender: UISwitch) {
+        navigationController?.navigationBar.isTranslucent = sender.isOn
+    }
+}
+

Examples/Samples/Sources/ViewControllers/TabBarViewController.swift

@@ -0,0 +1,252 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class TabBarViewController: UITabBarController {}
+
+final class TabBarContentViewController: UIViewController {
+    enum Tab3Mode {
+        case changeOffset
+        case changeAutoLayout
+        var label: String {
+            switch self {
+            case .changeAutoLayout: return "Use AutoLayout(OK)"
+            case .changeOffset: return "Use ContentOffset(NG)"
+            }
+        }
+    }
+    lazy var fpc = FloatingPanelController()
+    var consoleVC: DebugTextViewController!
+
+    var threeLayout: ThreeTabBarPanelLayout!
+    var tab3Mode: Tab3Mode = .changeAutoLayout
+    var switcherLabel: UILabel!
+
+    override func viewDidLoad() {
+        fpc.delegate = self
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        fpc.surfaceView.appearance = appearance
+
+        // Set a content view controller and track the scroll view
+        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
+        fpc.set(contentViewController: consoleVC)
+        consoleVC.textView.delegate = self // MUST call it before fpc.track(scrollView:)
+        fpc.track(scrollView: consoleVC.textView)
+        self.consoleVC = consoleVC
+
+        //  Add FloatingPanel to self.view
+        fpc.addPanel(toParent: self)
+
+
+        if #available(iOS 15, *) {
+            tabBarController?.tabBar.scrollEdgeAppearance = UITabBarAppearance()
+        }
+
+        switch tabBarItem.tag {
+        case 1:
+            fpc.behavior = TwoTabBarPanelBehavior()
+        case 2:
+            let switcher = UISwitch()
+            fpc.view.addSubview(switcher)
+            switcher.translatesAutoresizingMaskIntoConstraints = false
+            NSLayoutConstraint.activate([
+                switcher.bottomAnchor.constraint(equalTo: fpc.surfaceView.topAnchor, constant: -16.0),
+                switcher.rightAnchor.constraint(equalTo: fpc.surfaceView.rightAnchor, constant: -16.0),
+                ])
+            switcher.isOn = true
+            switcher.tintColor = .white
+            switcher.backgroundColor = .white
+            switcher.layer.cornerRadius = 16.0
+            switcher.addTarget(self,
+                               action: #selector(changeTab3Mode(_:)),
+                               for: .valueChanged)
+            let label = UILabel()
+            label.text = tab3Mode.label
+            fpc.view.addSubview(label)
+            switcherLabel = label
+            label.translatesAutoresizingMaskIntoConstraints = false
+            NSLayoutConstraint.activate([
+                label.centerYAnchor.constraint(equalTo: switcher.centerYAnchor, constant: 0.0),
+                label.rightAnchor.constraint(equalTo: switcher.leftAnchor, constant: -16.0),
+                ])
+
+            // Turn off the mask instead of content inset change
+            consoleVC.textView.clipsToBounds = false
+        default:
+            break
+        }
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        fpc.invalidateLayout()
+    }
+
+    // MARK: - Action
+
+    @IBAction func close(sender: UIButton) {
+        dismiss(animated: true, completion: nil)
+    }
+
+    // MARK: - Private
+
+    @objc
+    private func changeTab3Mode(_ sender: UISwitch) {
+        if sender.isOn {
+            tab3Mode = .changeAutoLayout
+        } else {
+            tab3Mode = .changeOffset
+        }
+        switcherLabel.text = tab3Mode.label
+    }
+}
+
+extension TabBarContentViewController: UITextViewDelegate {
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        guard self.tabBarItem.tag == 2 else { return }
+        // Reset an invalid content offset by a user after updating the layout
+        // of `consoleVC.textView`.
+        // NOTE: FloatingPanel doesn't implicitly reset the offset(i.e.
+        // Using KVO of `scrollView.contentOffset`). Because it can lead to an
+        // infinite loop if a user also resets a content offset as below and,
+        // in the situation, a user has to modify the library.
+        if fpc.state != .full, fpc.surfaceLocation.y > fpc.surfaceLocation(for: .full).y {
+            scrollView.contentOffset = .zero
+        }
+    }
+}
+
+extension TabBarContentViewController: FloatingPanelControllerDelegate {
+    // MARK: - FloatingPanel
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        switch self.tabBarItem.tag {
+        case 0:
+            return OneTabBarPanelLayout()
+        case 1:
+            return TwoTabBarPanelLayout()
+        case 2:
+            threeLayout = ThreeTabBarPanelLayout(parent: self)
+            return threeLayout
+        default:
+            return FloatingPanelBottomLayout()
+        }
+    }
+
+    func floatingPanelDidMove(_ vc: FloatingPanelController) {
+        guard self.tabBarItem.tag == 2 else { return }
+        switch tab3Mode {
+        case .changeAutoLayout:
+            /* Good solution: Manipulate top constraint */
+            assert(consoleVC.textViewTopConstraint != nil)
+            let safeAreaTop = vc.layoutInsets.top
+            if vc.surfaceLocation.y + threeLayout.topPadding < safeAreaTop {
+                consoleVC.textViewTopConstraint?.constant = min(safeAreaTop - vc.surfaceLocation.y,
+                                                                safeAreaTop)
+            } else {
+                consoleVC.textViewTopConstraint?.constant = threeLayout.topPadding
+            }
+        case .changeOffset:
+            /*
+             Bad solution: Manipulate scroll content inset
+
+             FloatingPanelController keeps a content offset in moving a panel
+             so that changing content inset or offset causes a buggy behavior.
+             */
+            guard let scrollView = consoleVC.textView else { return }
+            var insets = vc.adjustedContentInsets
+            if vc.surfaceView.frame.minY < vc.layoutInsets.top {
+                insets.top = vc.layoutInsets.top - vc.surfaceView.frame.minY
+            } else {
+                insets.top = 0.0
+            }
+            scrollView.contentInset = insets
+
+            if vc.surfaceView.frame.minY > 0 {
+                scrollView.contentOffset = CGPoint(x: 0.0,
+                                                   y: 0.0 - scrollView.contentInset.top)
+            }
+        }
+
+        if vc.surfaceLocation.y > vc.surfaceLocation(for: .half).y {
+            let progress = (vc.surfaceLocation.y - vc.surfaceLocation(for: .half).y)
+                / (vc.surfaceLocation(for: .tip).y - vc.surfaceLocation(for: .half).y)
+            threeLayout.leftConstraint.constant = max(min(progress, 1.0), 0.0) * threeLayout.sideMargin
+            threeLayout.rightConstraint.constant = -max(min(progress, 1.0), 0.0) * threeLayout.sideMargin
+        } else {
+            threeLayout.leftConstraint.constant = 0.0
+            threeLayout.rightConstraint.constant = 0.0
+        }
+    }
+}
+
+class OneTabBarPanelLayout: FloatingPanelLayout {
+    var initialState: FloatingPanelState { .tip }
+    var position: FloatingPanelPosition { .bottom }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 22.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class TwoTabBarPanelLayout: FloatingPanelLayout {
+    var initialState: FloatingPanelState { .half }
+    var position: FloatingPanelPosition { .bottom }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class TwoTabBarPanelBehavior: FloatingPanelBehavior {
+    func allowsRubberBanding(for edges: UIRectEdge) -> Bool {
+        return [UIRectEdge.top, UIRectEdge.bottom].contains(edges)
+    }
+}
+
+
+class ThreeTabBarPanelLayout: FloatingPanelLayout {
+    weak var parentVC: UIViewController!
+
+    var leftConstraint: NSLayoutConstraint!
+    var rightConstraint: NSLayoutConstraint!
+
+    let topPadding: CGFloat = 17.0
+    let sideMargin: CGFloat = 16.0
+
+    init(parent: UIViewController) {
+        parentVC = parent
+    }
+
+    var initialState: FloatingPanelState { .half }
+    var position: FloatingPanelPosition { .bottom }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0 + parentVC.layoutInsets.bottom, edge: .bottom, referenceGuide: .superview),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 88.0 + parentVC.layoutInsets.bottom, edge: .bottom, referenceGuide: .superview),
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+
+    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
+        if #available(iOS 11.0, *) {
+            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0)
+            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0)
+        } else {
+            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0)
+            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0)
+        }
+        return [ leftConstraint, rightConstraint ]
+    }
+}

Examples/Samples/Tests/SampleTests.swift

@@ -1,10 +1,4 @@
-//
-//  FloatingModalSampleTests.swift
-//  FloatingModalSampleTests
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
 @testable import FloatingPanelSample

Examples/Samples/UITests/SampleUITests.swift

@@ -1,7 +1,4 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
 

Examples/SamplesObjC/SamplesObjC.xcodeproj/project.pbxproj

@@ -0,0 +1,375 @@
+// !$*UTF8*$!
+{
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+	classes = {
+	};
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+/* Begin PBXFileReference section */
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+		};
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+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
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+		545BA71721BA3217007F7846 /* Build configuration list for PBXNativeTarget "SamplesObjC" */ = {
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+	};
+	rootObject = 545BA6F921BA3214007F7846 /* Project object */;
+}

Examples/SamplesObjC/SamplesObjC.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -2,6 +2,6 @@
 <Workspace
    version = "1.0">
    <FileRef
-      location = "self:FloatingModalController.xcodeproj">
+      location = "self:SamplesObjC.xcodeproj">
    </FileRef>
 </Workspace>

Examples/SamplesObjC/SamplesObjC.xcodeproj/xcshareddata/xcschemes/SamplesObjC.xcscheme

@@ -0,0 +1,87 @@
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+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
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+               BlueprintIdentifier = "545BA70021BA3214007F7846"
+               BuildableName = "SamplesObjC.app"
+               BlueprintName = "SamplesObjC"
+               ReferencedContainer = "container:SamplesObjC.xcodeproj">
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+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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+      useCustomWorkingDirectory = "NO"
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+         runnableDebuggingMode = "0">
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Examples/SamplesObjC/SamplesObjC/AppDelegate.h

@@ -0,0 +1,9 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow* window;
+
+@end

Examples/SamplesObjC/SamplesObjC/AppDelegate.m

@@ -0,0 +1,9 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+#import "AppDelegate.h"
+
+@interface AppDelegate ()
+@end
+
+@implementation AppDelegate
+@end

Examples/SamplesObjC/SamplesObjC/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Examples/SamplesObjC/SamplesObjC/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Examples/SamplesObjC/SamplesObjC/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

Examples/SamplesObjC/SamplesObjC/Base.lproj/Main.storyboard

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

Examples/SamplesObjC/SamplesObjC/Info.plist

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

Examples/SamplesObjC/SamplesObjC/SamplesObjC-Bridging-Header.h

@@ -0,0 +1,3 @@
+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//

Examples/SamplesObjC/SamplesObjC/ViewController.h

@@ -0,0 +1,13 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+#import <UIKit/UIKit.h>
+@import FloatingPanel;
+
+@interface ViewController : UIViewController
+@end
+
+@interface MyFloatingPanelLayout : NSObject <FloatingPanelLayout>
+@end
+
+@interface MyFloatingPanelBehavior : NSObject <FloatingPanelBehavior>
+@end

Examples/SamplesObjC/SamplesObjC/ViewController.m

@@ -0,0 +1,97 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+#import "ViewController.h"
+@import FloatingPanel;
+
+// Defining a custom FloatingPanelState
+@interface FloatingPanelState(Extended)
++ (FloatingPanelState *)LastQuart;
+@end
+
+@implementation FloatingPanelState(Extended)
+static FloatingPanelState *_lastQuart;
++ (FloatingPanelState *)LastQuart {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        _lastQuart = [[FloatingPanelState alloc] initWithRawValue:@"lastquart" order:750];
+    });
+    return _lastQuart;
+}
+@end
+
+@interface ViewController()<FloatingPanelControllerDelegate>
+@end
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+
+    FloatingPanelController *fpc = [[FloatingPanelController alloc] init];
+    [fpc setContentViewController:nil];
+    [fpc trackScrollView:nil];
+    [fpc setDelegate:self];
+
+    [fpc setLayout: [MyFloatingPanelLayout new]];
+    [fpc setBehavior:[MyFloatingPanelBehavior new]];
+    [fpc setRemovalInteractionEnabled:NO];
+
+    [fpc addPanelToParent:self at:self.view.subviews.count animated:NO completion:nil];
+    [fpc moveToState:FloatingPanelState.Tip animated:true completion:nil];
+
+    [self updateAppearance: fpc];
+}
+
+- (id<FloatingPanelLayout>)floatingPanel:(FloatingPanelController *)vc layoutFor:(UITraitCollection *)newCollection {
+    FloatingPanelBottomLayout *layout = [FloatingPanelBottomLayout new];
+    return layout;
+}
+
+- (void)updateAppearance: (FloatingPanelController*)fpc
+{
+    FloatingPanelSurfaceAppearance *appearance = [[FloatingPanelSurfaceAppearance alloc] init];
+    appearance.backgroundColor = [UIColor clearColor];
+    appearance.cornerRadius = 23.0;
+    if (@available(iOS 13.0, *)) {
+        fpc.surfaceView.containerView.layer.cornerCurve = kCACornerCurveContinuous;
+    }
+    FloatingPanelSurfaceAppearanceShadow *shadow = [[FloatingPanelSurfaceAppearanceShadow alloc] init];
+    shadow.color = [UIColor redColor];
+    shadow.radius = 10.0;
+    shadow.spread = 10.0;
+    FloatingPanelSurfaceAppearanceShadow *shadow2 = [[FloatingPanelSurfaceAppearanceShadow alloc] init];
+    shadow2.color = [UIColor blueColor];
+    shadow2.radius = 10.0;
+    shadow2.spread = 10.0;
+
+    appearance.shadows = @[shadow, shadow2];
+    fpc.surfaceView.appearance = appearance;
+}
+@end
+
+@implementation  MyFloatingPanelLayout
+- (FloatingPanelState *)initialState {
+    return FloatingPanelState.Half;
+}
+- (NSDictionary<FloatingPanelState *, id<FloatingPanelLayoutAnchoring>> *)anchors {
+    return @{
+        FloatingPanelState.LastQuart: [[FloatingPanelLayoutAnchor alloc] initWithFractionalInset:0.25
+                                                                                       edge:FloatingPanelReferenceEdgeTop
+                                                                             referenceGuide:FloatingPanelLayoutReferenceGuideSafeArea],
+        FloatingPanelState.Half: [[FloatingPanelLayoutAnchor alloc] initWithFractionalInset:0.5
+                                                                                       edge:FloatingPanelReferenceEdgeTop
+                                                                             referenceGuide:FloatingPanelLayoutReferenceGuideSafeArea],
+        FloatingPanelState.Tip: [[FloatingPanelLayoutAnchor alloc] initWithAbsoluteInset:44.0
+                                                                                    edge:FloatingPanelReferenceEdgeBottom
+                                                                          referenceGuide:FloatingPanelLayoutReferenceGuideSafeArea],
+    };
+}
+
+- (enum FloatingPanelPosition)position {
+    return FloatingPanelPositionBottom;
+}
+@end
+
+
+@implementation MyFloatingPanelBehavior
+@end

Examples/SamplesObjC/SamplesObjC/main.m

@@ -0,0 +1,10 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+    }
+}

Examples/Stocks/Stocks.xcodeproj/project.pbxproj

@@ -7,13 +7,13 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		5433F24B21717EA300BDAA5D /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 5433F24A21717EA300BDAA5D /* FloatingPanel.framework */; };
-		5433F24C21717EA300BDAA5D /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 5433F24A21717EA300BDAA5D /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		548DF95421705BE00041922A /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 548DF95321705BE00041922A /* AppDelegate.swift */; };
 		548DF95621705BE00041922A /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 548DF95521705BE00041922A /* ViewController.swift */; };
 		548DF95921705BE00041922A /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95721705BE00041922A /* Main.storyboard */; };
 		548DF95B21705BE10041922A /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95A21705BE10041922A /* Assets.xcassets */; };
 		548DF95E21705BE10041922A /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95C21705BE10041922A /* LaunchScreen.storyboard */; };
+		549D23CF233C77CF008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */; };
+		549D23D0233C77CF008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -23,7 +23,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				5433F24C21717EA300BDAA5D /* FloatingPanel.framework in Embed Frameworks */,
+				549D23D0233C77CF008EF4D7 /* FloatingPanel.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -31,7 +31,6 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
-		5433F24A21717EA300BDAA5D /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		548DF95021705BE00041922A /* Stocks.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Stocks.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		548DF95321705BE00041922A /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		548DF95521705BE00041922A /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -39,6 +38,7 @@
 		548DF95A21705BE10041922A /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		548DF95D21705BE10041922A /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		548DF95F21705BE10041922A /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -46,7 +46,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				5433F24B21717EA300BDAA5D /* FloatingPanel.framework in Frameworks */,
+				549D23CF233C77CF008EF4D7 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -56,7 +56,7 @@
 		548DF94721705BE00041922A = {
 			isa = PBXGroup;
 			children = (
-				5433F24A21717EA300BDAA5D /* FloatingPanel.framework */,
+				549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */,
 				548DF95221705BE00041922A /* Stocks */,
 				548DF95121705BE00041922A /* Products */,
 			);
@@ -312,7 +312,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Stocks;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -331,7 +331,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Stocks;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;

Examples/Stocks/Stocks/AppDelegate.swift

@@ -1,10 +1,4 @@
-//
-//  AppDelegate.swift
-//  Stocks
-//
-//  Created by Shin Yamamoto on 2018/10/12.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import UIKit
 

Examples/Stocks/Stocks/ViewController.swift

@@ -1,10 +1,4 @@
-//
-//  ViewController.swift
-//  Stocks
-//
-//  Created by Shin Yamamoto on 2018/10/12.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import UIKit
 import FloatingPanel
@@ -18,19 +12,21 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
     var newsVC: NewsViewController!
 
     var initialColor: UIColor = .black
+
     override func viewDidLoad() {
         super.viewDidLoad()
         initialColor = view.backgroundColor!
         // Initialize FloatingPanelController
         fpc = FloatingPanelController()
         fpc.delegate = self
+        fpc.behavior = FloatingPanelStocksBehavior()
 
         // Initialize FloatingPanelController and add the view
         fpc.surfaceView.backgroundColor = UIColor(displayP3Red: 30.0/255.0, green: 30.0/255.0, blue: 30.0/255.0, alpha: 1.0)
-        fpc.surfaceView.cornerRadius = 24.0
-        fpc.surfaceView.shadowHidden = true
-        fpc.surfaceView.borderWidth = 1.0 / traitCollection.displayScale
-        fpc.surfaceView.borderColor = UIColor.black.withAlphaComponent(0.2)
+        fpc.surfaceView.appearance.cornerRadius = 24.0
+        fpc.surfaceView.appearance.shadows = []
+        fpc.surfaceView.appearance.borderWidth = 1.0 / traitCollection.displayScale
+        fpc.surfaceView.appearance.borderColor = UIColor.black.withAlphaComponent(0.2)
 
         newsVC = storyboard?.instantiateViewController(withIdentifier: "News") as? NewsViewController
 
@@ -38,7 +34,7 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
         fpc.set(contentViewController: newsVC)
         fpc.track(scrollView: newsVC.scrollView)
 
-        fpc.addPanel(toParent: self, belowView: bottomToolView, animated: false)
+        fpc.addPanel(toParent: self, at: view.subviews.firstIndex(of: bottomToolView) ?? -1 , animated: false)
 
         topBannerView.frame = .zero
         topBannerView.alpha = 0.0
@@ -50,46 +46,46 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
             ])
     }
 
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-    }
-
-    override func viewDidDisappear(_ animated: Bool) {
-        super.viewDidDisappear(animated)
-    }
-
     override var preferredStatusBarStyle: UIStatusBarStyle {
         return .lightContent
     }
 
     // MARK: FloatingPanelControllerDelegate
 
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
         return FloatingPanelStocksLayout()
     }
 
-    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
-        return FloatingPanelStocksBehavior()
-    }
+    func floatingPanelDidMove(_ vc: FloatingPanelController) {
+        if vc.isAttracting == false {
+            let loc = vc.surfaceLocation
+            let minY = vc.surfaceLocation(for: .full).y
+            let maxY = vc.surfaceLocation(for: .tip).y
+            vc.surfaceLocation = CGPoint(x: loc.x, y: min(max(loc.y, minY), maxY))
+        }
 
-    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
-        if vc.position == .full {
-            // Dimiss top bar with dissolve animation
-            UIView.animate(withDuration: 0.25) {
-                self.topBannerView.alpha = 0.0
-                self.labelStackView.alpha = 1.0
-                self.view.backgroundColor = self.initialColor
-            }
+        if vc.surfaceLocation.y <= vc.surfaceLocation(for: .full).y + 100 {
+            showStockTickerBanner()
+        } else {
+            hideStockTickerBanner()
         }
     }
-    func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {
-        if targetPosition == .full {
-            // Present top bar with dissolve animation
-            UIView.animate(withDuration: 0.25) {
-                self.topBannerView.alpha = 1.0
-                self.labelStackView.alpha = 0.0
-                self.view.backgroundColor = .black
-            }
+
+    private func showStockTickerBanner() {
+        // Present top bar with dissolve animation
+        UIView.animate(withDuration: 0.25) {
+            self.topBannerView.alpha = 1.0
+            self.labelStackView.alpha = 0.0
+            self.view.backgroundColor = .black
+        }
+    }
+
+    private func hideStockTickerBanner() {
+        // Dimiss top bar with dissolve animation
+        UIView.animate(withDuration: 0.25) {
+            self.topBannerView.alpha = 0.0
+            self.labelStackView.alpha = 1.0
+            self.view.backgroundColor = .black
         }
     }
 }
@@ -99,56 +95,29 @@ class NewsViewController: UIViewController {
 }
 
 
-// MARK: My custom layout
+// MARK: - FloatingPanelLayout
 
 class FloatingPanelStocksLayout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .tip
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .tip
+
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 56.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 262.0, edge: .bottom, referenceGuide: .safeArea),
+             /* Visible + ToolView */
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 85.0 + 44.0, edge: .bottom, referenceGuide: .safeArea),
+        ]
     }
 
-    var topInteractionBuffer: CGFloat { return 0.0 }
-    var bottomInteractionBuffer: CGFloat { return 0.0 }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 56.0
-        case .half: return 262.0
-        case .tip: return 85.0 + 44.0 // Visible + ToolView
-        }
-    }
-
-    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat {
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0
     }
 }
 
-// MARK: My custom behavior
+// MARK: - FloatingPanelBehavior
 
 class FloatingPanelStocksBehavior: FloatingPanelBehavior {
-    var velocityThreshold: CGFloat {
-        return 15.0
-    }
-
-    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
-        let timing = timeingCurve(to: targetPosition, with: velocity)
-        return UIViewPropertyAnimator(duration: 0, timingParameters: timing)
-    }
-
-    private func timeingCurve(to: FloatingPanelPosition, with velocity: CGVector) -> UITimingCurveProvider {
-        let damping = self.damping(with: velocity)
-        return UISpringTimingParameters(dampingRatio: damping,
-                                        frequencyResponse: 0.4,
-                                        initialVelocity: velocity)
-    }
-
-    private func damping(with velocity: CGVector) -> CGFloat {
-        switch velocity.dy {
-        case ...(-velocityThreshold):
-            return 0.7
-        case velocityThreshold...:
-            return 0.7
-        default:
-            return 1.0
-        }
-    }
+    let springDecelerationRate: CGFloat = UIScrollView.DecelerationRate.fast.rawValue
+    let springResponseTime: CGFloat = 0.25
 }

FloatingPanel.podspec

@@ -1,24 +1,22 @@
 Pod::Spec.new do |s|
 
   s.name                = "FloatingPanel"
-  s.version             = "1.2.1"
+  s.version             = "2.5.0"
   s.summary             = "FloatingPanel is a clean and easy-to-use UI component of a floating panel interface."
   s.description         = <<-DESC
 FloatingPanel is a clean and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app.
 The new interface displays the related contents and utilities in parallel as a user wants.
                    DESC
   s.homepage            = "https://github.com/SCENEE/FloatingPanel"
-  # s.screenshots       = ""
+  s.author              = "Shin Yamamoto"
+  s.social_media_url    = "https://twitter.com/scenee"
 
   s.platform            = :ios, "10.0"
-  s.source              = { :git => "https://github.com/SCENEE/FloatingPanel.git", :tag => "v#{s.version}" }
-  s.source_files        = "Framework/Sources/*.swift"
-  s.swift_version       = "4.2"
-  s.pod_target_xcconfig = { 'SWIFT_WHOLE_MODULE_OPTIMIZATION' => 'YES', 'APPLICATION_EXTENSION_API_ONLY' => 'YES' }
+  s.source              = { :git => "https://github.com/SCENEE/FloatingPanel.git", :tag => s.version.to_s }
+  s.source_files        = "Sources/*.swift"
+  s.swift_versions      = ['5.1', '5.2', '5.3']
 
   s.framework           = "UIKit"
 
-  s.author              = { "Shin Yamamoto" => "shin@scenee.com" }
   s.license             = { :type => "MIT", :file => "LICENSE" }
-  s.social_media_url    = "https://twitter.com/scenee"
 end

FloatingPanel.xcodeproj/project.pbxproj

@@ -0,0 +1,819 @@
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FloatingPanel.xcodeproj/xcshareddata/IDETemplateMacros.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>FILEHEADER</key>
+	<string> Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.</string>
+</dict>
+</plist>

FloatingPanel.xcodeproj/xcshareddata/xcschemes/FloatingPanel.xcscheme

@@ -23,12 +23,33 @@
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       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
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+            parallelizable = "YES"
+            testExecutionOrdering = "random">
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+               BlueprintIdentifier = "545DB9C92151169500CA77B8"
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+               BlueprintName = "FloatingPanelTests"
+               ReferencedContainer = "container:FloatingPanel.xcodeproj">
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+         </TestableReference>
       </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "545DB9C02151169500CA77B8"
+            BuildableName = "FloatingPanel.framework"
+            BlueprintName = "FloatingPanel"
+            ReferencedContainer = "container:FloatingPanel.xcodeproj">
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+      </MacroExpansion>
       <AdditionalOptions>
       </AdditionalOptions>
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FloatingPanel.xcworkspace/contents.xcworkspacedata

@@ -4,16 +4,15 @@
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       location = "group:README.md">
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-      name = "Framework">
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+      location = "group:FloatingPanel.xcodeproj">
+   </FileRef>
    <Group
       location = "group:Examples"
       name = "Examples">
+      <FileRef
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+      </FileRef>
       <FileRef
          location = "group:Maps/Maps.xcodeproj">
       </FileRef>
@@ -23,5 +22,8 @@
       <FileRef
          location = "group:Samples/Samples.xcodeproj">
       </FileRef>
+      <FileRef
+         location = "group:SamplesObjC/SamplesObjC.xcodeproj">
+      </FileRef>
    </Group>
 </Workspace>

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Framework/Sources/FloatingPanel.swift

@@ -1,785 +0,0 @@
-//
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-///
-/// FloatingPanel presentation model
-///
-class FloatingPanel: NSObject, UIGestureRecognizerDelegate, UIScrollViewDelegate {
-    /* Cause 'terminating with uncaught exception of type NSException' error on Swift Playground
-     unowned let view: UIView
-     */
-    let surfaceView: FloatingPanelSurfaceView
-    let backdropView: FloatingPanelBackdropView
-    var layoutAdapter: FloatingPanelLayoutAdapter
-    var behavior: FloatingPanelBehavior
-
-    weak var scrollView: UIScrollView? {
-        didSet {
-            guard let scrollView = scrollView else { return }
-            scrollView.panGestureRecognizer.addTarget(self, action: #selector(handle(panGesture:)))
-            scrollBouncable = scrollView.bounces
-            scrollIndictorVisible = scrollView.showsVerticalScrollIndicator
-        }
-    }
-    weak var userScrollViewDelegate: UIScrollViewDelegate?
-
-    var safeAreaInsets: UIEdgeInsets! {
-        get { return layoutAdapter.safeAreaInsets }
-        set { layoutAdapter.safeAreaInsets = newValue }
-    }
-
-    unowned let viewcontroller: FloatingPanelController
-
-    private(set) var state: FloatingPanelPosition = .tip {
-        didSet { viewcontroller.delegate?.floatingPanelDidChangePosition(viewcontroller) }
-    }
-
-    private var isBottomState: Bool {
-        let remains = layoutAdapter.layout.supportedPositions.filter { $0.rawValue > state.rawValue }
-        return remains.count == 0
-    }
-
-    let panGesture: FloatingPanelPanGestureRecognizer
-    var isRemovalInteractionEnabled: Bool = false
-
-    private var animator: UIViewPropertyAnimator?
-    private var initialFrame: CGRect = .zero
-    private var initialScrollOffset: CGPoint = .zero
-    private var transOffsetY: CGFloat = 0
-    private var interactionInProgress: Bool = false
-
-    // Scroll handling
-    private var stopScrollDeceleration: Bool = false
-    private var scrollBouncable = false
-    private var scrollIndictorVisible = false
-
-    // MARK: - Interface
-
-    init(_ vc: FloatingPanelController, layout: FloatingPanelLayout, behavior: FloatingPanelBehavior) {
-        viewcontroller = vc
-        surfaceView = vc.view as! FloatingPanelSurfaceView
-        backdropView = FloatingPanelBackdropView()
-        backdropView.backgroundColor = .black
-        backdropView.alpha = 0.0
-
-        self.layoutAdapter = FloatingPanelLayoutAdapter(surfaceView: surfaceView,
-                                                        backdropView: backdropView,
-                                                        layout: layout)
-        self.behavior = behavior
-
-        state = layoutAdapter.layout.initialPosition
-
-        panGesture = FloatingPanelPanGestureRecognizer()
-
-        if #available(iOS 11.0, *) {
-            panGesture.name = "FloatingPanelSurface"
-        }
-
-        super.init()
-
-        surfaceView.addGestureRecognizer(panGesture)
-        panGesture.addTarget(self, action: #selector(handle(panGesture:)))
-        panGesture.delegate = self
-    }
-
-    func setUpViews(in vc: UIViewController) {
-        unowned let view = vc.view!
-
-        view.insertSubview(backdropView, belowSubview: surfaceView)
-        backdropView.frame = view.bounds
-
-        layoutAdapter.prepareLayout(toParent: vc)
-    }
-
-    func move(to: FloatingPanelPosition, animated: Bool, completion: (() -> Void)? = nil) {
-        move(from: state, to: to, animated: animated, completion: completion)
-    }
-
-    func present(animated: Bool, completion: (() -> Void)? = nil) {
-        self.layoutAdapter.activateLayout(of: nil)
-        move(from: nil, to: layoutAdapter.layout.initialPosition, animated: animated, completion: completion)
-    }
-
-    func dismiss(animated: Bool, completion: (() -> Void)? = nil) {
-        move(from: state, to: nil, animated: animated, completion: completion)
-    }
-
-    private func move(from: FloatingPanelPosition?, to: FloatingPanelPosition?, animated: Bool, completion: (() -> Void)? = nil) {
-        if to != .full {
-            lockScrollView()
-        }
-
-        if animated {
-            let animator: UIViewPropertyAnimator
-            switch (from, to) {
-            case (nil, let to?):
-                animator = behavior.addAnimator(self.viewcontroller, to: to)
-            case (let from?, let to?):
-                animator = behavior.moveAnimator(self.viewcontroller, from: from, to: to)
-            case (let from?, nil):
-                animator = behavior.removeAnimator(self.viewcontroller, from: from)
-            case (nil, nil):
-                fatalError()
-            }
-
-            animator.addAnimations { [weak self] in
-                guard let self = self else { return }
-
-                self.updateLayout(to: to)
-                if let to = to {
-                    self.state = to
-                }
-            }
-            animator.addCompletion { _ in
-                completion?()
-            }
-            animator.startAnimation()
-        } else {
-            self.updateLayout(to: to)
-            if let to = to {
-                self.state = to
-            }
-            completion?()
-        }
-    }
-
-    // MARK: - Layout update
-
-    private func updateLayout(to target: FloatingPanelPosition?) {
-        self.layoutAdapter.activateLayout(of: target)
-    }
-
-    private func getBackdropAlpha(with translation: CGPoint) -> CGFloat {
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-
-        let next = directionalPosition(with: translation)
-        let pre = redirectionalPosition(with: translation)
-        let nextY = layoutAdapter.positionY(for: next)
-        let preY = layoutAdapter.positionY(for: pre)
-
-        let nextAlpha = layoutAdapter.layout.backdropAlphaFor(position: next)
-        let preAlpha = layoutAdapter.layout.backdropAlphaFor(position: pre)
-
-        if preY == nextY {
-            return preAlpha
-        } else {
-            return preAlpha + max(min(1.0, 1.0 - (nextY - currentY) / (nextY - preY) ), 0.0) * (nextAlpha - preAlpha)
-        }
-    }
-
-    // MARK: - UIGestureRecognizerDelegate
-
-    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
-                                  shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
-        guard gestureRecognizer == panGesture else { return false }
-
-        /* log.debug("shouldRecognizeSimultaneouslyWith", otherGestureRecognizer) */
-
-        // all gestures of the tracking scroll view should be recognized in parallel
-        // and handle them in self.handle(panGesture:)
-        return scrollView?.gestureRecognizers?.contains(otherGestureRecognizer) ?? false
-    }
-
-    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
-        guard gestureRecognizer == panGesture else { return false }
-
-        /* log.debug("shouldBeRequiredToFailBy", otherGestureRecognizer) */
-
-        // The tracking scroll view's gestures should begin without waiting for the pan gesture failure.
-        // `scrollView.gestureRecognizers` can contains the following gestures
-        // * UIScrollViewDelayedTouchesBeganGestureRecognizer
-        // * UIScrollViewPanGestureRecognizer (scrollView.panGestureRecognizer)
-        // * _UIDragAutoScrollGestureRecognizer
-        // * _UISwipeActionPanGestureRecognizer
-        // * UISwipeDismissalGestureRecognizer
-        if let scrollView = scrollView,
-            let scrollGestureRecognizers = scrollView.gestureRecognizers,
-            scrollGestureRecognizers.contains(otherGestureRecognizer) {
-            return false
-        }
-
-        // Long press gesture should begin without waiting for the pan gesture failure.
-        if otherGestureRecognizer is UILongPressGestureRecognizer {
-            return false
-        }
-
-        // Do not begin any other gestures until the pan gesture fails.
-        return true
-    }
-
-    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
-        guard gestureRecognizer == panGesture else { return false }
-
-        log.debug("shouldRequireFailureOf", otherGestureRecognizer)
-
-        // Should begin the pan gesture without waiting for the tracking scroll view's gestures.
-        // `scrollView.gestureRecognizers` can contains the following gestures
-        // * UIScrollViewDelayedTouchesBeganGestureRecognizer
-        // * UIScrollViewPanGestureRecognizer (scrollView.panGestureRecognizer)
-        // * _UIDragAutoScrollGestureRecognizer
-        // * _UISwipeActionPanGestureRecognizer
-        // * UISwipeDismissalGestureRecognizer
-        if let scrollView = scrollView {
-            // On short contents scroll, `_UISwipeActionPanGestureRecognizer` blocks
-            // the panel's pan gesture if not returns false
-            if let scrollGestureRecognizers = scrollView.gestureRecognizers,
-                scrollGestureRecognizers.contains(otherGestureRecognizer) {
-                return false
-            }
-        }
-
-        switch otherGestureRecognizer {
-        case is UIPanGestureRecognizer,
-             is UISwipeGestureRecognizer,
-             is UIRotationGestureRecognizer,
-             is UIScreenEdgePanGestureRecognizer,
-             is UIPinchGestureRecognizer:
-            // Do not begin the pan gesture until these gestures fail
-            return true
-        default:
-            // Should begin the pan gesture witout waiting tap/long press gestures fail
-            return false
-        }
-    }
-
-    // MARK: - Gesture handling
-    private let offsetThreshold: CGFloat = 5.0 // Optimal value from testing
-    @objc func handle(panGesture: UIPanGestureRecognizer) {
-        log.debug("Gesture >>>>", panGesture)
-        let velocity = panGesture.velocity(in: panGesture.view)
-
-        switch panGesture {
-        case scrollView?.panGestureRecognizer:
-            guard let scrollView = scrollView else { return }
-
-            log.debug("SrollPanGesture ScrollView.contentOffset >>>", scrollView.contentOffset.y, scrollView.contentSize, scrollView.bounds.size)
-
-            // Prevent scoll slip by the top bounce when the scroll view's height is
-            // less than the content's height
-            if scrollView.isDecelerating == false, scrollView.contentSize.height > scrollView.bounds.height {
-                scrollView.bounces = (scrollView.contentOffset.y > offsetThreshold)
-            }
-
-            if surfaceView.frame.minY > layoutAdapter.topY {
-                switch state {
-                case .full:
-                    // Prevent over scrolling from scroll top in moving the panel from full.
-                    scrollView.contentOffset.y = scrollView.contentOffsetZero.y
-                case .half, .tip:
-                    guard scrollView.isDecelerating == false else {
-                        // Don't fix the scroll offset in animating the panel to half and tip.
-                        // It causes a buggy scrolling deceleration because `state` becomes
-                        // a target position in animating the panel on the interaction from full.
-                        return
-                    }
-                    // Fix the scroll offset in moving the panel from half and tip.
-                    scrollView.contentOffset.y = initialScrollOffset.y
-                }
-
-                // Always hide a scroll indicator at the non-top.
-                if interactionInProgress {
-                    lockScrollView()
-                }
-            } else {
-                // Always show a scroll indicator at the top.
-                if interactionInProgress {
-                    unlockScrollView()
-                }
-            }
-        case panGesture:
-            let translation = panGesture.translation(in: panGesture.view!.superview)
-            let location = panGesture.location(in: panGesture.view)
-
-            log.debug(panGesture.state, ">>>", "translation: \(translation.y), velocity: \(velocity.y)")
-
-            if shouldScrollViewHandleTouch(scrollView, point: location, velocity: velocity) {
-                return
-            }
-
-            if let animator = self.animator {
-                animator.stopAnimation(true)
-                self.animator = nil
-            }
-
-            switch panGesture.state {
-            case .began:
-                panningBegan()
-            case .changed:
-                if interactionInProgress == false {
-                    startInteraction(with: translation)
-                }
-                panningChange(with: translation)
-            case .ended, .cancelled, .failed:
-                panningEnd(with: translation, velocity: velocity)
-            case .possible:
-                break
-            }
-        default:
-            return
-        }
-    }
-
-    private func shouldScrollViewHandleTouch(_ scrollView: UIScrollView?, point: CGPoint, velocity: CGPoint) -> Bool {
-        let grabberBarFrame = CGRect(x: surfaceView.bounds.origin.x,
-                                     y: surfaceView.bounds.origin.y,
-                                     width: surfaceView.bounds.width,
-                                     height: FloatingPanelSurfaceView.topGrabberBarHeight * 2)
-
-        // When no scrollView, nothing to handle.
-        guard let scrollView = scrollView else { return false }
-
-        // For _UISwipeActionPanGestureRecognizer
-        if let scrollGestureRecognizers = scrollView.gestureRecognizers {
-            for gesture in scrollGestureRecognizers {
-                guard gesture.state == .began || gesture.state == .changed
-                else { continue }
-
-                if gesture !=  scrollView.panGestureRecognizer {
-                    return true
-                }
-            }
-        }
-
-        guard
-            state == .full,                   // When not .full, don't scroll.
-            interactionInProgress == false,   // When interaction already in progress, don't scroll.
-            scrollView.frame.contains(point), // When point not in scrollView, don't scroll.
-            !grabberBarFrame.contains(point)  // When point within grabber area, don't scroll.
-        else {
-            return false
-        }
-
-        log.debug("ScrollView.contentOffset >>>", scrollView.contentOffset.y)
-
-        let offset = scrollView.contentOffset.y - scrollView.contentOffsetZero.y
-        if  abs(offset) > offsetThreshold {
-            return true
-        }
-        if scrollView.isDecelerating {
-            return true
-        }
-        if velocity.y < 0 {
-            return true
-        }
-
-        return false
-    }
-
-    private func panningBegan() {
-        // A user interaction does not always start from Began state of the pan gesture
-        // because it can be recognized in scrolling a content in a content view controller.
-        // So do nothing here.
-        log.debug("panningBegan")
-    }
-
-    private func panningChange(with translation: CGPoint) {
-        log.debug("panningChange")
-
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-
-        var frame = initialFrame
-        frame.origin.y = currentY
-        surfaceView.frame = frame
-        backdropView.alpha = getBackdropAlpha(with: translation)
-
-        viewcontroller.delegate?.floatingPanelDidMove(viewcontroller)
-    }
-
-    private func panningEnd(with translation: CGPoint, velocity: CGPoint) {
-        log.debug("panningEnd")
-        if interactionInProgress == false {
-            initialFrame = surfaceView.frame
-        }
-
-        stopScrollDeceleration = (surfaceView.frame.minY > layoutAdapter.topY) // Projecting the dragging to the scroll dragging or not
-
-        let targetPosition = self.targetPosition(with: translation, velocity: velocity)
-        let distance = self.distance(to: targetPosition, with: translation)
-
-        endInteraction(for: targetPosition)
-
-        if isRemovalInteractionEnabled, isBottomState {
-            if startRemovalAnimation(with: translation, velocity: velocity, distance: distance) {
-                return
-            }
-        }
-
-        viewcontroller.delegate?.floatingPanelDidEndDragging(viewcontroller, withVelocity: velocity, targetPosition: targetPosition)
-        viewcontroller.delegate?.floatingPanelWillBeginDecelerating(viewcontroller)
-
-        startAnimation(to: targetPosition, at: distance, with: velocity)
-    }
-
-    private func startRemovalAnimation(with translation: CGPoint, velocity: CGPoint, distance: CGFloat) -> Bool {
-        let posY = layoutAdapter.positionY(for: state)
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-        let safeAreaBottomY = layoutAdapter.safeAreaBottomY
-        let vth = behavior.removalVelocity
-        let pth = max(min(behavior.removalProgress, 1.0), 0.0)
-        let velocityVector = (distance != 0) ? CGVector(dx: 0, dy: max(min(velocity.y/distance, vth), 0.0)) : .zero
-
-        guard (safeAreaBottomY - posY) != 0 else { return false }
-        guard (currentY - posY) / (safeAreaBottomY - posY) >= pth || velocityVector.dy == vth else { return false }
-
-        viewcontroller.delegate?.floatingPanelDidEndDraggingToRemove(viewcontroller, withVelocity: velocity)
-        let animator = self.behavior.removalInteractionAnimator(self.viewcontroller, with: velocityVector)
-        animator.addAnimations { [weak self] in
-            guard let self = self else { return }
-            self.updateLayout(to: nil)
-        }
-        animator.addCompletion({ [weak self] (_) in
-            guard let self = self else { return }
-            self.viewcontroller.removePanelFromParent(animated: false)
-            self.viewcontroller.delegate?.floatingPanelDidEndRemove(self.viewcontroller)
-        })
-        animator.startAnimation()
-        return true
-    }
-
-    private func startInteraction(with translation: CGPoint) {
-        /* Don't lock a scroll view to show a scroll indicator after hitting the top */
-        log.debug("startInteraction")
-        initialFrame = surfaceView.frame
-        if let scrollView = scrollView {
-            initialScrollOffset = scrollView.contentOffset
-        }
-        transOffsetY = translation.y
-
-        viewcontroller.delegate?.floatingPanelWillBeginDragging(viewcontroller)
-
-        interactionInProgress = true
-    }
-
-    private func endInteraction(for targetPosition: FloatingPanelPosition) {
-        log.debug("endInteraction for \(targetPosition)")
-        interactionInProgress = false
-
-        // Prevent to keep a scoll view indicator visible at the half/tip position
-        if targetPosition != .full {
-            lockScrollView()
-        }
-    }
-
-    private func getCurrentY(from rect: CGRect, with translation: CGPoint) -> CGFloat {
-        let dy = translation.y - transOffsetY
-        let y = rect.offsetBy(dx: 0.0, dy: dy).origin.y
-
-        let topY = layoutAdapter.topY
-        let topBuffer = layoutAdapter.layout.topInteractionBuffer
-        let bottomY = layoutAdapter.bottomY
-        let bottomBuffer = layoutAdapter.layout.bottomInteractionBuffer
-
-        if let scrollView = scrollView, scrollView.panGestureRecognizer.state == .changed {
-            let preY = surfaceView.frame.origin.y
-            if preY > 0 && preY > y {
-                return max(topY, min(bottomY, y))
-            }
-        }
-        return max(topY - topBuffer, min(bottomY + bottomBuffer, y))
-    }
-
-    private func startAnimation(to targetPosition: FloatingPanelPosition, at distance: CGFloat, with velocity: CGPoint) {
-        let targetY = layoutAdapter.positionY(for: targetPosition)
-        let velocityVector = (distance != 0) ? CGVector(dx: 0, dy: max(min(velocity.y/distance, 30.0), -30.0)) : .zero
-        let animator = behavior.interactionAnimator(self.viewcontroller, to: targetPosition, with: velocityVector)
-        animator.addAnimations { [weak self] in
-            guard let self = self else { return }
-            if self.state == targetPosition {
-                self.surfaceView.frame.origin.y = targetY
-                self.layoutAdapter.setBackdropAlpha(of: targetPosition)
-            } else {
-                self.updateLayout(to: targetPosition)
-            }
-            self.state = targetPosition
-        }
-        animator.addCompletion { [weak self] pos in
-            guard let self = self else { return }
-            guard
-                self.interactionInProgress == false,
-                animator == self.animator,
-                pos == .end
-                else { return }
-            self.finishAnimation(at: targetPosition)
-        }
-        animator.startAnimation()
-        self.animator = animator
-    }
-
-    private func finishAnimation(at targetPosition: FloatingPanelPosition) {
-        log.debug("finishAnimation \(targetPosition)")
-        self.animator = nil
-        self.viewcontroller.delegate?.floatingPanelDidEndDecelerating(self.viewcontroller)
-
-        stopScrollDeceleration = false
-        // Don't unlock scroll view in animating view when presentation layer != model layer
-        if targetPosition == .full {
-            unlockScrollView()
-        }
-    }
-
-    private func distance(to targetPosition: FloatingPanelPosition, with translation: CGPoint) -> CGFloat {
-        let topY = layoutAdapter.topY
-        let middleY = layoutAdapter.middleY
-        let bottomY = layoutAdapter.bottomY
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-        switch targetPosition {
-        case .full:
-            return CGFloat(fabs(Double(currentY - topY)))
-        case .half:
-            return CGFloat(fabs(Double(currentY - middleY)))
-        case .tip:
-            return CGFloat(fabs(Double(currentY - bottomY)))
-        }
-    }
-
-    private func directionalPosition(with translation: CGPoint) -> FloatingPanelPosition {
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-
-        let supportedPositions: Set = layoutAdapter.layout.supportedPositions
-
-        if supportedPositions.count == 1 {
-            return state
-        }
-
-        switch supportedPositions {
-        case [.full, .half]: return translation.y >= 0 ? .half : .full
-        case [.half, .tip]: return translation.y >= 0 ? .tip : .half
-        case [.full, .tip]: return translation.y >= 0 ? .tip : .full
-        default:
-            let middleY = layoutAdapter.middleY
-
-            switch state {
-            case .full:
-                if translation.y <= 0 {
-                    return .full
-                }
-                return currentY > middleY ? .tip : .half
-            case .half:
-                return translation.y >= 0 ? .tip : .full
-            case .tip:
-                if translation.y >= 0 {
-                    return .tip
-                }
-                return currentY > middleY ? .half : .full
-            }
-        }
-    }
-
-    private func redirectionalPosition(with translation: CGPoint) -> FloatingPanelPosition {
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-
-        let supportedPositions: Set = layoutAdapter.layout.supportedPositions
-
-        if supportedPositions.count == 1 {
-            return state
-        }
-
-        switch supportedPositions {
-        case [.full, .half]: return translation.y >= 0 ? .full : .half
-        case [.half, .tip]: return translation.y >= 0 ? .half : .tip
-        case [.full, .tip]: return translation.y >= 0 ? .full : .tip
-        default:
-            let middleY = layoutAdapter.middleY
-
-            switch state {
-            case .full:
-                return currentY > middleY ? .half : .full
-            case .half:
-                return .half
-            case .tip:
-                return currentY > middleY ? .tip : .half
-            }
-        }
-    }
-
-    // Distance travelled after decelerating to zero velocity at a constant rate.
-    // Refer to the slides p176 of [Designing Fluid Interfaces](https://developer.apple.com/videos/play/wwdc2018/803/)
-    private func project(initialVelocity: CGFloat) -> CGFloat {
-        let decelerationRate = UIScrollView.DecelerationRate.normal.rawValue
-        return (initialVelocity / 1000.0) * decelerationRate / (1.0 - decelerationRate)
-    }
-
-    private func targetPosition(with translation: CGPoint, velocity: CGPoint) -> (FloatingPanelPosition) {
-        let currentY = getCurrentY(from: initialFrame, with: translation)
-        let supportedPositions: Set = layoutAdapter.layout.supportedPositions
-
-        if supportedPositions.count == 1 {
-            return state
-        }
-
-        switch supportedPositions {
-        case [.full, .half]:
-            return targetPosition(from: [.full, .half], at: currentY, velocity: velocity)
-        case [.half, .tip]:
-            return targetPosition(from: [.half, .tip], at: currentY, velocity: velocity)
-        case [.full, .tip]:
-            return targetPosition(from: [.full, .tip], at: currentY, velocity: velocity)
-        default:
-            /*
-             [topY|full]---[th1]---[middleY|half]---[th2]---[bottomY|tip]
-             */
-            let topY = layoutAdapter.topY
-            let middleY = layoutAdapter.middleY
-            let bottomY = layoutAdapter.bottomY
-
-            let target: FloatingPanelPosition
-            let forwardYDirection: Bool
-
-            switch state {
-            case .full:
-                target = .half
-                forwardYDirection = true
-            case .half:
-                if (currentY < middleY) {
-                    target = .full
-                    forwardYDirection = false
-                } else {
-                    target = .tip
-                    forwardYDirection = true
-                }
-            case .tip:
-                target = .half
-                forwardYDirection = false
-            }
-
-            let redirectionalProgress = max(min(behavior.redirectionalProgress(viewcontroller, from: state, to: target), 1.0), 0.0)
-
-            let th1: CGFloat
-            let th2: CGFloat
-
-            if forwardYDirection {
-                th1 = topY + (middleY - topY) * redirectionalProgress
-                th2 = middleY + (bottomY - middleY) * redirectionalProgress
-            } else {
-                th1 = middleY - (middleY - topY) * redirectionalProgress
-                th2 = bottomY - (bottomY - middleY) * redirectionalProgress
-            }
-
-            switch currentY {
-            case ..<th1:
-                if project(initialVelocity: velocity.y) >= (middleY - currentY) {
-                    return .half
-                } else {
-                    return .full
-                }
-            case ...middleY:
-                if project(initialVelocity: velocity.y) <= (topY - currentY) {
-                    return .full
-                } else {
-                    return .half
-                }
-            case ..<th2:
-                if project(initialVelocity: velocity.y) >= (bottomY - currentY) {
-                    return .tip
-                } else {
-                    return .half
-                }
-            default:
-                if project(initialVelocity: velocity.y) <= (middleY - currentY) {
-                    return .half
-                } else {
-                    return .tip
-                }
-            }
-        }
-    }
-
-    private func targetPosition(from positions: [FloatingPanelPosition], at currentY: CGFloat, velocity: CGPoint) -> FloatingPanelPosition {
-        assert(positions.count == 2)
-
-        let top = positions[0]
-        let bottom = positions[1]
-
-        let topY = layoutAdapter.positionY(for: top)
-        let bottomY = layoutAdapter.positionY(for: bottom)
-
-        let target = top == state ? bottom : top
-        let redirectionalProgress = max(min(behavior.redirectionalProgress(viewcontroller, from: state, to: target), 1.0), 0.0)
-
-        let th = topY + (bottomY - topY) * redirectionalProgress
-
-        switch currentY {
-        case ..<th:
-            if project(initialVelocity: velocity.y) >= (bottomY - currentY) {
-                return bottom
-            } else {
-                return top
-            }
-        default:
-            if project(initialVelocity: velocity.y) <= (topY - currentY) {
-                return top
-            } else {
-                return bottom
-            }
-        }
-    }
-
-    // MARK: - ScrollView handling
-
-    private func lockScrollView() {
-        guard let scrollView = scrollView else { return }
-
-        scrollView.isDirectionalLockEnabled = true
-        scrollView.bounces = false
-        scrollView.showsVerticalScrollIndicator = false
-    }
-
-    private func unlockScrollView() {
-        guard let scrollView = scrollView else { return }
-
-        scrollView.isDirectionalLockEnabled = false
-        scrollView.bounces = scrollBouncable
-        scrollView.showsVerticalScrollIndicator = scrollIndictorVisible
-    }
-
-
-    // MARK: - UIScrollViewDelegate Intermediation
-    override func responds(to aSelector: Selector!) -> Bool {
-        return super.responds(to: aSelector) || userScrollViewDelegate?.responds(to: aSelector) == true
-    }
-
-    override func forwardingTarget(for aSelector: Selector!) -> Any? {
-        if userScrollViewDelegate?.responds(to: aSelector) == true {
-            return userScrollViewDelegate
-        } else {
-            return super.forwardingTarget(for: aSelector)
-        }
-    }
-
-    func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
-        if state != .full {
-            initialScrollOffset = scrollView.contentOffset
-        }
-        userScrollViewDelegate?.scrollViewDidEndScrollingAnimation?(scrollView)
-    }
-
-    func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
-        if stopScrollDeceleration {
-            targetContentOffset.pointee = scrollView.contentOffset
-            stopScrollDeceleration = false
-        } else {
-            userScrollViewDelegate?.scrollViewWillEndDragging?(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
-        }
-    }
-}
-
-class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
-    override weak var delegate: UIGestureRecognizerDelegate? {
-        get {
-            return super.delegate
-        }
-        set {
-            guard newValue is FloatingPanel else {
-                let exception = NSException(name: .invalidArgumentException,
-                                            reason: "FloatingPanelController's built-in pan gesture recognizer must have its controller as its delegate.",
-                                            userInfo: nil)
-                exception.raise()
-                return
-            }
-            super.delegate = newValue
-        }
-    }
-}

Framework/Sources/FloatingPanelBackdropView.swift

@@ -1,9 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/26.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-/// A view that presents a backdrop interface behind a floating panel.
-public class FloatingPanelBackdropView: UIView { }

Framework/Sources/FloatingPanelBehavior.swift

@@ -1,108 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/10/03.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-public protocol FloatingPanelBehavior {
-    /// Returns the progress to redirect to the previous position
-    ///
-    /// The progress is represented by a floating-point value between 0.0 and 1.0, inclusive, where 1.0 indicates the floating panel is impossible to move to the next posiiton. The default value is 0.5. Values less than 0.0 and greater than 1.0 are pinned to those limits.
-    func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> CGFloat
-
-    /// Returns a UIViewPropertyAnimator object to project a floating panel to a position on finger up if the user dragged.
-    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator
-
-    /// Returns a UIViewPropertyAnimator object to add a floating panel to a position.
-    ///
-    /// Its animator instance will be used to animate the surface view in `FloatingPanelController.addPanel(toParent:belowView:animated:)`.
-    /// Default is an animator with ease-in-out curve and 0.25 sec duration.
-    func addAnimator(_ fpc: FloatingPanelController, to: FloatingPanelPosition) -> UIViewPropertyAnimator
-
-    /// Returns a UIViewPropertyAnimator object to remove a floating panel from a position.
-    ///
-    /// Its animator instance will be used to animate the surface view in `FloatingPanelController.removePanelFromParent(animated:completion:)`.
-    /// Default is an animator with ease-in-out curve and 0.25 sec duration.
-    func removeAnimator(_ fpc: FloatingPanelController, from: FloatingPanelPosition) -> UIViewPropertyAnimator
-
-    /// Returns a UIViewPropertyAnimator object to move a floating panel from a position to a position.
-    ///
-    /// Its animator instance will be used to animate the surface view in `FloatingPanelController.move(to:animated:completion:)`.
-    /// Default is an animator with ease-in-out curve and 0.25 sec duration.
-    func moveAnimator(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> UIViewPropertyAnimator
-
-    /// Returns a y-axis velocity to invoke a removal interaction at the bottom position.
-    ///
-    /// Default is 10.0. This method is called when FloatingPanelController.isRemovalInteractionEnabled is true.
-    var removalVelocity: CGFloat { get }
-
-    /// Returns the threshold of the transition to invoke a removal interaction at the bottom position.
-    ///
-    /// The progress is represented by a floating-point value between 0.0 and 1.0, inclusive, where 1.0 indicates the floating panel is impossible to invoke the removal interaction. The default value is 0.5. Values less than 0.0 and greater than 1.0 are pinned to those limits. This method is called when FloatingPanelController.isRemovalInteractionEnabled is true.
-    var removalProgress: CGFloat { get }
-
-    /// Returns a UIViewPropertyAnimator object to remove a floating panel with a velocity interactively at the bottom position.
-    ///
-    /// Default is a spring animator with 1.0 damping ratio. This method is called when FloatingPanelController.isRemovalInteractionEnabled is true.
-    func removalInteractionAnimator(_ fpc: FloatingPanelController, with velocity: CGVector) -> UIViewPropertyAnimator
-}
-
-public extension FloatingPanelBehavior {
-    func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> CGFloat {
-        return 0.5
-    }
-
-    func addAnimator(_ fpc: FloatingPanelController, to: FloatingPanelPosition) -> UIViewPropertyAnimator {
-        return UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
-    }
-
-    func removeAnimator(_ fpc: FloatingPanelController, from: FloatingPanelPosition) -> UIViewPropertyAnimator {
-        return UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
-    }
-
-    func moveAnimator(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> UIViewPropertyAnimator {
-        return UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
-    }
-
-    var removalVelocity: CGFloat {
-        return 10.0
-    }
-
-    var removalProgress: CGFloat {
-        return 0.5
-    }
-
-    func removalInteractionAnimator(_ fpc: FloatingPanelController, with velocity: CGVector) -> UIViewPropertyAnimator {
-        log.debug("velocity", velocity)
-        let timing = UISpringTimingParameters(dampingRatio: 1.0,
-                                        frequencyResponse: 0.3,
-                                        initialVelocity: velocity)
-        return UIViewPropertyAnimator(duration: 0, timingParameters: timing)
-    }
-}
-
-class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
-    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
-        let timing = timeingCurve(with: velocity)
-        return UIViewPropertyAnimator(duration: 0, timingParameters: timing)
-    }
-
-    private func timeingCurve(with velocity: CGVector) -> UITimingCurveProvider {
-        log.debug("velocity", velocity)
-        let damping = self.getDamping(with: velocity)
-        return UISpringTimingParameters(dampingRatio: damping,
-                                        frequencyResponse: 0.3,
-                                        initialVelocity: velocity)
-    }
-
-    private let velocityThreshold: CGFloat = 8.0
-    private func getDamping(with velocity: CGVector) -> CGFloat {
-        let dy = abs(velocity.dy)
-        if dy > velocityThreshold {
-            return 0.7
-        } else {
-            return 1.0
-        }
-    }
-}

Framework/Sources/FloatingPanelController.h

@@ -1,9 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-FOUNDATION_EXPORT double FloatingPanelVersionNumber;
-FOUNDATION_EXPORT const unsigned char FloatingPanelVersionString[];

Framework/Sources/FloatingPanelController.swift

@@ -1,393 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-public protocol FloatingPanelControllerDelegate: class {
-    // if it returns nil, FloatingPanelController uses the default layout
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout?
-
-    // if it returns nil, FloatingPanelController uses the default behavior
-    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior?
-
-    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) // changed the settled position in the model layer
-
-    func floatingPanelDidMove(_ vc: FloatingPanelController) // any offset changes
-
-    // called on start of dragging (may require some time and or distance to move)
-    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController)
-    // called on finger up if the user dragged. velocity is in points/second.
-    func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition)
-    func floatingPanelWillBeginDecelerating(_ vc: FloatingPanelController) // called on finger up as we are moving
-    func floatingPanelDidEndDecelerating(_ vc: FloatingPanelController) // called when scroll view grinds to a halt
-
-    // called on start of dragging to remove its views from a parent view controller
-    func floatingPanelDidEndDraggingToRemove(_ vc: FloatingPanelController, withVelocity velocity: CGPoint)
-    // called when its views are removed from a parent view controller
-    func floatingPanelDidEndRemove(_ vc: FloatingPanelController)
-}
-
-public extension FloatingPanelControllerDelegate {
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        return nil
-    }
-    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
-        return nil
-    }
-    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) {}
-    func floatingPanelDidMove(_ vc: FloatingPanelController) {}
-    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {}
-    func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {}
-    func floatingPanelWillBeginDecelerating(_ vc: FloatingPanelController) {}
-    func floatingPanelDidEndDecelerating(_ vc: FloatingPanelController) {}
-
-    func floatingPanelDidEndDraggingToRemove(_ vc: FloatingPanelController, withVelocity velocity: CGPoint) {}
-    func floatingPanelDidEndRemove(_ vc: FloatingPanelController) {}
-}
-
-public enum FloatingPanelPosition: Int, CaseIterable {
-    case full
-    case half
-    case tip
-}
-
-///
-/// A container view controller to display a floating panel to present contents in parallel as a user wants.
-///
-public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UIGestureRecognizerDelegate {
-
-    /// Constants indicating how safe area insets are added to the adjusted content inset.
-    public enum ContentInsetAdjustmentBehavior: Int {
-        case always
-        case never
-    }
-
-    /// The delegate of the floating panel controller object.
-    public weak var delegate: FloatingPanelControllerDelegate?
-
-    /// Returns the surface view managed by the controller object. It's the same as `self.view`.
-    public var surfaceView: FloatingPanelSurfaceView! {
-        return view as? FloatingPanelSurfaceView
-    }
-
-    /// Returns the backdrop view managed by the controller object.
-    public var backdropView: FloatingPanelBackdropView! {
-        return floatingPanel.backdropView
-    }
-
-    /// Returns the scroll view that the controller tracks.
-    public weak var scrollView: UIScrollView? {
-        return floatingPanel.scrollView
-    }
-
-    // The underlying gesture recognizer for pan gestures
-    public var panGestureRecognizer: UIPanGestureRecognizer {
-        return floatingPanel.panGesture
-    }
-
-    /// The current position of the floating panel controller's contents.
-    public var position: FloatingPanelPosition {
-        return floatingPanel.state
-    }
-
-    /// The layout object managed by the controller
-    public var layout: FloatingPanelLayout {
-        return floatingPanel.layoutAdapter.layout
-    }
-
-    /// The behavior object managed by the controller
-    public var behavior: FloatingPanelBehavior {
-        return floatingPanel.behavior
-    }
-
-    /// The content insets of the tracking scroll view derived from the safe area of the parent view
-    public var adjustedContentInsets: UIEdgeInsets {
-        return floatingPanel.layoutAdapter.adjustedContentInsets
-    }
-
-    /// The behavior for determining the adjusted content offsets.
-    ///
-    /// This property specifies how the content area of the tracking scroll view is modified using `adjustedContentInsets`. The default value of this property is FloatingPanelController.ContentInsetAdjustmentBehavior.always.
-    public var contentInsetAdjustmentBehavior: ContentInsetAdjustmentBehavior = .always
-
-    /// A Boolean value that determines whether the removal interaction is enabled.
-    public var isRemovalInteractionEnabled: Bool {
-        set { floatingPanel.isRemovalInteractionEnabled = newValue }
-        get { return floatingPanel.isRemovalInteractionEnabled }
-    }
-
-    /// The view controller responsible for the content portion of the floating panel.
-    public var contentViewController: UIViewController? {
-        set { set(contentViewController: newValue) }
-        get { return _contentViewController }
-    }
-    private var _contentViewController: UIViewController?
-
-    private var floatingPanel: FloatingPanel!
-    private var layoutInsetsObservations: [NSKeyValueObservation] = []
-
-    required init?(coder aDecoder: NSCoder) {
-        super.init(coder: aDecoder)
-
-        floatingPanel = FloatingPanel(self,
-                                      layout: fetchLayout(for: self.traitCollection),
-                                      behavior: fetchBehavior(for: self.traitCollection))
-    }
-
-    /// Initialize a newly created floating panel controller.
-    public init() {
-        super.init(nibName: nil, bundle: nil)
-
-        floatingPanel = FloatingPanel(self,
-                                      layout: fetchLayout(for: self.traitCollection),
-                                      behavior: fetchBehavior(for: self.traitCollection))
-    }
-
-    /// Creates the view that the controller manages.
-    override public func loadView() {
-        assert(self.storyboard == nil, "Storyboard isn't supported")
-
-        let view = FloatingPanelSurfaceView()
-        view.backgroundColor = .white
-
-        self.view = view as UIView
-    }
-
-    public override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
-        super.willTransition(to: newCollection, with: coordinator)
-
-        // Change layout for a new trait collection
-        updateLayout(for: newCollection)
-
-        floatingPanel.behavior = fetchBehavior(for: newCollection)
-    }
-
-    public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
-        super.traitCollectionDidChange(previousTraitCollection)
-        guard previousTraitCollection != traitCollection else { return }
-
-        if let parent = parent {
-            self.update(safeAreaInsets: parent.layoutInsets)
-        }
-    }
-
-    public override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-
-        // Need to update safeAreaInsets here to ensure that the `adjustedContentInsets` has a correct value.
-        // Because the parent VC does not call viewSafeAreaInsetsDidChange() expectedly and
-        // `view.safeAreaInsets` has a correct value of the bottom inset here.
-        if let parent = parent {
-            self.update(safeAreaInsets: parent.layoutInsets)
-        }
-    }
-
-    private func fetchLayout(for traitCollection: UITraitCollection) -> FloatingPanelLayout {
-        switch traitCollection.verticalSizeClass {
-        case .compact:
-            return self.delegate?.floatingPanel(self, layoutFor: traitCollection) ?? FloatingPanelDefaultLandscapeLayout()
-        default:
-            return self.delegate?.floatingPanel(self, layoutFor: traitCollection) ?? FloatingPanelDefaultLayout()
-        }
-    }
-
-    private func fetchBehavior(for traitCollection: UITraitCollection) -> FloatingPanelBehavior {
-        return self.delegate?.floatingPanel(self, behaviorFor: traitCollection) ?? FloatingPanelDefaultBehavior()
-    }
-
-    private func update(safeAreaInsets: UIEdgeInsets) {
-        floatingPanel.safeAreaInsets = safeAreaInsets
-        switch contentInsetAdjustmentBehavior {
-        case .always:
-            scrollView?.contentInset = adjustedContentInsets
-            scrollView?.scrollIndicatorInsets = adjustedContentInsets
-        default:
-            break
-        }
-    }
-
-    private func updateLayout(for traitCollection: UITraitCollection) {
-        floatingPanel.layoutAdapter.layout = fetchLayout(for: traitCollection)
-
-        guard let parent = parent else { return }
-
-        floatingPanel.layoutAdapter.prepareLayout(toParent: parent)
-        floatingPanel.layoutAdapter.activateLayout(of: floatingPanel.state)
-    }
-
-    // MARK: - Container view controller interface
-
-    /// Adds the view managed by the controller as a child of the specified view controller.
-    /// - Parameters:
-    ///     - parent: A parent view controller object that displays FloatingPanelController's view. A container view controller object isn't applicable.
-    ///     - belowView: Insert the surface view managed by the controller below the specified view. By default, the surface view will be added to the end of the parent list of subviews.
-    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
-    public func addPanel(toParent parent: UIViewController, belowView: UIView? = nil, animated: Bool = false) {
-        guard self.parent == nil else {
-            log.warning("Already added to a parent(\(parent))")
-            return
-        }
-        precondition((parent is UINavigationController) == false, "UINavigationController displays only one child view controller at a time.")
-        precondition((parent is UITabBarController) == false, "UITabBarController displays child view controllers with a radio-style selection interface")
-        precondition((parent is UISplitViewController) == false, "UISplitViewController manages two child view controllers in a master-detail interface")
-        precondition((parent is UITableViewController) == false, "UITableViewController should not be the parent because the view is a table view so that a floating panel doens't work well")
-        precondition((parent is UICollectionViewController) == false, "UICollectionViewController should not be the parent because the view is a collection view so that a floating panel doens't work well")
-
-        view.frame = parent.view.bounds
-        if let belowView = belowView {
-            parent.view.insertSubview(self.view, belowSubview: belowView)
-        } else {
-            parent.view.addSubview(self.view)
-        }
-
-        layoutInsetsObservations.removeAll()
-
-        // Must track safeAreaInsets/{top,bottom}LayoutGuide of the `parent.view`
-        // to update floatingPanel.safeAreaInsets`. There are 2 reasons.
-        // 1. The parent VC doesn't call viewSafeAreaInsetsDidChange() on the bottom
-        // inset's update expectedly.
-        // 2. The safe area top inset can be variable on the large title navigation bar.
-        // That's why it needs the observation to keep `adjustedContentInsets` correct.
-        if #available(iOS 11.0, *) {
-            let observaion = parent.observe(\.view.safeAreaInsets) { [weak self] (vc, chaneg) in
-                guard let self = self else { return }
-                self.update(safeAreaInsets: vc.layoutInsets)
-            }
-            layoutInsetsObservations.append(observaion)
-        } else {
-            // KVOs for topLayoutGuide & bottomLayoutGuide are not effective.
-            // Instead, safeAreaInsets will be updated in viewDidAppear()
-        }
-
-        parent.addChild(self)
-
-        // Must set a layout again here because `self.traitCollection` is applied correctly once it's added to a parent VC
-        floatingPanel.layoutAdapter.layout = fetchLayout(for: traitCollection)
-        floatingPanel.behavior = fetchBehavior(for: traitCollection)
-
-        floatingPanel.setUpViews(in: parent)
-
-        floatingPanel.present(animated: animated) { [weak self] in
-            guard let self = self else { return }
-            self.didMove(toParent: parent)
-        }
-    }
-
-    /// Removes the controller and the managed view from its parent view controller
-    /// - Parameters:
-    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
-    ///     - completion: The block to execute after the view controller is dismissed. This block has no return value and takes no parameters. You may specify nil for this parameter.
-    public func removePanelFromParent(animated: Bool, completion: (() -> Void)? = nil) {
-        guard self.parent != nil else {
-            completion?()
-            return
-        }
-
-        layoutInsetsObservations.removeAll()
-
-        floatingPanel.dismiss(animated: animated) { [weak self] in
-            guard let self = self else { return }
-
-            self.willMove(toParent: nil)
-            self.view.removeFromSuperview()
-	      	self.backdropView.removeFromSuperview()
-            self.removeFromParent()
-            completion?()
-        }
-    }
-
-    /// Moves the position to the specified position.
-    /// - Parameters:
-    ///     - to: Pass a FloatingPanelPosition value to move the surface view to the position.
-    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
-    ///     - completion: The block to execute after the view controller has finished moving. This block has no return value and takes no parameters. You may specify nil for this parameter.
-    public func move(to: FloatingPanelPosition, animated: Bool, completion: (() -> Void)? = nil) {
-        floatingPanel.move(to: to, animated: animated, completion: completion)
-    }
-
-    /// Sets the view controller responsible for the content portion of the floating panel..
-    public func set(contentViewController: UIViewController?) {
-        if let vc = _contentViewController {
-            vc.willMove(toParent: nil)
-            vc.view.removeFromSuperview()
-            vc.removeFromParent()
-        }
-
-        if let vc = contentViewController {
-            let surfaceView = self.view as! FloatingPanelSurfaceView
-            surfaceView.add(childView: vc.view)
-            addChild(vc)
-            vc.didMove(toParent: self)
-        }
-
-        _contentViewController = contentViewController
-    }
-
-    @available(*, unavailable, renamed: "set(contentViewController:)")
-    public override func show(_ vc: UIViewController, sender: Any?) {
-        if let target = self.parent?.targetViewController(forAction: #selector(UIViewController.show(_:sender:)), sender: sender) {
-            target.show(vc, sender: sender)
-        }
-    }
-
-    @available(*, unavailable, renamed: "set(contentViewController:)")
-    public override func showDetailViewController(_ vc: UIViewController, sender: Any?) {
-        if let target = self.parent?.targetViewController(forAction: #selector(UIViewController.showDetailViewController(_:sender:)), sender: sender) {
-            target.showDetailViewController(vc, sender: sender)
-        }
-    }
-
-    // MARK: - Scroll view tracking
-
-    /// Tracks the specified scroll view to correspond with the scroll.
-    ///
-    /// - Attention:
-    ///     The specified scroll view must be already assigned to the delegate property because the controller intermediates between the various delegate methods.
-    ///
-    public func track(scrollView: UIScrollView) {
-        floatingPanel.scrollView = scrollView
-        if scrollView.delegate !== floatingPanel {
-            floatingPanel.userScrollViewDelegate = scrollView.delegate
-            scrollView.delegate = floatingPanel
-        }
-        switch contentInsetAdjustmentBehavior {
-        case .always:
-            if #available(iOS 11.0, *) {
-                scrollView.contentInsetAdjustmentBehavior = .never
-            } else {
-                children.forEach { (vc) in
-                    vc.automaticallyAdjustsScrollViewInsets = false
-                }
-            }
-        default:
-            break
-        }
-    }
-
-    // MARK: - Utilities
-
-    /// Updates the layout object from the delegate and lays out the views managed
-    /// by the controller immediately.
-    ///
-    /// This method updates the `FloatingPanelLayout` object from the delegate and
-    /// then it calls `layoutIfNeeded()` of the parent's root view to force the view
-    /// to update the floating panel's layout immediately. It can be called in an
-    /// animation block.
-    public func updateLayout() {
-        updateLayout(for: view.traitCollection)
-    }
-
-    /// Returns the y-coordinate of the point at the origin of the surface view
-    public func originYOfSurface(for pos: FloatingPanelPosition) -> CGFloat {
-        switch pos {
-        case .full:
-            return floatingPanel.layoutAdapter.topY
-        case .half:
-            return floatingPanel.layoutAdapter.middleY
-        case .tip:
-            return floatingPanel.layoutAdapter.bottomY
-        }
-    }
-}

Framework/Sources/FloatingPanelLayout.swift

@@ -1,299 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/27.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-public protocol FloatingPanelLayout: class {
-    /// Returns the initial position of a floating panel.
-    var initialPosition: FloatingPanelPosition { get }
-
-    /// Returns a set of FloatingPanelPosition objects to tell the applicable positions of the floating panel controller. Default is all of them.
-    var supportedPositions: Set<FloatingPanelPosition> { get }
-
-    /// Return the interaction buffer to the top from the top position. Default is 6.0.
-    var topInteractionBuffer: CGFloat { get }
-
-    /// Return the interaction buffer to the bottom from the bottom position. Default is 6.0.
-    var bottomInteractionBuffer: CGFloat { get }
-
-    /// Returns a CGFloat value to determine a floating panel height for each position(full, half and tip).
-    /// A value for full position indicates a top inset from a safe area.
-    /// On the other hand, values for half and tip positions indicate bottom insets from a safe area.
-    /// If a position doesn't contain the supported positions, return nil.
-    func insetFor(position: FloatingPanelPosition) -> CGFloat?
-
-    /// Returns X-axis and width layout constraints of the surface view of a floating panel.
-    /// You must not include any Y-axis and height layout constraints of the surface view
-    /// because their constraints will be configured by the floating panel controller.
-    /// By default, the width of a surface view fits a safe area.
-    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint]
-
-    /// Returns a CGFloat value to determine the backdrop view's alpha for a position.
-    ///
-    /// Default is 0.3 at full position, otherwise 0.0.
-    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat
-}
-
-public extension FloatingPanelLayout {
-    var topInteractionBuffer: CGFloat { return 6.0 }
-    var bottomInteractionBuffer: CGFloat { return 6.0 }
-
-    var supportedPositions: Set<FloatingPanelPosition> {
-        return Set(FloatingPanelPosition.allCases)
-    }
-    
-    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
-        return [
-            surfaceView.leftAnchor.constraint(equalTo: view.sideLayoutGuide.leftAnchor, constant: 0.0),
-            surfaceView.rightAnchor.constraint(equalTo: view.sideLayoutGuide.rightAnchor, constant: 0.0),
-        ]
-    }
-
-    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat {
-        return position == .full ? 0.3 : 0.0
-    }
-}
-
-public class FloatingPanelDefaultLayout: FloatingPanelLayout {
-    public var initialPosition: FloatingPanelPosition {
-        return .half
-    }
-
-    public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 18.0
-        case .half: return 262.0
-        case .tip: return 69.0
-        }
-    }
-}
-
-public class FloatingPanelDefaultLandscapeLayout: FloatingPanelLayout {
-    public var initialPosition: FloatingPanelPosition {
-        return .tip
-    }
-    public var supportedPositions: Set<FloatingPanelPosition> {
-        return [.full, .tip]
-    }
-
-    public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 16.0
-        case .tip: return 69.0
-        default: return nil
-        }
-    }
-}
-
-
-class FloatingPanelLayoutAdapter {
-    private weak var parent: UIViewController!
-    private weak var surfaceView: FloatingPanelSurfaceView!
-    private weak var backdropView: FloatingPanelBackdropView!
-
-    var layout: FloatingPanelLayout {
-        didSet {
-            checkLayoutConsistance()
-        }
-    }
-
-    var safeAreaInsets: UIEdgeInsets = .zero {
-        didSet {
-            updateHeight()
-            checkLayoutConsistance()
-        }
-    }
-
-    private var parentHeight: CGFloat = 0.0
-    private var heightBuffer: CGFloat = 88.0 // For bounce
-    private var fixedConstraints: [NSLayoutConstraint] = []
-    private var fullConstraints: [NSLayoutConstraint] = []
-    private var halfConstraints: [NSLayoutConstraint] = []
-    private var tipConstraints: [NSLayoutConstraint] = []
-    private var offConstraints: [NSLayoutConstraint] = []
-    private var heightConstraints: [NSLayoutConstraint] = []
-
-    private var fullInset: CGFloat {
-        return layout.insetFor(position: .full) ?? 0.0
-    }
-    private var halfInset: CGFloat {
-        return layout.insetFor(position: .half) ?? 0.0
-    }
-    private var tipInset: CGFloat {
-        return layout.insetFor(position: .tip) ?? 0.0
-    }
-
-    var topY: CGFloat {
-        if layout.supportedPositions.contains(.full) {
-            return (safeAreaInsets.top + fullInset)
-        } else {
-            return middleY
-        }
-    }
-
-    var middleY: CGFloat {
-        return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + halfInset)
-    }
-
-    var bottomY: CGFloat {
-        if layout.supportedPositions.contains(.tip) {
-            return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + tipInset)
-        } else {
-            return middleY
-        }
-    }
-
-    var safeAreaBottomY: CGFloat {
-        return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom)
-    }
-
-    var adjustedContentInsets: UIEdgeInsets {
-        return UIEdgeInsets(top: 0.0,
-                            left: 0.0,
-                            bottom: safeAreaInsets.bottom,
-                            right: 0.0)
-    }
-
-    func positionY(for pos: FloatingPanelPosition) -> CGFloat {
-        switch pos {
-        case .full:
-            return topY
-        case .half:
-            return middleY
-        case .tip:
-            return bottomY
-        }
-    }
-
-    init(surfaceView: FloatingPanelSurfaceView, backdropView: FloatingPanelBackdropView, layout: FloatingPanelLayout) {
-        self.layout = layout
-        self.surfaceView = surfaceView
-        self.backdropView = backdropView
-    }
-
-    func prepareLayout(toParent parent: UIViewController) {
-        self.parent = parent
-
-        surfaceView.translatesAutoresizingMaskIntoConstraints = false
-        backdropView.translatesAutoresizingMaskIntoConstraints = false
-
-        NSLayoutConstraint.deactivate(fixedConstraints + fullConstraints + halfConstraints + tipConstraints + offConstraints)
-
-        // Fixed constraints of surface and backdrop views
-        let surfaceConstraints = layout.prepareLayout(surfaceView: surfaceView, in: parent.view!)
-        let backdropConstraints = [
-            backdropView.topAnchor.constraint(equalTo: parent.view.topAnchor,
-                                              constant: 0.0),
-            backdropView.leftAnchor.constraint(equalTo: parent.view.leftAnchor,
-                                               constant: 0.0),
-            backdropView.rightAnchor.constraint(equalTo: parent.view.rightAnchor,
-                                                constant: 0.0),
-            backdropView.bottomAnchor.constraint(equalTo: parent.view.bottomAnchor,
-                                                 constant: 0.0),
-            ]
-        fixedConstraints = surfaceConstraints + backdropConstraints
-
-        // Flexible surface constarints for full, half, tip and off
-        fullConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: parent.layoutGuide.topAnchor,
-                                             constant: fullInset),
-        ]
-        halfConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: parent.layoutGuide.bottomAnchor,
-                                             constant: -halfInset),
-        ]
-        tipConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: parent.layoutGuide.bottomAnchor,
-                                             constant: -tipInset),
-        ]
-        offConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: parent.view.bottomAnchor, constant: 0.0),
-        ]
-    }
-
-    // The method is separated from prepareLayout(to:) for the rotation support
-    // It must be called in FloatingPanelController.traitCollectionDidChange(_:)
-    func updateHeight() {
-        defer {
-            UIView.performWithoutAnimation {
-                surfaceView.superview!.layoutIfNeeded()
-            }
-        }
-
-        NSLayoutConstraint.deactivate(heightConstraints)
-        // Must use the parent height, not the screen height because safe area insets
-        // of the parent are relative values. For example, a view controller in
-        // Navigation controller's safe area insets and frame can be changed whether
-        // the navigation bar is translucent or not.
-        let height = self.parent.view.bounds.height - (safeAreaInsets.top + fullInset)
-        heightConstraints = [
-            surfaceView.heightAnchor.constraint(equalToConstant: height)
-        ]
-        NSLayoutConstraint.activate(heightConstraints)
-        surfaceView.set(bottomOverflow: heightBuffer)
-    }
-
-    func activateLayout(of state: FloatingPanelPosition?) {
-        defer {
-            surfaceView.superview!.layoutIfNeeded()
-        }
-        setBackdropAlpha(of: state)
-
-        NSLayoutConstraint.activate(fixedConstraints)
-
-        guard var state = state else {
-            NSLayoutConstraint.deactivate(fullConstraints + halfConstraints + tipConstraints)
-            NSLayoutConstraint.activate(offConstraints)
-            return
-        }
-
-        if layout.supportedPositions.contains(state) == false {
-            state = layout.initialPosition
-        }
-
-        NSLayoutConstraint.deactivate(fullConstraints + halfConstraints + tipConstraints + offConstraints)
-        switch state {
-        case .full:
-            NSLayoutConstraint.deactivate(halfConstraints + tipConstraints + offConstraints)
-            NSLayoutConstraint.activate(fullConstraints)
-        case .half:
-            NSLayoutConstraint.deactivate(fullConstraints + tipConstraints + offConstraints)
-            NSLayoutConstraint.activate(halfConstraints)
-        case .tip:
-            NSLayoutConstraint.deactivate(fullConstraints + halfConstraints + offConstraints)
-            NSLayoutConstraint.activate(tipConstraints)
-        }
-    }
-
-    func setBackdropAlpha(of target: FloatingPanelPosition?) {
-        if let target = target {
-            self.backdropView.alpha = layout.backdropAlphaFor(position: target)
-        } else {
-            self.backdropView.alpha = 0.0
-        }
-    }
-
-    func checkLayoutConsistance() {
-        // Verify layout configurations
-        let supportedPositions = layout.supportedPositions
-
-        assert(supportedPositions.count > 0)
-        assert(supportedPositions.contains(layout.initialPosition),
-               "Does not include an initial potision(\(layout.initialPosition)) in supportedPositions(\(supportedPositions))")
-
-        supportedPositions.forEach { pos in
-            assert(layout.insetFor(position: pos) != nil,
-                   "Undefined an inset for a pos(\(pos))")
-        }
-
-        if halfInset > 0 {
-            assert(halfInset > tipInset, "Invalid half and tip insets")
-        }
-        if fullInset > 0 {
-            assert(middleY > topY, "Invalid insets")
-            assert(bottomY > topY, "Invalid insets")
-        }
-    }
-}

Framework/Sources/FloatingPanelSurfaceView.swift

@@ -1,175 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/26.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-class FloatingPanelSurfaceContentView: UIView {}
-
-/// A view that presents a surface interface in a floating panel.
-public class FloatingPanelSurfaceView: UIView {
-
-    /// A GrabberHandleView object displayed at the top of the surface view
-    public var grabberHandle: GrabberHandleView!
-
-    /// The height of the grabber bar area
-    public static var topGrabberBarHeight: CGFloat {
-        return Default.grabberTopPadding * 2 + GrabberHandleView.Default.height // 17.0
-    }
-
-    /// A UIView object that can have the surface view added to it.
-    public var contentView: UIView!
-
-    private var color: UIColor? = .white { didSet { setNeedsLayout() } }
-    private var bottomOverflow: CGFloat = 0.0 // Must not call setNeedsLayout()
-
-    public override var backgroundColor: UIColor? {
-        get { return color }
-        set { color = newValue }
-    }
-
-    /// The radius to use when drawing top rounded corners.
-    ///
-    /// `self.contentView` is masked with the top rounded corners automatically on iOS 11 and later.
-    /// On iOS 10, they are not automatically masked because of a UIVisualEffectView issue. See https://forums.developer.apple.com/thread/50854
-    public var cornerRadius: CGFloat = 0.0 { didSet { setNeedsLayout() } }
-
-    /// A Boolean indicating whether the surface shadow is displayed.
-    public var shadowHidden: Bool = false  { didSet { setNeedsLayout() } }
-
-    /// The color of the surface shadow.
-    public var shadowColor: UIColor = .black  { didSet { setNeedsLayout() } }
-
-    /// The offset (in points) of the surface shadow.
-    public var shadowOffset: CGSize = CGSize(width: 0.0, height: 1.0)  { didSet { setNeedsLayout() } }
-
-    /// The opacity of the surface shadow.
-    public var shadowOpacity: Float = 0.2 { didSet { setNeedsLayout() } }
-
-    /// The blur radius (in points) used to render the surface shadow.
-    public var shadowRadius: CGFloat = 3  { didSet { setNeedsLayout() } }
-
-    /// The width of the surface border.
-    public var borderColor: UIColor?  { didSet { setNeedsLayout() } }
-
-    /// The color of the surface border.
-    public var borderWidth: CGFloat = 0.0  { didSet { setNeedsLayout() } }
-
-    private var backgroundLayer: CAShapeLayer!  { didSet { setNeedsLayout() } }
-
-    private struct Default {
-        public static let grabberTopPadding: CGFloat = 6.0
-    }
-
-    override init(frame: CGRect) {
-        super.init(frame: frame)
-        render()
-    }
-
-    required init?(coder aDecoder: NSCoder) {
-        super.init(coder: aDecoder)
-        render()
-    }
-
-    private func render() {
-        super.backgroundColor = .clear
-        self.clipsToBounds = false
-
-        let backgroundLayer = CAShapeLayer()
-        layer.insertSublayer(backgroundLayer, at: 0)
-        self.backgroundLayer = backgroundLayer
-
-        let contentView = FloatingPanelSurfaceContentView()
-        addSubview(contentView)
-        self.contentView = contentView as UIView
-        contentView.backgroundColor = color
-        contentView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            contentView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0),
-            contentView.leftAnchor.constraint(equalTo: leftAnchor, constant: 0.0),
-            contentView.rightAnchor.constraint(equalTo: rightAnchor, constant: 0.0),
-            contentView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0),
-            ])
-
-        let grabberHandle = GrabberHandleView()
-        addSubview(grabberHandle)
-        self.grabberHandle = grabberHandle
-
-        grabberHandle.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            grabberHandle.topAnchor.constraint(equalTo: topAnchor, constant: Default.grabberTopPadding),
-            grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandle.frame.width),
-            grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandle.frame.height),
-            grabberHandle.centerXAnchor.constraint(equalTo: centerXAnchor),
-            ])
-    }
-
-    public override func layoutSubviews() {
-        super.layoutSubviews()
-
-        updateLayers()
-        updateContentViewMask()
-
-        contentView.layer.borderColor = borderColor?.cgColor
-        contentView.layer.borderWidth = borderWidth
-        contentView.backgroundColor = color
-    }
-
-    private func updateLayers() {
-        log.debug("SurfaceView bounds", bounds)
-        
-        var rect = bounds
-        rect.size.height += bottomOverflow // Expand the height for overflow buffer
-        let path = UIBezierPath(roundedRect: rect,
-                                byRoundingCorners: [.topLeft, .topRight],
-                                cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
-        backgroundLayer.path = path.cgPath
-        backgroundLayer.fillColor = color?.cgColor
-		
-        if shadowHidden == false {
-            layer.shadowColor = shadowColor.cgColor
-            layer.shadowOffset = shadowOffset
-            layer.shadowOpacity = shadowOpacity
-            layer.shadowRadius = shadowRadius
-        }
-    }
-
-    private func updateContentViewMask() {
-        if #available(iOS 11, *) {
-            // Don't use `contentView.clipToBounds` because it prevents content view from expanding the height of a subview of it
-            // for the bottom overflow like Auto Layout settings of UIVisualEffectView in Main.storyborad of Example/Maps.
-            // Because the bottom of contentView must be fit to the bottom of a screen to work the `safeLayoutGuide` of a content VC.
-            let maskLayer = CAShapeLayer()
-            var rect = bounds
-            rect.size.height += bottomOverflow
-            let path = UIBezierPath(roundedRect: rect,
-                                    byRoundingCorners: [.topLeft, .topRight],
-                                    cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
-            maskLayer.path = path.cgPath
-            contentView.layer.mask = maskLayer
-        } else {
-            // Don't use `contentView.layer.mask` because of a UIVisualEffectView issue in iOS 10, https://forums.developer.apple.com/thread/50854
-            // Instead, a user can mask the content view manually in an application.
-        }
-    }
-
-    func set(bottomOverflow: CGFloat) {
-        self.bottomOverflow = bottomOverflow
-        updateLayers()
-        updateContentViewMask()
-    }
-
-
-    func add(childView: UIView) {
-        contentView.addSubview(childView)
-        childView.frame = contentView.bounds
-        childView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            childView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 0.0),
-            childView.leftAnchor.constraint(equalTo: contentView.leftAnchor, constant: 0.0),
-            childView.rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: 0.0),
-            childView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: 0.0),
-            ])
-    }
-}

Framework/Sources/GrabberHandleView.swift

@@ -1,37 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/19.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-public class GrabberHandleView: UIView {
-    public struct Default {
-        public static let width: CGFloat = 36.0
-        public static let height: CGFloat = 5.0
-        public static let barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0)
-    }
-
-    required init?(coder aDecoder: NSCoder) {
-        super.init(coder: aDecoder)
-        render()
-    }
-
-    init() {
-        let size = CGSize(width: Default.width,
-                          height: Default.height)
-        super.init(frame: CGRect(origin: .zero, size: size))
-        self.backgroundColor = Default.barColor
-        render()
-    }
-
-    private func render() {
-        self.layer.masksToBounds = true
-        self.layer.cornerRadius = frame.size.height * 0.5
-    }
-
-    public override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
-        let view = super.hitTest(point, with: event)
-        return view == self ? nil : view
-    }
-}

Framework/Sources/Logger.swift

@@ -1,106 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/10/09.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import Foundation
-import os.log
-
-var log = {
-    return Logger()
-}()
-
-struct Logger {
-    private let osLog: OSLog
-    private let s = DispatchSemaphore(value: 1)
-
-    enum Level: Int, Comparable {
-        case debug = 0
-        case info = 1
-        case warning = 2
-        case error = 3
-        case fault = 4
-
-        var name: String {
-            switch self {
-            case .debug: return "DEBUG"
-            case .info: return "INFO"
-            case .warning: return "WARNING"
-            case .error: return "ERROR"
-            case .fault: return "FAULT"
-            }
-        }
-        var shortName: String {
-            switch self {
-            case .debug:
-                return "D/"
-            case .info:
-                return "I/"
-            case .warning:
-                return "W/"
-            case .error:
-                return "E/"
-            case .fault:
-                return "F/"
-            }
-        }
-        @available(iOS 10.0, *)
-        var osLogType: OSLogType {
-            switch self {
-            case .debug: return .debug
-            case .info: return .info
-            case .warning: return .info
-            case .error: return .error
-            case .fault: return .fault
-            }
-        }
-
-        public static func < (lhs: Logger.Level, rhs: Logger.Level) -> Bool {
-            return lhs.rawValue < rhs.rawValue
-        }
-    }
-
-    init() {
-        osLog = OSLog(subsystem: "com.scenee.FloatingPanel", category: "FloatingPanel")
-    }
-
-    private func log(_ level: Level, _ message: Any, _ arguments: [Any], function: String, line: UInt) {
-        #if __FP_LOG
-        _ = s.wait(timeout: .now() + 0.033)
-        defer { s.signal() }
-
-        let extraMessage: String = arguments.map({ String(describing: $0) }).joined(separator: " ")
-        let log = "\(level.shortName) \(message) \(extraMessage) (\(function):\(line))"
-
-        os_log("%@", log: osLog, type: level.osLogType, log)
-        #endif
-    }
-
-    private func getPrettyFunction(_ function: String, _ file: String) -> String {
-        if let filename = file.split(separator: "/").last {
-            return filename + ":" + function
-        } else {
-            return file + ":" + function
-        }
-    }
-
-    func debug(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
-        self.log(.debug, log, arguments, function: getPrettyFunction(function, file), line: line)
-    }
-
-    func info(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
-        self.log(.info, log, arguments, function: getPrettyFunction(function, file), line: line)
-    }
-
-    func warning(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
-        self.log(.warning, log, arguments, function: getPrettyFunction(function, file), line: line)
-    }
-
-    func error(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
-        self.log(.error, log, arguments, function: getPrettyFunction(function, file), line: line)
-    }
-
-    func fault(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
-        self.log(.fault, log, arguments, function: getPrettyFunction(function, file), line: line)
-    }
-}

Framework/Sources/UIExtensions.swift

@@ -1,91 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import UIKit
-
-protocol LayoutGuideProvider {
-    var topAnchor: NSLayoutYAxisAnchor { get }
-    var bottomAnchor: NSLayoutYAxisAnchor { get }
-}
-extension UILayoutGuide: LayoutGuideProvider {}
-
-class CustomLayoutGuide: LayoutGuideProvider {
-    let topAnchor: NSLayoutYAxisAnchor
-    let bottomAnchor: NSLayoutYAxisAnchor
-    init(topAnchor: NSLayoutYAxisAnchor, bottomAnchor: NSLayoutYAxisAnchor) {
-        self.topAnchor = topAnchor
-        self.bottomAnchor = bottomAnchor
-    }
-}
-
-extension UIViewController {
-    var layoutInsets: UIEdgeInsets {
-        if #available(iOS 11.0, *) {
-            return view.safeAreaInsets
-        } else {
-            return UIEdgeInsets(top: topLayoutGuide.length,
-                                left: 0.0,
-                                bottom: bottomLayoutGuide.length,
-                                right: 0.0)
-        }
-    }
-
-    var layoutGuide: LayoutGuideProvider {
-        if #available(iOS 11.0, *) {
-            return view!.safeAreaLayoutGuide
-        } else {
-            return CustomLayoutGuide(topAnchor: topLayoutGuide.bottomAnchor,
-                                     bottomAnchor: bottomLayoutGuide.topAnchor)
-        }
-    }
-}
-
-protocol SideLayoutGuideProvider {
-    var leftAnchor: NSLayoutXAxisAnchor { get }
-    var rightAnchor: NSLayoutXAxisAnchor { get }
-}
-
-extension UIView: SideLayoutGuideProvider {}
-extension UILayoutGuide: SideLayoutGuideProvider {}
-
-// The reason why UIView has no extensions of safe area insets and top/bottom guides
-// is for iOS10 compat.
-extension UIView {
-    var sideLayoutGuide: SideLayoutGuideProvider {
-        if #available(iOS 11.0, *) {
-            return safeAreaLayoutGuide
-        } else {
-            return self
-        }
-    }
-}
-
-extension UIGestureRecognizer.State: CustomDebugStringConvertible {
-    public var debugDescription: String {
-        switch self {
-        case .began: return "Began"
-        case .changed: return "Changed"
-        case .failed: return "Failed"
-        case .cancelled: return "Cancelled"
-        case .ended: return "Endeded"
-        case .possible: return "Possible"
-        }
-    }
-}
-
-extension UIScrollView {
-    var contentOffsetZero: CGPoint {
-        return CGPoint(x: 0.0, y: 0.0 - contentInset.top)
-    }
-}
-
-extension UISpringTimingParameters {
-    public convenience init(dampingRatio: CGFloat, frequencyResponse: CGFloat, initialVelocity: CGVector = .zero) {
-        let mass = 1 as CGFloat
-        let stiffness = pow(2 * .pi / frequencyResponse, 2) * mass
-        let damp = 4 * .pi * dampingRatio * mass / frequencyResponse
-        self.init(mass: mass, stiffness: stiffness, damping: damp, initialVelocity: initialVelocity)
-    }
-}

Framework/Tests/ViewTests.swift

@@ -1,14 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import XCTest
-@testable import FloatingPanelController
-
-class ViewTests: XCTestCase {
-
-    override func setUp() {}
-
-    override func tearDown() {}
-}

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 Shin Yamamoto
+Copyright (c) 2018-Present Shin Yamamoto
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -18,4 +18,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.

Package.swift

@@ -0,0 +1,27 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "FloatingPanel",
+    platforms: [
+        .iOS(.v10)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "FloatingPanel",
+            targets: ["FloatingPanel"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(name: "FloatingPanel", path: "Sources"),
+    ],
+    swiftLanguageVersions: [.version("5")]
+)

README.md

@@ -2,10 +2,9 @@
 [![Version](https://img.shields.io/cocoapods/v/FloatingPanel.svg)](https://cocoapods.org/pods/FloatingPanel)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 [![Platform](https://img.shields.io/cocoapods/p/FloatingPanel.svg)](https://cocoapods.org/pods/FloatingPanel)
-[![Swift 4.2](https://img.shields.io/badge/Swift-4.2-orange.svg?style=flat)](https://swift.org/)
-
-#  FloatingPanel
+[![Swift 5](https://img.shields.io/badge/Swift-5-orange.svg?style=flat)](https://swift.org/)
 
+# FloatingPanel
 
 FloatingPanel is a simple and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app.
 The new interface displays the related contents and utilities in parallel as a user wants.
@@ -20,22 +19,48 @@ The new interface displays the related contents and utilities in parallel as a u
 - [Features](#features)
 - [Requirements](#requirements)
 - [Installation](#installation)
-  - [CocoaPods](#cocoapods)
-  - [Carthage](#carthage)
+    - [CocoaPods](#cocoapods)
+    - [Carthage](#carthage)
+    - [Swift Package Manager](#swift-package-manager)
 - [Getting Started](#getting-started)
+    - [Add a floating panel as a child view controller](#add-a-floating-panel-as-a-child-view-controller)
+    - [Present a floating panel as a modality](#present-a-floating-panel-as-a-modality)
+- [View hierarchy](#view-hierarchy)
 - [Usage](#usage)
-  - [Customize the layout of a floating panel with  `FloatingPanelLayout` protocol](#customize-the-layout-of-a-floating-panel-with--floatingpanellayout-protocol)
-    - [Change the initial position and height](#change-the-initial-position-and-height)
-    - [Support your landscape layout](#support-your-landscape-layout)
-  - [Customize the behavior with `FloatingPanelBehavior` protocol](#customize-the-behavior-with-floatingpanelbehavior-protocol)
-    - [Modify your floating panel's interaction](#modify-your-floating-panels-interaction)
-  - [Create an additional floating panel for a detail](#create-an-additional-floating-panel-for-a-detail)
-  - [Move a position with an animation](#move-a-position-with-an-animation)
-  - [Make your contents correspond with a floating panel behavior](#make-your-contents-correspond-with-a-floating-panel-behavior)
+    - [Show/Hide a floating panel in a view with your view hierarchy](#showhide-a-floating-panel-in-a-view-with-your-view-hierarchy)
+    - [Scale the content view when the surface position changes](#scale-the-content-view-when-the-surface-position-changes)
+    - [Customize the layout with `FloatingPanelLayout` protocol](#customize-the-layout-with-floatingpanellayout-protocol)
+        - [Change the initial layout](#change-the-initial-layout)
+    - [Update your panel layout](#update-your-panel-layout)
+        - [Support your landscape layout](#support-your-landscape-layout)
+        - [Use the intrinsic size of a content in your panel layout](#use-the-intrinsic-size-of-a-content-in-your-panel-layout)
+        - [Specify an anchor for each state by an inset of the `FloatingPanelController.view` frame](#specify-an-anchor-for-each-state-by-an-inset-of-the-floatingpanelcontrollerview-frame)
+        - [Change the backdrop alpha](#change-the-backdrop-alpha)
+        - [Using custome panel states](#using-custome-panel-states)
+    - [Customize the behavior with `FloatingPanelBehavior` protocol](#customize-the-behavior-with-floatingpanelbehavior-protocol)
+        - [Modify your floating panel's interaction](#modify-your-floating-panels-interaction)
+        - [Activate the rubber-band effect on panel edges](#activate-the-rubber-band-effect-on-panel-edges)
+        - [Manage the projection of a pan gesture momentum](#manage-the-projection-of-a-pan-gesture-momentum)
+    - [Specify the panel move's boundary](#specify-the-panel-moves-boundary)
+    - [Customize the surface design](#customize-the-surface-design)
+        - [Modify your surface appearance](#modify-your-surface-appearance)
+        - [Use a custom grabber handle](#use-a-custom-grabber-handle)
+        - [Customize layout of the grabber handle](#customize-layout-of-the-grabber-handle)
+        - [Customize content padding from surface edges](#customize-content-padding-from-surface-edges)
+        - [Customize margins of the surface edges](#customize-margins-of-the-surface-edges)
+    - [Customize gestures](#customize-gestures)
+        - [Suppress the panel interaction](#suppress-the-panel-interaction)
+        - [Add tap gestures to the surface view](#add-tap-gestures-to-the-surface-view)
+        - [Interrupt the delegate methods of `FloatingPanelController.panGestureRecognizer`](#interrupt-the-delegate-methods-of-floatingpanelcontrollerpangesturerecognizer)
+    - [Create an additional floating panel for a detail](#create-an-additional-floating-panel-for-a-detail)
+    - [Move a position with an animation](#move-a-position-with-an-animation)
+    - [Work your contents together with a floating panel behavior](#work-your-contents-together-with-a-floating-panel-behavior)
+    - [Enabling the tap-to-dismiss action of the backdrop view](#enabling-the-tap-to-dismiss-action-of-the-backdrop-view)
 - [Notes](#notes)
-  - ['Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller](#show-or-show-detail-segues-from-floatingpanelcontrollers-content-view-controller)
-  - [FloatingPanelSurfaceView's issue on iOS 10](#floatingpanelsurfaceviews-issue-on-ios-10)
-- [Author](#author)
+    - ['Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller](#show-or-show-detail-segues-from-floatingpanelcontrollers-content-view-controller)
+    - [UISearchController issue](#uisearchcontroller-issue)
+    - [FloatingPanelSurfaceView's issue on iOS 10](#floatingpanelsurfaceviews-issue-on-ios-10)
+- [Maintainer](#maintainer)
 - [License](#license)
 
 <!-- /TOC -->
@@ -43,22 +68,32 @@ The new interface displays the related contents and utilities in parallel as a u
 ## Features
 
 - [x] Simple container view controller
-- [x] Fluid animation and gesture handling
+- [x] Fluid behavior using numeric springing
 - [x] Scroll view tracking
-- [x] Common UI elements: Grabber handle, Backdrop and Surface rounding corners
-- [x] 1~3 anchor positions(full, half, tip)
-- [x] Layout customization for all trait environments(i.e. Landscape orientation support)
-- [x] Behavior customization
+- [x] Removal interaction
+- [x] Multi panel support
+- [x] Modal presentation
+- [x] 4 positioning support(top, left, bottom, right)
+- [x] 1 or more magnetic anchors(full, half, tip and more)
+- [x] Layout support for all trait environments(i.e. Landscape orientation)
+- [x] Common UI elements: surface, backdrop and grabber handle
 - [x] Free from common issues of Auto Layout and gesture handling
+- [x] Compatible with Objective-C
 
 Examples are here.
 
 - [Examples/Maps](https://github.com/SCENEE/FloatingPanel/tree/master/Examples/Maps) like Apple Maps.app.
 - [Examples/Stocks](https://github.com/SCENEE/FloatingPanel/tree/master/Examples/Stocks) like Apple Stocks.app.
+- [Examples/Samples](https://github.com/SCENEE/FloatingPanel/tree/master/Examples/Samples)
+- [Examples/SamplesObjC](https://github.com/SCENEE/FloatingPanel/tree/master/Examples/SamplesObjC)
 
 ## Requirements
 
-FloatingPanel is written in Swift 4.2. Compatible with iOS 10.0+
+FloatingPanel is written in Swift 5.0+. Compatible with iOS 11.0+.
+
+The deployment is still iOS 10, but it is recommended to use this library on iOS 11+.
+
+:pencil2: You would like to use Swift 4.0. Please use FloatingPanel v1. 
 
 ## Installation
 
@@ -71,6 +106,8 @@ it, simply add the following line to your Podfile:
 pod 'FloatingPanel'
 ```
 
+:pencil2: FloatingPanel v1.7.0 or later requires CocoaPods v1.7.0+ for `swift_versions` support.
+
 ### Carthage
 
 For [Carthage](https://github.com/Carthage/Carthage), add the following to your `Cartfile`:
@@ -79,9 +116,14 @@ For [Carthage](https://github.com/Carthage/Carthage), add the following to your
 github "scenee/FloatingPanel"
 ```
 
+### Swift Package Manager
+
+Follow [this doc](https://developer.apple.com/documentation/swift_packages/adding_package_dependencies_to_your_app).
 
 ## Getting Started
 
+### Add a floating panel as a child view controller
+
 ```swift
 import UIKit
 import FloatingPanel
@@ -107,43 +149,158 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
         // Add and show the views managed by the `FloatingPanelController` object to self.view.
         fpc.addPanel(toParent: self)
     }
-
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        // Remove the views managed by the `FloatingPanelController` object from self.view.
-        fpc.removePanelFromParent()
-    }
-    ...
 }
 ```
 
+### Present a floating panel as a modality
+
+```swift
+let fpc = FloatingPanelController()
+let contentVC = ...
+fpc.set(contentViewController: contentVC)
+
+fpc.isRemovalInteractionEnabled = true // Optional: Let it removable by a swipe-down
+
+self.present(fpc, animated: true, completion: nil)
+```
+
+You can show a floating panel over UINavigationController from the container view controllers as a modality of `.overCurrentContext` style.
+
+:pencil2: FloatingPanelController has the custom presentation controller. If you would like to customize the presentation/dismissal, please see [Transitioning](https://github.com/SCENEE/FloatingPanel/blob/master/Sources/Transitioning.swift).
+
+## View hierarchy
+
+`FloatingPanelController` manages the views as the following view hierarchy.
+
+```
+FloatingPanelController.view (FloatingPanelPassThroughView)
+ ├─ .backdropView (FloatingPanelBackdropView)
+ └─ .surfaceView (FloatingPanelSurfaceView)
+    ├─ .containerView (UIView)
+    │  └─ .contentView (FloatingPanelController.contentViewController.view)
+    └─ .grabber (FloatingPanelGrabberView)
+```
+
 ## Usage
 
-### Customize the layout of a floating panel with  `FloatingPanelLayout` protocol
+### Show/Hide a floating panel in a view with your view hierarchy
 
-#### Change the initial position and height
+If you need more control over showing and hiding the floating panel, you can forgo the `addPanel` and `removePanelFromParent` methods. These methods are a convenience wrapper for **FloatingPanel**'s `show` and `hide` methods along with some required setup.
+
+There are two ways to work with the `FloatingPanelController`:
+1. Add it to the hierarchy once and then call `show` and `hide` methods to make it appear/disappear.
+2. Add it to the hierarchy when needed and remove afterwards.
+
+The following example shows how to add the controller to your `UIViewController` and how to remove it. Make sure that you never add the same `FloatingPanelController` to the hierarchy before removing it.
+
+**NOTE**: `self.` prefix is not required, nor recommended. It's used here to make it clearer where do the functions used come from. `self` is an instance of a custom UIViewController in your code.
+
+```swift
+// Add the floating panel view to the controller's view on top of other views.
+self.view.addSubview(fpc.view)
+
+// REQUIRED. It makes the floating panel view have the same size as the controller's view.
+fpc.view.frame = self.view.bounds
+
+// In addition, Auto Layout constraints are highly recommended.
+// Constraint the fpc.view to all four edges of your controller's view.
+// It makes the layout more robust on trait collection change.
+fpc.view.translatesAutoresizingMaskIntoConstraints = false
+NSLayoutConstraint.activate([
+  fpc.view.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0.0),
+  fpc.view.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 0.0),
+  fpc.view.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: 0.0),
+  fpc.view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0.0),
+])
+
+// Add the floating panel controller to the controller hierarchy.
+self.addChild(fpc)
+
+// Show the floating panel at the initial position defined in your `FloatingPanelLayout` object.
+fpc.show(animated: true) {
+    // Inform the floating panel controller that the transition to the controller hierarchy has completed.
+    fpc.didMove(toParent: self)
+}
+```
+
+After you add the `FloatingPanelController` as seen above, you can call `fpc.show(animated: true) { }` to show the panel and `fpc.hide(animated: true) { }` to hide it.
+
+To remove the `FloatingPanelController` from the hierarchy, follow the example below.
+
+```swift
+// Inform the panel controller that it will be removed from the hierarchy.
+fpc.willMove(toParent: nil)
+    
+// Hide the floating panel.
+fpc.hide(animated: true) {
+    // Remove the floating panel view from your controller's view.
+    fpc.view.removeFromSuperview()
+    // Remove the floating panel controller from the controller hierarchy.
+    fpc.removeFromParent()
+}
+```
+
+### Scale the content view when the surface position changes
+
+Specify the `contentMode` to `.fitToBounds` if the surface height fits the bounds of `FloatingPanelController.view` when the surface position changes
+
+```swift
+fpc.contentMode = .fitToBounds
+```
+
+Otherwise, `FloatingPanelController` fixes the content by the height of the top most position.
+
+:pencil2: In `.fitToBounds` mode, the surface height changes as following a user interaction so that you have a responsibility to configure Auto Layout constrains not to break the layout of a content view by the elastic surface height.
+
+### Customize the layout with `FloatingPanelLayout` protocol
+
+#### Change the initial layout
+
+```swift
+class ViewController: UIViewController, FloatingPanelControllerDelegate {
+    ... {
+        fpc = FloatingPanelController(delegate: self)
+        fpc.layout = MyFloatingPanelLayout()
+    }
+}
+
+class MyFloatingPanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .tip
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea),
+        ]
+    }
+}
+```
+
+### Update your panel layout
+
+There are 2 ways to update the panel layout.
+
+1. Manually set `FloatingPanelController.layout` to the new layout object directly.
+
+```swift
+fpc.layout = MyPanelLayout()
+fpc.invalidateLayout() // If needed
+```
+
+2. Returns an appropriate layout object in one of 2 `floatingPanel(_:layoutFor:)` delegates.
 
 ```swift
 class ViewController: UIViewController, FloatingPanelControllerDelegate {
     ...
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
         return MyFloatingPanelLayout()
     }
-    ...
-}
 
-class MyFloatingPanelLayout: FloatingPanelLayout {
-    public var initialPosition: FloatingPanelPosition {
-        return .tip
-    }
-
-    public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-            case .full: return 16.0 // A top inset from safe area
-            case .half: return 216.0 // A bottom inset from the safe area
-            case .tip: return 44.0 // A bottom inset from the safe area
-        }
-    }
+    // OR
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor size: CGSize) -> FloatingPanelLayout {
+        return MyFloatingPanelLayout()
+    } 
 }
 ```
 
@@ -152,32 +309,105 @@ class MyFloatingPanelLayout: FloatingPanelLayout {
 ```swift
 class ViewController: UIViewController, FloatingPanelControllerDelegate {
     ...
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        return (newCollection.verticalSizeClass == .compact) ? FloatingPanelLandscapeLayout() : nil // Returning nil indicates to use the default layout
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        return (newCollection.verticalSizeClass == .compact) ? LandscapePanelLayout() : FloatingPanelBottomLayout()
+    }
+}
+
+class LandscapePanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .tip
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
+        ]
+    }
+    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
+        return [
+            surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
+            surfaceView.widthAnchor.constraint(equalToConstant: 291),
+        ]
+    }
+}
+```
+
+#### Use the intrinsic size of a content in your panel layout
+
+1. Lay out your content View with the intrinsic height size. For example, see "Detail View Controller scene"/"Intrinsic View Controller scene" of [Main.storyboard](https://github.com/SCENEE/FloatingPanel/blob/master/Examples/Samples/Sources/Base.lproj/Main.storyboard). The 'Stack View.bottom' constraint determines the intrinsic height.
+2. Specify layout anchors using `FloatingPanelIntrinsicLayoutAnchor`.
+
+```swift
+class IntrinsicPanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .full
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0, referenceGuide: .safeArea),
+            .half: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
+        ]
     }
     ...
 }
+```
 
-class FloatingPanelLandscapeLayout: FloatingPanelLayout {
-    public var initialPosition: FloatingPanelPosition {
-        return .tip
-    }
-    public var supportedPositions: Set<FloatingPanelPosition> {
-        return [.full, .tip]
-    }
+:pencil2: `FloatingPanelIntrinsicLayout` is deprecated on v1.
 
-    public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-            case .full: return 16.0
-            case .tip: return 69.0
-            default: return nil
+#### Specify an anchor for each state by an inset of the `FloatingPanelController.view` frame
+
+Use `.superview` reference guide in your anchors.
+
+```swift
+class MyFullScreenLayout: FloatingPanelLayout {
+    ...
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .superview),
+            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .superview),
+        ]
+
+    }
+}
+```
+
+:pencil2: `FloatingPanelFullScreenLayout` is deprecated on v1.
+
+#### Change the backdrop alpha
+
+You can change the backdrop alpha by `FloatingPanelLayout.backdropAlpha(for:)` for each state(`.full`, `.half` and `.tip`).
+
+For instance, if a panel seems like the backdrop view isn't there on `.half` state, it's time to implement the backdropAlpha API and return a value for the state as below.
+
+```swift
+class MyPanelLayout: FloatingPanelLayout {
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        switch state {
+        case .full, .half: return 0.3
+        default: return 0.0
         }
     }
+}
+```
 
-    public func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
+#### Using custome panel states
+
+You're able to define custom panel states and use them as the following example.
+
+```swift
+extension FloatingPanelState {
+    static let lastQuart: FloatingPanelState = FloatingPanelState(rawValue: "lastQuart", order: 750)
+    static let firstQuart: FloatingPanelState = FloatingPanelState(rawValue: "firstQuart", order: 250)
+}
+
+class FloatingPanelLayoutWithCustomState: FloatingPanelBottomLayout {
+    override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
         return [
-            surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuid.leftAnchor, constant: 8.0),
-            surfaceView.widthAnchor.constraint(equalToConstant: 291),
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .safeArea),
+            .lastQuart: FloatingPanelLayoutAnchor(fractionalInset: 0.75, edge: .bottom, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+            .firstQuart: FloatingPanelLayoutAnchor(fractionalInset: 0.25, edge: .bottom, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .bottom, referenceGuide: .safeArea),
         ]
     }
 }
@@ -190,54 +420,198 @@ class FloatingPanelLandscapeLayout: FloatingPanelLayout {
 ```swift
 class ViewController: UIViewController, FloatingPanelControllerDelegate {
     ...
-    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
-        return FloatingPanelStocksBehavior()
+    func viewDidLoad() {
+        ...
+        fpc.behavior =  CustomPanelBehavior()
     }
-    ...
 }
-...
 
-class FloatingPanelStocksBehavior: FloatingPanelBehavior {
-    var velocityThreshold: CGFloat {
-        return 15.0
+class CustomPanelBehavior: FloatingPanelBehavior {
+    let springDecelerationRate = UIScrollView.DecelerationRate.fast.rawValue + 0.02
+    let springResponseTime = 0.4
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool {
+        return true
     }
-
-    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
-        let damping = self.damping(with: velocity)
-        let springTiming = UISpringTimingParameters(dampingRatio: damping, initialVelocity: velocity)
-        return UIViewPropertyAnimator(duration: 0.5, timingParameters: springTiming)
-    }
-    ...
 }
 ```
 
+:pencil2: `floatingPanel(_ vc:behaviorFor:)` is deprecated on v1.
+
+#### Activate the rubber-band effect on panel edges
+
+```swift
+class MyPanelBehavior: FloatingPanelBehavior {
+    ...
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
+        return true
+    }
+}
+```
+
+#### Manage the projection of a pan gesture momentum
+
+This allows full projectional panel behavior. For example, a user can swipe up a panel from tip to full nearby the tip position.
+
+```swift
+class MyPanelBehavior: FloatingPanelBehavior {
+    ...
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelPosition) -> Bool {
+        return true
+    }
+}
+```
+
+### Specify the panel move's boundary
+
+`FloatingPanelController.surfaceLocation` in `floatingPanelDidMove(_:)` delegate method behaves like `UIScrollView.contentOffset` in `scrollViewDidScroll(_:)`.
+As a result, you can specify the boundary of a panel move as below.
+
+```swift
+func floatingPanelDidMove(_ vc: FloatingPanelController) {
+    if vc.isAttracting == false {
+        let loc = vc.surfaceLocation
+        let minY = vc.surfaceLocation(for: .full).y - 6.0
+        let maxY = vc.surfaceLocation(for: .tip).y + 6.0
+        vc.surfaceLocation = CGPoint(x: loc.x, y: min(max(loc.y, minY), maxY))
+    }
+}
+```
+
+:pencil2: `{top,bottom}InteractionBuffer` property is removed from `FloatingPanelLayout` since v2.
+
+### Customize the surface design
+
+#### Modify your surface appearance
+
+```swift
+// Create a new appearance.
+let appearance = SurfaceAppearance()
+
+// Define shadows
+let shadow = SurfaceAppearance.Shadow()
+shadow.color = UIColor.black
+shadow.offset = CGSize(width: 0, height: 16)
+shadow.radius = 16
+shadow.spread = 8
+appearance.shadows = [shadow]
+
+// Define corner radius and background color
+appearance.cornerRadius = 8.0
+appearance.backgroundColor = .clear
+
+// Set the new appearance
+fpc.surfaceView.appearance = appearance
+````
+
+#### Use a custom grabber handle
+
+```swift
+let myGrabberHandleView = MyGrabberHandleView()
+fpc.surfaceView.grabberHandle.isHidden = true
+fpc.surfaceView.addSubview(myGrabberHandleView)
+```
+
+#### Customize layout of the grabber handle
+
+```swift
+fpc.surfaceView.grabberHandlePadding = 10.0
+fpc.surfaceView.grabberHandleSize = .init(width: 44.0, height: 12.0)
+```
+
+:pencil2: Note that `grabberHandleSize` width and height are reversed in the left/right position.
+
+#### Customize content padding from surface edges
+
+```swift
+fpc.surfaceView.contentPadding = .init(top: 20, left: 20, bottom: 20, right: 20)
+```
+
+#### Customize margins of the surface edges
+
+```swift
+fpc.surfaceView.containerMargins = .init(top: 20.0, left: 16.0, bottom: 16.0, right: 16.0)
+```
+
+The feature can be used for these 2 kind panels
+
+* Facebook/Slack-like panel whose surface top edge is separated from the grabber handle.
+* iOS native panel to display AirPods information, for example.
+
+### Customize gestures
+
+#### Suppress the panel interaction
+
+You can disable the pan gesture recognizer directly
+
+```swift
+fpc.panGestureRecognizer.isEnabled = false
+```
+
+Or use this `FloatingPanelControllerDelegate` method.
+
+```swift
+func floatingPanelShouldBeginDragging(_ vc: FloatingPanelController) -> Bool {
+    return aCondition ?  false : true
+}
+```
+
+#### Add tap gestures to the surface view
+
+```swift
+override func viewDidLoad() {
+    ...
+    let surfaceTapGesture = UITapGestureRecognizer(target: self, action: #selector(handleSurface(tapGesture:)))
+    fpc.surfaceView.addGestureRecognizer(surfaceTapGesture)
+    surfaceTapGesture.isEnabled = (fpc.position == .tip)
+}
+
+// Enable `surfaceTapGesture` only at `tip` state
+func floatingPanelDidChangeState(_ vc: FloatingPanelController) {
+    surfaceTapGesture.isEnabled = (vc.position == .tip)
+}
+```
+
+#### Interrupt the delegate methods of `FloatingPanelController.panGestureRecognizer`
+
+If you are set `FloatingPanelController.panGestureRecognizer.delegateProxy` to an object adopting `UIGestureRecognizerDelegate`, it overrides delegate methods of the pan gesture recognizer.
+
+```swift
+class MyGestureRecognizerDelegate: UIGestureRecognizerDelegate {
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+}
+
+class ViewController: UIViewController {
+    let myGestureDelegate = MyGestureRecognizerDelegate()
+
+    func setUpFpc() {
+        ....
+        fpc.panGestureRecognizer.delegateProxy = myGestureDelegate
+    }
+```
+
 ### Create an additional floating panel for a detail
 
 ```swift
-class ViewController: UIViewController, FloatingPanelControllerDelegate {
-    var searchPanelVC: FloatingPanelController!
-    var detailPanelVC: FloatingPanelController!
+override func viewDidLoad() {
+    // Setup Search panel
+    self.searchPanelVC = FloatingPanelController()
 
-    override func viewDidLoad() {
-        // Setup Search panel
-        self.searchPanelVC = FloatingPanelController()
+    let searchVC = SearchViewController()
+    self.searchPanelVC.set(contentViewController: searchVC)
+    self.searchPanelVC.track(scrollView: contentVC.tableView)
 
-        let searchVC = SearchViewController()
-        self.searchPanelVC.set(contentViewController: searchVC)
-        self.searchPanelVC.track(scrollView: contentVC.tableView)
+    self.searchPanelVC.addPanel(toParent: self)
 
-        self.searchPanelVC.addPanel(toParent: self)
+    // Setup Detail panel
+    self.detailPanelVC = FloatingPanelController()
 
-        // Setup Detail panel
-        self.detailPanelVC = FloatingPanelController()
+    let contentVC = ContentViewController()
+    self.detailPanelVC.set(contentViewController: contentVC)
+    self.detailPanelVC.track(scrollView: contentVC.scrollView)
 
-        let contentVC = ContentViewController()
-        self.detailPanelVC.set(contentViewController: contentVC)
-        self.detailPanelVC.track(scrollView: contentVC.scrollView)
-
-        self.detailPanelVC.addPanel(toParent: self)
-    }
-    ...
+    self.detailPanelVC.addPanel(toParent: self)
 }
 ```
 
@@ -246,18 +620,26 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
 In the following example, I move a floating panel to full or half position while opening or closing a search bar like Apple Maps.
 
 ```swift
-    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
-        ...
-        fpc.move(to: .half, animated: true)
-    }
+func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
+    ...
+    fpc.move(to: .half, animated: true)
+}
 
-    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
-        ...
-        fpc.move(to: .full, animated: true)
-    }
+func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
+    ...
+    fpc.move(to: .full, animated: true)
+}
 ```
 
-### Make your contents correspond with a floating panel behavior
+You can also use a view animation to move a panel.
+
+```swift
+UIView.animate(withDuration: 0.25) {
+    self.fpc.move(to: .half, animated: false)
+}
+```
+
+### Work your contents together with a floating panel behavior
 
 ```swift
 class ViewController: UIViewController, FloatingPanelControllerDelegate {
@@ -269,20 +651,27 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
         }
     }
 
-    func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {
-        if targetPosition != .full {
+    func floatingPanelWillEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetState: UnsafeMutablePointer<FloatingPanelState>) {
+        if targetState.pointee != .full {
             searchVC.hideHeader()
         }
     }
-    ...
 }
 ```
 
+### Enabling the tap-to-dismiss action of the backdrop view
+
+The tap-to-dismiss action is disabled by default. So it needs to be enabled as below.
+
+```swift
+fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+```
+
 ## Notes
 
 ### 'Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller
 
-'Show' or 'Show Detail' segues from a content view controller will be managed by a view controller(hereinafter called 'master VC') adding a floating panel. Because a floating panel is just a subview of the master VC.
+'Show' or 'Show Detail' segues from a content view controller will be managed by a view controller(hereinafter called 'master VC') adding a floating panel. Because a floating panel is just a subview of the master VC(except for modality).
 
 `FloatingPanelController` has no way to manage a stack of view controllers like `UINavigationController`. If so, it would be so complicated and the interface will become `UINavigationController`. This component should not have the responsibility to manage the stack.
 
@@ -305,17 +694,22 @@ class ViewController: UIViewController {
 
         secondFpc.addPanel(toParent: self)
     }
-    ...
 }
 ```
 
-A `FloatingPanelController` object proxies an action for `show(_:sender)` to the master VC. That's why the master VC can handle a destination view controller of a 'Show' or 'Show Detail' segue and you can hook `show(_:sender)` to show a secondally floating panel set the destination view controller to the content.
+A `FloatingPanelController` object proxies an action for `show(_:sender)` to the master VC. That's why the master VC can handle a destination view controller of a 'Show' or 'Show Detail' segue and you can hook `show(_:sender)` to show a secondary floating panel set the destination view controller to the content.
 
-It's a greate way to decouple between a floating panel and the content VC.
+It's a great way to decouple between a floating panel and the content VC.
 
-###  FloatingPanelSurfaceView's issue on iOS 10
+### UISearchController issue
 
-* On iOS 10,   `FloatingPanelSurfaceView.cornerRadius` isn't not automatically masked with the top rounded corners  because of UIVisualEffectView issue. See https://forums.developer.apple.com/thread/50854. 
+`UISearchController` isn't able to be used with `FloatingPanelController` by the system design.
+
+Because `UISearchController` automatically presents itself modally when a user interacts with the search bar, and then it swaps the superview of the search bar to the view managed by itself while it displays. As a result, `FloatingPanelController` can't control the search bar when it's active, as you can see from [the screen shot](https://github.com/SCENEE/FloatingPanel/issues/248#issuecomment-521263831).
+
+### FloatingPanelSurfaceView's issue on iOS 10
+
+* On iOS 10, `FloatingPanelSurfaceView.cornerRadius` isn't not automatically masked with the top rounded corners  because of `UIVisualEffectView` issue. See https://forums.developer.apple.com/thread/50854. 
 So you need to draw top rounding corners of your content.  Here is an example in Examples/Maps.
 ```swift
 override func viewDidLayoutSubviews() {
@@ -326,11 +720,11 @@ override func viewDidLayoutSubviews() {
     }
 }
 ```
-* If you sets clear color to `FloatingPanelSurfaceView.backgroundColor`, please note the bottom overflow of your content on bouncing at full position. To prevent it, you need to expand your content. For example, See Example/Maps's Auto Layout settings of UIVisualEffectView in Main.storyborad.
+* If you sets clear color to `FloatingPanelSurfaceView.backgroundColor`, please note the bottom overflow of your content on bouncing at full position. To prevent it, you need to expand your content. For example, See Example/Maps App's Auto Layout settings of `UIVisualEffectView` in Main.storyboard.
 
-## Author
+## Maintainer
 
-Shin Yamamoto <shin@scenee.com>
+Shin Yamamoto <shin@scenee.com> | [@scenee](https://twitter.com/scenee)
 
 ## License
 

Sources/BackdropView.swift

@@ -0,0 +1,11 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+
+/// A view that presents a backdrop interface behind a panel.
+@objc(FloatingPanelBackdropView)
+public class BackdropView: UIView {
+
+    /// The gesture recognizer for tap gestures to dismiss a panel.
+    @objc public var dismissalTapGestureRecognizer: UITapGestureRecognizer!
+}

Sources/Behavior.swift

@@ -0,0 +1,126 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+
+/// An interface for generating behavior information to fine-tune the behavior of a panel.
+@objc
+public protocol FloatingPanelBehavior {
+    /// A floating-point value that determines the rate of oscillation magnitude reduction after the user lifts their finger.
+    ///
+    /// The oscillation magnitude to attract a panel to an anchor can be adjusted this value between 0.979 and 1.0
+    /// in increments of 0.001. When this value is around 0.979, the attraction uses a critically damped spring system.
+    /// When this value is between 0.978 and 1.0, it uses a underdamped spring system with a damping ratio computed by
+    /// this value. You shouldn't return less than 0.979 because the system is overdamped. If the pan gesture's velocity
+    /// is less than 300, this value is ignored and a panel applies a critically damped system.
+    @objc optional
+    var springDecelerationRate: CGFloat { get }
+
+    /// A floating-point value that determines the approximate time until a panel stops to an anchor after the user lifts their finger.
+    @objc optional
+    var springResponseTime: CGFloat { get }
+
+    /// Returns a deceleration rate to calculate a target position projected a dragging momentum.
+    ///
+    /// The default implementation of this method returns the normal deceleration rate of UIScrollView.
+    @objc optional
+    var momentumProjectionRate: CGFloat { get }
+
+    /// Asks the behavior if a panel should project a momentum of a user interaction to move the proposed position.
+    ///
+    /// The default implementation of this method returns true. This method is called for a layout to support all positions(tip, half and full).
+    /// Therefore, `proposedTargetPosition` can only be `FloatingPanelState.tip` or `FloatingPanelState.full`.
+    @objc optional
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool
+
+    /// Returns the progress to redirect to the previous position.
+    ///
+    /// The progress is represented by a floating-point value between 0.0 and 1.0, inclusive, where 1.0 indicates a panel is impossible to move to the next position. The default value is 0.5. Values less than 0.0 and greater than 1.0 are pinned to those limits.
+    @objc optional
+    func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelState, to: FloatingPanelState) -> CGFloat
+
+    /// Asks the behavior whether the rubber band effect is enabled in moving over a given edge of the surface view.
+    ///
+    /// This method allows a panel to activate the rubber band effect to a given edge of the surface view. By default, the effect is disabled.
+    @objc optional
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool
+    
+    /// Returns the velocity threshold for the default interactive removal gesture.
+    ///
+    /// In case `floatingPanel:shouldRemoveAt:with` is implemented, this value will not be used. The default value of `FloatingPanelDefaultBehavior` is 5.5
+    @objc optional
+    var removalInteractionVelocityThreshold: CGFloat { get }
+}
+
+/// The default behavior object for a panel
+///
+/// This behavior object is fine-tuned to behave as a search panel(card) in Apple Maps on iPhone portrait orientation.
+open class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
+    public init() {}
+
+    open var springDecelerationRate: CGFloat {
+        return UIScrollView.DecelerationRate.fast.rawValue + 0.001
+    }
+
+    open var springResponseTime: CGFloat {
+        return 0.4
+    }
+
+    open var momentumProjectionRate: CGFloat {
+        return UIScrollView.DecelerationRate.normal.rawValue
+    }
+
+    open func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelState, to: FloatingPanelState) -> CGFloat {
+        return 0.5
+    }
+
+    open func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
+        return false
+    }
+    
+    open var removalInteractionVelocityThreshold: CGFloat = 5.5
+}
+
+class BehaviorAdapter {
+    unowned let vc: FloatingPanelController
+    fileprivate var behavior: FloatingPanelBehavior
+
+    init(vc: FloatingPanelController, behavior: FloatingPanelBehavior) {
+        self.vc = vc
+        self.behavior = behavior
+    }
+
+    var springDecelerationRate: CGFloat {
+        behavior.springDecelerationRate ?? FloatingPanelDefaultBehavior().springDecelerationRate
+    }
+
+    var springResponseTime: CGFloat {
+        behavior.springResponseTime ?? FloatingPanelDefaultBehavior().springResponseTime
+    }
+
+    var momentumProjectionRate: CGFloat {
+        behavior.momentumProjectionRate ?? FloatingPanelDefaultBehavior().momentumProjectionRate
+    }
+    
+    var removalInteractionVelocityThreshold: CGFloat {
+        behavior.removalInteractionVelocityThreshold ?? FloatingPanelDefaultBehavior().removalInteractionVelocityThreshold
+    }
+
+    func redirectionalProgress(from: FloatingPanelState, to: FloatingPanelState) -> CGFloat {
+        behavior.redirectionalProgress?(vc, from: from, to: to) ?? FloatingPanelDefaultBehavior().redirectionalProgress(vc,from: from, to: to)
+    }
+
+    func shouldProjectMomentum(to: FloatingPanelState) -> Bool {
+        behavior.shouldProjectMomentum?(vc, to: to) ?? false
+    }
+
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
+        behavior.allowsRubberBanding?(for: edge) ?? false
+    }
+}
+
+extension FloatingPanelController {
+    var _behavior: FloatingPanelBehavior {
+        get { floatingPanel.behaviorAdapter.behavior }
+        set { floatingPanel.behaviorAdapter.behavior = newValue}
+    }
+}

Sources/Controller.swift

@@ -0,0 +1,713 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+
+/// A set of methods implemented by the delegate of a panel controller allows the adopting delegate to respond to
+/// messages from the FloatingPanelController class and thus respond to, and in some affect, operations such as
+/// dragging, attracting a panel, layout of a panel and the content, and transition animations.
+@objc public protocol FloatingPanelControllerDelegate {
+    /// Returns a FloatingPanelLayout object. If you use the default one, you can use a `FloatingPanelBottomLayout` object.
+    @objc(floatingPanel:layoutForTraitCollection:) optional
+    func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout
+
+    /// Returns a FloatingPanelLayout object. If you use the default one, you can use a `FloatingPanelBottomLayout` object.
+    @objc(floatingPanel:layoutForSize:) optional
+    func floatingPanel(_ fpc: FloatingPanelController, layoutFor size: CGSize) -> FloatingPanelLayout
+
+    /// Returns a UIViewPropertyAnimator object to add/present the  panel to a position.
+    ///
+    /// Default is the spring animation with 0.25 secs.
+    @objc(floatingPanel:animatorForPresentingToState:) optional
+    func floatingPanel(_ fpc: FloatingPanelController, animatorForPresentingTo state: FloatingPanelState) -> UIViewPropertyAnimator
+
+    /// Returns a UIViewPropertyAnimator object to remove/dismiss a panel from a position.
+    ///
+    /// Default is the spring animator with 0.25 secs.
+    @objc(floatingPanel:animatorForDismissingWithVelocity:) optional
+    func floatingPanel(_ fpc: FloatingPanelController, animatorForDismissingWith velocity: CGVector) -> UIViewPropertyAnimator
+
+    /// Called when a panel has changed to a new state.
+    ///
+    /// This can be called inside an animation block for presenting, dismissing a panel or moving a panel with your
+    /// animation. So any view properties set inside this function will be automatically animated alongside a panel.
+    @objc optional
+    func floatingPanelDidChangeState(_ fpc: FloatingPanelController)
+
+    /// Asks the delegate if dragging should begin by the pan gesture recognizer.
+    @objc optional
+    func floatingPanelShouldBeginDragging(_ fpc: FloatingPanelController) -> Bool
+
+    /// Called when the user drags the surface or the surface is attracted to a state anchor.
+    @objc optional
+    func floatingPanelDidMove(_ fpc: FloatingPanelController) // any surface frame changes in dragging
+
+    /// Called on start of dragging (may require some time and or distance to move)
+    @objc optional
+    func floatingPanelWillBeginDragging(_ fpc: FloatingPanelController)
+
+    /// Called on finger up if the user dragged. velocity is in points/second.
+    @objc optional
+    func floatingPanelWillEndDragging(_ fpc: FloatingPanelController, withVelocity velocity: CGPoint, targetState: UnsafeMutablePointer<FloatingPanelState>)
+
+    /// Called on finger up if the user dragged.
+    ///
+    /// If `attract` is true, it will continue moving afterwards to a nearby state anchor.
+    @objc optional
+    func floatingPanelDidEndDragging(_ fpc: FloatingPanelController, willAttract attract: Bool)
+
+    /// Called when it is about to be attracted to a state anchor.
+    @objc optional
+    func floatingPanelWillBeginAttracting(_ fpc: FloatingPanelController, to state: FloatingPanelState) // called on finger up as a panel are moving
+
+    /// Called when attracting it is completed.
+    @objc optional
+    func floatingPanelDidEndAttracting(_ fpc: FloatingPanelController) // called when a panel stops
+
+    /// Asks the delegate whether a panel should be removed when dragging ended at the specified location
+    ///
+    /// This delegate method is called only where `FloatingPanelController.isRemovalInteractionEnabled` is `true`.
+    /// The velocity vector is calculated from the distance to a point of the hidden state and the pan gesture's velocity.
+    @objc(floatingPanel:shouldRemoveAtLocation:withVelocity:)
+    optional
+    func floatingPanel(_ fpc: FloatingPanelController, shouldRemoveAt location: CGPoint, with velocity: CGVector) -> Bool
+
+    /// Called on start to remove its view controller from the parent view controller.
+    @objc(floatingPanelWillRemove:)
+    optional
+    func floatingPanelWillRemove(_ fpc: FloatingPanelController)
+
+    /// Called when a panel is removed from the parent view controller.
+    @objc optional
+    func floatingPanelDidRemove(_ fpc: FloatingPanelController)
+
+    /// Asks the delegate for a content offset of the tracking scroll view to be pinned when a panel moves
+    ///
+    /// If you do not implement this method, the controller uses a value of the content offset plus the content insets
+    /// of the tracked scroll view. Your implementation of this method can return a value for a navigation bar with a large
+    /// title, for example.
+    ///
+    /// This method will not be called if the controller doesn't track any scroll view.
+    @objc(floatingPanel:contentOffsetForPinningScrollView:)
+    optional
+    func floatingPanel(_ fpc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint
+}
+
+///
+/// A container view controller to display a panel to present contents in parallel as a user wants.
+///
+@objc
+open class FloatingPanelController: UIViewController {
+    /// Constants indicating how safe area insets are added to the adjusted content inset.
+    @objc
+    public enum ContentInsetAdjustmentBehavior: Int {
+        case always
+        case never
+    }
+
+    /// A flag used to determine how the controller object lays out the content view when the surface position changes.
+    @objc
+    public enum ContentMode: Int {
+        /// The option to fix the content to keep the height of the top most position.
+        case `static`
+        /// The option to scale the content to fit the bounds of the root view by changing the surface position.
+        case fitToBounds
+    }
+
+    /// The delegate of a panel controller object.
+    @objc 
+    public weak var delegate: FloatingPanelControllerDelegate?{
+        didSet{
+            didUpdateDelegate()
+        }
+    }
+
+    /// Returns the surface view managed by the controller object. It's the same as `self.view`.
+    @objc
+    public var surfaceView: SurfaceView! {
+        return floatingPanel.surfaceView
+    }
+
+    /// Returns the backdrop view managed by the controller object.
+    @objc
+    public var backdropView: BackdropView! {
+        return floatingPanel.backdropView
+    }
+
+    /// Returns the scroll view that the controller tracks.
+    @objc
+    public weak var trackingScrollView: UIScrollView? {
+        return floatingPanel.scrollView
+    }
+
+    // The underlying gesture recognizer for pan gestures
+    @objc
+    public var panGestureRecognizer: FloatingPanelPanGestureRecognizer {
+        return floatingPanel.panGestureRecognizer
+    }
+
+    /// The current position of a panel controller's contents.
+    @objc
+    public var state: FloatingPanelState {
+        return floatingPanel.state
+    }
+
+    /// A Boolean value indicating whether a panel controller is attracting the surface to a state anchor.
+    @objc
+    public var isAttracting: Bool {
+        return floatingPanel.isAttracting
+    }
+
+    /// The layout object managed by the controller
+    @objc
+    public var layout: FloatingPanelLayout {
+        get { _layout }
+        set {
+            _layout = newValue
+            if let parent = parent, let layout = newValue as? UIViewController, layout == parent {
+                log.warning("A memory leak will occur by a retain cycle because \(self) owns the parent view controller(\(parent)) as the layout object. Don't let the parent adopt FloatingPanelLayout.")
+            }
+        }
+    }
+
+    /// The behavior object managed by the controller
+    @objc
+    public var behavior: FloatingPanelBehavior {
+        get { _behavior }
+        set {
+            _behavior = newValue
+            if let parent = parent, let behavior = newValue as? UIViewController, behavior == parent {
+                log.warning("A memory leak will occur by a retain cycle because \(self) owns the parent view controller(\(parent)) as the behavior object. Don't let the parent adopt FloatingPanelBehavior.")
+            }
+        }
+    }
+
+    /// The content insets of the tracking scroll view derived from this safe area
+    @objc
+    public var adjustedContentInsets: UIEdgeInsets {
+        return floatingPanel.layoutAdapter.adjustedContentInsets
+    }
+
+    /// The behavior for determining the adjusted content offsets.
+    ///
+    /// This property specifies how the content area of the tracking scroll view is modified using `adjustedContentInsets`. The default value of this property is FloatingPanelController.ContentInsetAdjustmentBehavior.always.
+    @objc 
+    public var contentInsetAdjustmentBehavior: ContentInsetAdjustmentBehavior = .always
+
+    /// A Boolean value that determines whether the removal interaction is enabled.
+    @objc
+    public var isRemovalInteractionEnabled: Bool {
+        @objc(setRemovalInteractionEnabled:) set { floatingPanel.isRemovalInteractionEnabled = newValue }
+        @objc(isRemovalInteractionEnabled) get { return floatingPanel.isRemovalInteractionEnabled }
+    }
+
+    /// The view controller responsible for the content portion of a panel.
+    @objc
+    public var contentViewController: UIViewController? {
+        set { set(contentViewController: newValue) }
+        get { return _contentViewController }
+    }
+
+    /// The NearbyState determines that finger's nearby state.
+    public var nearbyState: FloatingPanelState {
+        let currentY = surfaceLocation.y
+        return floatingPanel.targetPosition(from: currentY, with: .zero)
+    }
+
+    /// Constants that define how a panel content fills in the surface.
+    @objc
+    public var contentMode: ContentMode = .static {
+        didSet {
+            guard state != .hidden else { return }
+            activateLayout(forceLayout: false)
+        }
+    }
+
+    private var _contentViewController: UIViewController?
+
+    private(set) var floatingPanel: Core!
+    private var preSafeAreaInsets: UIEdgeInsets = .zero // Capture the latest one
+    private var safeAreaInsetsObservation: NSKeyValueObservation?
+    private let modalTransition = ModalTransition()
+
+    required public init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        setUp()
+    }
+
+    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
+        super.init(nibName: nil, bundle: nil)
+        setUp()
+    }
+
+    /// Initialize a newly created panel controller.
+    @objc
+    public init(delegate: FloatingPanelControllerDelegate? = nil) {
+        super.init(nibName: nil, bundle: nil)
+        self.delegate = delegate
+        setUp()
+    }
+
+    private func setUp() {
+        _ = FloatingPanelController.dismissSwizzling
+
+        modalPresentationStyle = .custom
+        transitioningDelegate = modalTransition
+
+        let initialLayout: FloatingPanelLayout
+        if let layout = delegate?.floatingPanel?(self, layoutFor: traitCollection) {
+            initialLayout = layout
+        } else {
+            initialLayout = FloatingPanelBottomLayout()
+        }
+        let initialBehavior = FloatingPanelDefaultBehavior()
+
+        floatingPanel = Core(self, layout: initialLayout, behavior: initialBehavior)
+    }
+
+    private func didUpdateDelegate(){
+        if let layout = delegate?.floatingPanel?(self, layoutFor: traitCollection) {
+            _layout = layout
+        }
+    }
+
+    // MARK:- Overrides
+
+    /// Creates the view that the controller manages.
+    open override func loadView() {
+        assert(self.storyboard == nil, "Storyboard isn't supported")
+
+        let view = PassthroughView()
+        view.backgroundColor = .clear
+
+        backdropView.frame = view.bounds
+        view.addSubview(backdropView)
+
+        surfaceView.frame = view.bounds
+        view.addSubview(surfaceView)
+
+        self.view = view as UIView
+    }
+
+    open override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        if #available(iOS 11.0, *) {
+            // Ensure to update the static constraint of a panel after rotating a device in static mode
+            if contentMode == .static {
+                floatingPanel.layoutAdapter.updateStaticConstraint()
+            }
+        } else {
+            // Because {top,bottom}LayoutGuide is managed as a view
+            if floatingPanel.isAttracting == false {
+                self.update(safeAreaInsets: fp_safeAreaInsets)
+            }
+        }
+    }
+
+    open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
+        super.viewWillTransition(to: size, with: coordinator)
+
+        if self.view.bounds.size == size {
+            return
+        }
+
+        // Change a layout for the new view size
+        if let newLayout = self.delegate?.floatingPanel?(self, layoutFor: size) {
+            layout = newLayout
+            activateLayout(forceLayout: false)
+        }
+
+        if view.translatesAutoresizingMaskIntoConstraints {
+            view.frame.size = size
+            view.layoutIfNeeded()
+        }
+    }
+
+    open override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+        super.willTransition(to: newCollection, with: coordinator)
+
+        if shouldUpdateLayout(from: traitCollection, to: newCollection) == false {
+            return
+        }
+
+        // Change a layout for the new trait collection
+        if let newLayout = self.delegate?.floatingPanel?(self, layoutFor: newCollection) {
+            self.layout = newLayout
+            activateLayout(forceLayout: false)
+        }
+    }
+
+    open override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        safeAreaInsetsObservation = nil
+    }
+
+    // MARK:- Child view controller to consult
+    open override var childForStatusBarStyle: UIViewController? {
+        return contentViewController
+    }
+
+    open override var childForStatusBarHidden: UIViewController? {
+        return contentViewController
+    }
+
+    open override var childForScreenEdgesDeferringSystemGestures: UIViewController? {
+        return contentViewController
+    }
+
+    open override var childForHomeIndicatorAutoHidden: UIViewController? {
+        return contentViewController
+    }
+
+    // MARK:- Privates
+
+    private func shouldUpdateLayout(from previous: UITraitCollection, to new: UITraitCollection) -> Bool {
+        return previous.horizontalSizeClass != new.horizontalSizeClass
+            || previous.verticalSizeClass != new.verticalSizeClass
+            || previous.preferredContentSizeCategory != new.preferredContentSizeCategory
+            || previous.layoutDirection != new.layoutDirection
+    }
+
+    private func update(safeAreaInsets: UIEdgeInsets) {
+        guard
+            preSafeAreaInsets != safeAreaInsets
+            else { return }
+
+        log.debug("Update safeAreaInsets", safeAreaInsets)
+
+        // Prevent an infinite loop on iOS 10: setUpLayout() -> viewDidLayoutSubviews() -> setUpLayout()
+        preSafeAreaInsets = safeAreaInsets
+
+        // preserve the current content offset if contentInsetAdjustmentBehavior is `.always`
+        var contentOffset: CGPoint?
+        if contentInsetAdjustmentBehavior == .always {
+            contentOffset = trackingScrollView?.contentOffset
+        }
+
+        floatingPanel.layoutAdapter.updateStaticConstraint()
+
+        if let contentOffset = contentOffset {
+            trackingScrollView?.contentOffset = contentOffset
+        }
+
+        switch contentInsetAdjustmentBehavior {
+        case .always:
+            trackingScrollView?.contentInset = adjustedContentInsets
+        default:
+            break
+        }
+    }
+
+    private func activateLayout(forceLayout: Bool = false) {
+        floatingPanel.activateLayout(forceLayout: forceLayout,
+                                     contentInsetAdjustmentBehavior: contentInsetAdjustmentBehavior)
+    }
+
+    func remove() {
+        if presentingViewController != nil, parent == nil {
+            delegate?.floatingPanelWillRemove?(self)
+            dismiss(animated: true) { [weak self] in
+                guard let self = self else { return }
+                self.delegate?.floatingPanelDidRemove?(self)
+            }
+        } else {
+            removePanelFromParent(animated: true)
+        }
+    }
+
+    // MARK: - Container view controller interface
+
+    /// Shows the surface view at the initial position defined by the current layout
+    /// - Parameters:
+    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
+    ///     - completion: The block to execute after the presentation finishes. This block has no return value and takes no parameters. You may specify nil for this parameter.
+    @objc(show:completion:)
+    public func show(animated: Bool = false, completion: (() -> Void)? = nil) {
+        // Must apply the current layout here
+        activateLayout(forceLayout: true)
+
+        if #available(iOS 11.0, *) {
+            // Must track the safeAreaInsets of `self.view` to update the layout.
+            // There are 2 reasons.
+            // 1. This or the parent VC doesn't call viewSafeAreaInsetsDidChange() on the bottom
+            // inset's update expectedly.
+            // 2. The safe area top inset can be variable on the large title navigation bar(iOS11+).
+            // That's why it needs the observation to keep `adjustedContentInsets` correct.
+            safeAreaInsetsObservation = self.view.observe(\.safeAreaInsets, options: [.initial, .new, .old]) { [weak self] (_, change) in
+                // Use `self.view.safeAreaInsets` because `change.newValue` can be nil in particular case when
+                // is reported in https://github.com/SCENEE/FloatingPanel/issues/330
+                guard let self = self, change.oldValue != self.view.safeAreaInsets else { return }
+                self.update(safeAreaInsets: self.view.safeAreaInsets)
+            }
+        } else {
+            // KVOs for topLayoutGuide & bottomLayoutGuide are not effective.
+            // Instead, update(safeAreaInsets:) is called at `viewDidLayoutSubviews()`
+        }
+
+        move(to: floatingPanel.layoutAdapter.initialState,
+             animated: animated,
+             completion: completion)
+    }
+
+    /// Hides the surface view to the hidden position
+    @objc(hide:completion:)
+    public func hide(animated: Bool = false, completion: (() -> Void)? = nil) {
+        move(to: .hidden,
+             animated: animated,
+             completion: completion)
+    }
+
+    /// Adds the view managed by the controller as a child of the specified view controller.
+    /// - Parameters:
+    ///     - parent: A parent view controller object that displays FloatingPanelController's view. A container view controller object isn't applicable.
+    ///     - viewIndex: Insert the surface view managed by the controller below the specified view index. By default, the surface view will be added to the end of the parent list of subviews.
+    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
+    ///     - completion: The block to execute after the presentation finishes. This block has no return value and takes no parameters. You may specify nil for this parameter.
+    @objc(addPanelToParent:at:animated:completion:)
+    public func addPanel(toParent parent: UIViewController, at viewIndex: Int = -1, animated: Bool = false, completion: (() -> Void)? = nil) {
+        guard self.parent == nil else {
+            log.warning("Already added to a parent(\(parent))")
+            return
+        }
+        assert((parent is UINavigationController) == false, "UINavigationController displays only one child view controller at a time.")
+        assert((parent is UITabBarController) == false, "UITabBarController displays child view controllers with a radio-style selection interface")
+        assert((parent is UISplitViewController) == false, "UISplitViewController manages two child view controllers in a master-detail interface")
+        assert((parent is UITableViewController) == false, "UITableViewController should not be the parent because the view is a table view so that a panel doesn't work well")
+        assert((parent is UICollectionViewController) == false, "UICollectionViewController should not be the parent because the view is a collection view so that a panel doesn't work well")
+
+        if viewIndex < 0 {
+            parent.view.addSubview(self.view)
+        } else {
+            parent.view.insertSubview(self.view, at: viewIndex)
+        }
+
+        parent.addChild(self)
+
+        view.frame = parent.view.bounds // Needed for a correct safe area configuration
+        view.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            self.view.topAnchor.constraint(equalTo: parent.view.topAnchor, constant: 0.0),
+            self.view.leftAnchor.constraint(equalTo: parent.view.leftAnchor, constant: 0.0),
+            self.view.rightAnchor.constraint(equalTo: parent.view.rightAnchor, constant: 0.0),
+            self.view.bottomAnchor.constraint(equalTo: parent.view.bottomAnchor, constant: 0.0),
+            ])
+
+        show(animated: animated) { [weak self] in
+            guard let self = self else { return }
+            self.didMove(toParent: parent)
+            completion?()
+        }
+    }
+
+    /// Removes the controller and the managed view from its parent view controller
+    /// - Parameters:
+    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
+    ///     - completion: The block to execute after the view controller is dismissed. This block has no return value and takes no parameters. You may specify nil for this parameter.
+    @objc(removePanelFromParent:completion:)
+    public func removePanelFromParent(animated: Bool, completion: (() -> Void)? = nil) {
+        guard self.parent != nil else {
+            completion?()
+            return
+        }
+
+        delegate?.floatingPanelWillRemove?(self)
+
+        hide(animated: animated) { [weak self] in
+            guard let self = self else { return }
+
+            self.willMove(toParent: nil)
+
+            self.view.removeFromSuperview()
+
+            self.removeFromParent()
+
+            self.delegate?.floatingPanelDidRemove?(self)
+            completion?()
+        }
+    }
+
+    /// Moves the position to the specified position.
+    ///
+    /// - Parameters:
+    ///     - to: Pass a FloatingPanelPosition value to move the surface view to the position.
+    ///     - animated: Pass true to animate the presentation; otherwise, pass false.
+    ///     - completion: The block to execute after the view controller has finished moving. This block has no return value and takes no parameters. You may specify nil for this parameter.
+    @objc(moveToState:animated:completion:)
+    public func move(to: FloatingPanelState, animated: Bool, completion: (() -> Void)? = nil) {
+        floatingPanel.move(to: to, animated: animated, completion: completion)
+    }
+
+    /// Sets the view controller responsible for the content portion of a panel.
+    public func set(contentViewController: UIViewController?) {
+        if let vc = _contentViewController {
+            vc.willMove(toParent: nil)
+            vc.view.removeFromSuperview()
+            vc.removeFromParent()
+        }
+
+        if let vc = contentViewController {
+            addChild(vc)
+
+            let surfaceView = floatingPanel.surfaceView
+            surfaceView.set(contentView: vc.view)
+
+            vc.didMove(toParent: self)
+        }
+
+        _contentViewController = contentViewController
+    }
+
+    // MARK: - Scroll view tracking
+
+    /// Tracks the specified scroll view to correspond with the scroll.
+    ///
+    /// - Parameters:
+    ///     - scrollView: Specify a scroll view to continuously and seamlessly work in concert with interactions of the surface view
+    @objc(trackScrollView:)
+    public func track(scrollView: UIScrollView) {
+        if let scrollView = floatingPanel.scrollView {
+            untrack(scrollView: scrollView)
+        }
+
+        floatingPanel.scrollView = scrollView
+
+        switch contentInsetAdjustmentBehavior {
+        case .always:
+            if #available(iOS 11.0, *) {
+                scrollView.contentInsetAdjustmentBehavior = .never
+            } else {
+                children.forEach { (vc) in
+                    vc.automaticallyAdjustsScrollViewInsets = false
+                }
+            }
+        default:
+            break
+        }
+    }
+
+    /// Cancel tracking the specify scroll view.
+    ///
+    @objc(untrackScrollView:)
+    public func untrack(scrollView: UIScrollView) {
+        if floatingPanel.scrollView == scrollView {
+            floatingPanel.scrollView = nil
+        }
+    }
+
+    // MARK: - Accessibility
+
+    open override func accessibilityPerformEscape() -> Bool {
+        guard isRemovalInteractionEnabled else { return false }
+        dismiss(animated: true, completion: nil)
+        return true
+    }
+
+    // MARK: - Utilities
+
+    /// Updates the layout object from the delegate and lays out the views managed
+    /// by the controller immediately.
+    ///
+    /// This method updates the `FloatingPanelLayout` object from the delegate and
+    /// then it calls `layoutIfNeeded()` of the root view to force the view
+    /// to update the layout immediately. It can be called in an
+    /// animation block.
+    @objc
+    public func invalidateLayout() {
+        activateLayout(forceLayout: true)
+    }
+
+    /// Returns the surface's position in a panel controller's view for the specified state.
+    ///
+    /// If a panel is top positioned, this returns a point of the bottom-left corner of the surface. If it is left positioned
+    /// this returns a point of top-right corner of the surface. If it is bottom or right positioned, this returns a point
+    /// of the top-left corner of the surface.
+    @objc
+    public func surfaceLocation(for state: FloatingPanelState) -> CGPoint {
+        return floatingPanel.layoutAdapter.surfaceLocation(for: state)
+    }
+
+    /// The surface's position in a panel controller's view.
+    ///
+    /// If a panel is top positioned, this returns a point of the bottom-left corner of the surface. If it is left positioned
+    /// this returns a point of top-right corner of the surface. If it is bottom or right positioned, this returns a point
+    /// of the top-left corner of the surface.
+    @objc
+    public var surfaceLocation: CGPoint {
+        get { floatingPanel.layoutAdapter.surfaceLocation }
+        set { floatingPanel.layoutAdapter.surfaceLocation = newValue }
+    }
+}
+
+extension FloatingPanelController {
+    func notifyDidMove() {
+        #if !TEST
+        guard self.view.window != nil else { return }
+        #endif
+        delegate?.floatingPanelDidMove?(self)
+    }
+
+    func animatorForPresenting(to: FloatingPanelState) -> UIViewPropertyAnimator {
+        if let animator = delegate?.floatingPanel?(self, animatorForPresentingTo: to) {
+            return animator
+        }
+        let timingParameters = UISpringTimingParameters(decelerationRate: UIScrollView.DecelerationRate.fast.rawValue,
+                                                       frequencyResponse: 0.25)
+        return UIViewPropertyAnimator(duration: 0.0,
+                                      timingParameters: timingParameters)
+    }
+
+    func animatorForDismissing(with velocity: CGVector) -> UIViewPropertyAnimator {
+        if let animator = delegate?.floatingPanel?(self, animatorForDismissingWith: velocity) {
+            return animator
+        }
+        let timingParameters = UISpringTimingParameters(decelerationRate: UIScrollView.DecelerationRate.fast.rawValue,
+                                                       frequencyResponse: 0.25,
+                                                       initialVelocity: velocity)
+        return UIViewPropertyAnimator(duration: 0.0,
+                                      timingParameters: timingParameters)
+    }
+}
+
+extension FloatingPanelController {
+    private static let dismissSwizzling: Void = {
+        let aClass: AnyClass! = UIViewController.self //object_getClass(vc)
+        if let imp = class_getMethodImplementation(aClass, #selector(dismiss(animated:completion:))),
+            let originalAltMethod = class_getInstanceMethod(aClass, #selector(fp_original_dismiss(animated:completion:))) {
+            method_setImplementation(originalAltMethod, imp)
+        }
+        let originalMethod = class_getInstanceMethod(aClass, #selector(dismiss(animated:completion:)))
+        let swizzledMethod = class_getInstanceMethod(aClass, #selector(fp_dismiss(animated:completion:)))
+        if let originalMethod = originalMethod, let swizzledMethod = swizzledMethod {
+            method_exchangeImplementations(originalMethod, swizzledMethod)
+        }
+    }()
+}
+
+public extension UIViewController {
+    @objc func fp_original_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+        // Implementation will be replaced by IMP of self.dismiss(animated:completion:)
+    }
+    @objc func fp_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+        // Call dismiss(animated:completion:) to a content view controller
+        if let fpc = parent as? FloatingPanelController {
+            if fpc.presentingViewController != nil {
+                self.fp_original_dismiss(animated: flag, completion: completion)
+            } else {
+                fpc.removePanelFromParent(animated: flag, completion: completion)
+            }
+            return
+        }
+        // Call dismiss(animated:completion:) to FloatingPanelController directly
+        if let fpc = self as? FloatingPanelController {
+            // When a panel is presented modally and it's not a child view controller of the presented view controller.
+            if fpc.presentingViewController != nil, fpc.parent == nil {
+                self.fp_original_dismiss(animated: flag, completion: completion)
+            } else {
+                fpc.removePanelFromParent(animated: flag, completion: completion)
+            }
+            return
+        }
+
+        // For other view controllers
+        self.fp_original_dismiss(animated: flag, completion: completion)
+    }
+}