Add build-tools package for the command and build tool plugins

For backward compat, build-tools package isn't added to FloatingPanel
project file as a local package. Because it breaks builds on Xcode 14.2
or earlier according to the swift version.

I confirmed this behavior was improved on Xcode 15 beta.

But so far we need to add the build-tools package into the project
file manually as a local package to work the build tool plugin.

.github/workflows/ci.yml

@@ -9,6 +9,34 @@ on:
       - '*'
 
 jobs:
+  lint:
+    runs-on: ${{ matrix.runsOn }}
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      SWIFT_FORMAT: build-tools/.build/release/swift-format
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - xcode: "14.3"
+            runsOn: macos-13
+    steps:
+      - uses: actions/checkout@v3
+      - name: Cache swift-format
+        id: cache_swift-format
+        uses: actions/cache@v3
+        env:
+          cache-name: cache_swift-format
+        with:
+          path: ${{ env.SWIFT_FORMAT }}
+          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('build-tools/Package.resolved') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('build-tools/Package.resolved') }}
+      - name: Run swift-format
+        run: |
+          [[ -f $SWIFT_FORMAT ]] || xcrun swift build --package-path "build-tools" -c release
+          $SWIFT_FORMAT lint --configuration .swift-format -s -r Sources Tests
+
   build:
     runs-on: ${{ matrix.runsOn }}
     env:

.swift-format

@@ -0,0 +1,56 @@
+{
+  "fileScopedDeclarationPrivacy" : {
+    "accessLevel" : "private"
+  },
+  "indentation" : {
+    "spaces" : 4
+  },
+  "indentConditionalCompilationBlocks" : false,
+  "indentSwitchCaseLabels" : false,
+  "lineBreakAroundMultilineExpressionChainComponents" : false,
+  "lineBreakBeforeControlFlowKeywords" : false,
+  "lineBreakBeforeEachArgument" : false,
+  "lineBreakBeforeEachGenericRequirement" : false,
+  "lineLength" : 240,
+  "maximumBlankLines" : 1,
+  "prioritizeKeepingFunctionOutputTogether" : false,
+  "respectsExistingLineBreaks" : true,
+  "rules" : {
+    "AllPublicDeclarationsHaveDocumentation" : false,
+    "AlwaysUseLowerCamelCase" : false,
+    "AmbiguousTrailingClosureOverload" : true,
+    "BeginDocumentationCommentWithOneLineSummary" : false,
+    "DoNotUseSemicolons" : true,
+    "DontRepeatTypeInStaticProperties" : true,
+    "FileScopedDeclarationPrivacy" : true,
+    "FullyIndirectEnum" : true,
+    "GroupNumericLiterals" : true,
+    "IdentifiersMustBeASCII" : true,
+    "NeverForceUnwrap" : true,
+    "NeverUseForceTry" : true,
+    "NeverUseImplicitlyUnwrappedOptionals" : false,
+    "NoAccessLevelOnExtensionDeclaration" : true,
+    "NoBlockComments" : true,
+    "NoCasesWithOnlyFallthrough" : true,
+    "NoEmptyTrailingClosureParentheses" : true,
+    "NoLabelsInCasePatterns" : true,
+    "NoLeadingUnderscores" : false,
+    "NoParensAroundConditions" : true,
+    "NoVoidReturnOnFunctionSignature" : true,
+    "OneCasePerLine" : true,
+    "OneVariableDeclarationPerLine" : true,
+    "OnlyOneTrailingClosureArgument" : true,
+    "OrderedImports" : true,
+    "ReturnVoidInsteadOfEmptyTuple" : true,
+    "UseEarlyExits" : false,
+    "UseLetInEveryBoundCaseVariable" : true,
+    "UseShorthandTypeNames" : true,
+    "UseSingleLinePropertyGetter" : true,
+    "UseSynthesizedInitializer" : true,
+    "UseTripleSlashForDocumentationComments" : true,
+    "UseWhereClausesInForLoops" : false,
+    "ValidateDocumentationComments" : false
+  },
+  "tabWidth" : 8,
+  "version" : 1
+}

FloatingPanel.xcodeproj/project.pbxproj

@@ -190,6 +190,7 @@
 			buildRules = (
 			);
 			dependencies = (
+				54B58FC929EB95880009567E /* PBXTargetDependency */,
 			);
 			name = FloatingPanel;
 			productName = FloatingModalController;
@@ -242,6 +243,8 @@
 				Base,
 			);
 			mainGroup = 545DB9B72151169500CA77B8;
+			packageReferences = (
+			);
 			productRefGroup = 545DB9C22151169500CA77B8 /* Products */;
 			projectDirPath = "";
 			projectRoot = "";
@@ -315,6 +318,10 @@
 			target = 545DB9C02151169500CA77B8 /* FloatingPanel */;
 			targetProxy = 545DB9CC2151169500CA77B8 /* PBXContainerItemProxy */;
 		};
+		54B58FC929EB95880009567E /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			productRef = 54B58FC829EB95880009567E /* SwiftFormatBuildTool */;
+		};
 /* End PBXTargetDependency section */
 
 /* Begin XCBuildConfiguration section */
@@ -694,6 +701,13 @@
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		54B58FC829EB95880009567E /* SwiftFormatBuildTool */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = "plugin:SwiftFormatBuildTool";
+		};
+/* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = 545DB9B82151169500CA77B8 /* Project object */;
 }

Sources/Behavior.swift

@@ -12,43 +12,43 @@ public protocol FloatingPanelBehavior {
     /// 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 }
+    @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 }
+    @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 }
+    @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
+    @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
+    @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
-    
+    @objc
+    optional func allowsRubberBanding(for edge: UIRectEdge) -> Bool
+
     /// Returns the velocity threshold for the default interactive removal gesture.
     ///
     /// In case ``FloatingPanel/FloatingPanelControllerDelegate/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 }
+    @objc
+    optional var removalInteractionVelocityThreshold: CGFloat { get }
 }
 
 /// The default behavior object for a panel
@@ -76,7 +76,7 @@ open class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
     open func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
         return false
     }
-    
+
     open var removalInteractionVelocityThreshold: CGFloat = 5.5
 }
 
@@ -100,13 +100,13 @@ class BehaviorAdapter {
     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)
+        behavior.redirectionalProgress?(vc, from: from, to: to) ?? FloatingPanelDefaultBehavior().redirectionalProgress(vc, from: from, to: to)
     }
 
     func shouldProjectMomentum(to: FloatingPanelState) -> Bool {
@@ -121,6 +121,6 @@ class BehaviorAdapter {
 extension FloatingPanelController {
     var _behavior: FloatingPanelBehavior {
         get { floatingPanel.behaviorAdapter.behavior }
-        set { floatingPanel.behaviorAdapter.behavior = newValue}
+        set { floatingPanel.behaviorAdapter.behavior = newValue }
     }
 }

Sources/Controller.swift

@@ -7,78 +7,76 @@ import UIKit
 /// 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
+    @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
+    @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
+    @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
+    @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)
+    @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
+    @objc
+    optional func floatingPanelShouldBeginDragging(_ fpc: FloatingPanelController) -> Bool
 
     /// Called while the user drags the surface or the surface moves to a state anchor.
-    @objc optional
-    func floatingPanelDidMove(_ fpc: FloatingPanelController)
+    @objc
+    optional func floatingPanelDidMove(_ fpc: FloatingPanelController)
 
     /// Called on start of dragging (may require some time and or distance to move)
-    @objc optional
-    func floatingPanelWillBeginDragging(_ fpc: FloatingPanelController)
+    @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>)
+    @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)
+    @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
+    @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
+    @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 ``FloatingPanel/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
+    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)
+    optional func floatingPanelWillRemove(_ fpc: FloatingPanelController)
 
     /// Called when a panel is removed from the parent view controller.
-    @objc optional
-    func floatingPanelDidRemove(_ fpc: FloatingPanelController)
+    @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
     ///
@@ -88,8 +86,7 @@ import UIKit
     ///
     /// 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
+    optional func floatingPanel(_ fpc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint
 }
 
 ///
@@ -114,9 +111,9 @@ open class FloatingPanelController: UIViewController {
     }
 
     /// The delegate of a panel controller object.
-    @objc 
-    public weak var delegate: FloatingPanelControllerDelegate?{
-        didSet{
+    @objc
+    public weak var delegate: FloatingPanelControllerDelegate? {
+        didSet {
             didUpdateDelegate()
         }
     }
@@ -193,7 +190,7 @@ open class FloatingPanelController: UIViewController {
     /// 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 
+    @objc
     public var contentInsetAdjustmentBehavior: ContentInsetAdjustmentBehavior = .always
 
     /// A Boolean value that determines whether the removal interaction is enabled.
@@ -228,7 +225,7 @@ open class FloatingPanelController: UIViewController {
     private var _contentViewController: UIViewController?
 
     private(set) var floatingPanel: Core!
-    private var preSafeAreaInsets: UIEdgeInsets = .zero // Capture the latest one
+    private var preSafeAreaInsets: UIEdgeInsets = .zero  // Capture the latest one
     private var safeAreaInsetsObservation: NSKeyValueObservation?
     private let modalTransition = ModalTransition()
 
@@ -267,7 +264,7 @@ open class FloatingPanelController: UIViewController {
         floatingPanel = Core(self, layout: initialLayout, behavior: initialBehavior)
     }
 
-    private func didUpdateDelegate(){
+    private func didUpdateDelegate() {
         if let layout = delegate?.floatingPanel?(self, layoutFor: traitCollection) {
             _layout = layout
         }
@@ -373,7 +370,7 @@ open class FloatingPanelController: UIViewController {
     private func update(safeAreaInsets: UIEdgeInsets) {
         guard
             preSafeAreaInsets != safeAreaInsets
-            else { return }
+        else { return }
 
         log.debug("Update safeAreaInsets", safeAreaInsets)
 
@@ -454,17 +451,21 @@ open class FloatingPanelController: UIViewController {
             // Instead, update(safeAreaInsets:) is called at `viewDidLayoutSubviews()`
         }
 
-        move(to: floatingPanel.layoutAdapter.initialState,
-             animated: animated,
-             completion: completion)
+        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)
+        move(
+            to: .hidden,
+            animated: animated,
+            completion: completion
+        )
     }
 
     /// Adds the view managed by the controller as a child of the specified view controller.
@@ -493,14 +494,14 @@ open class FloatingPanelController: UIViewController {
 
         parent.addChild(self)
 
-        view.frame = parent.view.bounds // Needed for a correct safe area configuration
+        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 }
@@ -594,7 +595,7 @@ open class FloatingPanelController: UIViewController {
             break
         }
     }
-    
+
     /// [Experimental] Allows the panel to move as its tracking scroll view bounces.
     ///
     /// This method must be called in the delegate method, `UIScrollViewDelegate.scrollViewDidScroll(_:)`,
@@ -674,21 +675,27 @@ extension FloatingPanelController {
         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)
+        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)
+        let timingParameters = UISpringTimingParameters(
+            decelerationRate: UIScrollView.DecelerationRate.fast.rawValue,
+            frequencyResponse: 0.25,
+            initialVelocity: velocity)
+        return UIViewPropertyAnimator(
+            duration: 0.0,
+            timingParameters: timingParameters
+        )
     }
 }
 
@@ -698,10 +705,11 @@ private var originalDismissImp: IMP?
 private typealias __dismissFunction = @convention(c) (AnyObject, Selector, Bool, (() -> Void)?) -> Void
 extension FloatingPanelController {
     private static let dismissSwizzling: Void = {
-        let aClass: AnyClass! = UIViewController.self //object_getClass(vc)
+        let aClass: AnyClass! = UIViewController.self  //object_getClass(vc)
         if let originalMethod = class_getInstanceMethod(aClass, #selector(dismiss(animated:completion:))),
-           let swizzledImp = class_getMethodImplementation(aClass, #selector(__swizzled_dismiss(animated:completion:))) {
-           originalDismissImp = method_setImplementation(originalMethod, swizzledImp)
+            let swizzledImp = class_getMethodImplementation(aClass, #selector(__swizzled_dismiss(animated:completion:)))
+        {
+            originalDismissImp = method_setImplementation(originalMethod, swizzledImp)
         }
     }()
 }

Sources/Core.swift

@@ -43,7 +43,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     let panGestureRecognizer: FloatingPanelPanGestureRecognizer
     var isRemovalInteractionEnabled: Bool = false
 
-    fileprivate var isSuspended: Bool = false // Prevent a memory leak in the modal transition
+    fileprivate var isSuspended: Bool = false  // Prevent a memory leak in the modal transition
     fileprivate var transitionAnimator: UIViewPropertyAnimator?
     fileprivate var moveAnimator: NumericSpringAnimator?
 
@@ -148,7 +148,8 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                 return
             }
 
-            let shouldDoubleLayout = from == .hidden
+            let shouldDoubleLayout =
+                from == .hidden
                 && surfaceView.hasStackView()
                 && layoutAdapter.isIntrinsicAnchor(state: to)
 
@@ -228,7 +229,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     func getBackdropAlpha(at cur: CGFloat, with translation: CGFloat) -> CGFloat {
-        /* log.debug("currentY: \(currentY) translation: \(translation)") */
+        // log.debug("currentY: \(currentY) translation: \(translation)")
         let forwardY = (translation >= 0)
 
         let segment = layoutAdapter.segment(at: cur, forward: forwardY)
@@ -248,30 +249,32 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         if pre == next {
             return preAlpha
         }
-        return preAlpha + max(min(1.0, 1.0 - (next - cur) / (next - pre) ), 0.0) * (nextAlpha - preAlpha)
+        return preAlpha + max(min(1.0, 1.0 - (next - cur) / (next - pre)), 0.0) * (nextAlpha - preAlpha)
     }
 
     // MARK: - UIGestureRecognizerDelegate
 
-    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
-                                  shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+    public func gestureRecognizer(
+        _ gestureRecognizer: UIGestureRecognizer,
+        shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer
+    ) -> Bool {
         if let result = panGestureRecognizer.delegateProxy?.gestureRecognizer?(gestureRecognizer, shouldRecognizeSimultaneouslyWith: otherGestureRecognizer) {
             return result
         }
 
         guard gestureRecognizer == panGestureRecognizer else { return false }
 
-        /* log.debug("shouldRecognizeSimultaneouslyWith", otherGestureRecognizer) */
+        // log.debug("shouldRecognizeSimultaneouslyWith", otherGestureRecognizer)
 
         switch otherGestureRecognizer {
         case is FloatingPanelPanGestureRecognizer:
             // All visible panels' pan gesture should be recognized simultaneously.
             return true
         case is UIPanGestureRecognizer,
-             is UISwipeGestureRecognizer,
-             is UIRotationGestureRecognizer,
-             is UIScreenEdgePanGestureRecognizer,
-             is UIPinchGestureRecognizer:
+            is UISwipeGestureRecognizer,
+            is UIRotationGestureRecognizer,
+            is UIScreenEdgePanGestureRecognizer,
+            is UIPinchGestureRecognizer:
             if surfaceView.grabberAreaContains(gestureRecognizer.location(in: surfaceView)) {
                 return true
             }
@@ -297,8 +300,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                 return true
             }
         }
-        if #available(iOS 11.0, *),
-            otherGestureRecognizer.name == "_UISheetInteractionBackgroundDismissRecognizer" {
+        if #available(iOS 11.0, *), otherGestureRecognizer.name == "_UISheetInteractionBackgroundDismissRecognizer" {
             // The dismiss gesture of a sheet modal should not begin until the pan gesture fails.
             return true
         }
@@ -328,7 +330,8 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             // On short contents scroll, `_UISwipeActionPanGestureRecognizer` blocks
             // the panel's pan gesture if not returns false
             if let scrollGestureRecognizers = scrollView.gestureRecognizers,
-                scrollGestureRecognizers.contains(otherGestureRecognizer) {
+                scrollGestureRecognizers.contains(otherGestureRecognizer)
+            {
                 switch otherGestureRecognizer {
                 case scrollView.panGestureRecognizer:
                     if surfaceView.grabberAreaContains(gestureRecognizer.location(in: surfaceView)) {
@@ -350,12 +353,11 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             }
             return true
         case is UIPanGestureRecognizer,
-             is UISwipeGestureRecognizer,
-             is UIRotationGestureRecognizer,
-             is UIScreenEdgePanGestureRecognizer,
-             is UIPinchGestureRecognizer:
-            if #available(iOS 11.0, *),
-                otherGestureRecognizer.name == "_UISheetInteractionBackgroundDismissRecognizer" {
+            is UISwipeGestureRecognizer,
+            is UIRotationGestureRecognizer,
+            is UIScreenEdgePanGestureRecognizer,
+            is UIPinchGestureRecognizer:
+            if #available(iOS 11.0, *), otherGestureRecognizer.name == "_UISheetInteractionBackgroundDismissRecognizer" {
                 // Should begin the pan gesture without waiting the dismiss gesture of a sheet modal.
                 return false
             }
@@ -387,13 +389,15 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
             let insideMostExpandedAnchor = 0 > layoutAdapter.offsetFromMostExpandedAnchor + (1.0 / surfaceView.fp_displayScale)
 
-            log.debug("""
+            log.debug(
+                """
                 scroll gesture(\(state):\(panGesture.state)) -- \
                 inside expanded anchor = \(insideMostExpandedAnchor), \
                 interactionInProgress = \(interactionInProgress), \
                 scroll offset = \(value(of: scrollView.contentOffset)), \
                 location = \(value(of: location)), velocity = \(velocity)
-                """)
+                """
+            )
 
             let offsetDiff = value(of: scrollView.contentOffset - contentOffsetForPinning(of: scrollView))
 
@@ -479,19 +483,22 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                 }
             }
         case panGestureRecognizer:
-            let translation = panGesture.translation(in: panGestureRecognizer.view!.superview)
+            let translation = panGesture.translation(in: panGesture.view?.superview)
             let velocity = panGesture.velocity(in: panGesture.view)
             let location = panGesture.location(in: panGesture.view)
 
-            log.debug("""
+            log.debug(
+                """
                 panel gesture(\(state):\(panGesture.state)) -- \
                 translation =  \(value(of: translation)), \
                 location = \(value(of: location)), \
                 velocity = \(value(of: velocity))
-                """)
+                """
+            )
 
             if interactionInProgress == false, isAttracting == false,
-                let vc = ownerVC, vc.delegate?.floatingPanelShouldBeginDragging?(vc) == false {
+                let vc = ownerVC, vc.delegate?.floatingPanelShouldBeginDragging?(vc) == false
+            {
                 return
             }
 
@@ -518,9 +525,11 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                     // Workaround: Prevent stopping the surface view b/w anchors if the pan gesture
                     // doesn't pass through .changed state after an interruptible animator is interrupted.
                     let diff = translation - .leastNonzeroMagnitude
-                    layoutAdapter.updateInteractiveEdgeConstraint(diff: value(of: diff),
-                                                                  scrollingContent: true,
-                                                                  allowsRubberBanding: behaviorAdapter.allowsRubberBanding(for:))
+                    layoutAdapter.updateInteractiveEdgeConstraint(
+                        diff: value(of: diff),
+                        scrollingContent: true,
+                        allowsRubberBanding: behaviorAdapter.allowsRubberBanding(for:)
+                    )
                 }
                 panningEnd(with: translation, velocity: velocity)
             default:
@@ -573,7 +582,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
         guard
             state == layoutAdapter.mostExpandedState,  // When not top most(i.e. .full), don't scroll.
-            interactionInProgress == false,        // When interaction already in progress, don't scroll.
+            interactionInProgress == false,  // When interaction already in progress, don't scroll.
             0 == layoutAdapter.offsetFromMostExpandedAnchor
         else {
             return false
@@ -591,8 +600,8 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
         let scrollViewFrame = scrollView.convert(scrollView.bounds, to: surfaceView)
         guard
-            scrollViewFrame.contains(initialLocation), // When the initial point not in scrollView, don't scroll.
-            !surfaceView.grabberAreaContains(point)        // When point within grabber area, don't scroll.
+            scrollViewFrame.contains(initialLocation),  // When the initial point not in scrollView, don't scroll.
+            !surfaceView.grabberAreaContains(point)  // When point within grabber area, don't scroll.
         else {
             return false
         }
@@ -602,14 +611,14 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         // after a panel moves from half/tip to full.
         switch layoutAdapter.position {
         case .top, .left:
-            if  offset < 0.0 {
+            if offset < 0.0 {
                 return true
             }
             if velocity >= 0 {
                 return true
             }
         case .bottom, .right:
-            if  offset > 0.0 {
+            if offset > 0.0 {
                 return true
             }
             if velocity <= 0 {
@@ -649,15 +658,17 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         let diff = value(of: translation - initialTranslation)
         let next = pre + diff
 
-        layoutAdapter.updateInteractiveEdgeConstraint(diff: diff,
-                                                      scrollingContent: shouldScrollingContentInMoving(from: pre, to: next),
-                                                      allowsRubberBanding: behaviorAdapter.allowsRubberBanding(for:))
+        layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: diff,
+            scrollingContent: shouldScrollingContentInMoving(from: pre, to: next),
+            allowsRubberBanding: behaviorAdapter.allowsRubberBanding(for:)
+        )
 
         let cur = value(of: layoutAdapter.surfaceLocation)
 
         backdropView.alpha = getBackdropAlpha(at: cur, with: value(of: translation))
 
-        guard (pre != cur) else { return }
+        guard pre != cur else { return }
 
         if let vc = ownerVC {
             vc.delegate?.floatingPanelDidMove?(vc)
@@ -672,23 +683,19 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         if let scrollView = scrollView, scrollView.panGestureRecognizer.state == .changed {
             switch layoutAdapter.position {
             case .top:
-                if pre > .zero, pre < next,
-                    scrollView.contentSize.height > scrollView.bounds.height || scrollView.alwaysBounceVertical {
+                if pre > .zero, pre < next, scrollView.contentSize.height > scrollView.bounds.height || scrollView.alwaysBounceVertical {
                     return true
                 }
             case .left:
-                if pre > .zero, pre < next,
-                    scrollView.contentSize.width > scrollView.bounds.width || scrollView.alwaysBounceHorizontal {
+                if pre > .zero, pre < next, scrollView.contentSize.width > scrollView.bounds.width || scrollView.alwaysBounceHorizontal {
                     return true
                 }
             case .bottom:
-                if pre > .zero, pre > next,
-                    scrollView.contentSize.height > scrollView.bounds.height || scrollView.alwaysBounceVertical {
+                if pre > .zero, pre > next, scrollView.contentSize.height > scrollView.bounds.height || scrollView.alwaysBounceVertical {
                     return true
                 }
             case .right:
-                if pre > .zero, pre > next,
-                    scrollView.contentSize.width > scrollView.bounds.width || scrollView.alwaysBounceHorizontal {
+                if pre > .zero, pre > next, scrollView.contentSize.width > scrollView.bounds.width || scrollView.alwaysBounceHorizontal {
                     return true
                 }
             }
@@ -704,11 +711,11 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             return
         }
 
-        stopScrollDeceleration = (0 > layoutAdapter.offsetFromMostExpandedAnchor + (1.0 / surfaceView.fp_displayScale)) // Projecting the dragging to the scroll dragging or not
+        stopScrollDeceleration = (0 > layoutAdapter.offsetFromMostExpandedAnchor + (1.0 / surfaceView.fp_displayScale))  // Projecting the dragging to the scroll dragging or not
         if stopScrollDeceleration {
             DispatchQueue.main.async { [weak self] in
                 guard let self = self else { return }
-                
+
                 self.stopScrolling(at: self.initialScrollOffset)
             }
         }
@@ -723,9 +730,9 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             let distToHidden = CGFloat(abs(currentPos - layoutAdapter.position(for: .hidden)))
             switch layoutAdapter.position {
             case .top, .bottom:
-                removalVector = (distToHidden != 0) ? CGVector(dx: 0.0, dy: velocity.y/distToHidden) : .zero
+                removalVector = (distToHidden != 0) ? CGVector(dx: 0.0, dy: velocity.y / distToHidden) : .zero
             case .left, .right:
-                removalVector = (distToHidden != 0) ? CGVector(dx: velocity.x/distToHidden, dy: 0.0) : .zero
+                removalVector = (distToHidden != 0) ? CGVector(dx: velocity.x / distToHidden, dy: 0.0) : .zero
             }
             if shouldRemove(with: removalVector) {
                 ownerVC?.remove()
@@ -761,8 +768,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         startAttraction(to: targetPosition, with: velocity)
 
         // Workaround: Reset `self.scrollView.isScrollEnabled`
-        if let scrollView = scrollView, targetPosition != layoutAdapter.mostExpandedState,
-            let isScrollEnabled = isScrollEnabled {
+        if let scrollView = scrollView, targetPosition != layoutAdapter.mostExpandedState, let isScrollEnabled = isScrollEnabled {
             scrollView.isScrollEnabled = isScrollEnabled
         }
     }
@@ -788,7 +794,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     private func startInteraction(with translation: CGPoint, at location: CGPoint) {
-        /* Don't lock a scroll view to show a scroll indicator after hitting the top */
+        // Don't lock a scroll view to show a scroll indicator after hitting the top
         log.debug("startInteraction  -- translation = \(value(of: translation)), location = \(value(of: location))")
         guard interactionInProgress == false else { return }
 
@@ -887,21 +893,25 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             decelerationRate: behaviorAdapter.springDecelerationRate,
             responseTime: behaviorAdapter.springResponseTime,
             update: { [weak self] data in
-                guard let self = self,
-                      let ownerVC = self.ownerVC // Ensure the owner vc is existing for `layoutAdapter.surfaceLocation`
+                guard
+                    let self = self,
+                    let ownerVC = self.ownerVC  // Ensure the owner vc is existing for `layoutAdapter.surfaceLocation`
                 else { return }
                 animationConstraint.constant = data.value
                 let current = self.value(of: self.layoutAdapter.surfaceLocation)
                 let translation = data.value - initialData.value
                 self.backdropView.alpha = self.getBackdropAlpha(at: current, with: translation)
                 ownerVC.notifyDidMove()
-        },
+            },
             completion: { [weak self] in
-                guard let self = self,
-                      self.ownerVC != nil else { return }
+                guard
+                    let self = self,
+                    self.ownerVC != nil
+                else { return }
                 self.updateLayout(to: targetPosition)
                 completion()
-        })
+            }
+        )
         moveAnimator?.startAnimation()
         state = targetPosition
     }
@@ -920,11 +930,13 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
         stopScrollDeceleration = false
 
-        log.debug("""
+        log.debug(
+            """
             finishAnimation -- state = \(state) \
             surface location = \(layoutAdapter.surfaceLocation) \
             edge most position = \(layoutAdapter.surfaceLocation(for: layoutAdapter.mostExpandedState))
-            """)
+            """
+        )
         if finished, state == layoutAdapter.mostExpandedState, abs(layoutAdapter.offsetFromMostExpandedAnchor) <= 1.0 {
             unlockScrollView()
         }
@@ -954,7 +966,11 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
         let sortedPositions = layoutAdapter.sortedAnchorStatesByCoordinate
 
-        guard sortedPositions.count > 1 else {
+        guard
+            sortedPositions.count > 1,
+            let firstPosition = sortedPositions.first,
+            let lastPosition = sortedPositions.last
+        else {
             return state
         }
 
@@ -972,13 +988,13 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         var fromPos: FloatingPanelState
         var toPos: FloatingPanelState
 
-        let (lowerPos, upperPos) = (segment.lower ?? sortedPositions.first!, segment.upper ?? sortedPositions.last!)
+        let (lowerPos, upperPos) = (segment.lower ?? firstPosition, segment.upper ?? lastPosition)
         (fromPos, toPos) = forwardY ? (lowerPos, upperPos) : (upperPos, lowerPos)
 
         if behaviorAdapter.shouldProjectMomentum(to: toPos) == false {
             log.debug("targetPosition -- negate projection: distance = \(distance)")
             let segment = layoutAdapter.segment(at: currentY, forward: forwardY)
-            var (lowerPos, upperPos) = (segment.lower ?? sortedPositions.first!, segment.upper ?? sortedPositions.last!)
+            var (lowerPos, upperPos) = (segment.lower ?? firstPosition, segment.upper ?? lastPosition)
             // Equate the segment out of {top,bottom} most state to the {top,bottom} most segment
             if lowerPos == upperPos {
                 if forwardY {
@@ -1117,9 +1133,11 @@ public final class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
         }
         set {
             guard newValue is Core else {
-                let exception = NSException(name: .invalidArgumentException,
-                                            reason: "FloatingPanelController's built-in pan gesture recognizer must have its controller as its delegate. Use 'delegateProxy' property.",
-                                            userInfo: nil)
+                let exception = NSException(
+                    name: .invalidArgumentException,
+                    reason: "FloatingPanelController's built-in pan gesture recognizer must have its controller as its delegate. Use 'delegateProxy' property.",
+                    userInfo: nil
+                )
                 exception.raise()
                 return
             }
@@ -1132,7 +1150,7 @@ public final class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
     /// If an object adopting `UIGestureRecognizerDelegate` is set, the delegate methods are proxied to it.
     public weak var delegateProxy: UIGestureRecognizerDelegate? {
         didSet {
-            self.delegate = floatingPanel // Update the cached IMP
+            self.delegate = floatingPanel  // Update the cached IMP
         }
     }
 }
@@ -1148,13 +1166,13 @@ private class NumericSpringAnimator: NSObject {
     private class UnfairLock {
         var unfairLock = os_unfair_lock()
         func lock() {
-            os_unfair_lock_lock(&unfairLock);
+            os_unfair_lock_lock(&unfairLock)
         }
         func tryLock() -> Bool {
-            return os_unfair_lock_trylock(&unfairLock);
+            return os_unfair_lock_trylock(&unfairLock)
         }
         func unlock() {
-            os_unfair_lock_unlock(&unfairLock);
+            os_unfair_lock_unlock(&unfairLock)
         }
     }
 
@@ -1174,21 +1192,23 @@ private class NumericSpringAnimator: NSObject {
     private let update: ((_ data: Data) -> Void)
     private let completion: (() -> Void)
 
-    init(initialData: Data,
-         target: CGFloat,
-         displayScale: CGFloat,
-         decelerationRate: CGFloat,
-         responseTime: CGFloat,
-         update: @escaping ((_ data: Data) -> Void),
-         completion: @escaping (() -> Void)) {
+    init(
+        initialData: Data,
+        target: CGFloat,
+        displayScale: CGFloat,
+        decelerationRate: CGFloat,
+        responseTime: CGFloat,
+        update: @escaping ((_ data: Data) -> Void),
+        completion: @escaping (() -> Void)
+    ) {
 
         self.data = initialData
         self.target = target
         self.displayScale = displayScale
 
-        let frequency = 1 / responseTime // oscillation frequency
-        let duration: CGFloat = 0.001 // millisecond
-        self.zeta = abs(initialData.velocity) > 300 ? CoreGraphics.log(decelerationRate) / (-2.0 * .pi * frequency * duration)  : 1.0
+        let frequency = 1 / responseTime  // oscillation frequency
+        let duration: CGFloat = 0.001  // millisecond
+        self.zeta = abs(initialData.velocity) > 300 ? CoreGraphics.log(decelerationRate) / (-2.0 * .pi * frequency * duration) : 1.0
         self.omega = 2.0 * .pi * frequency
 
         self.update = update
@@ -1196,7 +1216,7 @@ private class NumericSpringAnimator: NSObject {
     }
 
     @discardableResult
-    func startAnimation() -> Bool{
+    func startAnimation() -> Bool {
         lock.lock()
         defer { lock.unlock() }
 
@@ -1232,29 +1252,28 @@ private class NumericSpringAnimator: NSObject {
         let pre = data.value
         var cur = pre
         var velocity = data.velocity
-        spring(x: &cur,
-               v: &velocity,
-               xt: target,
-               zeta: zeta,
-               omega: omega,
-               h: CGFloat(displayLink.targetTimestamp - displayLink.timestamp))
+        spring(
+            x: &cur,
+            v: &velocity,
+            xt: target,
+            zeta: zeta,
+            omega: omega,
+            h: CGFloat(displayLink.targetTimestamp - displayLink.timestamp)
+        )
         data = Data(value: cur, velocity: velocity)
         update(data)
-        if abs(target - data.value) <= (1 / displayScale),
-           abs(pre - data.value) / (1 / displayScale) <= 1 {
+        if abs(target - data.value) <= (1 / displayScale), abs(pre - data.value) / (1 / displayScale) <= 1 {
             stopAnimation(false)
         }
     }
 
-    /**
-     - Parameters:
-     - x: value
-     - v: velocity
-     - xt: target value
-     - zeta: damping ratio
-     - omega: angular frequency
-     - h: time step
-     */
+    /// - Parameters:
+    ///     - x: value
+    ///     - v: velocity
+    ///     - xt: target value
+    ///     - zeta: damping ratio
+    ///     - omega: angular frequency
+    ///     - h: time step
     private func spring(x: inout CGFloat, v: inout CGFloat, xt: CGFloat, zeta: CGFloat, omega: CGFloat, h: CGFloat) {
         let f = 1.0 + 2.0 * h * zeta * omega
         let h2 = pow(h, 2)

Sources/Extensions.swift

@@ -52,12 +52,14 @@ private class CustomLayoutGuide: LayoutGuideProvider {
     let rightAnchor: NSLayoutXAxisAnchor
     let widthAnchor: NSLayoutDimension
     let heightAnchor: NSLayoutDimension
-    init(topAnchor: NSLayoutYAxisAnchor,
-         leftAnchor: NSLayoutXAxisAnchor,
-         bottomAnchor: NSLayoutYAxisAnchor,
-         rightAnchor: NSLayoutXAxisAnchor,
-         widthAnchor: NSLayoutDimension,
-         heightAnchor: NSLayoutDimension) {
+    init(
+        topAnchor: NSLayoutYAxisAnchor,
+        leftAnchor: NSLayoutXAxisAnchor,
+        bottomAnchor: NSLayoutYAxisAnchor,
+        rightAnchor: NSLayoutXAxisAnchor,
+        widthAnchor: NSLayoutDimension,
+        heightAnchor: NSLayoutDimension
+    ) {
         self.topAnchor = topAnchor
         self.leftAnchor = leftAnchor
         self.bottomAnchor = bottomAnchor
@@ -72,23 +74,27 @@ extension UIViewController {
         if #available(iOS 11.0, *) {
             return view.safeAreaInsets
         } else {
-            return UIEdgeInsets(top: topLayoutGuide.length,
-                                left: 0.0,
-                                bottom: bottomLayoutGuide.length,
-                                right: 0.0)
+            return UIEdgeInsets(
+                top: topLayoutGuide.length,
+                left: 0.0,
+                bottom: bottomLayoutGuide.length,
+                right: 0.0
+            )
         }
     }
 
     var fp_safeAreaLayoutGuide: LayoutGuideProvider {
         if #available(iOS 11.0, *) {
-            return view!.safeAreaLayoutGuide
+            return view?.safeAreaLayoutGuide ?? view
         } else {
-            return CustomLayoutGuide(topAnchor: topLayoutGuide.bottomAnchor,
-                                     leftAnchor: view.leftAnchor,
-                                     bottomAnchor: bottomLayoutGuide.topAnchor,
-                                     rightAnchor: view.rightAnchor,
-                                     widthAnchor: view.widthAnchor,
-                                     heightAnchor: topLayoutGuide.bottomAnchor.anchorWithOffset(to: bottomLayoutGuide.topAnchor))
+            return CustomLayoutGuide(
+                topAnchor: topLayoutGuide.bottomAnchor,
+                leftAnchor: view.leftAnchor,
+                bottomAnchor: bottomLayoutGuide.topAnchor,
+                rightAnchor: view.rightAnchor,
+                widthAnchor: view.widthAnchor,
+                heightAnchor: topLayoutGuide.bottomAnchor.anchorWithOffset(to: bottomLayoutGuide.topAnchor)
+            )
         }
     }
 }
@@ -133,9 +139,14 @@ extension UIView {
     }
 
     static func performWithLinear(startTime: Double = 0.0, relativeDuration: Double = 1.0, _ animations: @escaping (() -> Void)) {
-        UIView.animateKeyframes(withDuration: 0.0, delay: 0.0, options: [.calculationModeCubic], animations: {
-            UIView.addKeyframe(withRelativeStartTime: startTime, relativeDuration: relativeDuration, animations: animations)
-        }, completion: nil)
+        UIView.animateKeyframes(
+            withDuration: 0.0,
+            delay: 0.0,
+            options: [.calculationModeCubic],
+            animations: {
+                UIView.addKeyframe(withRelativeStartTime: startTime, relativeDuration: relativeDuration, animations: animations)
+            },
+            completion: nil)
     }
 }
 
@@ -167,8 +178,10 @@ extension UIScrollView {
         }
     }
     var fp_contentOffsetMax: CGPoint {
-        return CGPoint(x: max((contentSize.width + fp_contentInset.right) - bounds.width, 0.0),
-                       y: max((contentSize.height + fp_contentInset.bottom) - bounds.height, 0.0))
+        return CGPoint(
+            x: max((contentSize.width + fp_contentInset.right) - bounds.width, 0.0),
+            y: max((contentSize.height + fp_contentInset.bottom) - bounds.height, 0.0)
+        )
     }
 }
 
@@ -208,7 +221,7 @@ extension UIEdgeInsets {
 
 extension UIBezierPath {
     static func path(roundedRect rect: CGRect, appearance: SurfaceAppearance) -> UIBezierPath {
-        let cornerRadius = appearance.cornerRadius;
+        let cornerRadius = appearance.cornerRadius
         if #available(iOS 13.0, *) {
             if appearance.cornerCurve == .circular {
                 let path = UIBezierPath()
@@ -218,45 +231,61 @@ extension UIBezierPath {
 
                 path.addLine(to: CGPoint(x: rect.maxX - cornerRadius, y: rect.minY))
                 if cornerRadius > 0 {
-                    path .addArc(withCenter: CGPoint(x: rect.maxX - cornerRadius,
-                                                     y: rect.minY + cornerRadius),
-                                 radius: cornerRadius,
-                                 startAngle: -0.5 * .pi,
-                                 endAngle: 0,
-                                 clockwise: true)
+                    path.addArc(
+                        withCenter: CGPoint(
+                            x: rect.maxX - cornerRadius,
+                            y: rect.minY + cornerRadius
+                        ),
+                        radius: cornerRadius,
+                        startAngle: -0.5 * .pi,
+                        endAngle: 0,
+                        clockwise: true
+                    )
                 }
 
                 path.addLine(to: CGPoint(x: rect.maxX, y: rect.maxY - cornerRadius))
 
                 if cornerRadius > 0 {
-                    path.addArc(withCenter: CGPoint(x: rect.maxX - cornerRadius,
-                                                    y: rect.maxY - cornerRadius),
-                                radius: cornerRadius,
-                                startAngle: 0,
-                                endAngle: .pi * 0.5,
-                                clockwise: true)
+                    path.addArc(
+                        withCenter: CGPoint(
+                            x: rect.maxX - cornerRadius,
+                            y: rect.maxY - cornerRadius
+                        ),
+                        radius: cornerRadius,
+                        startAngle: 0,
+                        endAngle: .pi * 0.5,
+                        clockwise: true
+                    )
                 }
 
                 path.addLine(to: CGPoint(x: rect.minX + cornerRadius, y: rect.maxY))
 
                 if cornerRadius > 0 {
-                    path.addArc(withCenter: CGPoint(x: rect.minX + cornerRadius,
-                                                    y: rect.maxY - cornerRadius),
-                                radius: cornerRadius,
-                                startAngle: .pi * 0.5,
-                                endAngle: .pi,
-                                clockwise: true)
+                    path.addArc(
+                        withCenter: CGPoint(
+                            x: rect.minX + cornerRadius,
+                            y: rect.maxY - cornerRadius
+                        ),
+                        radius: cornerRadius,
+                        startAngle: .pi * 0.5,
+                        endAngle: .pi,
+                        clockwise: true
+                    )
                 }
 
                 path.addLine(to: CGPoint(x: rect.minX, y: rect.minY + cornerRadius))
 
                 if cornerRadius > 0 {
-                    path.addArc(withCenter: CGPoint(x: rect.minX + cornerRadius,
-                                                    y: rect.minY + cornerRadius),
-                                radius: cornerRadius,
-                                startAngle: .pi,
-                                endAngle: .pi * 1.5,
-                                clockwise: true)
+                    path.addArc(
+                        withCenter: CGPoint(
+                            x: rect.minX + cornerRadius,
+                            y: rect.minY + cornerRadius
+                        ),
+                        radius: cornerRadius,
+                        startAngle: .pi,
+                        endAngle: .pi * 1.5,
+                        clockwise: true
+                    )
                 }
 
                 path.addLine(to: start)
@@ -266,9 +295,13 @@ extension UIBezierPath {
                 return path
             }
         }
-        return UIBezierPath(roundedRect: rect,
-                            byRoundingCorners: [.allCorners],
-                            cornerRadii: CGSize(width: cornerRadius,
-                                                height: cornerRadius))
+        return UIBezierPath(
+            roundedRect: rect,
+            byRoundingCorners: [.allCorners],
+            cornerRadii: CGSize(
+                width: cornerRadius,
+                height: cornerRadius
+            )
+        )
     }
 }

Sources/Layout.swift

@@ -30,7 +30,7 @@ open class FloatingPanelBottomLayout: NSObject, FloatingPanelLayout {
         return .half
     }
 
-    open var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
+    open var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
         return [
             .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .top, referenceGuide: .safeArea),
             .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
@@ -153,36 +153,42 @@ class LayoutAdapter {
     var adjustedContentInsets: UIEdgeInsets {
         switch position {
         case .top:
-            return UIEdgeInsets(top: safeAreaInsets.top,
-                                left: 0.0,
-                                bottom: 0.0,
-                                right: 0.0)
+            return UIEdgeInsets(
+                top: safeAreaInsets.top,
+                left: 0.0,
+                bottom: 0.0,
+                right: 0.0
+            )
         case .left:
-            return UIEdgeInsets(top: 0.0,
-                                left: safeAreaInsets.left,
-                                bottom: 0.0,
-                                right: 0.0)
+            return UIEdgeInsets(
+                top: 0.0,
+                left: safeAreaInsets.left,
+                bottom: 0.0,
+                right: 0.0
+            )
         case .bottom:
-            return UIEdgeInsets(top: 0.0,
-                                left: 0.0,
-                                bottom: safeAreaInsets.bottom,
-                                right: 0.0)
+            return UIEdgeInsets(
+                top: 0.0,
+                left: 0.0,
+                bottom: safeAreaInsets.bottom,
+                right: 0.0
+            )
         case .right:
-            return UIEdgeInsets(top: 0.0,
-                                left: 0.0,
-                                bottom: 0.0,
-                                right: safeAreaInsets.right)
+            return UIEdgeInsets(
+                top: 0.0,
+                left: 0.0,
+                bottom: 0.0,
+                right: safeAreaInsets.right
+            )
         }
     }
 
-    /*
-    Returns a constraint based value in the interaction and animation.
-
-    So that it doesn't need to call `surfaceView.layoutIfNeeded()`
-    after every interaction and animation update. It has an effect on
-    the smooth interaction because the content view doesn't need to update
-    its layout frequently.
-    */
+    /// Returns a constraint based value in the interaction and animation.
+    ///
+    /// So that it doesn't need to call `surfaceView.layoutIfNeeded()`
+    /// after every interaction and animation update. It has an effect on
+    /// the smooth interaction because the content view doesn't need to update
+    /// its layout frequently.
     var surfaceLocation: CGPoint {
         get {
             var pos: CGFloat
@@ -433,10 +439,10 @@ class LayoutAdapter {
         }
         let backdropConstraints = [
             backdropView.topAnchor.constraint(equalTo: vc.view.topAnchor, constant: 0.0),
-            backdropView.leftAnchor.constraint(equalTo: vc.view.leftAnchor,constant: 0.0),
+            backdropView.leftAnchor.constraint(equalTo: vc.view.leftAnchor, constant: 0.0),
             backdropView.rightAnchor.constraint(equalTo: vc.view.rightAnchor, constant: 0.0),
             backdropView.bottomAnchor.constraint(equalTo: vc.view.bottomAnchor, constant: 0.0),
-            ]
+        ]
 
         fixedConstraints = surfaceConstraints + backdropConstraints
 
@@ -471,7 +477,10 @@ class LayoutAdapter {
         for state in layout.anchors.keys {
             stateConstraints[state] = layout.anchors[state]?
                 .layoutConstraints(vc, for: position)
-                .map{ $0.identifier = "FloatingPanel-\(state)-constraint"; return $0 }
+                .map {
+                    $0.identifier = "FloatingPanel-\(state)-constraint"
+                    return $0
+                }
         }
         let hiddenAnchor = layout.anchors[.hidden] ?? self.hiddenAnchor
         offConstraints = hiddenAnchor.layoutConstraints(vc, for: position)
@@ -549,8 +558,10 @@ class LayoutAdapter {
         case .top:
             switch referenceEdge(of: anchor) {
             case .top:
-                animationConstraint = surfaceView.bottomAnchor.constraint(equalTo: layoutGuideProvider.topAnchor,
-                                                                          constant: currentY)
+                animationConstraint = surfaceView.bottomAnchor.constraint(
+                    equalTo: layoutGuideProvider.topAnchor,
+                    constant: currentY
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant -= safeAreaInsets.top
                     targetY -= safeAreaInsets.top
@@ -558,8 +569,10 @@ class LayoutAdapter {
             case .bottom:
                 let baseHeight = vc.view.bounds.height
                 targetY = -(baseHeight - targetY)
-                animationConstraint = surfaceView.bottomAnchor.constraint(equalTo: layoutGuideProvider.bottomAnchor,
-                                                                          constant: -(baseHeight - currentY))
+                animationConstraint = surfaceView.bottomAnchor.constraint(
+                    equalTo: layoutGuideProvider.bottomAnchor,
+                    constant: -(baseHeight - currentY)
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant += safeAreaInsets.bottom
                     targetY += safeAreaInsets.bottom
@@ -571,16 +584,20 @@ class LayoutAdapter {
         case .left:
             switch referenceEdge(of: anchor) {
             case .left:
-                animationConstraint = surfaceView.rightAnchor.constraint(equalTo: layoutGuideProvider.leftAnchor,
-                                                                          constant: currentY)
+                animationConstraint = surfaceView.rightAnchor.constraint(
+                    equalTo: layoutGuideProvider.leftAnchor,
+                    constant: currentY
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant -= safeAreaInsets.right
                     targetY -= safeAreaInsets.right
                 }
             case .right:
                 targetY = -(baseHeight - targetY)
-                animationConstraint = surfaceView.rightAnchor.constraint(equalTo: layoutGuideProvider.rightAnchor,
-                                                                          constant: -(baseHeight - currentY))
+                animationConstraint = surfaceView.rightAnchor.constraint(
+                    equalTo: layoutGuideProvider.rightAnchor,
+                    constant: -(baseHeight - currentY)
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant += safeAreaInsets.left
                     targetY += safeAreaInsets.left
@@ -591,16 +608,20 @@ class LayoutAdapter {
         case .bottom:
             switch referenceEdge(of: anchor) {
             case .top:
-                animationConstraint = surfaceView.topAnchor.constraint(equalTo: layoutGuideProvider.topAnchor,
-                                                                       constant: currentY)
+                animationConstraint = surfaceView.topAnchor.constraint(
+                    equalTo: layoutGuideProvider.topAnchor,
+                    constant: currentY
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant -= safeAreaInsets.top
                     targetY -= safeAreaInsets.top
                 }
             case .bottom:
                 targetY = -(baseHeight - targetY)
-                animationConstraint = surfaceView.topAnchor.constraint(equalTo: layoutGuideProvider.bottomAnchor,
-                                                                       constant: -(baseHeight - currentY))
+                animationConstraint = surfaceView.topAnchor.constraint(
+                    equalTo: layoutGuideProvider.bottomAnchor,
+                    constant: -(baseHeight - currentY)
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant += safeAreaInsets.bottom
                     targetY += safeAreaInsets.bottom
@@ -612,16 +633,20 @@ class LayoutAdapter {
         case .right:
             switch referenceEdge(of: anchor) {
             case .left:
-                animationConstraint = surfaceView.leftAnchor.constraint(equalTo: layoutGuideProvider.leftAnchor,
-                                                                         constant: currentY)
+                animationConstraint = surfaceView.leftAnchor.constraint(
+                    equalTo: layoutGuideProvider.leftAnchor,
+                    constant: currentY
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant -= safeAreaInsets.left
                     targetY -= safeAreaInsets.left
                 }
             case .right:
                 targetY = -(baseHeight - targetY)
-                animationConstraint = surfaceView.leftAnchor.constraint(equalTo: layoutGuideProvider.rightAnchor,
-                                                                         constant: -(baseHeight - currentY))
+                animationConstraint = surfaceView.leftAnchor.constraint(
+                    equalTo: layoutGuideProvider.rightAnchor,
+                    constant: -(baseHeight - currentY)
+                )
                 if anchor.referenceGuide == .safeArea {
                     animationConstraint.constant += safeAreaInsets.right
                     targetY += safeAreaInsets.right
@@ -647,7 +672,7 @@ class LayoutAdapter {
     // The method is separated from prepareLayout(to:) for the rotation support
     // It must be called in FloatingPanelController.traitCollectionDidChange(_:)
     func updateStaticConstraint() {
-        NSLayoutConstraint.deactivate([staticConstraint, contentBoundingConstraint].compactMap{ $0 })
+        NSLayoutConstraint.deactivate([staticConstraint, contentBoundingConstraint].compactMap { $0 })
         staticConstraint = nil
         contentBoundingConstraint = nil
 
@@ -656,7 +681,10 @@ class LayoutAdapter {
             return
         }
 
-        let anchor = layout.anchors[self.mostExpandedState]!
+        guard let anchor = layout.anchors[mostExpandedState] else {
+            return
+        }
+
         let surfaceAnchor = position.mainDimensionAnchor(surfaceView)
         switch anchor {
         case let anchor as FloatingPanelIntrinsicLayoutAnchor:
@@ -675,11 +703,15 @@ class LayoutAdapter {
             let baseAnchor = position.mainDimensionAnchor(anchor.contentLayoutGuide)
             if let boundingLayoutGuide = anchor.contentBoundingGuide.layoutGuide(vc) {
                 if anchor.isAbsolute {
-                    contentBoundingConstraint = baseAnchor.constraint(lessThanOrEqualTo: position.mainDimensionAnchor(boundingLayoutGuide),
-                                                               constant: anchor.offset)
+                    contentBoundingConstraint = baseAnchor.constraint(
+                        lessThanOrEqualTo: position.mainDimensionAnchor(boundingLayoutGuide),
+                        constant: anchor.offset
+                    )
                 } else {
-                    contentBoundingConstraint = baseAnchor.constraint(lessThanOrEqualTo: position.mainDimensionAnchor(boundingLayoutGuide),
-                                                               multiplier: anchor.offset)
+                    contentBoundingConstraint = baseAnchor.constraint(
+                        lessThanOrEqualTo: position.mainDimensionAnchor(boundingLayoutGuide),
+                        multiplier: anchor.offset
+                    )
                 }
                 staticConstraint = surfaceAnchor.constraint(lessThanOrEqualTo: baseAnchor, constant: constant)
             } else {
@@ -691,8 +723,10 @@ class LayoutAdapter {
                 staticConstraint = surfaceAnchor.constraint(equalToConstant: position(for: self.mostCoordinateState))
             case .bottom, .right:
                 let rootViewAnchor = position.mainDimensionAnchor(vc.view)
-                staticConstraint = rootViewAnchor.constraint(equalTo: surfaceAnchor,
-                                                             constant: position(for: self.leastCoordinateState))
+                staticConstraint = rootViewAnchor.constraint(
+                    equalTo: surfaceAnchor,
+                    constant: position(for: self.leastCoordinateState)
+                )
             }
         }
 
@@ -703,7 +737,7 @@ class LayoutAdapter {
             staticConstraint?.identifier = "FloatingPanel-static-width"
         }
 
-        NSLayoutConstraint.activate([staticConstraint, contentBoundingConstraint].compactMap{ $0 })
+        NSLayoutConstraint.activate([staticConstraint, contentBoundingConstraint].compactMap { $0 })
 
         surfaceView.containerOverflow = position.mainDimension(vc.view.bounds.size)
     }
@@ -806,9 +840,12 @@ class LayoutAdapter {
     fileprivate func checkLayout() {
         // Verify layout configurations
         assert(anchorStates.count > 0)
-        assert(validStates.contains(layout.initialState),
-               "Does not include an initial state (\(layout.initialState)) in (\(validStates))")
-        /* This assertion does not work in a device rotating
+        assert(
+            validStates.contains(layout.initialState),
+            "Does not include an initial state (\(layout.initialState)) in (\(validStates))"
+        )
+        /**
+         // This assertion does not work in a device rotating
          let statePosOrder = activeStates.sorted(by: { position(for: $0) < position(for: $1) })
          assert(sortedDirectionalStates == statePosOrder,
                "Check your layout anchors because the state order(\(statePosOrder)) must be (\(sortedDirectionalStates))).")

Sources/LayoutAnchoring.swift

@@ -3,13 +3,15 @@
 import UIKit
 
 /// An interface for implementing custom layout anchor objects.
-@objc public protocol FloatingPanelLayoutAnchoring {
+@objc
+public protocol FloatingPanelLayoutAnchoring {
     var referenceGuide: FloatingPanelLayoutReferenceGuide { get }
     func layoutConstraints(_ fpc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint]
 }
 
 /// An object that defines how to settles a panel with insets from an edge of a reference rectangle.
-@objc final public class FloatingPanelLayoutAnchor: NSObject, FloatingPanelLayoutAnchoring /*, NSCopying */ {
+@objc
+public final class FloatingPanelLayoutAnchor: NSObject, FloatingPanelLayoutAnchoring {
 
     /// Returns a layout anchor with the specified inset by an absolute value, edge and reference guide for a panel.
     ///
@@ -50,8 +52,8 @@ import UIKit
     @objc let referenceEdge: FloatingPanelReferenceEdge
 }
 
-public extension FloatingPanelLayoutAnchor {
-    func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
+extension FloatingPanelLayoutAnchor {
+    public func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
         let layoutGuide = referenceGuide.layoutGuide(vc: vc)
         switch position {
         case .top:
@@ -72,7 +74,7 @@ public extension FloatingPanelLayoutAnchor {
                 return [edgeAnchor.constraint(equalTo: layoutGuide.topAnchor, constant: inset)]
             }
             let offsetAnchor = layoutGuide.topAnchor.anchorWithOffset(to: edgeAnchor)
-            return [offsetAnchor.constraint(equalTo:layoutGuide.heightAnchor, multiplier: inset)]
+            return [offsetAnchor.constraint(equalTo: layoutGuide.heightAnchor, multiplier: inset)]
         case .bottom:
             if isAbsolute {
                 return [layoutGuide.bottomAnchor.constraint(equalTo: edgeAnchor, constant: inset)]
@@ -105,7 +107,8 @@ public extension FloatingPanelLayoutAnchor {
 }
 
 /// An object that defines how to settles a panel with the intrinsic size for a content.
-@objc final public class FloatingPanelIntrinsicLayoutAnchor: NSObject, FloatingPanelLayoutAnchoring /*, NSCopying */ {
+@objc
+public final class FloatingPanelIntrinsicLayoutAnchor: NSObject, FloatingPanelLayoutAnchoring {
 
     /// Returns a layout anchor with the specified offset by an absolute value and reference guide for a panel.
     ///
@@ -141,8 +144,8 @@ public extension FloatingPanelLayoutAnchor {
     @objc public let referenceGuide: FloatingPanelLayoutReferenceGuide
 }
 
-public extension FloatingPanelIntrinsicLayoutAnchor {
-    func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
+extension FloatingPanelIntrinsicLayoutAnchor {
+    public func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
         let surfaceIntrinsicLength = position.mainDimension(vc.surfaceView.intrinsicContentSize)
         let constant = isAbsolute ? surfaceIntrinsicLength - offset : surfaceIntrinsicLength * (1 - offset)
         let layoutGuide = referenceGuide.layoutGuide(vc: vc)
@@ -160,7 +163,8 @@ public extension FloatingPanelIntrinsicLayoutAnchor {
 }
 
 /// An object that defines how to settles a panel with a layout guide of a content view.
-@objc final public class FloatingPanelAdaptiveLayoutAnchor: NSObject, FloatingPanelLayoutAnchoring /*, NSCopying */ {
+@objc
+public final class FloatingPanelAdaptiveLayoutAnchor: NSObject, FloatingPanelLayoutAnchoring {
 
     /// Returns a layout anchor with the specified offset by an absolute value to display a panel with its intrinsic content size.
     ///
@@ -222,8 +226,8 @@ public extension FloatingPanelIntrinsicLayoutAnchor {
     @objc public let contentBoundingGuide: FloatingPanelLayoutContentBoundingGuide
 }
 
-public extension FloatingPanelAdaptiveLayoutAnchor {
-    func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
+extension FloatingPanelAdaptiveLayoutAnchor {
+    public func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
         var constraints = [NSLayoutConstraint]()
 
         let layoutGuide = referenceGuide.layoutGuide(vc: vc)

Sources/Logger.swift

@@ -80,21 +80,21 @@ struct Logger {
         }
     }
 
-    func debug(_ log: Any, _ arguments: Any..., tag: String = "", function: String = #function, file: String  = #file, line: UInt = #line) {
+    func debug(_ log: Any, _ arguments: Any..., tag: String = "", function: String = #function, file: String = #file, line: UInt = #line) {
         #if __FP_LOG
         self.log(.debug, log, arguments, tag: tag, function: getPrettyFunction(function, file), line: line)
         #endif
     }
 
-    func info(_ log: Any, _ arguments: Any..., tag: String = "",  function: String = #function, file: String  = #file, line: UInt = #line) {
+    func info(_ log: Any, _ arguments: Any..., tag: String = "", function: String = #function, file: String = #file, line: UInt = #line) {
         self.log(.info, log, arguments, tag: tag, function: getPrettyFunction(function, file), line: line)
     }
 
-    func warning(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
+    func warning(_ log: Any, _ arguments: Any..., function: String = #function, file: String = #file, line: UInt = #line) {
         self.log(.warning, log, arguments, tag: "", function: getPrettyFunction(function, file), line: line)
     }
 
-    func error(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
+    func error(_ log: Any, _ arguments: Any..., function: String = #function, file: String = #file, line: UInt = #line) {
         self.log(.error, log, arguments, tag: "", function: getPrettyFunction(function, file), line: line)
     }
 }

Sources/SurfaceView.swift

@@ -81,9 +81,11 @@ public class SurfaceView: UIView {
     public let grabberHandle = GrabberView()
 
     /// Offset of the grabber handle from the interactive edge.
-    public var grabberHandlePadding: CGFloat = 6.0 { didSet {
-        setNeedsUpdateConstraints()
-    } }
+    public var grabberHandlePadding: CGFloat = 6.0 {
+        didSet {
+            setNeedsUpdateConstraints()
+        }
+    }
 
     /// The offset from the move edge to prevent the content scroll
     public var grabberAreaOffset: CGFloat = 36.0
@@ -91,9 +93,11 @@ public class SurfaceView: UIView {
     /// The grabber handle size
     ///
     /// On left/right positioned panel the width dimension is used as the height of ``grabberHandle``, and vice versa.
-    public var grabberHandleSize: CGSize = CGSize(width: 36.0, height: 5.0) { didSet {
-        setNeedsUpdateConstraints()
-    } }
+    public var grabberHandleSize: CGSize = CGSize(width: 36.0, height: 5.0) {
+        didSet {
+            setNeedsUpdateConstraints()
+        }
+    }
 
     /// The content view to be assigned a view of the content view controller of `FloatingPanelController`
     public weak var contentView: UIView?
@@ -108,19 +112,26 @@ public class SurfaceView: UIView {
 
     public override var backgroundColor: UIColor? {
         get { return appearance.backgroundColor }
-        set { appearance.backgroundColor = newValue; setNeedsLayout() }
+        set {
+            appearance.backgroundColor = newValue
+            setNeedsLayout()
+        }
     }
 
     /// The appearance settings for a surface view.
-    public var appearance = SurfaceAppearance() { didSet {
-        shadowLayers = appearance.shadows.map { _ in CAShapeLayer() }
-        setNeedsLayout()
-    }}
+    public var appearance = SurfaceAppearance() {
+        didSet {
+            shadowLayers = appearance.shadows.map { _ in CAShapeLayer() }
+            setNeedsLayout()
+        }
+    }
 
     /// The margins to use when laying out the container view wrapping content.
-    public var containerMargins: UIEdgeInsets = .zero { didSet {
-        setNeedsUpdateConstraints()
-    } }
+    public var containerMargins: UIEdgeInsets = .zero {
+        didSet {
+            setNeedsUpdateConstraints()
+        }
+    }
 
     /// The view that displays an actual surface shape.
     ///
@@ -130,7 +141,7 @@ public class SurfaceView: UIView {
     /// content view.
     public let containerView: UIView = UIView()
 
-    var containerOverflow: CGFloat = 0.0 { // Must not call setNeedsLayout()
+    var containerOverflow: CGFloat = 0.0 {  // Must not call setNeedsLayout()
         didSet {
             // Calling setNeedsUpdateConstraints() is necessary to fix a layout break
             // when the contentMode is changed after laying out a panel, for instance,
@@ -142,10 +153,12 @@ public class SurfaceView: UIView {
     var position: FloatingPanelPosition = .bottom {
         didSet {
             guard position != oldValue else { return }
-            NSLayoutConstraint.deactivate([grabberHandleEdgePaddingConstraint,
-                                           grabberHandleCenterConstraint,
-                                           grabberHandleWidthConstraint,
-                                           grabberHandleHeightConstraint])
+            NSLayoutConstraint.deactivate([
+                grabberHandleEdgePaddingConstraint,
+                grabberHandleCenterConstraint,
+                grabberHandleWidthConstraint,
+                grabberHandleHeightConstraint,
+            ])
             switch position {
             case .top:
                 grabberHandleEdgePaddingConstraint = grabberHandle.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -grabberHandlePadding)
@@ -168,10 +181,12 @@ public class SurfaceView: UIView {
                 grabberHandleWidthConstraint = grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandleSize.height)
                 grabberHandleHeightConstraint = grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandleSize.width)
             }
-            NSLayoutConstraint.activate([grabberHandleEdgePaddingConstraint,
-                                         grabberHandleCenterConstraint,
-                                         grabberHandleWidthConstraint,
-                                         grabberHandleHeightConstraint])
+            NSLayoutConstraint.activate([
+                grabberHandleEdgePaddingConstraint,
+                grabberHandleCenterConstraint,
+                grabberHandleWidthConstraint,
+                grabberHandleHeightConstraint,
+            ])
             setNeedsUpdateConstraints()
         }
     }
@@ -179,17 +194,25 @@ public class SurfaceView: UIView {
     var grabberAreaFrame: CGRect {
         switch position {
         case .top:
-            return CGRect(origin: .init(x: bounds.minX, y: bounds.maxY - grabberAreaOffset),
-                          size: .init(width: bounds.width, height: grabberAreaOffset))
+            return CGRect(
+                origin: .init(x: bounds.minX, y: bounds.maxY - grabberAreaOffset),
+                size: .init(width: bounds.width, height: grabberAreaOffset)
+            )
         case .left:
-            return CGRect(origin: .init(x: bounds.maxX - grabberAreaOffset, y: bounds.minY),
-                          size: .init(width: grabberAreaOffset, height: bounds.height))
+            return CGRect(
+                origin: .init(x: bounds.maxX - grabberAreaOffset, y: bounds.minY),
+                size: .init(width: grabberAreaOffset, height: bounds.height)
+            )
         case .bottom:
-            return CGRect(origin: CGPoint(x: bounds.minX, y: bounds.minY),
-                          size: CGSize(width: bounds.width, height: grabberAreaOffset))
+            return CGRect(
+                origin: CGPoint(x: bounds.minX, y: bounds.minY),
+                size: CGSize(width: bounds.width, height: grabberAreaOffset)
+            )
         case .right:
-            return CGRect(origin: .init(x: bounds.minX, y: bounds.minY),
-                          size: .init(width: grabberAreaOffset, height: bounds.height))
+            return CGRect(
+                origin: .init(x: bounds.minX, y: bounds.minY),
+                size: .init(width: grabberAreaOffset, height: bounds.height)
+            )
         }
     }
 
@@ -209,7 +232,7 @@ public class SurfaceView: UIView {
 
     private lazy var grabberHandleWidthConstraint = grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandleSize.width)
     private lazy var grabberHandleHeightConstraint = grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandleSize.height)
-    private lazy var grabberHandleCenterConstraint =  grabberHandle.centerXAnchor.constraint(equalTo: centerXAnchor)
+    private lazy var grabberHandleCenterConstraint = grabberHandle.centerXAnchor.constraint(equalTo: centerXAnchor)
     private lazy var grabberHandleEdgePaddingConstraint = grabberHandle.topAnchor.constraint(equalTo: topAnchor, constant: grabberHandlePadding)
 
     private var shadowLayers: [CALayer] = [] {
@@ -243,27 +266,31 @@ public class SurfaceView: UIView {
 
         addSubview(containerView)
         containerView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            containerViewTopConstraint,
-            containerViewLeftConstraint,
-            containerViewBottomConstraint,
-            containerViewRightConstraint,
-        ].map {
-            $0.identifier = "FloatingPanel-surface-container"
-            return $0;
-        })
+        NSLayoutConstraint.activate(
+            [
+                containerViewTopConstraint,
+                containerViewLeftConstraint,
+                containerViewBottomConstraint,
+                containerViewRightConstraint,
+            ].map {
+                $0.identifier = "FloatingPanel-surface-container"
+                return $0
+            }
+        )
 
         addSubview(grabberHandle)
         grabberHandle.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            grabberHandleEdgePaddingConstraint,
-            grabberHandleCenterConstraint,
-            grabberHandleWidthConstraint,
-            grabberHandleHeightConstraint,
-        ].map {
-            $0.identifier = "FloatingPanel-surface-grabber"
-            return $0;
-        })
+        NSLayoutConstraint.activate(
+            [
+                grabberHandleEdgePaddingConstraint,
+                grabberHandleCenterConstraint,
+                grabberHandleWidthConstraint,
+                grabberHandleHeightConstraint,
+            ].map {
+                $0.identifier = "FloatingPanel-surface-grabber"
+                return $0
+            }
+        )
 
         shadowLayers = appearance.shadows.map { _ in CALayer() }
     }
@@ -311,7 +338,7 @@ public class SurfaceView: UIView {
         case .left, .right:
             grabberHandleWidthConstraint.constant = grabberHandleSize.height
             grabberHandleHeightConstraint.constant = grabberHandleSize.width
-       }
+        }
 
         super.updateConstraints()
     }
@@ -332,8 +359,10 @@ public class SurfaceView: UIView {
     public override var intrinsicContentSize: CGSize {
         let fittingSize = UIView.layoutFittingCompressedSize
         let contentSize = contentView?.systemLayoutSizeFitting(fittingSize) ?? .zero
-        return CGSize(width: containerMargins.horizontalInset + contentPadding.horizontalInset + contentSize.width,
-                      height: containerMargins.verticalInset + contentPadding.verticalInset + contentSize.height)
+        return CGSize(
+            width: containerMargins.horizontalInset + contentPadding.horizontalInset + contentSize.width,
+            height: containerMargins.verticalInset + contentPadding.verticalInset + contentSize.height
+        )
     }
 
     private func updateShadow() {
@@ -348,8 +377,10 @@ public class SurfaceView: UIView {
 
             let spread = shadow.spread
             let shadowRect = containerView.frame.insetBy(dx: -spread, dy: -spread)
-            let shadowPath = UIBezierPath.path(roundedRect: shadowRect,
-                                               appearance: appearance)
+            let shadowPath = UIBezierPath.path(
+                roundedRect: shadowRect,
+                appearance: appearance
+            )
             shadowLayer.shadowPath = shadowPath.cgPath
             shadowLayer.shadowColor = shadow.color.cgColor
             shadowLayer.shadowOffset = shadow.offset
@@ -358,11 +389,19 @@ public class SurfaceView: UIView {
             shadowLayer.shadowOpacity = shadow.opacity
 
             let mask = CAShapeLayer()
-            let path = UIBezierPath.path(roundedRect: containerView.frame,
-                                         appearance: appearance)
+            let path = UIBezierPath.path(
+                roundedRect: containerView.frame,
+                appearance: appearance
+            )
             let size = window?.bounds.size ?? CGSize(width: 1000.0, height: 1000.0)
-            path.append(UIBezierPath(rect: layer.bounds.insetBy(dx: -size.width,
-                                                                dy: -size.height)))
+            path.append(
+                UIBezierPath(
+                    rect: layer.bounds.insetBy(
+                        dx: -size.width,
+                        dy: -size.height
+                    )
+                )
+            )
             mask.fillRule = .evenOdd
             mask.path = path.cgPath
             if #available(iOS 13.0, *) {
@@ -383,8 +422,10 @@ public class SurfaceView: UIView {
         containerView.layer.masksToBounds = true
         if position.inset(containerMargins) != 0 {
             if #available(iOS 11, *) {
-                containerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner,
-                                                     .layerMinXMaxYCorner, .layerMaxXMaxYCorner]
+                containerView.layer.maskedCorners = [
+                    .layerMinXMinYCorner, .layerMaxXMinYCorner,
+                    .layerMinXMaxYCorner, .layerMaxXMaxYCorner,
+                ]
             }
             return
         }
@@ -416,28 +457,33 @@ public class SurfaceView: UIView {
     func set(contentView: UIView, mode: FloatingPanelController.ContentMode) {
         containerView.addSubview(contentView)
         self.contentView = contentView
-        /* contentView.frame = bounds */ // MUST NOT: Because the top safe area inset of a content VC will be incorrect.
+        /**
+         // MUST NOT: Because the top safe area inset of a content VC will be incorrect.
+         contentView.frame = bounds
+         */
         contentView.translatesAutoresizingMaskIntoConstraints = false
         let topConstraint = contentView.topAnchor.constraint(equalTo: topAnchor, constant: containerMargins.top + contentPadding.top)
         let leftConstraint = contentView.leftAnchor.constraint(equalTo: leftAnchor, constant: containerMargins.left + contentPadding.left)
         let rightConstraint = rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: containerMargins.right + contentPadding.right)
         let bottomConstraint = bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: containerMargins.bottom + contentPadding.bottom)
-        NSLayoutConstraint.activate([
-            topConstraint,
-            leftConstraint,
-            rightConstraint,
-            bottomConstraint,
-        ].map {
-            switch mode {
-            case .static:
-                $0.priority = .required
-            // The reason why this priority is set to .required - 1 is #359, which fixed #294.
-            case .fitToBounds:
-                $0.priority = .required - 1
+        NSLayoutConstraint.activate(
+            [
+                topConstraint,
+                leftConstraint,
+                rightConstraint,
+                bottomConstraint,
+            ].map {
+                switch mode {
+                case .static:
+                    $0.priority = .required
+                // The reason why this priority is set to .required - 1 is #359, which fixed #294.
+                case .fitToBounds:
+                    $0.priority = .required - 1
+                }
+                $0.identifier = "FloatingPanel-surface-content"
+                return $0
             }
-            $0.identifier = "FloatingPanel-surface-content"
-            return $0
-        })
+        )
         self.contentViewTopConstraint = topConstraint
         self.contentViewLeftConstraint = leftConstraint
         self.contentViewRightConstraint = rightConstraint

Sources/Transitioning.swift

@@ -3,9 +3,11 @@
 import UIKit
 
 class ModalTransition: NSObject, UIViewControllerTransitioningDelegate {
-    func animationController(forPresented presented: UIViewController,
-                             presenting: UIViewController,
-                             source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
+    func animationController(
+        forPresented presented: UIViewController,
+        presenting: UIViewController,
+        source: UIViewController
+    ) -> UIViewControllerAnimatedTransitioning? {
         return ModalPresentTransition()
     }
 
@@ -52,11 +54,11 @@ class PresentationController: UIPresentationController {
              view is added unnecessarily.
              */
             fpc.presentedViewController == nil
-            else { return }
+        else { return }
 
-        /*
-         * Layout the views managed by `FloatingPanelController` here for the
-         * sake of the presentation and dismissal modally from the controller.
+        /**
+         Layout the views managed by `FloatingPanelController` here for the
+         sake of the presentation and dismissal modally from the controller.
          */
         addFloatingPanel()
 
@@ -72,7 +74,7 @@ class PresentationController: UIPresentationController {
         guard
             let containerView = self.containerView,
             let fpc = presentedViewController as? FloatingPanelController
-            else { fatalError() }
+        else { fatalError() }
 
         containerView.addSubview(fpc.view)
         fpc.view.frame = containerView.bounds
@@ -84,7 +86,7 @@ class ModalPresentTransition: NSObject, UIViewControllerAnimatedTransitioning {
     func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
         guard
             let fpc = transitionContext?.viewController(forKey: .to) as? FloatingPanelController
-        else { fatalError()}
+        else { fatalError() }
 
         let animator = fpc.animatorForPresenting(to: fpc.layout.initialState)
         return TimeInterval(animator.duration)
@@ -119,7 +121,7 @@ class ModalDismissTransition: NSObject, UIViewControllerAnimatedTransitioning {
     func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
         guard
             let fpc = transitionContext?.viewController(forKey: .from) as? FloatingPanelController
-        else { fatalError()}
+        else { fatalError() }
 
         let animator = fpc.animatorForDismissing(with: .zero)
         return TimeInterval(animator.duration)
@@ -139,11 +141,13 @@ class ModalDismissTransition: NSObject, UIViewControllerAnimatedTransitioning {
             fpc?.suspendTransitionAnimator(false)
             transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
         }
-        return fpc.transitionAnimator!
+        guard let transitionAnimator = fpc.transitionAnimator else {
+            fatalError("Something wrong happened in Core.move(from:to:animated:completion)")
+        }
+        return transitionAnimator
     }
 
     func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
         self.interruptibleAnimator(using: transitionContext).startAnimation()
     }
 }
-

Tests/ControllerTests.swift

@@ -1,6 +1,7 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
+
 @testable import FloatingPanel
 
 class ControllerTests: XCTestCase {
@@ -9,8 +10,8 @@ class ControllerTests: XCTestCase {
 
     func test_warningRetainCycle() {
         let exp = expectation(description: "Warning retain cycle")
-        exp.expectedFulfillmentCount = 2 // For layout & behavior logs
-        log.hook = {(log, level) in
+        exp.expectedFulfillmentCount = 2  // For layout & behavior logs
+        log.hook = { (log, level) in
             if log.contains("A memory leak will occur by a retain cycle because") {
                 XCTAssert(level == .warning)
                 exp.fulfill()
@@ -26,7 +27,6 @@ class ControllerTests: XCTestCase {
         rootVC.loadViewIfNeeded()
         rootVC.view.bounds = .init(origin: .zero, size: .init(width: 390, height: 844))
 
-
         let fpc = FloatingPanelController()
         fpc.addPanel(toParent: rootVC)
         XCTAssertEqual(fpc.surfaceLocation.y, fpc.surfaceLocation(for: .half).y)
@@ -46,8 +46,7 @@ class ControllerTests: XCTestCase {
         }
         let myDelegate = MyDelegate()
         let fpc = FloatingPanelController(delegate: myDelegate)
-        let traitCollection = UITraitCollection(traitsFrom: [fpc.traitCollection,
-                                                             UITraitCollection(userInterfaceStyle: .dark)])
+        let traitCollection = UITraitCollection(traitsFrom: [fpc.traitCollection, UITraitCollection(userInterfaceStyle: .dark)])
         XCTAssertEqual(traitCollection.userInterfaceStyle, .dark)
     }
 
@@ -60,7 +59,7 @@ class ControllerTests: XCTestCase {
 
         fpc.hide()
         XCTAssertEqual(delegate.position, .hidden)
-        
+
         fpc.move(to: .full, animated: false)
         XCTAssertEqual(fpc.state, .full)
         XCTAssertEqual(delegate.position, .full)
@@ -193,18 +192,18 @@ class ControllerTests: XCTestCase {
         XCTAssertEqual(delegate.position, .hidden)
         XCTAssertEqual(fpc.surfaceLocation.y, fpc.surfaceLocation(for: .hidden).y)
     }
-    
+
     func test_moveWithNearbyPosition() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         XCTAssertEqual(delegate.position, .hidden)
         fpc.showForTest()
-        
+
         XCTAssertEqual(fpc.nearbyState, .half)
-        
+
         fpc.hide()
         XCTAssertEqual(fpc.nearbyState, .tip)
-        
+
         fpc.move(to: .full, animated: false)
         XCTAssertEqual(fpc.nearbyState, .full)
         XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.surfaceLocation(for: .full).y)
@@ -340,15 +339,21 @@ private class MyZombieViewController: UIViewController, FloatingPanelLayout, Flo
         return .half
     }
 
-    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0,
-                                             edge: .top,
-                                             referenceGuide: .superview),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0,
-                                             edge: .bottom,
-                                             referenceGuide: .superview),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 60.0,
-                                            edge: .bottom,
-                                            referenceGuide: .superview),
+    let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(
+            absoluteInset: UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0,
+            edge: .top,
+            referenceGuide: .superview
+        ),
+        .half: FloatingPanelLayoutAnchor(
+            absoluteInset: 250.0,
+            edge: .bottom,
+            referenceGuide: .superview
+        ),
+        .tip: FloatingPanelLayoutAnchor(
+            absoluteInset: 60.0,
+            edge: .bottom,
+            referenceGuide: .superview
+        ),
     ]
 }

Tests/CoreTests.swift

@@ -1,6 +1,7 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
+
 @testable import FloatingPanel
 
 class CoreTests: XCTestCase {
@@ -53,7 +54,7 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout1Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .full
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] =
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] =
                 [.full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview)]
         }
 
@@ -73,9 +74,9 @@ class CoreTests: XCTestCase {
     func test_getBackdropAlpha_1positionsWithInitialHidden() {
         class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
             override var initialState: FloatingPanelState { .hidden }
-            override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
                 return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: fullInset, edge: .top, referenceGuide: referenceGuide),
+                    .full: FloatingPanelLayoutAnchor(absoluteInset: fullInset, edge: .top, referenceGuide: referenceGuide)
                 ]
             }
         }
@@ -88,7 +89,7 @@ class CoreTests: XCTestCase {
         let fullPos = fpc.surfaceLocation(for: .full).y
         let hiddenPos = fpc.surfaceLocation(for: .hidden).y
 
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos - 100.0, with:  -100.0), 0.3)
+        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos - 100.0, with: -100.0), 0.3)
         XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: 0.0), 0.3)
         XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: hiddenPos, with: 100.0), 0.0)
     }
@@ -97,7 +98,7 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .half
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
                 .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
                 .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
             ]
@@ -127,7 +128,7 @@ class CoreTests: XCTestCase {
     func test_getBackdropAlpha_2positionsWithHidden() {
         class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
             override var initialState: FloatingPanelState { .hidden }
-            override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
                 return [
                     .full: FloatingPanelLayoutAnchor(absoluteInset: fullInset, edge: .top, referenceGuide: referenceGuide),
                     .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: referenceGuide),
@@ -143,7 +144,7 @@ class CoreTests: XCTestCase {
         let fullPos = fpc.surfaceLocation(for: .full).y
         let hiddenPos = fpc.surfaceLocation(for: .hidden).y
 
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos - 100.0, with:  -100.0), 0.3)
+        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos - 100.0, with: -100.0), 0.3)
         XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: 0.0), 0.3)
         XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: hiddenPos, with: 100.0), 0.0)
     }
@@ -174,7 +175,6 @@ class CoreTests: XCTestCase {
         XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos, with: -1 * distance2), 0.0)
     }
 
-
     func test_updateBackdropAlpha() {
         class BackdropTestLayout: FloatingPanelTestLayout {
             override var initialState: FloatingPanelState { .hidden }
@@ -246,7 +246,7 @@ class CoreTests: XCTestCase {
         fpc.move(to: .full, animated: false)
         XCTAssertEqual(_floor(fpc.backdropView.alpha), 0.3)
         fpc.willTransition(to: UITraitCollection(horizontalSizeClass: .regular), with: MockTransitionCoordinator())
-        XCTAssertEqual(fpc.backdropView.alpha, 0.0) // Must update the alpha by BackdropTestLayout2 in TestDelegate.
+        XCTAssertEqual(fpc.backdropView.alpha, 0.0)  // Must update the alpha by BackdropTestLayout2 in TestDelegate.
 
         // Test a view size change of FloatingPanelController.view
 
@@ -257,7 +257,7 @@ class CoreTests: XCTestCase {
 
         delegate.layout = BackdropTestLayout2()
         fpc.viewWillTransition(to: CGSize.zero, with: MockTransitionCoordinator())
-        XCTAssertEqual(fpc.backdropView.alpha, 0.0) // Must update the alpha by BackdropTestLayout2 in TestDelegate.
+        XCTAssertEqual(fpc.backdropView.alpha, 0.0)  // Must update the alpha by BackdropTestLayout2 in TestDelegate.
     }
 
     func test_initial_surface_position() {
@@ -265,8 +265,9 @@ class CoreTests: XCTestCase {
             class Layout: FloatingPanelLayout {
                 let initialState: FloatingPanelState = .full
                 let position: FloatingPanelPosition = .top
-                let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring]
-                    = [.full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .bottom, referenceGuide: .superview)]
+                let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+                    .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .bottom, referenceGuide: .superview)
+                ]
             }
             func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
                 Layout()
@@ -288,8 +289,9 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout1Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .full
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring]
-                = [.full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview)]
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview)
+            ]
         }
 
         let delegate = FloatingPanelTestDelegate()
@@ -301,22 +303,25 @@ class CoreTests: XCTestCase {
         let fullPos = fpc.surfaceLocation(for: .full).y
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .full), // redirect
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .full),  // redirect
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+            ]
+        )
     }
 
     func test_targetPosition_2positions() {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .half
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
                 .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
                 .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
             ]
@@ -332,46 +337,52 @@ class CoreTests: XCTestCase {
         let halfPos = fpc.surfaceLocation(for: .half).y
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .half), // redirect
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
-            ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .half),  // project to half
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half),  // project to half
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .half),  // redirect
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+            ]
+        )
         fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .half), // redirect
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
-            ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .half),  // project to half
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half),  // project to half
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .half),  // redirect
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+            ]
+        )
     }
 
     func test_targetPosition_2positionsWithHidden() {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
                 .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
                 .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
             ]
@@ -387,38 +398,42 @@ class CoreTests: XCTestCase {
         let hiddenPos = fpc.surfaceLocation(for: .hidden).y
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, hiddenPos - 10.0, CGPoint(x: 0.0, y: -100.0), .hidden), // redirect
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 0.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // redirect
-            (#line, hiddenPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .hidden),  // project to hidden
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .hidden),  // project to hidden
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, hiddenPos - 10.0, CGPoint(x: 0.0, y: -100.0), .hidden),  // redirect
+                (#line, hiddenPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+                (#line, hiddenPos, CGPoint(x: 0.0, y: -100.0), .hidden),
+                (#line, hiddenPos, CGPoint(x: 0.0, y: 0.0), .hidden),
+                (#line, hiddenPos, CGPoint(x: 0.0, y: 100.0), .hidden),
+                (#line, hiddenPos, CGPoint(x: 0.0, y: 1000.0), .hidden),  // redirect
+                (#line, hiddenPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
             ])
         fpc.move(to: .hidden, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, hiddenPos - 10.0, CGPoint(x: 0.0, y: -100.0), .hidden), // redirect
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 0.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // redirect
-            (#line, hiddenPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .hidden),  // project to hidden
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .hidden),  // project to hidden
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, hiddenPos - 10.0, CGPoint(x: 0.0, y: -100.0), .hidden),  // redirect
+                (#line, hiddenPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+                (#line, hiddenPos, CGPoint(x: 0.0, y: -100.0), .hidden),
+                (#line, hiddenPos, CGPoint(x: 0.0, y: 0.0), .hidden),
+                (#line, hiddenPos, CGPoint(x: 0.0, y: 100.0), .hidden),
+                (#line, hiddenPos, CGPoint(x: 0.0, y: 1000.0), .hidden),  // redirect
+                (#line, hiddenPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
             ])
     }
 
@@ -434,36 +449,38 @@ class CoreTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
         // From .full
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from topMostState
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full), //project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip), // project to tip
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirect
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from bottomMostState
-        ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full),  // far from topMostState
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full),  // far from topMostState
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full),  // far from topMostState
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half),  // project to half
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  //project to full
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),  // project to tip
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirect
+                (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip),  // redirect
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half),  // project to half
+                (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to full at half
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip),  // far from bottomMostState
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip),  // far from bottomMostState
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip),  // far from bottomMostState
+            ])
     }
 
     func test_targetPosition_3positionsFromFull_bottomEdge() {
@@ -478,36 +495,38 @@ class CoreTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
         // From .full
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, tipPos - 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from topMostState
-            (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from topMostState
-            (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from topMostState
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to full at half
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 100.0), .tip), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .tip), //project to tip
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .full), // project to full
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: -100.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from bottomMostState
-            (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from bottomMostState
-            (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from bottomMostState
-        ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: -100.0), .tip),  // far from topMostState
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 0.0), .tip),  // far from topMostState
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 100.0), .tip),  // far from topMostState
+                (#line, tipPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 500.0), .half),  // project to half
+                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to full at half
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 100.0), .tip),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .tip),  //project to tip
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .full),  // project to full
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirect
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: -100.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -500.0), .half),  // project to half
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: -100.0), .full),  // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 0.0), .full),  // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 100.0), .full),  // far from bottomMostState
+            ])
     }
 
     func test_targetPosition_3positionsFromHalf() {
@@ -522,34 +541,36 @@ class CoreTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
         // From .half
         fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from topMostState
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),// project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip), // project to tip
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirect
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from bottomMostState
-        ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full),  // far from topMostState
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full),  // far from topMostState
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full),  // far from topMostState
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half),  // project to half
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),  // project to tip
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirect
+                (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip),  // redirect
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half),  // project to half
+                (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip),  // far from bottomMostState
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip),  // far from bottomMostState
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip),  // far from bottomMostState
+            ])
     }
 
     func test_targetPosition_3positionsFromHalf_bottomEdge() {
@@ -557,40 +578,42 @@ class CoreTests: XCTestCase {
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3PositionsBottomEdge()
 
-            fpc.showForTest()
+        fpc.showForTest()
 
-            let fullPos = fpc.surfaceLocation(for: .full).y
-            let halfPos = fpc.surfaceLocation(for: .half).y
-            let tipPos = fpc.surfaceLocation(for: .tip).y
-            // From .half
-            fpc.move(to: .half, animated: false)
-            assertTargetPosition(fpc.floatingPanel, with: [
-                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from topMostState
-                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from topMostState
-                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from topMostState
+        let fullPos = fpc.surfaceLocation(for: .full).y
+        let halfPos = fpc.surfaceLocation(for: .half).y
+        let tipPos = fpc.surfaceLocation(for: .tip).y
+        // From .half
+        fpc.move(to: .half, animated: false)
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: -100.0), .tip),  // far from topMostState
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 0.0), .tip),  // far from topMostState
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 100.0), .tip),  // far from topMostState
                 (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
                 (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-                (#line, tipPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to full at half
-                (#line, tipPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to full at half
-                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 100.0), .tip), // redirect
-                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .tip),// project to tip
+                (#line, tipPos, CGPoint(x: 0.0, y: 500.0), .half),  // project to half
+                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to full at half
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 100.0), .tip),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .tip),  // project to tip
                 (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
                 (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
                 (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .full), // project to full
-                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: -100.0), .full), // redirect
-                (#line, fullPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to tip at half
-                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to tip at half
-                (#line, fullPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .full),  // project to full
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirect
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: -100.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -500.0), .half),  // project to half
                 (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
                 (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
                 (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from bottomMostState
-                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from bottomMostState
-                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: -100.0), .full),  // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 0.0), .full),  // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 100.0), .full),  // far from bottomMostState
             ])
     }
 
@@ -607,34 +630,36 @@ class CoreTests: XCTestCase {
 
         // From .tip
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from topMostState
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -3000.0), .full), // project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip), // project to tip
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirect
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from bottomMostState
-        ])
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full),  // far from topMostState
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full),  // far from topMostState
+                (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full),  // far from topMostState
+                (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
+                (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half),  // project to half
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half),  // block projecting to tip at half
+                (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to tip at half
+                (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -3000.0), .full),  // project to full
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),  // project to tip
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirect
+                (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip),  // redirect
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half),  // block projecting to full at half
+                (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half),  // project to half
+                (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip),  // far from bottomMostState
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip),  // far from bottomMostState
+                (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip),  // far from bottomMostState
+            ])
     }
 
     func test_targetPosition_3positionsFromTip_bottomEdge() {
@@ -644,39 +669,41 @@ class CoreTests: XCTestCase {
 
         fpc.showForTest()
 
-            let fullPos = fpc.surfaceLocation(for: .full).y
-            let halfPos = fpc.surfaceLocation(for: .half).y
-            let tipPos = fpc.surfaceLocation(for: .tip).y
+        let fullPos = fpc.surfaceLocation(for: .full).y
+        let halfPos = fpc.surfaceLocation(for: .half).y
+        let tipPos = fpc.surfaceLocation(for: .tip).y
 
-            // From .tip
-            fpc.move(to: .tip, animated: false)
-            assertTargetPosition(fpc.floatingPanel, with: [
-                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from topMostState
-                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from topMostState
-                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from topMostState
+        // From .tip
+        fpc.move(to: .tip, animated: false)
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: -100.0), .tip),  // far from topMostState
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 0.0), .tip),  // far from topMostState
+                (#line, tipPos - 500.0, CGPoint(x: 0.0, y: 100.0), .tip),  // far from topMostState
                 (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
                 (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-                (#line, tipPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-                (#line, tipPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 100.0), .tip), // redirect
-                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-                (#line, halfPos, CGPoint(x: 0.0, y: -3000.0), .tip), // project to full
+                (#line, tipPos, CGPoint(x: 0.0, y: 500.0), .half),  // project to half
+                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .half),  // block projecting to tip at half
+                (#line, tipPos, CGPoint(x: 0.0, y: 3000.0), .half),  // block projecting to tip at half
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 100.0), .tip),  // redirect
+                (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half),  // redirect
+                (#line, halfPos, CGPoint(x: 0.0, y: -3000.0), .tip),  // project to full
                 (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
                 (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
                 (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .full), // project to tip
-                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: -100.0), .full), // redirect
-                (#line, fullPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-                (#line, fullPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .full),  // project to tip
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirect
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: -100.0), .full),  // redirect
+                (#line, fullPos, CGPoint(x: 0.0, y: -3000.0), .half),  // block projecting to full at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .half),  // block projecting to full at half
+                (#line, fullPos, CGPoint(x: 0.0, y: -500.0), .half),  // project to half
                 (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
                 (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
                 (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from bottomMostState
-                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from bottomMostState
-                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: -100.0), .full),  // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 0.0), .full),  // far from bottomMostState
+                (#line, fullPos + 500.0, CGPoint(x: 0.0, y: 100.0), .full),  // far from bottomMostState
             ])
     }
 
@@ -694,37 +721,43 @@ class CoreTests: XCTestCase {
 
         // From .full
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .full),
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .tip),
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
+                (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .full),
             ])
 
         // From .half
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
+                (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
             ])
 
         // From .tip
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .full),
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .tip),
+                (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
+                (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),
+                (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .full),
             ])
     }
 
@@ -732,7 +765,7 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout3PositionsWithHidden: FloatingPanelLayout {
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
                 .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
                 .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
                 .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
@@ -746,15 +779,19 @@ class CoreTests: XCTestCase {
         XCTAssertEqual(fpc.state, .hidden)
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 1000.0), .half),
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 1000.0), .half)
             ])
         fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 1000.0), .hidden),
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: -1000.0), .full),
+                (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 1000.0), .hidden),
             ])
     }
 
@@ -762,7 +799,7 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout3Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
-            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
                 .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
                 .tip: FloatingPanelLayoutAnchor(absoluteInset: 60.0, edge: .bottom, referenceGuide: .superview),
                 .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
@@ -782,27 +819,31 @@ class CoreTests: XCTestCase {
         //let hiddenPos = fpc.surfaceLocation(for: .hidden)
 
         fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 385.0), .tip), // projection
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // projection
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirection
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirection
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), //projection
-            (#line, tipPos, CGPoint(x: 0.0, y: -10.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 10.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .hidden), //projection
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 10.0), .tip), // redirection
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: 10.0), .tip), // redirection
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
+                (#line, halfPos, CGPoint(x: 0.0, y: 385.0), .tip),  // projection
+                (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .hidden),  // projection
+                (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half),  // redirection
+                (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip),  // redirection
+                (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half),  //projection
+                (#line, tipPos, CGPoint(x: 0.0, y: -10.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 10.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .hidden),  //projection
+                (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 10.0), .tip),  // redirection
+                (#line, tipPos - 10.0, CGPoint(x: 0.0, y: 10.0), .tip),  // redirection
             ])
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .hidden),
+        assertTargetPosition(
+            fpc.floatingPanel,
+            with: [
+                (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half),
+                (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
+                (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .hidden),
             ])
     }
 
@@ -826,7 +867,7 @@ private class FloatingPanelLayout3PositionsBottomEdge: FloatingPanelTop2BottomTe
     }
 }
 
-private typealias TestParameter = (UInt, CGFloat,  CGPoint, FloatingPanelState)
+private typealias TestParameter = (UInt, CGFloat, CGPoint, FloatingPanelState)
 private func assertTargetPosition(_ floatingPanel: Core, with params: [TestParameter]) {
     params.forEach { (line, pos, velocity, result) in
         floatingPanel.surfaceView.frame.origin.y = pos

Tests/ExtensionTests.swift

@@ -1,6 +1,7 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
+
 @testable import FloatingPanel
 
 class ExtensionTests: XCTestCase {

Tests/LayoutTests.swift

@@ -1,6 +1,7 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
+
 @testable import FloatingPanel
 
 class LayoutTests: XCTestCase {
@@ -20,7 +21,7 @@ class LayoutTests: XCTestCase {
             let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
                 .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .top, referenceGuide: .safeArea),
                 .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
-                .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview)
+                .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
             ]
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
@@ -44,7 +45,7 @@ class LayoutTests: XCTestCase {
 
     func test_layoutSegment_3position() {
         class FloatingPanelLayout3Positions: FloatingPanelTestLayout {
-            override var initialState: FloatingPanelState  { .half }
+            override var initialState: FloatingPanelState { .half }
         }
 
         fpc.layout = FloatingPanelLayout3Positions()
@@ -56,25 +57,29 @@ class LayoutTests: XCTestCase {
         let minPos = CGFloat.leastNormalMagnitude
         let maxPos = CGFloat.greatestFiniteMagnitude
 
-        assertLayoutSegment(fpc.floatingPanel, with: [
-            (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
-            (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
-            (#line, pos: fullPos, forwardY: true, lower: .full, upper: .half),
-            (#line, pos: fullPos, forwardY: false, lower: nil,  upper: .full),
-            (#line, pos: halfPos, forwardY: true, lower: .half, upper: .tip),
-            (#line, pos: halfPos, forwardY: false, lower: .full,  upper: .half),
-            (#line, pos: tipPos, forwardY: true, lower: .tip, upper: nil),
-            (#line, pos: tipPos, forwardY: false, lower: .half,  upper: .tip),
-            (#line, pos: maxPos, forwardY: true, lower: .tip, upper: nil),
-            (#line, pos: maxPos, forwardY: false, lower: .tip, upper: nil),
-            ])
+        assertLayoutSegment(
+            fpc.floatingPanel,
+            with: [
+                (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
+                (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
+                (#line, pos: fullPos, forwardY: true, lower: .full, upper: .half),
+                (#line, pos: fullPos, forwardY: false, lower: nil, upper: .full),
+                (#line, pos: halfPos, forwardY: true, lower: .half, upper: .tip),
+                (#line, pos: halfPos, forwardY: false, lower: .full, upper: .half),
+                (#line, pos: tipPos, forwardY: true, lower: .tip, upper: nil),
+                (#line, pos: tipPos, forwardY: false, lower: .half, upper: .tip),
+                (#line, pos: maxPos, forwardY: true, lower: .tip, upper: nil),
+                (#line, pos: maxPos, forwardY: false, lower: .tip, upper: nil),
+            ]
+        )
     }
 
     func test_layoutSegment_2positions() {
         class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            override var initialState: FloatingPanelState  { .half }
-            override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring]
-                { super.anchors.filter { (key, _) in key != .tip } }
+            override var initialState: FloatingPanelState { .half }
+            override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+                super.anchors.filter { (key, _) in key != .tip }
+            }
         }
 
         fpc.layout = FloatingPanelLayout2Positions()
@@ -85,23 +90,27 @@ class LayoutTests: XCTestCase {
         let minPos = CGFloat.leastNormalMagnitude
         let maxPos = CGFloat.greatestFiniteMagnitude
 
-        assertLayoutSegment(fpc.floatingPanel, with: [
-            (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
-            (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
-            (#line, pos: fullPos, forwardY: true, lower: .full, upper: .half),
-            (#line, pos: fullPos, forwardY: false, lower: nil,  upper: .full),
-            (#line, pos: halfPos, forwardY: true, lower: .half, upper: nil),
-            (#line, pos: halfPos, forwardY: false, lower: .full,  upper: .half),
-            (#line, pos: maxPos, forwardY: true, lower: .half, upper: nil),
-            (#line, pos: maxPos, forwardY: false, lower: .half, upper: nil),
-            ])
+        assertLayoutSegment(
+            fpc.floatingPanel,
+            with: [
+                (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
+                (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
+                (#line, pos: fullPos, forwardY: true, lower: .full, upper: .half),
+                (#line, pos: fullPos, forwardY: false, lower: nil, upper: .full),
+                (#line, pos: halfPos, forwardY: true, lower: .half, upper: nil),
+                (#line, pos: halfPos, forwardY: false, lower: .full, upper: .half),
+                (#line, pos: maxPos, forwardY: true, lower: .half, upper: nil),
+                (#line, pos: maxPos, forwardY: false, lower: .half, upper: nil),
+            ]
+        )
     }
 
     func test_layoutSegment_1positions() {
         class FloatingPanelLayout1Positions: FloatingPanelTestLayout {
-            override var initialState: FloatingPanelState  { .full }
-            override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring]
-                { super.anchors.filter { (key, _) in key == .full } }
+            override var initialState: FloatingPanelState { .full }
+            override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+                super.anchors.filter { (key, _) in key == .full }
+            }
         }
 
         fpc.layout = FloatingPanelLayout1Positions()
@@ -111,14 +120,17 @@ class LayoutTests: XCTestCase {
         let minPos = CGFloat.leastNormalMagnitude
         let maxPos = CGFloat.greatestFiniteMagnitude
 
-        assertLayoutSegment(fpc.floatingPanel, with: [
-            (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
-            (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
-            (#line, pos: fullPos, forwardY: true, lower: .full, upper: nil),
-            (#line, pos: fullPos, forwardY: false, lower: nil,  upper: .full),
-            (#line, pos: maxPos, forwardY: true, lower: .full, upper: nil),
-            (#line, pos: maxPos, forwardY: false, lower: .full, upper: nil),
-            ])
+        assertLayoutSegment(
+            fpc.floatingPanel,
+            with: [
+                (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
+                (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
+                (#line, pos: fullPos, forwardY: true, lower: .full, upper: nil),
+                (#line, pos: fullPos, forwardY: false, lower: nil, upper: .full),
+                (#line, pos: maxPos, forwardY: true, lower: .full, upper: nil),
+                (#line, pos: maxPos, forwardY: false, lower: .full, upper: nil),
+            ]
+        )
     }
 
     func test_updateInteractiveEdgeConstraint() {
@@ -126,40 +138,50 @@ class LayoutTests: XCTestCase {
         fpc.move(to: .full, animated: false)
 
         fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.state)
-        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.state) // Should be ignore
+        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.state)  // Should be ignore
 
         let fullPos = fpc.surfaceLocation(for: .full).y
         let tipPos = fpc.surfaceLocation(for: .tip).y
 
         var next: CGFloat
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: -100.0,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: -100.0,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos + 100.0)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: tipPos - fullPos,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: tipPos - fullPos,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, tipPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: tipPos - fullPos + 100.0,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: tipPos - fullPos + 100.0,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, tipPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: tipPos - fullPos + 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: tipPos - fullPos + 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, tipPos + 100.0)
 
@@ -171,11 +193,10 @@ class LayoutTests: XCTestCase {
         fpc.showForTest()
         fpc.move(to: .tip, animated: false)
         XCTAssertEqual(fpc.surfaceView.frame, CGRect(x: 0.0, y: -667.0 + 60.0, width: 375.0, height: 667))
-        XCTAssertEqual(fpc.surfaceView.containerView.frame, CGRect(x: 0.0, y: -667.0,
-                                                                   width: 375.0, height: 667 * 2.0))
+        XCTAssertEqual(fpc.surfaceView.containerView.frame, CGRect(x: 0.0, y: -667.0, width: 375.0, height: 667 * 2.0))
 
         fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.state)
-        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.state) // Should be ignore
+        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.state)  // Should be ignore
 
         XCTAssertEqual(fpc.floatingPanel.layoutAdapter.interactionConstraint?.constant, 60.0)
 
@@ -185,33 +206,43 @@ class LayoutTests: XCTestCase {
         var pre: CGFloat
         var next: CGFloat
         pre = fpc.surfaceLocation.y
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: -100.0,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: -100.0,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, pre)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, tipPos + 100.0)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: fullPos - tipPos,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: fullPos - tipPos,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: fullPos - tipPos + 100,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: fullPos - tipPos + 100,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: fullPos - tipPos + 100,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: fullPos - tipPos + 100,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos + 100.0)
 
@@ -238,21 +269,27 @@ class LayoutTests: XCTestCase {
 
         var next: CGFloat
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: -100.0,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: -100.0,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: -100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: -100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos - 100.0)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: hiddenPos - fullPos + 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: hiddenPos - fullPos + 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, hiddenPos + 100.0)
 
@@ -279,21 +316,27 @@ class LayoutTests: XCTestCase {
 
         var next: CGFloat
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: 100.0,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: 100.0,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos + 100.0)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: hiddenPos - fullPos + 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: hiddenPos - fullPos + 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, hiddenPos + 100.0)
 
@@ -317,21 +360,27 @@ class LayoutTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
 
         var next: CGFloat
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: -100.0,
-                                                                        scrollingContent: true,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: -100.0,
+            scrollingContent: true,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: -100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: -100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, fullPos - 100)
 
-        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(diff: tipPos - fullPos + 100.0,
-                                                                        scrollingContent: false,
-                                                                        allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:))
+        fpc.floatingPanel.layoutAdapter.updateInteractiveEdgeConstraint(
+            diff: tipPos - fullPos + 100.0,
+            scrollingContent: false,
+            allowsRubberBanding: fpc.floatingPanel.behaviorAdapter.allowsRubberBanding(for:)
+        )
         next = fpc.surfaceLocation.y
         XCTAssertEqual(next, tipPos + 100)
 
@@ -366,7 +415,7 @@ class LayoutTests: XCTestCase {
         XCTAssertEqual(fpc.layout.anchors.filter({ $0.value.referenceGuide != .safeArea }).count, 0)
         XCTAssertEqual(fpc.surfaceLocation(for: .full).y, myLayout.fullInset + fpc.fp_safeAreaInsets.top)
         XCTAssertEqual(fpc.surfaceLocation(for: .half).y, bounds.height - myLayout.halfInset + fpc.fp_safeAreaInsets.bottom)
-        XCTAssertEqual(fpc.surfaceLocation(for: .tip).y, bounds.height - myLayout.tipInset +  fpc.fp_safeAreaInsets.bottom)
+        XCTAssertEqual(fpc.surfaceLocation(for: .tip).y, bounds.height - myLayout.tipInset + fpc.fp_safeAreaInsets.bottom)
         XCTAssertEqual(fpc.surfaceLocation(for: .hidden).y, bounds.height + 100.0)
     }
 
@@ -375,7 +424,7 @@ class LayoutTests: XCTestCase {
         fpc.loadViewIfNeeded()
         fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
 
-        class MyFloatingPanelFullLayout: FloatingPanelTop2BottomTestLayout { }
+        class MyFloatingPanelFullLayout: FloatingPanelTop2BottomTestLayout {}
         class MyFloatingPanelSafeAreaLayout: FloatingPanelTop2BottomTestLayout {
             override var referenceGuide: FloatingPanelLayoutReferenceGuide {
                 return .safeArea
@@ -389,10 +438,9 @@ class LayoutTests: XCTestCase {
         XCTAssertEqual(fpc.layout.anchors.filter({ $0.value.referenceGuide != .superview }).count, 0)
         XCTAssertEqual(fpc.surfaceLocation(for: .full).y, bounds.height - myLayout.fullInset)
         XCTAssertEqual(fpc.surfaceLocation(for: .half).y, myLayout.halfInset)
-        XCTAssertEqual(fpc.surfaceLocation(for: .tip).y,  myLayout.tipInset)
+        XCTAssertEqual(fpc.surfaceLocation(for: .tip).y, myLayout.tipInset)
         XCTAssertEqual(fpc.surfaceLocation(for: .hidden).y, -100.0)
 
-
         fpc.layout = MyFloatingPanelSafeAreaLayout()
 
         XCTAssertEqual(fpc.layout.anchors.filter({ $0.value.referenceGuide != .safeArea }).count, 0)
@@ -410,61 +458,93 @@ class LayoutTests: XCTestCase {
 
         for prop in [
             // from top edge
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .safeArea),
-             result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
-             result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
-             result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .superview),
-             result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .safeArea),
+                result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
+                result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
+                result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .superview),
+                result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
             // from bottom edge
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, constant: 0.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, constant: 100.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .superview),
-             result: (#line, constant: 0.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .superview),
-             result: (#line, constant: 100.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)),
-            ] {
-                let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
-                XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
-                XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
-                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, constant: 0.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, constant: 100.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .superview),
+                result: (#line, constant: 0.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .superview),
+                result: (#line, constant: 100.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.bottomAnchor)
+            ),
+        ] {
+            let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
+            XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
+            XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
+            XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
 
         // fractional
         for prop in [
             // from top edge
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .safeArea),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .safeArea),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .superview),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .superview),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .safeArea),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .safeArea),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .superview),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .superview),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)
+            ),
 
             // from bottom edge
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .superview),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)),
-            ] {
-                let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
-                XCTAssertEqual(c.multiplier, CGFloat(prop.result.multiplier), line: UInt(prop.result.0))
-                XCTAssertTrue(c.firstAnchor is NSLayoutAnchor<NSLayoutDimension>, line: UInt(prop.result.0))
-                // On iOS 10, `c.secondAnchor` can't be equal object to `prop.result.secondAnchor`
-                // because there is no safe area  on iOS 10 and `fp_safeAreaLayoutGuide` emulates it.
-                if #available(iOS 11, *) {
-                    XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
-                }
-                print(c)
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .superview),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)
+            ),
+        ] {
+            let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
+            XCTAssertEqual(c.multiplier, CGFloat(prop.result.multiplier), line: UInt(prop.result.0))
+            XCTAssertTrue(c.firstAnchor is NSLayoutAnchor<NSLayoutDimension>, line: UInt(prop.result.0))
+            // On iOS 10, `c.secondAnchor` can't be equal object to `prop.result.secondAnchor`
+            // because there is no safe area  on iOS 10 and `fp_safeAreaLayoutGuide` emulates it.
+            if #available(iOS 11, *) {
+                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
+            }
+            print(c)
         }
     }
     func test_layoutAnchor_bottomPosition() {
@@ -476,62 +556,94 @@ class LayoutTests: XCTestCase {
 
         for prop in [
             // from top edge
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .safeArea),
-             result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
-             result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
-             result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .superview),
-             result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.topAnchor)),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .safeArea),
+                result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
+                result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
+                result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .superview),
+                result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
 
             // from bottom edge
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, constant: 0.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, constant: 100.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .superview),
-             result: (#line, constant: 0.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .superview),
-             result: (#line, constant: 100.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)),
-            ] {
-                let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
-                XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
-                XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
-                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, constant: 0.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, constant: 100.0, firstAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .bottom, referenceGuide: .superview),
+                result: (#line, constant: 0.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .bottom, referenceGuide: .superview),
+                result: (#line, constant: 100.0, firstAnchor: fpc.view.bottomAnchor, secondAnchor: fpc.surfaceView.topAnchor)
+            ),
+        ] {
+            let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
+            XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
+            XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
+            XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
 
         // fractional
         for prop in [
             // from top edge
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .safeArea),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .safeArea),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .superview),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .superview),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .safeArea),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .safeArea),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .top, referenceGuide: .superview),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .top, referenceGuide: .superview),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)
+            ),
 
             // from bottom edge
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .superview),
-             result: (#line, multiplier: 1.0, secondAnchor: nil)),
-            (anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
-             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)),
-            ] {
-                let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
-                XCTAssertEqual(c.multiplier, CGFloat(prop.result.multiplier), line: UInt(prop.result.0))
-                XCTAssertTrue(c.firstAnchor is NSLayoutAnchor<NSLayoutDimension>, line: UInt(prop.result.0))
-                // On iOS 10, `c.secondAnchor` can't be equal object to `prop.result.secondAnchor`
-                // because there is no safe area  on iOS 10 and `fp_safeAreaLayoutGuide` emulates it.
-                if #available(iOS 11, *) {
-                    XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
-                }
-                print(c)
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.fp_safeAreaLayoutGuide.heightAnchor)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.0, edge: .bottom, referenceGuide: .superview),
+                result: (#line, multiplier: 1.0, secondAnchor: nil)
+            ),
+            (
+                anchor: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
+                result: (#line, multiplier: 0.5, secondAnchor: fpc.view.heightAnchor)
+            ),
+        ] {
+            let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
+            XCTAssertEqual(c.multiplier, CGFloat(prop.result.multiplier), line: UInt(prop.result.0))
+            XCTAssertTrue(c.firstAnchor is NSLayoutAnchor<NSLayoutDimension>, line: UInt(prop.result.0))
+            // On iOS 10, `c.secondAnchor` can't be equal object to `prop.result.secondAnchor`
+            // because there is no safe area  on iOS 10 and `fp_safeAreaLayoutGuide` emulates it.
+            if #available(iOS 11, *) {
+                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
+            }
+            print(c)
         }
     }
 
@@ -556,32 +668,52 @@ class LayoutTests: XCTestCase {
         fpc.set(contentViewController: contentVC)
 
         for prop in [
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
-             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .safeArea),
-             result: (#line, constant: 420 - 42, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .superview),
-             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .superview),
-             result: (#line, constant: 420 - 42, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
+                result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .safeArea),
+                result: (#line, constant: 420 - 42, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .superview),
+                result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .superview),
+                result: (#line, constant: 420 - 42, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
 
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
-             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
-             result: (#line, constant: 210, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .safeArea),
-             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .superview),
-             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .superview),
-             result: (#line, constant: 210, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .superview),
-             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)),
-            ] {
-                let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
-                XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
-                XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
-                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+                result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
+                result: (#line, constant: 210, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .safeArea),
+                result: (#line, constant: 0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .superview),
+                result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .superview),
+                result: (#line, constant: 210, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .superview),
+                result: (#line, constant: 0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.topAnchor)
+            ),
+        ] {
+            let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
+            XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
+            XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
+            XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
     }
 
@@ -606,32 +738,52 @@ class LayoutTests: XCTestCase {
         fpc.set(contentViewController: contentVC)
 
         for prop in [
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
-             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .safeArea),
-             result: (#line, constant: -420 + 42, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .superview),
-             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .superview),
-             result: (#line, constant: -420 + 42, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
+                result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .safeArea),
+                result: (#line, constant: -420 + 42, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .superview),
+                result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .superview),
+                result: (#line, constant: -420 + 42, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)
+            ),
 
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
-             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
-             result: (#line, constant: -210, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .safeArea),
-             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .superview),
-             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .superview),
-             result: (#line, constant: -210, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)),
-            (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .superview),
-             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)),
-            ] {
-                let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
-                XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
-                XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
-                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+                result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
+                result: (#line, constant: -210, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .safeArea),
+                result: (#line, constant: 0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .superview),
+                result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .superview),
+                result: (#line, constant: -210, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)
+            ),
+            (
+                anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .superview),
+                result: (#line, constant: 0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.bottomAnchor)
+            ),
+        ] {
+            let c = prop.anchor.layoutConstraints(fpc, for: position)[0]
+            XCTAssertEqual(c.constant, CGFloat(prop.result.constant), line: UInt(prop.result.0))
+            XCTAssertEqual(c.firstAnchor, prop.result.firstAnchor, line: UInt(prop.result.0))
+            XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
     }
 }

Tests/StateTests.swift

@@ -1,23 +1,24 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
+
 @testable import FloatingPanel
 
 class StateTests: XCTestCase {
-    override func setUp() { }
-    override func tearDown() { }
+    override func setUp() {}
+    override func tearDown() {}
 
     func test_nextAndPre() {
         var positions: [FloatingPanelState]
         positions = [.full, .half, .tip, .hidden]
-        XCTAssertEqual(FloatingPanelState.full.next(in: positions),  .half)
-        XCTAssertEqual(FloatingPanelState.full.pre(in: positions),  .full)
+        XCTAssertEqual(FloatingPanelState.full.next(in: positions), .half)
+        XCTAssertEqual(FloatingPanelState.full.pre(in: positions), .full)
         XCTAssertEqual(FloatingPanelState.hidden.next(in: positions), .hidden)
         XCTAssertEqual(FloatingPanelState.hidden.pre(in: positions), .tip)
 
         positions = [.full, .hidden]
-        XCTAssertEqual(FloatingPanelState.full.next(in: positions),  .hidden)
-        XCTAssertEqual(FloatingPanelState.full.pre(in: positions),  .full)
+        XCTAssertEqual(FloatingPanelState.full.next(in: positions), .hidden)
+        XCTAssertEqual(FloatingPanelState.full.pre(in: positions), .full)
         XCTAssertEqual(FloatingPanelState.hidden.next(in: positions), .hidden)
         XCTAssertEqual(FloatingPanelState.hidden.pre(in: positions), .full)
     }

Tests/SurfaceViewTests.swift

@@ -1,6 +1,7 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import XCTest
+
 @testable import FloatingPanel
 
 class SurfaceViewTests: XCTestCase {
@@ -68,12 +69,14 @@ class SurfaceViewTests: XCTestCase {
 
             switch position {
             case .top:
-                XCTAssertEqual(surface.containerView.frame,
-                               CGRect(x: 0.0, y: -height, width: 320.0, height: 480.0 * 3),
-                               line: line)
-                XCTAssertEqual(surface.convert(surface.contentView?.frame ?? .zero, from: surface.containerView),
-                               surface.bounds,
-                               line: line)
+                XCTAssertEqual(
+                    surface.containerView.frame,
+                    CGRect(x: 0.0, y: -height, width: 320.0, height: 480.0 * 3),
+                    line: line)
+                XCTAssertEqual(
+                    surface.convert(surface.contentView?.frame ?? .zero, from: surface.containerView),
+                    surface.bounds,
+                    line: line)
             case .bottom:
                 XCTAssertEqual(surface.contentView?.frame ?? .zero, surface.bounds, line: line)
             default:
@@ -82,14 +85,13 @@ class SurfaceViewTests: XCTestCase {
         }
     }
 
-
     func test_surfaceView_grabberHandle() {
         XCTContext.runActivity(named: "Bottom sheet") { _ in
             let surface = SurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
             XCTAssertNil(surface.contentView)
             surface.layoutIfNeeded()
 
-            XCTAssertEqual(surface.grabberHandle.frame.minY,  6.0)
+            XCTAssertEqual(surface.grabberHandle.frame.minY, 6.0)
             XCTAssertEqual(surface.grabberHandle.frame.width, surface.grabberHandleSize.width)
             XCTAssertEqual(surface.grabberHandle.frame.height, surface.grabberHandleSize.height)
 
@@ -97,7 +99,7 @@ class SurfaceViewTests: XCTestCase {
             surface.grabberHandleSize = CGSize(width: 44.0, height: 12.0)
             surface.setNeedsLayout()
             surface.layoutIfNeeded()
-            XCTAssertEqual(surface.grabberHandle.frame.minY,  surface.grabberHandlePadding)
+            XCTAssertEqual(surface.grabberHandle.frame.minY, surface.grabberHandlePadding)
             XCTAssertEqual(surface.grabberHandle.frame.width, surface.grabberHandleSize.width)
             XCTAssertEqual(surface.grabberHandle.frame.height, surface.grabberHandleSize.height)
         }
@@ -115,7 +117,7 @@ class SurfaceViewTests: XCTestCase {
             surface.grabberHandlePadding = 10.0
             surface.setNeedsLayout()
             surface.layoutIfNeeded()
-            XCTAssertEqual(surface.grabberHandle.frame.maxY,  surface.bounds.maxY - surface.grabberHandlePadding)
+            XCTAssertEqual(surface.grabberHandle.frame.maxY, surface.bounds.maxY - surface.grabberHandlePadding)
         }
     }
 
@@ -204,7 +206,7 @@ class SurfaceViewTests: XCTestCase {
         XCTAssert(surface.containerView.layer.cornerRadius == 0.0)
         XCTAssert(surface.containerView.layer.masksToBounds == false)
 
-        surface.containerView.layer.cornerRadius = 12.0 // Don't change it directly
+        surface.containerView.layer.cornerRadius = 12.0  // Don't change it directly
         XCTAssert(surface.containerView.layer.cornerRadius == 12.0)
         XCTAssertFalse(surface.containerView.layer.masksToBounds == true)
 
@@ -231,49 +233,65 @@ class SurfaceViewTests: XCTestCase {
 
     func test_surfaceView_grabberArea() {
         let sv = SurfaceView()
-        sv.bounds  = .init(x: 0, y: 0, width: 375, height: 500)
+        sv.bounds = .init(x: 0, y: 0, width: 375, height: 500)
         sv.grabberAreaOffset = 44.0
         // Top
         do {
             sv.position = .top
-            XCTAssertEqual(sv.grabberAreaFrame,
-                           .init(x: 0,
-                                 y: sv.bounds.height - sv.grabberAreaOffset,
-                                 width: sv.bounds.width,
-                                 height: sv.grabberAreaOffset))
+            XCTAssertEqual(
+                sv.grabberAreaFrame,
+                .init(
+                    x: 0,
+                    y: sv.bounds.height - sv.grabberAreaOffset,
+                    width: sv.bounds.width,
+                    height: sv.grabberAreaOffset
+                )
+            )
         }
         // Bottom
         do {
             sv.position = .bottom
-            XCTAssertEqual(sv.grabberAreaFrame,
-                           .init(x: 0,
-                                 y: 0,
-                                 width: sv.bounds.width,
-                                 height: sv.grabberAreaOffset))
+            XCTAssertEqual(
+                sv.grabberAreaFrame,
+                .init(
+                    x: 0,
+                    y: 0,
+                    width: sv.bounds.width,
+                    height: sv.grabberAreaOffset
+                )
+            )
         }
         // Left
         do {
             sv.position = .left
-            XCTAssertEqual(sv.grabberAreaFrame,
-                           .init(x: sv.bounds.width - sv.grabberAreaOffset,
-                                 y: 0,
-                                 width: sv.grabberAreaOffset,
-                                 height: sv.bounds.height))
+            XCTAssertEqual(
+                sv.grabberAreaFrame,
+                .init(
+                    x: sv.bounds.width - sv.grabberAreaOffset,
+                    y: 0,
+                    width: sv.grabberAreaOffset,
+                    height: sv.bounds.height
+                )
+            )
         }
         // Right
         do {
             sv.position = .right
-            XCTAssertEqual(sv.grabberAreaFrame,
-                           .init(x: 0,
-                                 y: 0,
-                                 width: sv.grabberAreaOffset,
-                                 height: sv.bounds.height))
+            XCTAssertEqual(
+                sv.grabberAreaFrame,
+                .init(
+                    x: 0,
+                    y: 0,
+                    width: sv.grabberAreaOffset,
+                    height: sv.bounds.height
+                )
+            )
         }
     }
 
     func test_surfaceView_grabberAreaDetection() {
         let sv = SurfaceView()
-        sv.bounds  = .init(x: 0, y: 0, width: 375, height: 500)
+        sv.bounds = .init(x: 0, y: 0, width: 375, height: 500)
         // Top
         do {
             sv.position = .top

Tests/TestSupports.swift

@@ -1,6 +1,7 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 import Foundation
+
 @testable import FloatingPanel
 
 func waitRunLoop(secs: TimeInterval = 0) {
@@ -40,7 +41,7 @@ class FloatingPanelTestLayout: FloatingPanelLayout {
     var referenceGuide: FloatingPanelLayoutReferenceGuide {
         return .superview
     }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
         return [
             .full: FloatingPanelLayoutAnchor(absoluteInset: fullInset, edge: .top, referenceGuide: referenceGuide),
             .half: FloatingPanelLayoutAnchor(absoluteInset: halfInset, edge: .bottom, referenceGuide: referenceGuide),
@@ -63,7 +64,7 @@ class FloatingPanelTop2BottomTestLayout: FloatingPanelLayout {
     var referenceGuide: FloatingPanelLayoutReferenceGuide {
         return .superview
     }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
         return [
             .full: FloatingPanelLayoutAnchor(absoluteInset: fullInset, edge: .bottom, referenceGuide: referenceGuide),
             .half: FloatingPanelLayoutAnchor(absoluteInset: halfInset, edge: .top, referenceGuide: referenceGuide),
@@ -98,4 +99,3 @@ class MockTransitionCoordinator: NSObject, UIViewControllerTransitionCoordinator
     var containerView: UIView { UIView() }
     var targetTransform: CGAffineTransform = .identity
 }
-

build-tools/Package.resolved

@@ -0,0 +1,50 @@
+{
+  "pins" : [
+    {
+      "identity" : "swift-argument-parser",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-argument-parser.git",
+      "state" : {
+        "revision" : "9f39744e025c7d377987f30b03770805dcb0bcd1",
+        "version" : "1.1.4"
+      }
+    },
+    {
+      "identity" : "swift-format",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-format.git",
+      "state" : {
+        "branch" : "508.0.1",
+        "revision" : "fbfe1869527923dd9f9b2edac148baccfce0dce7"
+      }
+    },
+    {
+      "identity" : "swift-syntax",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-syntax.git",
+      "state" : {
+        "revision" : "cd793adf5680e138bf2bcbaacc292490175d0dcd",
+        "version" : "508.0.0"
+      }
+    },
+    {
+      "identity" : "swift-system",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-system.git",
+      "state" : {
+        "revision" : "836bc4557b74fe6d2660218d56e3ce96aff76574",
+        "version" : "1.1.1"
+      }
+    },
+    {
+      "identity" : "swift-tools-support-core",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-tools-support-core.git",
+      "state" : {
+        "revision" : "93784c59434dbca8e8a9e4b700d0d6d94551da6a",
+        "version" : "0.5.2"
+      }
+    }
+  ],
+  "version" : 2
+}

build-tools/Package.swift

@@ -0,0 +1,37 @@
+// swift-tools-version: 5.8
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "build-tools",
+    platforms: [.macOS(.v12)],
+    products: [
+        .plugin(name: "SwiftFormatCommand", targets: ["SwiftFormatCommand"]),
+        .plugin(name: "SwiftFormatBuildTool", targets: ["SwiftFormatBuildTool"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/apple/swift-format.git", branch: "508.0.1")
+    ],
+    targets: [
+        .plugin(
+            name: "SwiftFormatCommand",
+            capability: .command(
+                intent: .sourceCodeFormatting(),
+                permissions: [
+                    .writeToPackageDirectory(reason: "")
+                ]
+            ),
+            dependencies: [
+                .product(name: "swift-format", package: "swift-format")
+            ]
+        ),
+        .plugin(
+            name: "SwiftFormatBuildTool",
+            capability: .buildTool(),
+            dependencies: [
+                .product(name: "swift-format", package: "swift-format")
+            ]
+        ),
+    ]
+)

build-tools/Plugins/SwiftFormatBuildTool/plugin.swift

@@ -0,0 +1,52 @@
+import Foundation
+import PackagePlugin
+
+@main
+struct SwiftFormatBuildTool: BuildToolPlugin {
+    func createBuildCommands(context: PluginContext, target: Target) async throws -> [Command] {
+        debugPrint("BuildToolPlugin -> \(context.package.directory)")
+        let configFile = context.package.directory.appending(".swift-format")
+        return [
+            .prebuildCommand(
+                displayName: "Run swift-format",
+                executable: try context.tool(named: "swift-format").path,
+                arguments: [
+                    "lint",
+                    "--configuration",
+                    configFile.string,
+                    "-r",
+                    "\(context.pluginWorkDirectory.string)",
+                ],
+                outputFilesDirectory: context.package.directory
+            )
+        ]
+    }
+}
+
+#if canImport(XcodeProjectPlugin)
+import XcodeProjectPlugin
+extension SwiftFormatBuildTool: XcodeBuildToolPlugin {
+    func createBuildCommands(context: XcodePluginContext, target: XcodeTarget) throws -> [Command] {
+        debugPrint("XcodeBuildToolPlugin -> \(context.xcodeProject.directory.string)")
+        let configFile = context.xcodeProject.directory.appending(".swift-format")
+        let sourceFiles = context.xcodeProject.directory.appending("Sources")
+        let testFiles = context.xcodeProject.directory.appending("Tests")
+        return [
+            .buildCommand(
+                displayName: "Run swift-format(xcode)",
+                executable: try context.tool(named: "swift-format").path,
+                arguments: [
+                    "lint",
+                    "--configuration",
+                    configFile.string,
+                    "-r",
+                    "\(sourceFiles.string)",
+                    "\(testFiles.string)",
+                ],
+                inputFiles: [],
+                outputFiles: []
+            )
+        ]
+    }
+}
+#endif

build-tools/Plugins/SwiftFormatCommand/plugin.swift

@@ -0,0 +1,72 @@
+import Foundation
+import PackagePlugin
+
+@main
+struct SwiftFormatCommand: CommandPlugin {
+    func performCommand(context: PluginContext, arguments: [String]) async throws {
+        debugPrint("CommandPlugin start: \(context)")
+
+        let swiftFormatTool = try context.tool(named: "swift-format")
+        debugPrint("XcodeCommandPlugin: swift-format: \(swiftFormatTool.path)")
+
+        let configFile = context.package.directory.appending(".swift-format")
+        debugPrint("CommandPlugin using config: \(configFile)")
+
+        var argExtractor = ArgumentExtractor(arguments)
+        let targetNames = argExtractor.extractOption(named: "target")
+        let targetsToFormat = try context.package.targets(named: targetNames)
+
+        let sourceCodeTargets = targetsToFormat.compactMap { $0 as? SourceModuleTarget }
+
+        try runCommand(swiftFormatTool, configFile: configFile, filePaths: sourceCodeTargets.map(\.directory))
+    }
+
+    func runCommand(_ swiftFormatTool: PackagePlugin.PluginContext.Tool, configFile: Path, filePaths: [Path]) throws {
+        // Invoke `swift-format` on the target directory, passing a configuration
+        // file from the package directory.
+        let swiftFormatExec = URL(fileURLWithPath: swiftFormatTool.path.string)
+        let swiftFormatArgs =
+            [
+                "--configuration",
+                "\(configFile.string)",
+                "--in-place",
+                "--recursive",
+            ] + filePaths.map(\.string)
+        let process = try Process.run(swiftFormatExec, arguments: swiftFormatArgs)
+        process.waitUntilExit()
+
+        debugPrint("result: \(process.terminationStatus)")
+
+        if process.terminationReason == .exit && process.terminationStatus == 0 {
+            print("success.")
+        } else {
+            let problem = "\(process.terminationReason):\(process.terminationStatus)"
+            Diagnostics.error("failed: \(problem)")
+        }
+    }
+}
+
+#if canImport(XcodeProjectPlugin)
+import XcodeProjectPlugin
+extension SwiftFormatCommand: XcodeCommandPlugin {
+    func performCommand(context: XcodeProjectPlugin.XcodePluginContext, arguments: [String]) throws {
+        debugPrint("start")
+
+        let swiftFormatTool = try context.tool(named: "swift-format")
+        debugPrint("swift-format executable = \(swiftFormatTool.path)")
+
+        let configFile = context.xcodeProject.directory.appending(".swift-format")
+        debugPrint("config file  = \(swiftFormatTool.path)")
+
+        var argExtractor = ArgumentExtractor(arguments)
+        let targetNames = argExtractor.extractOption(named: "target")
+        let xcodeTargets = context.xcodeProject.targets.filter { targetNames.contains($0.product?.name ?? "") }
+
+        let filePaths = xcodeTargets.flatMap(\.inputFiles).filter { $0.type == .source }.map(\.path)
+
+        debugPrint("files to format = \(filePaths.map(\.lastComponent))")
+
+        try runCommand(swiftFormatTool, configFile: configFile, filePaths: filePaths)
+    }
+}
+#endif