Version 2.8.3

This patch fixed the error at SurfaceView#L63 in Xcode 16 (#635):

> 'CALayerCornerCurve' is only available in application extensions for iOS 13.0 or newer.

.circleci/config.yml

@@ -0,0 +1,21 @@
+version: 2.1
+
+jobs:
+  test-ios14_5-iPhone_12_Pro:
+    macos:
+      xcode: 13.4.1
+    steps:
+      - checkout
+      - run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=14.5,name=iPhone 12 Pro'
+  test-ios13_7-iPhone_11_Pro:
+    macos:
+      xcode: 12.5.1
+    steps:
+      - checkout
+      - run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=13.7,name=iPhone 11 Pro'
+
+workflows:
+  test: 
+    jobs:
+      - test-ios14_5-iPhone_12_Pro
+      - test-ios13_7-iPhone_11_Pro

.github/workflows/ci.yml

@@ -4,121 +4,176 @@ on:
   push:
     branches: 
       - master
+      - next
   pull_request:
     branches: 
       - '*'
 
 jobs:
   build:
-    runs-on: ${{ matrix.runsOn }}
+    runs-on: ${{ matrix.runs-on }}
     env:
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
     strategy:
       fail-fast: false
       matrix:
         include:
+          - swift: "5.10"
+            xcode: "15.4"
+            runs-on: macos-14
+          - swift: "5.9"
+            xcode: "15.2"
+            runs-on: macos-13
+          - swift: "5.8"
+            xcode: "14.3.1"
+            runs-on: macos-13
+          - swift: "5.7"
+            xcode: "14.1"
+            runs-on: macos-12
           - swift: "5.6"
-            xcode: "13.3.1"
-            runsOn: macos-12
+            xcode: "13.4.1"
+            runs-on: macos-12
           - swift: "5.5"
             xcode: "13.2.1"
-            runsOn: macos-11
+            runs-on: macos-12
           - swift: "5.4"
             xcode: "12.5.1"
-            runsOn: macos-11
+            runs-on: macos-11
           - swift: "5.3"
             xcode: "12.4"
-            runsOn: macos-10.15
+            runs-on: macos-11
           - swift: "5.2"
             xcode: "11.7"
-            runsOn: macos-10.15
-          - swift: "5.1"
-            xcode: "11.3.1"
-            runsOn: macos-10.15
+            runs-on: macos-11
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Building in Swift ${{ matrix.swift }}
         run: xcodebuild -scheme FloatingPanel SWIFT_VERSION=${{ matrix.swift }} clean build
 
   test:
-    runs-on: ${{ matrix.runsOn }}
+    runs-on: ${{ matrix.runs-on }}
     env:
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
     strategy:
       fail-fast: false
       matrix:
         include:
-          - os: "15.4"
-            xcode: "13.3.1"
+          - os: "17.5"
+            xcode: "15.4"
+            sim: "iPhone 15 Pro"
+            parallel: NO  # Stop random test job failures
+            runs-on: macos-14
+          - os: "16.4"
+            xcode: "14.3.1"
+            sim: "iPhone 14 Pro"
+            parallel: NO  # Stop random test job failures
+            runs-on: macos-13
+          - os: "15.5"
+            xcode: "13.4.1"
             sim: "iPhone 13 Pro"
-            runsOn: macos-12
-          - os: "15.2"
-            xcode: "13.2.1"
-            sim: "iPhone 13 Pro"
-            runsOn: macos-11
-          - os: "15.0"
-            xcode: "13.1"
-            sim: "iPhone 13 Pro"
-            runsOn: macos-11
-          - os: "14.5"
-            xcode: "12.5.1"
-            sim: "iPhone 12 Pro"
-            runsOn: macos-11
-          - os: "14.4"
-            xcode: "12.4"
-            sim: "iPhone 12 Pro"
-            runsOn: macos-10.15
-          - os: "13.7"
-            xcode: "11.7"
-            sim: "iPhone 11 Pro"
-            runsOn: macos-10.15
+            parallel: NO  # Stop random test job failures
+            runs-on: macos-12
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Testing in iOS ${{ matrix.os }}
-      run: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=${{ matrix.os }},name=${{ matrix.sim }}'
+      run: |
+        xcodebuild clean test \
+          -workspace FloatingPanel.xcworkspace \
+          -scheme FloatingPanel \
+          -destination 'platform=iOS Simulator,OS=${{ matrix.os }},name=${{ matrix.sim }}' \
+          -parallel-testing-enabled '${{ matrix.parallel }}'
+    timeout-minutes: 20
 
   example:
-    runs-on: macos-12
+    runs-on: macos-14
     env:
-      DEVELOPER_DIR: /Applications/Xcode_13.3.1.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_15.4.app/Contents/Developer
     strategy:
       fail-fast: false
       matrix:
         include:
           - example: "Maps"
+          - example: "Maps-SwiftUI"
           - example: "Stocks"
           - example: "Samples"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Building ${{ matrix.example }}
-      run: xcodebuild -workspace FloatingPanel.xcworkspace -scheme ${{ matrix.example }} -sdk iphonesimulator clean build
+      run: |
+        xcodebuild clean build \
+          -workspace FloatingPanel.xcworkspace \
+          -scheme ${{ matrix.example }} \
+          -sdk iphonesimulator
 
   swiftpm:
-    runs-on: macos-12
+    runs-on: macos-14
     env:
-      DEVELOPER_DIR: /Applications/Xcode_13.3.1.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_15.4.app/Contents/Developer
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [iphoneos, iphonesimulator]
+        arch: [x86_64, arm64]
+        exclude:
+          - platform: iphoneos
+            arch: x86_64
+        include:
+          # 17.2
+          - platform: iphoneos
+            sys: "ios17.2"
+          - platform: iphonesimulator
+            sys: "ios17.2-simulator"
+    steps:
+    - uses: actions/checkout@v3
+    - name: "Swift Package Manager build"
+      run: |
+        xcrun swift build \
+          --sdk "$(xcrun --sdk ${{ matrix.platform }} --show-sdk-path)" \
+          -Xswiftc "-target" -Xswiftc "${{ matrix.arch }}-apple-${{ matrix.sys }}"
+
+  swiftpm_old:
+    runs-on: ${{ matrix.runs-on }}
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
     strategy:
       fail-fast: false
       matrix:
         include:
-          - target: "arm64-apple-ios15.4-simulator"
-          - target: "x86_64-apple-ios15.4-simulator"
+          # 16.4
+          - target: "x86_64-apple-ios16.4-simulator"
+            xcode: "14.3.1"
+            runs-on: macos-13
+          - target: "arm64-apple-ios16.4-simulator"
+            xcode: "14.3.1"
+            runs-on: macos-13
+          # 15.7
+          - target: "x86_64-apple-ios15.7-simulator"
+            xcode: "14.1"
+            runs-on: macos-12
+          - target: "arm64-apple-ios15.7-simulator"
+            xcode: "14.1"
+            runs-on: macos-12
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: "Swift Package Manager build"
-      run: swift build -Xswiftc "-sdk" -Xswiftc "`xcrun --sdk iphonesimulator --show-sdk-path`" -Xswiftc "-target" -Xswiftc "${{ matrix.target }}"
+      run: |
+        swift build \
+          -Xswiftc "-sdk" -Xswiftc "`xcrun --sdk iphonesimulator --show-sdk-path`" \
+          -Xswiftc "-target" -Xswiftc "${{ matrix.target }}"
 
   carthage:
     runs-on: macos-11
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: "Carthage build"
       run: carthage build --use-xcframeworks --no-skip-current
 
   cocoapods:
-    runs-on: macos-12
+    runs-on: macos-14
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_15.4.app/Contents/Developer
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: "CocoaPods: pod lib lint"
       run: pod lib lint --allow-warnings
     - name: "CocoaPods: pod spec lint"

.spi.yml

@@ -0,0 +1,5 @@
+version: 1
+builder:
+  configs:
+    - documentation_targets: [FloatingPanel]
+      platform: ios

.swiftformat

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

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

@@ -99,7 +99,7 @@ struct FloatingPanelView<Content: View, FloatingPanelContent: View>: UIViewContr
             let contentViewController = UIViewController()
             contentViewController.view.addSubview(hostingViewController.view)
             fpc.set(contentViewController: contentViewController)
-            fpc.addPanel(toParent: parentViewController, at: 1, animated: false)
+            fpc.addPanel(toParent: parentViewController, animated: false)
 
             hostingViewController.view.translatesAutoresizingMaskIntoConstraints = false
             let bottomConstraint = hostingViewController.view.bottomAnchor.constraint(equalTo: contentViewController.view.bottomAnchor)

Examples/Maps/Maps.xcodeproj/project.pbxproj

@@ -18,6 +18,7 @@
 		54B51134216C3D860033A6F3 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 54B51132216C3D860033A6F3 /* LaunchScreen.storyboard */; };
 		54E26CB624A989090066C720 /* Utils.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E26CB524A989090066C720 /* Utils.swift */; };
 		54E26CB824A98E310066C720 /* DetailViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E26CB724A98E310066C720 /* DetailViewController.swift */; };
+		5D82A6A728D18422006A44BA /* libswiftCoreGraphics.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = 5D82A6A628D1841E006A44BA /* libswiftCoreGraphics.tbd */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -47,6 +48,7 @@
 		54B51135216C3D860033A6F3 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		54E26CB524A989090066C720 /* Utils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Utils.swift; sourceTree = "<group>"; };
 		54E26CB724A98E310066C720 /* DetailViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DetailViewController.swift; sourceTree = "<group>"; };
+		5D82A6A628D1841E006A44BA /* libswiftCoreGraphics.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libswiftCoreGraphics.tbd; path = usr/lib/swift/libswiftCoreGraphics.tbd; sourceTree = SDKROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -55,6 +57,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				543844BD23D2BE2000D5EDE4 /* MapKit.framework in Frameworks */,
+				5D82A6A728D18422006A44BA /* libswiftCoreGraphics.tbd in Frameworks */,
 				549D23D2233C77D5008EF4D7 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -65,6 +68,7 @@
 		543844BB23D2BE1F00D5EDE4 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				5D82A6A628D1841E006A44BA /* libswiftCoreGraphics.tbd */,
 				543844BC23D2BE2000D5EDE4 /* MapKit.framework */,
 			);
 			name = Frameworks;
@@ -336,6 +340,10 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -355,6 +363,10 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;

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

@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="19455" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="21701" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina6_12" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="19454"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="21679"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
@@ -11,16 +13,16 @@
             <objects>
                 <viewController id="BYZ-38-t0r" customClass="MainViewController" customModule="Maps" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <mapView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" mapType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="5Jw-n2-Cpw">
-                                <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                                <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                             </mapView>
                             <visualEffectView opaque="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="d9i-3g-8Ja">
-                                <rect key="frame" x="0.0" y="0.0" width="600" height="0.0"/>
+                                <rect key="frame" x="0.0" y="0.0" width="393" height="59"/>
                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="lMa-xa-AVV">
-                                    <rect key="frame" x="0.0" y="0.0" width="600" height="0.0"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="393" height="59"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                 </view>
                                 <blurEffect style="prominent"/>
@@ -52,31 +54,31 @@
             <objects>
                 <viewController storyboardIdentifier="SearchViewController" useStoryboardIdentifierAsRestorationIdentifier="YES" id="0S1-Lk-JgE" customClass="SearchViewController" customModule="Maps" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Ncl-E9-yRn">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <visualEffectView opaque="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Ye3-uU-bq3">
-                                <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                                <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="ED1-gT-FBj">
-                                    <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                     <subviews>
                                         <searchBar contentMode="redraw" searchBarStyle="minimal" translatesAutoresizingMaskIntoConstraints="NO" id="Zcj-SE-gb8">
-                                            <rect key="frame" x="0.0" y="6" width="600" height="51"/>
+                                            <rect key="frame" x="0.0" y="6" width="393" height="56"/>
                                             <textInputTraits key="textInputTraits"/>
                                         </searchBar>
-                                        <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="D7r-re-InH">
-                                            <rect key="frame" x="0.0" y="61" width="600" height="539"/>
+                                        <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="D7r-re-InH">
+                                            <rect key="frame" x="0.0" y="66" width="393" height="786"/>
                                             <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                             <view key="tableHeaderView" contentMode="scaleToFill" id="u28-LY-hIh" customClass="SearchHeaderView" customModule="Maps" customModuleProvider="target">
-                                                <rect key="frame" x="0.0" y="0.0" width="600" height="116"/>
+                                                <rect key="frame" x="0.0" y="0.0" width="393" height="116"/>
                                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                 <subviews>
                                                     <stackView opaque="NO" contentMode="scaleToFill" distribution="equalSpacing" baselineRelativeArrangement="YES" translatesAutoresizingMaskIntoConstraints="NO" id="era-8w-yA1">
-                                                        <rect key="frame" x="24" y="10.5" width="552" height="97.5"/>
+                                                        <rect key="frame" x="24" y="10.666666666666664" width="345" height="97.333333333333343"/>
                                                         <subviews>
                                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="6" translatesAutoresizingMaskIntoConstraints="NO" id="auI-1v-Yfk">
-                                                                <rect key="frame" x="0.0" y="0.0" width="60" height="97.5"/>
+                                                                <rect key="frame" x="0.0" y="0.0" width="60" height="97.333333333333329"/>
                                                                 <subviews>
                                                                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="food" translatesAutoresizingMaskIntoConstraints="NO" id="ErN-bC-qTx">
                                                                         <rect key="frame" x="0.0" y="0.0" width="60" height="60"/>
@@ -86,7 +88,7 @@
                                                                         </constraints>
                                                                     </imageView>
                                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Food &amp; Drinks" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="nx2-fW-xAm">
-                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.5"/>
+                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.333333333333329"/>
                                                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
                                                                         <nil key="textColor"/>
                                                                         <nil key="highlightedColor"/>
@@ -94,7 +96,7 @@
                                                                 </subviews>
                                                             </stackView>
                                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="6" translatesAutoresizingMaskIntoConstraints="NO" id="0vd-sD-XKv">
-                                                                <rect key="frame" x="164" y="0.0" width="60" height="97.5"/>
+                                                                <rect key="frame" x="95" y="0.0" width="60" height="97.333333333333329"/>
                                                                 <subviews>
                                                                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="shopping" translatesAutoresizingMaskIntoConstraints="NO" id="xcm-St-HAo">
                                                                         <rect key="frame" x="0.0" y="0.0" width="60" height="60"/>
@@ -104,7 +106,7 @@
                                                                         </constraints>
                                                                     </imageView>
                                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" verticalCompressionResistancePriority="1000" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="H7q-q2-ga5">
-                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.5"/>
+                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.333333333333329"/>
                                                                         <string key="text">Shopping
 </string>
                                                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
@@ -114,7 +116,7 @@
                                                                 </subviews>
                                                             </stackView>
                                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="6" translatesAutoresizingMaskIntoConstraints="NO" id="Jd8-YL-b5s">
-                                                                <rect key="frame" x="328" y="0.0" width="60" height="97.5"/>
+                                                                <rect key="frame" x="190" y="0.0" width="60" height="97.333333333333329"/>
                                                                 <subviews>
                                                                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="fun" translatesAutoresizingMaskIntoConstraints="NO" id="bMJ-Jn-Gi8">
                                                                         <rect key="frame" x="0.0" y="0.0" width="60" height="60"/>
@@ -124,7 +126,7 @@
                                                                         </constraints>
                                                                     </imageView>
                                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="kKh-45-FZ2">
-                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.5"/>
+                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.333333333333329"/>
                                                                         <string key="text">Fun
 </string>
                                                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
@@ -134,7 +136,7 @@
                                                                 </subviews>
                                                             </stackView>
                                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="6" translatesAutoresizingMaskIntoConstraints="NO" id="dTL-e1-Arz">
-                                                                <rect key="frame" x="492" y="0.0" width="60" height="97.5"/>
+                                                                <rect key="frame" x="285" y="0.0" width="60" height="97.333333333333329"/>
                                                                 <subviews>
                                                                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="travel" translatesAutoresizingMaskIntoConstraints="NO" id="8h3-fo-pC3">
                                                                         <rect key="frame" x="0.0" y="0.0" width="60" height="60"/>
@@ -144,7 +146,7 @@
                                                                         </constraints>
                                                                     </imageView>
                                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WBT-Vj-7QA">
-                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.5"/>
+                                                                        <rect key="frame" x="0.0" y="66" width="60" height="31.333333333333329"/>
                                                                         <string key="text">Travel
 </string>
                                                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
@@ -166,10 +168,10 @@
                                             </view>
                                             <prototypes>
                                                 <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" selectionStyle="blue" hidesAccessoryWhenEditing="NO" indentationLevel="1" indentationWidth="0.0" reuseIdentifier="Cell" rowHeight="70" id="LzC-B9-Adb" customClass="SearchCell" customModule="Maps" customModuleProvider="target">
-                                                    <rect key="frame" x="0.0" y="160.5" width="600" height="70"/>
+                                                    <rect key="frame" x="0.0" y="166" width="393" height="70"/>
                                                     <autoresizingMask key="autoresizingMask"/>
                                                     <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="LzC-B9-Adb" id="evr-60-laS">
-                                                        <rect key="frame" x="0.0" y="0.0" width="600" height="70"/>
+                                                        <rect key="frame" x="0.0" y="0.0" width="393" height="70"/>
                                                         <autoresizingMask key="autoresizingMask"/>
                                                         <subviews>
                                                             <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="like" translatesAutoresizingMaskIntoConstraints="NO" id="GEk-yE-lLq">
@@ -181,16 +183,16 @@
                                                                 </constraints>
                                                             </imageView>
                                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillEqually" spacing="2" translatesAutoresizingMaskIntoConstraints="NO" id="Gfl-Oy-rsy">
-                                                                <rect key="frame" x="57" y="12" width="528" height="46"/>
+                                                                <rect key="frame" x="57" y="12" width="321" height="46"/>
                                                                 <subviews>
                                                                     <label opaque="NO" userInteractionEnabled="NO" tag="1" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Favorites" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Spf-8L-Ne6">
-                                                                        <rect key="frame" x="0.0" y="0.0" width="528" height="22"/>
+                                                                        <rect key="frame" x="0.0" y="0.0" width="321" height="22"/>
                                                                         <fontDescription key="fontDescription" type="boldSystem" pointSize="20"/>
                                                                         <nil key="textColor"/>
                                                                         <nil key="highlightedColor"/>
                                                                     </label>
                                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="0 Places" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="gyo-3V-7U8">
-                                                                        <rect key="frame" x="0.0" y="24" width="528" height="22"/>
+                                                                        <rect key="frame" x="0.0" y="24" width="321" height="22"/>
                                                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
                                                                         <color key="textColor" red="0.57647058819999997" green="0.57647058819999997" blue="0.57647058819999997" alpha="1" colorSpace="calibratedRGB"/>
                                                                         <nil key="highlightedColor"/>
@@ -255,18 +257,18 @@
             <objects>
                 <viewController storyboardIdentifier="DetailViewController" id="Tp2-MF-IFz" customClass="DetailViewController" customModule="Maps" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="FmO-AT-4Y7">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <visualEffectView opaque="NO" contentMode="scaleToFill" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="c3d-2e-0b1">
-                                <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                                <rect key="frame" x="-1" y="-1" width="393" height="852"/>
                                 <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="9fL-a5-0LS">
-                                    <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                     <subviews>
                                         <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="kP7-56-wlG">
-                                            <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                                             <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                         </tableView>
                                     </subviews>

Examples/Maps/Maps/MainViewController.swift

@@ -156,6 +156,14 @@ class SearchPanelPhoneDelegate: NSObject, FloatingPanelControllerDelegate, UIGes
         self.owner = owner
     }
 
+    func floatingPanel(
+        _ fpc: FloatingPanelController,
+        shouldAllowToScroll scrollView: UIScrollView,
+        in state: FloatingPanelState
+    ) -> Bool {
+        return state == .full || state == .half
+    }
+
     func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
         switch newCollection.verticalSizeClass {
         case .compact:
@@ -210,24 +218,15 @@ class SearchPanelPhoneDelegate: NSObject, FloatingPanelControllerDelegate, UIGes
 class SearchPanelLandscapeLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition  = .bottom
     let initialState: FloatingPanelState = .tip
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
+    ]
     func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
-        if #available(iOS 11.0, *) {
-            return [
-                surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
-                surfaceView.widthAnchor.constraint(equalToConstant: 291),
-            ]
-        } else {
-            return [
-                surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 8.0),
-                surfaceView.widthAnchor.constraint(equalToConstant: 291),
-            ]
-        }
+        return [
+            surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
+            surfaceView.widthAnchor.constraint(equalToConstant: 291),
+        ]
     }
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0
@@ -244,11 +243,9 @@ class DetailPanelPhoneDelegate: NSObject, FloatingPanelControllerDelegate, UIGes
 
 class DetailPanelPhoneLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition  = .bottom
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+    ]
     let initialState: FloatingPanelState = .full
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0
@@ -297,13 +294,11 @@ class SearchPanelPadDelegate: NSObject, FloatingPanelControllerDelegate, UIGestu
 class SearchPanelPadLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition  = .top
     let initialState: FloatingPanelState = .tip
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 80.0, edge: .top, referenceGuide: .superview),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 200.0, edge: .top, referenceGuide: .superview),
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 60.0, edge: .bottom, referenceGuide: .superview),
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 80.0, edge: .top, referenceGuide: .superview),
+        .half: FloatingPanelLayoutAnchor(absoluteInset: 200.0, edge: .top, referenceGuide: .superview),
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 60.0, edge: .bottom, referenceGuide: .superview),
+    ]
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0
     }
@@ -325,7 +320,7 @@ class SearchPaneliPadBehavior: FloatingPanelBehavior {
     var momentumProjectionRate: CGFloat {
         return UIScrollView.DecelerationRate.fast.rawValue
     }
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool {
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedState: FloatingPanelState) -> Bool {
         return true
     }
 }
@@ -357,11 +352,9 @@ class DetailPanelPadDelegate: NSObject, FloatingPanelControllerDelegate, UIGestu
 
 class DetailPanelPadLeftLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition  = .left
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 375, edge: .left, referenceGuide: .superview)
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 375, edge: .left, referenceGuide: .superview)
+    ]
     let initialState: FloatingPanelState = .full
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0
@@ -370,11 +363,9 @@ class DetailPanelPadLeftLayout: FloatingPanelLayout {
 
 class DetailPanelPadRightLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition  = .right
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 375, edge: .right, referenceGuide: .superview)
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 375, edge: .right, referenceGuide: .superview)
+    ]
     let initialState: FloatingPanelState = .full
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0

Examples/Maps/Maps/SearchViewController.swift

@@ -81,9 +81,6 @@ class SearchViewController: UIViewController, UITableViewDataSource {
 
     var items: [LocationItem] = []
 
-    // For iOS 10 only
-    private lazy var shadowLayer: CAShapeLayer = CAShapeLayer()
-
     override func viewDidLoad() {
         super.viewDidLoad()
         tableView.dataSource = self
@@ -92,29 +89,6 @@ class SearchViewController: UIViewController, UITableViewDataSource {
         hideHeader(animated: false)
     }
 
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        if #available(iOS 11, *) {
-        } else {
-            // Exmaple: Add rounding corners on iOS 10
-            visualEffectView.layer.cornerRadius = 9.0
-            visualEffectView.clipsToBounds = true
-
-            // Exmaple: Add shadow manually on iOS 10
-            view.layer.insertSublayer(shadowLayer, at: 0)
-            let rect = visualEffectView.frame
-            let path = UIBezierPath(roundedRect: rect,
-                                    byRoundingCorners: [.topLeft, .topRight],
-                                    cornerRadii: CGSize(width: 9.0, height: 9.0))
-            shadowLayer.frame = visualEffectView.frame
-            shadowLayer.shadowPath = path.cgPath
-            shadowLayer.shadowColor = UIColor.black.cgColor
-            shadowLayer.shadowOffset = CGSize(width: 0.0, height: 1.0)
-            shadowLayer.shadowOpacity = 0.2
-            shadowLayer.shadowRadius = 3.0
-        }
-    }
-
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
         return items.count
     }
@@ -130,16 +104,16 @@ class SearchViewController: UIViewController, UITableViewDataSource {
     }
 
     func showHeader(animated: Bool) {
-        changeHeader(height: 116.0, aniamted: animated)
+        changeHeader(height: 116.0, animated: animated)
     }
 
     func hideHeader(animated: Bool) {
-        changeHeader(height: 0.0, aniamted: animated)
+        changeHeader(height: 0.0, animated: animated)
     }
 
-    private func changeHeader(height: CGFloat, aniamted: Bool) {
+    private func changeHeader(height: CGFloat, animated: Bool) {
         guard let headerView = tableView.tableHeaderView, headerView.bounds.height != height else { return }
-        if aniamted == false {
+        if animated == false {
             updateHeader(height: height)
             return
         }

Examples/Samples/Samples.xcodeproj/project.pbxproj

@@ -18,40 +18,26 @@
 		5442E24A25FC53C100A26F43 /* DebugTextViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E24925FC53C100A26F43 /* DebugTextViewController.swift */; };
 		5442E25225FC541700A26F43 /* NestedScrollViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E25125FC541700A26F43 /* NestedScrollViewController.swift */; };
 		54496C59263A7E5A0031E0C8 /* UseCaseController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54496C58263A7E5A0031E0C8 /* UseCaseController.swift */; };
+		544BC56826CC918200D0A436 /* TableViewControllerForAdaptiveLayout.swift in Sources */ = {isa = PBXBuildFile; fileRef = 544BC56726CC918200D0A436 /* TableViewControllerForAdaptiveLayout.swift */; };
 		545DB9EE21511E6300CA77B8 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9ED21511E6300CA77B8 /* AppDelegate.swift */; };
 		545DB9F021511E6300CA77B8 /* MainViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9EF21511E6300CA77B8 /* MainViewController.swift */; };
 		545DB9F321511E6300CA77B8 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F121511E6300CA77B8 /* Main.storyboard */; };
 		545DB9F521511E6400CA77B8 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F421511E6400CA77B8 /* Assets.xcassets */; };
 		545DB9F821511E6400CA77B8 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F621511E6400CA77B8 /* LaunchScreen.storyboard */; };
-		545DBA0321511E6400CA77B8 /* SampleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0221511E6400CA77B8 /* SampleTests.swift */; };
-		545DBA0E21511E6400CA77B8 /* SampleUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0D21511E6400CA77B8 /* SampleUITests.swift */; };
 		546341A125C6415100CA0596 /* UseCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341A025C6415100CA0596 /* UseCase.swift */; };
 		546341AC25C6426500CA0596 /* CustomState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341AB25C6426500CA0596 /* CustomState.swift */; };
 		549D23CB233C7779008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; };
 		549D23CC233C7779008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		54B51116216AFE5F0033A6F3 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B51115216AFE5F0033A6F3 /* Extensions.swift */; };
 		54CDC5D8215BBE23007D205C /* SupplementaryViews.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D7215BBE23007D205C /* SupplementaryViews.swift */; };
+		54E58CB72BF8A8D900408EA9 /* CollectionViewControllerForAdaptiveLayout.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E58CB62BF8A8D900408EA9 /* CollectionViewControllerForAdaptiveLayout.swift */; };
 		54EAD35B263A75EB006A36EA /* PanelLayouts.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54EAD35A263A75EB006A36EA /* PanelLayouts.swift */; };
 		54EAD365263A765F006A36EA /* PagePanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54EAD364263A765F006A36EA /* PagePanelController.swift */; };
+		54F185822BF4AD0000916F57 /* DebugListCollectionViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54F185812BF4AD0000916F57 /* DebugListCollectionViewController.swift */; };
+		54F185842BF4B82E00916F57 /* UnavailableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54F185832BF4B82E00916F57 /* UnavailableViewController.swift */; };
+		5D82A6AD28D1843C006A44BA /* libswiftCoreGraphics.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = 5D82A6AC28D18438006A44BA /* libswiftCoreGraphics.tbd */; };
 /* End PBXBuildFile section */
 
-/* Begin PBXContainerItemProxy section */
-		545DB9FF21511E6400CA77B8 /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 545DB9E221511E6300CA77B8 /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 545DB9E921511E6300CA77B8;
-			remoteInfo = FloatingModalSample;
-		};
-		545DBA0A21511E6400CA77B8 /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 545DB9E221511E6300CA77B8 /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 545DB9E921511E6300CA77B8;
-			remoteInfo = FloatingModalSample;
-		};
-/* End PBXContainerItemProxy section */
-
 /* Begin PBXCopyFilesBuildPhase section */
 		549D23CD233C7779008EF4D7 /* Embed Frameworks */ = {
 			isa = PBXCopyFilesBuildPhase;
@@ -78,6 +64,7 @@
 		5442E24925FC53C100A26F43 /* DebugTextViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DebugTextViewController.swift; sourceTree = "<group>"; };
 		5442E25125FC541700A26F43 /* NestedScrollViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NestedScrollViewController.swift; sourceTree = "<group>"; };
 		54496C58263A7E5A0031E0C8 /* UseCaseController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCaseController.swift; sourceTree = "<group>"; };
+		544BC56726CC918200D0A436 /* TableViewControllerForAdaptiveLayout.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TableViewControllerForAdaptiveLayout.swift; sourceTree = "<group>"; };
 		545DB9EA21511E6300CA77B8 /* Samples.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Samples.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		545DB9ED21511E6300CA77B8 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		545DB9EF21511E6300CA77B8 /* MainViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MainViewController.swift; sourceTree = "<group>"; };
@@ -85,19 +72,17 @@
 		545DB9F421511E6400CA77B8 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		545DB9F721511E6400CA77B8 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		545DB9F921511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		545DB9FE21511E6400CA77B8 /* SamplesTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = SamplesTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
-		545DBA0221511E6400CA77B8 /* SampleTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SampleTests.swift; sourceTree = "<group>"; };
-		545DBA0421511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		545DBA0921511E6400CA77B8 /* SamplesUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = SamplesUITests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
-		545DBA0D21511E6400CA77B8 /* SampleUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SampleUITests.swift; sourceTree = "<group>"; };
-		545DBA0F21511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		546341A025C6415100CA0596 /* UseCase.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCase.swift; sourceTree = "<group>"; };
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 				5442E24925FC53C100A26F43 /* DebugTextViewController.swift */,
+				54F185812BF4AD0000916F57 /* DebugListCollectionViewController.swift */,
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 				5442E24325FC538200A26F43 /* InspectorViewController.swift */,
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 				5442E22B25FC521F00A26F43 /* SettingsViewController.swift */,
 				5442E22F25FC525200A26F43 /* TabBarViewController.swift */,
+				54F185832BF4B82E00916F57 /* UnavailableViewController.swift */,
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@@ -211,6 +164,24 @@
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 					"@executable_path/Frameworks",
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+					"$(SDKROOT)/usr/lib/swift",
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 				INFOPLIST_FILE = Sources/Info.plist;
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 					"$(inherited)",
 					"@executable_path/Frameworks",
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+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
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+                                                    <rect key="frame" x="20" y="0.0" width="374" height="43.5"/>
                                                     <autoresizingMask key="autoresizingMask"/>
                                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                     <nil key="textColor"/>
@@ -87,7 +87,7 @@
             <objects>
                 <viewController storyboardIdentifier="SettingsViewController" id="C1X-9Z-TyQ" customClass="SettingsViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="af9-Zr-Ppc">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="197.33000000000001"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="197.5"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="n93-ZL-fmC">
@@ -125,7 +125,7 @@
                                                     <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="js8-Qv-lUC">
                                                         <rect key="frame" x="262" y="0.5" width="51" height="31"/>
                                                         <connections>
-                                                            <action selector="toggleLargeTitle:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="FJS-Ty-mCY"/>
+                                                            <action selector="toggleLargeTitle:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="CxM-wn-r09"/>
                                                         </connections>
                                                     </switch>
                                                 </subviews>
@@ -142,7 +142,7 @@
                                                     <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="s6b-j9-8Kw">
                                                         <rect key="frame" x="262" y="0.5" width="51" height="31"/>
                                                         <connections>
-                                                            <action selector="toggleTranslucent:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="nL4-3L-9hh"/>
+                                                            <action selector="toggleTranslucent:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="w7r-AV-RqX"/>
                                                         </connections>
                                                     </switch>
                                                 </subviews>
@@ -163,8 +163,8 @@
                     </view>
                     <size key="freeformSize" width="375" height="197.33000000000001"/>
                     <connections>
-                        <outlet property="largeTitlesSwicth" destination="js8-Qv-lUC" id="FOm-6k-ffi"/>
-                        <outlet property="translucentSwicth" destination="s6b-j9-8Kw" id="jmf-WH-bzZ"/>
+                        <outlet property="largeTitlesSwitch" destination="js8-Qv-lUC" id="szl-pU-uRE"/>
+                        <outlet property="translucentSwitch" destination="s6b-j9-8Kw" id="8yK-Du-jkM"/>
                         <outlet property="versionLabel" destination="WmC-Tq-NDN" id="Woh-kK-U0m"/>
                     </connections>
                 </viewController>
@@ -177,11 +177,11 @@
             <objects>
                 <viewController id="RpE-lI-27a" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="JER-jz-KSq">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IvG-yp-yzI">
-                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
+                                <rect key="frame" x="20" y="48" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="RpE-lI-27a" eventType="touchUpInside" id="hj3-Xv-6Gq"/>
@@ -208,11 +208,11 @@
             <objects>
                 <viewController id="pOk-Zm-vD9" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="85d-ub-G8k">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="NbG-e8-HdI">
-                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
+                                <rect key="frame" x="20" y="48" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="pOk-Zm-vD9" eventType="touchUpInside" id="111-PD-Pop"/>
@@ -239,11 +239,11 @@
             <objects>
                 <viewController id="lto-Zc-Vtp" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="ji9-Ez-N7i">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eFN-tN-4Ct">
-                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
+                                <rect key="frame" x="20" y="48" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="YL4-GP-ZEZ"/>
@@ -383,11 +383,11 @@
             <objects>
                 <viewController storyboardIdentifier="ModalViewController" id="bYI-y3-Rzb" customClass="ModalViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="qwo-GK-p1U">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="768"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="vut-mK-Y4t" customClass="SafeAreaView" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="0.0" y="758" width="375" height="0.0"/>
+                                <rect key="frame" x="0.0" y="768" width="375" height="0.0"/>
                                 <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                             </view>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sbF-Az-7sy">
@@ -598,11 +598,11 @@
                                 </constraints>
                             </view>
                             <view alpha="0.5" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Kva-Z7-0qY" customClass="OnSafeAreaView" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="744"/>
                                 <color key="backgroundColor" red="0.0078431372550000003" green="0.72156862749999995" blue="0.45882352939999999" alpha="1" colorSpace="calibratedRGB"/>
                             </view>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="noi-1a-5bZ" customClass="CloseButton" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="319" y="0.0" width="44" height="44"/>
+                                <rect key="frame" x="319" y="48" width="44" height="44"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="44" id="0jg-5D-A1F"/>
                                     <constraint firstAttribute="width" constant="44" id="1Cq-PA-wgW"/>
@@ -612,7 +612,7 @@
                                 </connections>
                             </button>
                             <stackView opaque="NO" contentMode="scaleToFill" distribution="fillProportionally" alignment="center" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="qux-uG-4o2">
-                                <rect key="frame" x="8" y="8" width="148" height="31"/>
+                                <rect key="frame" x="8" y="56" width="148" height="31"/>
                                 <subviews>
                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="fitToBounds" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7lq-d3-PKi">
                                         <rect key="frame" x="0.0" y="5.5" width="91" height="20.5"/>
@@ -660,19 +660,19 @@
                         <color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <gestureRecognizers/>
                         <constraints>
-                            <constraint firstItem="noi-1a-5bZ" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" id="EQy-cr-F2Y"/>
+                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="top" secondItem="g7l-kO-y7q" secondAttribute="top" id="A4b-Le-m4I"/>
+                            <constraint firstItem="noi-1a-5bZ" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" priority="750" id="EQy-cr-F2Y"/>
                             <constraint firstItem="tP3-oJ-4EB" firstAttribute="centerX" secondItem="aOK-7l-cA6" secondAttribute="centerX" id="EsD-Vf-dNZ"/>
-                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" id="Fff-HL-4mo"/>
-                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="bottom" secondItem="g7l-kO-y7q" secondAttribute="bottom" id="JOL-wC-w74"/>
+                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="bottom" secondItem="g7l-kO-y7q" secondAttribute="bottom" priority="750" id="JOL-wC-w74"/>
                             <constraint firstItem="8yw-OC-Ubk" firstAttribute="leading" secondItem="aOK-7l-cA6" secondAttribute="leading" id="RiJ-Hb-OOZ"/>
                             <constraint firstItem="8yw-OC-Ubk" firstAttribute="trailing" secondItem="aOK-7l-cA6" secondAttribute="trailing" id="Sof-yL-mwK"/>
-                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="top" secondItem="g7l-kO-y7q" secondAttribute="top" constant="88" id="Zhb-Ss-epe"/>
+                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="top" secondItem="g7l-kO-y7q" secondAttribute="top" priority="750" constant="88" id="Zhb-Ss-epe"/>
                             <constraint firstItem="Kva-Z7-0qY" firstAttribute="trailing" secondItem="aOK-7l-cA6" secondAttribute="trailing" id="kkp-Yo-FQW"/>
                             <constraint firstItem="aOK-7l-cA6" firstAttribute="trailing" secondItem="noi-1a-5bZ" secondAttribute="trailing" constant="12" id="lv9-Nf-HNB"/>
                             <constraint firstItem="qux-uG-4o2" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" constant="8" id="naa-cf-ZIc"/>
                             <constraint firstItem="Kva-Z7-0qY" firstAttribute="leading" secondItem="aOK-7l-cA6" secondAttribute="leading" id="oVC-i1-TwS"/>
-                            <constraint firstItem="aOK-7l-cA6" firstAttribute="bottom" secondItem="Kva-Z7-0qY" secondAttribute="bottom" id="rW2-mF-5DR"/>
-                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="top" relation="greaterThanOrEqual" secondItem="tP3-oJ-4EB" secondAttribute="bottom" constant="88" id="vKQ-h9-uKt"/>
+                            <constraint firstItem="aOK-7l-cA6" firstAttribute="bottom" secondItem="Kva-Z7-0qY" secondAttribute="bottom" priority="750" id="rW2-mF-5DR"/>
+                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="top" relation="greaterThanOrEqual" secondItem="tP3-oJ-4EB" secondAttribute="bottom" priority="750" constant="88" id="vKQ-h9-uKt"/>
                             <constraint firstItem="qux-uG-4o2" firstAttribute="leading" secondItem="g7l-kO-y7q" secondAttribute="leading" constant="8" id="zXb-R9-bMO"/>
                         </constraints>
                         <connections>
@@ -761,14 +761,33 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
                                 <fontDescription key="fontDescription" name="CourierNewPSMT" family="Courier New" pointSize="14"/>
                                 <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
                             </textView>
+                            <stackView opaque="NO" contentMode="scaleToFill" distribution="fillProportionally" alignment="center" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="wUo-kb-NIn">
+                                <rect key="frame" x="159" y="16" width="200" height="31"/>
+                                <subviews>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Expand top margin" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="OC3-od-ldC">
+                                        <rect key="frame" x="0.0" y="5.5" width="143" height="20.5"/>
+                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                        <nil key="textColor"/>
+                                        <nil key="highlightedColor"/>
+                                    </label>
+                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="XFC-sq-pWj">
+                                        <rect key="frame" x="151" y="0.0" width="51" height="31"/>
+                                        <connections>
+                                            <action selector="toggleTopMargin:" destination="tvD-nO-QUb" eventType="valueChanged" id="XWo-eX-0Jn"/>
+                                        </connections>
+                                    </switch>
+                                </subviews>
+                            </stackView>
                         </subviews>
                         <viewLayoutGuide key="safeArea" id="5ET-zC-lCb"/>
                         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         <constraints>
                             <constraint firstItem="rN1-HL-YHv" firstAttribute="leading" secondItem="5ET-zC-lCb" secondAttribute="leading" id="7V3-KL-vXd"/>
+                            <constraint firstItem="5ET-zC-lCb" firstAttribute="trailing" secondItem="wUo-kb-NIn" secondAttribute="trailing" constant="16" id="CtG-H5-tAI"/>
                             <constraint firstAttribute="bottom" secondItem="rN1-HL-YHv" secondAttribute="bottom" id="efD-U5-Tet"/>
                             <constraint firstItem="rN1-HL-YHv" firstAttribute="top" secondItem="9YG-0j-Zzg" secondAttribute="top" constant="17" id="fiO-LL-nSC"/>
                             <constraint firstItem="rN1-HL-YHv" firstAttribute="trailing" secondItem="5ET-zC-lCb" secondAttribute="trailing" id="lfg-EE-euw"/>
+                            <constraint firstItem="wUo-kb-NIn" firstAttribute="top" secondItem="9YG-0j-Zzg" secondAttribute="top" constant="16" id="ogC-1W-upw"/>
                         </constraints>
                     </view>
                     <size key="freeformSize" width="375" height="778"/>
@@ -780,9 +799,59 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="x1h-y1-h8q" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-1" y="734"/>
+            <point key="canvasLocation" x="-2.1739130434782612" y="733.92857142857144"/>
+        </scene>
+        <!--Table View Controller For Adaptive Layout-->
+        <scene sceneID="rDI-lU-wEx">
+            <objects>
+                <viewController storyboardIdentifier="TableViewControllerForAdaptiveLayout" id="5nC-6E-bXf" customClass="TableViewControllerForAdaptiveLayout" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="jXL-Ss-NCJ">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="W7W-ET-Wco" customClass="IntrinsicTableView" customModule="Samples" customModuleProvider="target">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                                <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                                <prototypes>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" restorationIdentifier="Cell" insetsLayoutMarginsFromSafeArea="NO" selectionStyle="blue" hidesAccessoryWhenEditing="NO" indentationLevel="1" indentationWidth="0.0" id="Mqi-zK-WA7">
+                                        <rect key="frame" x="0.0" y="50" width="375" height="43.5"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="Mqi-zK-WA7" id="X46-Fp-6Hr">
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="43.5"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                        </tableViewCellContentView>
+                                    </tableViewCell>
+                                </prototypes>
+                                <connections>
+                                    <outlet property="dataSource" destination="5nC-6E-bXf" id="RHg-aY-HNW"/>
+                                    <outlet property="delegate" destination="5nC-6E-bXf" id="0YX-fh-bB8"/>
+                                </connections>
+                            </tableView>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="ZfG-sd-dcQ"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                        <constraints>
+                            <constraint firstItem="W7W-ET-Wco" firstAttribute="trailing" secondItem="ZfG-sd-dcQ" secondAttribute="trailing" id="3kP-rg-7c6"/>
+                            <constraint firstAttribute="bottom" secondItem="W7W-ET-Wco" secondAttribute="bottom" id="FdS-X9-D1D"/>
+                            <constraint firstItem="W7W-ET-Wco" firstAttribute="leading" secondItem="ZfG-sd-dcQ" secondAttribute="leading" id="HXa-oO-jag"/>
+                            <constraint firstItem="W7W-ET-Wco" firstAttribute="top" secondItem="jXL-Ss-NCJ" secondAttribute="top" id="gMX-Wq-7G8"/>
+                        </constraints>
+                    </view>
+                    <size key="freeformSize" width="375" height="778"/>
+                    <connections>
+                        <outlet property="tableView" destination="W7W-ET-Wco" id="N54-Fv-2Jq"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="7hJ-XW-9az" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="4005" y="734"/>
         </scene>
     </scenes>
+    <designables>
+        <designable name="noi-1a-5bZ">
+            <size key="intrinsicContentSize" width="30" height="30"/>
+        </designable>
+    </designables>
     <inferredMetricsTieBreakers>
         <segue reference="r1P-2i-NDe"/>
     </inferredMetricsTieBreakers>
@@ -792,13 +861,13 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
             <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
         </systemColor>
         <systemColor name="systemOrangeColor">
-            <color red="1" green="0.58431372549019611" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="1" green="0.58431372550000005" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
         <systemColor name="systemPurpleColor">
-            <color red="0.68627450980392157" green="0.32156862745098042" blue="0.87058823529411766" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="0.68627450980000004" green="0.32156862749999998" blue="0.87058823529999996" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
         <systemColor name="systemTealColor">
-            <color red="0.18823529411764706" green="0.69019607843137254" blue="0.7803921568627451" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="0.18823529410000001" green="0.69019607839999997" blue="0.78039215689999997" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
     </resources>
 </document>

Examples/Samples/Sources/ContentViewControllers/AdaptiveLayout/CollectionViewControllerForAdaptiveLayout.swift

@@ -0,0 +1,175 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+@available(iOS 13.0, *)
+class CollectionViewControllerForAdaptiveLayout: UIViewController {
+    class PanelLayout: FloatingPanelLayout {
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .full
+
+        private unowned var targetGuide: UILayoutGuide
+
+        init(targetGuide: UILayoutGuide) {
+            self.targetGuide = targetGuide
+        }
+
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            return [
+                .full: FloatingPanelAdaptiveLayoutAnchor(
+                    absoluteOffset: 0.0,
+                    contentLayout: targetGuide,
+                    referenceGuide: .superview,
+                    contentBoundingGuide: .safeArea
+                ),
+                .half: FloatingPanelAdaptiveLayoutAnchor(
+                    fractionalOffset: 0.5,
+                    contentLayout: targetGuide,
+                    referenceGuide: .superview,
+                    contentBoundingGuide: .safeArea
+                ),
+            ]
+        }
+    }
+
+    enum LayoutType {
+        case flow
+        case compositional
+    }
+
+    weak var collectionView: UICollectionView!
+    var layoutType: LayoutType = .flow
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        setupCollectionView()
+    }
+
+    private func setupCollectionView() {
+        let collectionViewLayout = {
+            switch layoutType {
+            case .flow:
+                CollectionViewLayoutFactory.flowLayout
+            case .compositional:
+                CollectionViewLayoutFactory.compositionalLayout
+            }
+        }()
+        let collectionView = IntrinsicCollectionView(
+            frame: .zero,
+            collectionViewLayout: collectionViewLayout
+        )
+
+        collectionView.delegate = self
+        collectionView.dataSource = self
+        collectionView.backgroundColor = .yellow
+        collectionView.register(Cell.self, forCellWithReuseIdentifier: Cell.reuseIdentifier)
+
+        view.addSubview(collectionView)
+        self.collectionView = collectionView
+
+        collectionView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            collectionView.topAnchor.constraint(equalTo: view.topAnchor),
+            collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
+        ])
+    }
+}
+
+@available(iOS 13.0, *)
+extension CollectionViewControllerForAdaptiveLayout: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
+        return 5  // Only three cells needed to fill the space
+    }
+
+    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell.reuseIdentifier, for: indexPath) as! Cell
+        cell.configure(text: "Item \(indexPath.row)")
+        return cell
+    }
+
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        let width = collectionView.frame.width  
+        return CGSize(width: width, height: 100)
+    }
+}
+
+@available(iOS 13.0, *)
+extension CollectionViewControllerForAdaptiveLayout {
+    enum CollectionViewLayoutFactory {
+        static var flowLayout: UICollectionViewLayout {
+            let layout = UICollectionViewFlowLayout()
+            layout.scrollDirection = .vertical
+            layout.minimumLineSpacing = 8  // Vertical spacing between rows
+            return layout
+        }
+
+        @available(iOS 13.0, *)
+        static var compositionalLayout: UICollectionViewLayout {
+            UICollectionViewCompositionalLayout { (sectionIndex: Int, layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in
+                let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(100))
+                let item = NSCollectionLayoutItem(layoutSize: itemSize)
+
+                let group = NSCollectionLayoutGroup.horizontal(layoutSize: itemSize, subitems: [item])
+
+                let section = NSCollectionLayoutSection(group: group)
+                section.interGroupSpacing = 8 // Spacing between each group/item
+                section.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 0, bottom: 0, trailing: 0)
+
+                return section
+            }
+        }
+    }
+
+
+    private final class Cell: UICollectionViewCell {
+        static let reuseIdentifier = "Cell"
+
+        private let label: UILabel = {
+            let label = UILabel()
+            label.textAlignment = .center
+            label.textColor = .white
+            return label
+        }()
+
+        override init(frame: CGRect) {
+            super.init(frame: frame)
+            commonInit()
+        }
+
+        required init?(coder: NSCoder) {
+            super.init(coder: coder)
+            commonInit()
+        }
+
+        private func commonInit() {
+            backgroundColor = .systemBlue
+            addSubview(label)
+            label.translatesAutoresizingMaskIntoConstraints = false
+            NSLayoutConstraint.activate([
+                label.centerXAnchor.constraint(equalTo: centerXAnchor),
+                label.centerYAnchor.constraint(equalTo: centerYAnchor)
+            ])
+        }
+
+        func configure(text: String) {
+            label.text = text
+        }
+    }
+
+    private final class IntrinsicCollectionView: UICollectionView {
+        override public var contentSize: CGSize {
+            didSet {
+                invalidateIntrinsicContentSize()
+            }
+        }
+
+        override public var intrinsicContentSize: CGSize {
+            layoutIfNeeded()
+            return CGSize(width: UIView.noIntrinsicMetric, height: contentSize.height)
+        }
+    }
+}

Examples/Samples/Sources/ContentViewControllers/AdaptiveLayout/ImageViewController.swift

@@ -5,29 +5,25 @@ import FloatingPanel
 
 final class ImageViewController: UIViewController {
     class PanelLayout: FloatingPanelLayout {
-        weak var targetGuide: UILayoutGuide?
-        init(targetGuide: UILayoutGuide?) {
+        private unowned var targetGuide: UILayoutGuide
+        init(targetGuide: UILayoutGuide) {
             self.targetGuide = targetGuide
         }
         let position: FloatingPanelPosition = .bottom
         let initialState: FloatingPanelState = .full
         var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-            if #available(iOS 11.0, *), let targetGuide = targetGuide {
-                return [
-                    .full: FloatingPanelAdaptiveLayoutAnchor(absoluteOffset: 0,
-                                                             contentLayout: targetGuide,
-                                                             referenceGuide: .superview),
-                    .half: FloatingPanelAdaptiveLayoutAnchor(fractionalOffset: 0.5,
-                                                             contentLayout: targetGuide,
-                                                             referenceGuide: .superview)
-                ]
-            } else {
-                return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 500,
-                                                     edge: .bottom,
-                                                     referenceGuide: .superview)
-                ]
-            }
+            return [
+                .full: FloatingPanelAdaptiveLayoutAnchor(
+                    absoluteOffset: 0,
+                    contentLayout: targetGuide,
+                    referenceGuide: .superview
+                ),
+                .half: FloatingPanelAdaptiveLayoutAnchor(
+                    fractionalOffset: 0.5,
+                    contentLayout: targetGuide,
+                    referenceGuide: .superview
+                )
+            ]
         }
     }
 
@@ -41,7 +37,6 @@ final class ImageViewController: UIViewController {
         case withHeaderFooter
     }
 
-    @available(iOS 11.0, *)
     func layoutGuideFor(mode: Mode) -> UILayoutGuide {
         switch mode {
         case .onlyImage:

Examples/Samples/Sources/ContentViewControllers/AdaptiveLayout/TableViewControllerForAdaptiveLayout.swift

@@ -0,0 +1,88 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class TableViewControllerForAdaptiveLayout: UIViewController, UITableViewDataSource, UITableViewDelegate {
+    class PanelLayout: FloatingPanelLayout {
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .full
+
+        private unowned var targetGuide: UILayoutGuide
+
+        init(targetGuide: UILayoutGuide) {
+            self.targetGuide = targetGuide
+        }
+
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            return [
+                .full: FloatingPanelAdaptiveLayoutAnchor(
+                    absoluteOffset: 0.0,
+                    contentLayout: targetGuide,
+                    referenceGuide: .superview,
+                    contentBoundingGuide: .safeArea
+                ),
+                .half: FloatingPanelAdaptiveLayoutAnchor(
+                    fractionalOffset: 0.5,
+                    contentLayout: targetGuide,
+                    referenceGuide: .superview,
+                    contentBoundingGuide: .safeArea
+                ),
+            ]
+        }
+    }
+
+    @IBOutlet weak var tableView: IntrinsicTableView!
+    private let cellID = "Cell"
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellID)
+    }
+
+    // MARK: - UITableViewDataSource
+
+    func numberOfSections(in tableView: UITableView) -> Int {
+        1
+    }
+
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        50
+    }
+
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath)
+        cell.textLabel?.text = "\(indexPath.row)"
+        return cell
+    }
+
+    // MARK: - UITableViewDelegate
+
+    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
+        let headerView = UIView()
+        headerView.backgroundColor = .orange
+        return headerView
+    }
+
+    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
+        44.0
+    }
+
+    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
+        40
+    }
+}
+
+class IntrinsicTableView: UITableView {
+    override var contentSize:CGSize {
+        didSet {
+            invalidateIntrinsicContentSize()
+        }
+    }
+
+    override var intrinsicContentSize: CGSize {
+        layoutIfNeeded()
+        return CGSize(width: UIView.noIntrinsicMetric, height: contentSize.height)
+    }
+}

Examples/Samples/Sources/ContentViewControllers/DebugListCollectionViewController.swift

@@ -0,0 +1,77 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+@available(iOS 14, *)
+class DebugListCollectionViewController: UIViewController {
+
+    enum Section {
+        case main
+    }
+
+    var dataSource: UICollectionViewDiffableDataSource<Section, Int>! = nil
+    var collectionView: UICollectionView! = nil
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        navigationItem.title = "List"
+        configureHierarchy()
+        configureDataSource()
+    }
+}
+
+@available(iOS 14, *)
+extension DebugListCollectionViewController {
+    /// - Tag: List
+    private func createLayout() -> UICollectionViewLayout {
+        var config = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
+        config.trailingSwipeActionsConfigurationProvider =  { indexPath -> UISwipeActionsConfiguration? in
+            return UISwipeActionsConfiguration(
+                actions: [UIContextualAction(
+                    style: .destructive,
+                    title: "Delete",
+                    handler: { _, _, completion in
+                        // Do nothing now
+                    }
+                )]
+            )
+        }
+        return UICollectionViewCompositionalLayout.list(using: config)
+    }
+}
+
+@available(iOS 14, *)
+extension DebugListCollectionViewController {
+    private func configureHierarchy() {
+        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: createLayout())
+        collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        view.addSubview(collectionView)
+        collectionView.delegate = self
+    }
+    private func configureDataSource() {
+
+        let cellRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, Int> { (cell, indexPath, item) in
+            var content = cell.defaultContentConfiguration()
+            content.text = "\(item)"
+            cell.contentConfiguration = content
+        }
+
+        dataSource = UICollectionViewDiffableDataSource<Section, Int>(collectionView: collectionView) {
+            (collectionView: UICollectionView, indexPath: IndexPath, identifier: Int) -> UICollectionViewCell? in
+
+            return collectionView.dequeueConfiguredReusableCell(using: cellRegistration, for: indexPath, item: identifier)
+        }
+
+        var snapshot = NSDiffableDataSourceSnapshot<Section, Int>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(Array(0..<94))
+        dataSource.apply(snapshot, animatingDifferences: false)
+    }
+}
+
+@available(iOS 14, *)
+extension DebugListCollectionViewController: UICollectionViewDelegate {
+    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+        collectionView.deselectItem(at: indexPath, animated: true)
+    }
+}

Examples/Samples/Sources/ContentViewControllers/DebugTableViewController.swift

@@ -18,7 +18,7 @@ class DebugTableViewController: InspectableViewController {
         stackView.axis = .vertical
         stackView.distribution = .fillEqually
         stackView.alignment = .trailing
-        stackView.spacing = 10.0
+        stackView.spacing = 4
         return stackView
     }()
     private lazy var reorderButton: UIButton = {
@@ -28,40 +28,48 @@ class DebugTableViewController: InspectableViewController {
         button.addTarget(self, action: #selector(reorderItems), for: .touchUpInside)
         return button
     }()
-    private lazy var trackingSwitchWrapper: UIStackView = {
-        let stackView = UIStackView()
-        stackView.axis = .horizontal
-        stackView.distribution = .fillProportionally
-        stackView.alignment = .center
-        stackView.spacing = 8.0
-        stackView.addArrangedSubview(trackingLabel)
-        stackView.addArrangedSubview(trackingSwitch)
-        return stackView
+    private lazy var trackingButton: UIButton = {
+        let button = UIButton()
+        button.setTitle(Menu.trackScrolling.rawValue, for: .normal)
+        button.setTitleColor(view.tintColor, for: .normal)
+        button.addTarget(self, action: #selector(toggleTrackingScroll), for: .touchUpInside)
+        return button
     }()
-    private lazy var trackingLabel: UILabel = {
-        let label = UILabel()
-        label.text = "Tracking"
-        label.font = UIFont.systemFont(ofSize: 17.0, weight: .regular)
-        return label
-    }()
-    private lazy var trackingSwitch: UISwitch = {
-        let trackingSwitch = UISwitch()
-        trackingSwitch.isOn = true
-        trackingSwitch.addTarget(self, action: #selector(turnTrackingOn), for: .touchUpInside)
-        return trackingSwitch
+    private lazy var followingButton: UIButton = {
+        let button = UIButton()
+        button.setTitleColor(view.tintColor, for: .normal)
+        button.addTarget(self, action: #selector(toggleFollowingScroll), for: .touchUpInside)
+        return button
     }()
 
     // MARK: - Properties
 
     var kvoObservers: [NSKeyValueObservation] = []
+
+    private var fpc: FloatingPanelController? { parent as? FloatingPanelController }
     private lazy var items: [String] = {
         let items = (0..<100).map { "Items \($0)" }
         return Command.replace(items: items)
     }()
     private var itemHeight: CGFloat = 66.0
 
+    // MARK: Flags
+    private var tracksScrollView: Bool = false {
+        didSet {
+            let title = "\(Menu.trackScrolling.rawValue): \(tracksScrollView ? "on" : "off")"
+            trackingButton.setTitle(title, for: .normal)
+        }
+    }
+    private var followsScrollViewBouncing: Bool = false {
+        didSet {
+            let title = "\(Menu.followScrolling.rawValue): \(followsScrollViewBouncing ? "on" : "off")"
+            followingButton.setTitle(title, for: .normal)
+        }
+    }
+
     enum Menu: String, CaseIterable {
-        case turnOffTracking = "Tracking"
+        case trackScrolling = "Tracking"
+        case followScrolling = "Following"
         case reorder = "Reorder"
     }
 
@@ -136,13 +144,19 @@ class DebugTableViewController: InspectableViewController {
             switch menu {
             case .reorder:
                 buttonStackView.addArrangedSubview(reorderButton)
-            case .turnOffTracking:
-                buttonStackView.addArrangedSubview(trackingSwitchWrapper)
+            case .trackScrolling:
+                buttonStackView.addArrangedSubview(trackingButton)
+            case .followScrolling:
+                buttonStackView.addArrangedSubview(followingButton)
             }
         }
+        // Set titles
+        tracksScrollView = true
+        followsScrollViewBouncing = false
     }
 
     // MARK: - Menu
+
     @objc
     private func reorderItems() {
         if reorderButton.titleLabel?.text == Menu.reorder.rawValue {
@@ -155,15 +169,21 @@ class DebugTableViewController: InspectableViewController {
     }
 
     @objc
-    private func turnTrackingOn(_ sender: UISwitch) {
-        guard let fpc = self.parent as? FloatingPanelController else { return }
-        if sender.isOn {
+    private func toggleTrackingScroll() {
+        tracksScrollView.toggle()
+        guard let fpc = fpc else { return }
+        if tracksScrollView {
             fpc.track(scrollView: tableView)
         } else {
             fpc.untrack(scrollView: tableView)
         }
     }
 
+    @objc
+    private func toggleFollowingScroll() {
+        followsScrollViewBouncing.toggle()
+    }
+
     // MARK: - Actions
 
     private func execute(command: Command, sourceView: UIView) {
@@ -250,6 +270,9 @@ extension DebugTableViewController: UITableViewDataSource {
 
 extension DebugTableViewController: UITableViewDelegate {
     func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        if followsScrollViewBouncing {
+            fpc?.followScrollViewBouncing()
+        }
         print("TableView --- ", scrollView.contentOffset, scrollView.contentInset)
     }
 

Examples/Samples/Sources/ContentViewControllers/DebugTextViewController.swift

@@ -11,9 +11,7 @@ final class DebugTextViewController: UIViewController, UITextViewDelegate {
         textView.delegate = self
         print("viewDidLoad: TextView --- ", textView.contentOffset, textView.contentInset)
 
-        if #available(iOS 11.0, *) {
-            textView.contentInsetAdjustmentBehavior = .never
-        }
+        textView.contentInsetAdjustmentBehavior = .never
     }
 
     override func viewWillLayoutSubviews() {
@@ -32,8 +30,14 @@ final class DebugTextViewController: UIViewController, UITextViewDelegate {
 
     func scrollViewDidScroll(_ scrollView: UIScrollView) {
         print("TextView --- ", scrollView.contentOffset, scrollView.contentInset)
-        if #available(iOS 11.0, *) {
-            print("TextView --- ", scrollView.adjustedContentInset)
+        print("TextView --- ", scrollView.adjustedContentInset)
+    }
+
+    @IBAction func toggleTopMargin(_ sender: UISwitch) {
+        if sender.isOn {
+            textViewTopConstraint.constant = 160
+        } else {
+            textViewTopConstraint.constant = 16
         }
     }
 

Examples/Samples/Sources/ContentViewControllers/ModalViewController.swift

@@ -65,14 +65,12 @@ final class ModalViewController: UIViewController, FloatingPanelControllerDelega
     }
 
     class ModalSecondLayout: FloatingPanelLayout {
-        var position: FloatingPanelPosition = .bottom
-        var initialState: FloatingPanelState { .half }
-        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-            return [
-                .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
-                .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea),
-                .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
-            ]
-        }
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .half
+        let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
     }
 }

Examples/Samples/Sources/ContentViewControllers/MultiPanelController.swift

@@ -57,11 +57,9 @@ final class MultiPanelController: FloatingPanelController, FloatingPanelControll
     private final class FirstViewLayout: FloatingPanelLayout {
         let position: FloatingPanelPosition = .bottom
         let initialState: FloatingPanelState = .full
-        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-            return [
-                .full: FloatingPanelLayoutAnchor(absoluteInset: 40.0, edge: .top, referenceGuide: .superview)
-            ]
-        }
+        let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 40.0, edge: .top, referenceGuide: .superview)
+        ]
     }
 }
 

Examples/Samples/Sources/ContentViewControllers/SettingsViewController.swift

@@ -4,8 +4,8 @@ import UIKit
 import FloatingPanel
 
 final class SettingsViewController: InspectableViewController {
-    @IBOutlet weak var largeTitlesSwicth: UISwitch!
-    @IBOutlet weak var translucentSwicth: UISwitch!
+    @IBOutlet weak var largeTitlesSwitch: UISwitch!
+    @IBOutlet weak var translucentSwitch: UISwitch!
     @IBOutlet weak var versionLabel: UILabel!
 
     override func viewDidLoad() {
@@ -14,23 +14,31 @@ final class SettingsViewController: InspectableViewController {
 
     override func viewDidLayoutSubviews() {
         super.viewDidLayoutSubviews()
-        if #available(iOS 11.0, *) {
-            let prefersLargeTitles = navigationController!.navigationBar.prefersLargeTitles
-            largeTitlesSwicth.setOn(prefersLargeTitles, animated: false)
-        } else {
-            largeTitlesSwicth.isEnabled = false
-        }
+        let prefersLargeTitles = navigationController!.navigationBar.prefersLargeTitles
+        largeTitlesSwitch.setOn(prefersLargeTitles, animated: false)
+
         let isTranslucent = navigationController!.navigationBar.isTranslucent
-        translucentSwicth.setOn(isTranslucent, animated: false)
+        translucentSwitch.setOn(isTranslucent, animated: false)
     }
 
     @IBAction func toggleLargeTitle(_ sender: UISwitch) {
-        if #available(iOS 11.0, *) {
-            navigationController?.navigationBar.prefersLargeTitles = sender.isOn
-        }
+        navigationController?.navigationBar.prefersLargeTitles = sender.isOn
     }
+
     @IBAction func toggleTranslucent(_ sender: UISwitch) {
-        navigationController?.navigationBar.isTranslucent = sender.isOn
+        // White non-translucent navigation bar, supports dark appearance
+        if #available(iOS 15, *) {
+            let appearance = UINavigationBarAppearance()
+            if sender.isOn {
+                appearance.configureWithTransparentBackground()
+            } else {
+                appearance.configureWithOpaqueBackground()
+            }
+            navigationController?.navigationBar.standardAppearance = appearance
+            navigationController?.navigationBar.scrollEdgeAppearance = appearance
+        } else {
+            navigationController?.navigationBar.isTranslucent = sender.isOn
+        }
     }
 }
 

Examples/Samples/Sources/ContentViewControllers/TabBarViewController.swift

@@ -195,14 +195,12 @@ class OneTabBarPanelLayout: FloatingPanelLayout {
 }
 
 class TwoTabBarPanelLayout: FloatingPanelLayout {
-    var initialState: FloatingPanelState { .half }
-    var position: FloatingPanelPosition { .bottom }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
+    let initialState: FloatingPanelState = .half
+    let position: FloatingPanelPosition = .bottom
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
+        .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0, edge: .bottom, referenceGuide: .safeArea)
+    ]
 }
 
 class TwoTabBarPanelBehavior: FloatingPanelBehavior {
@@ -240,13 +238,8 @@ class ThreeTabBarPanelLayout: FloatingPanelLayout {
     }
 
     func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
-        if #available(iOS 11.0, *) {
-            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0)
-            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0)
-        } else {
-            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0)
-            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0)
-        }
+        leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0)
+        rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0)
         return [ leftConstraint, rightConstraint ]
     }
 }

Examples/Samples/Sources/ContentViewControllers/UnavailableViewController.swift

@@ -0,0 +1,24 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+class UnavailableViewController: UIViewController {
+    weak var label: UILabel!
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        let label = UILabel()
+        label.text = "Unavailable content"
+        label.numberOfLines = 0
+        label.textAlignment = .center
+        label.frame = view.bounds
+        label.autoresizingMask = [
+            .flexibleTopMargin,
+            .flexibleLeftMargin,
+            .flexibleBottomMargin,
+            .flexibleRightMargin
+        ]
+        view.addSubview(label)
+        self.label = label
+    }
+}

Examples/Samples/Sources/Extensions.swift

@@ -2,6 +2,20 @@
 
 import UIKit
 
+extension UIView {
+    func makeBoundsLayoutGuide() -> UILayoutGuide {
+        let guide = UILayoutGuide()
+        addLayoutGuide(guide)
+        NSLayoutConstraint.activate([
+            guide.topAnchor.constraint(equalTo: topAnchor),
+            guide.leftAnchor.constraint(equalTo: leftAnchor),
+            guide.bottomAnchor.constraint(equalTo: bottomAnchor),
+            guide.rightAnchor.constraint(equalTo: rightAnchor),
+        ])
+        return guide
+    }
+}
+
 protocol LayoutGuideProvider {
     var topAnchor: NSLayoutYAxisAnchor { get }
     var bottomAnchor: NSLayoutYAxisAnchor { get }
@@ -19,22 +33,10 @@ class CustomLayoutGuide: LayoutGuideProvider {
 
 extension UIViewController {
     var layoutInsets: UIEdgeInsets {
-        if #available(iOS 11.0, *) {
-            return view.safeAreaInsets
-        } else {
-            return UIEdgeInsets(top: topLayoutGuide.length,
-                                left: 0.0,
-                                bottom: bottomLayoutGuide.length,
-                                right: 0.0)
-        }
+        return view.safeAreaInsets
     }
 
     var layoutGuide: LayoutGuideProvider {
-        if #available(iOS 11.0, *) {
-            return view!.safeAreaLayoutGuide
-        } else {
-            return CustomLayoutGuide(topAnchor: topLayoutGuide.bottomAnchor,
-                                     bottomAnchor: bottomLayoutGuide.topAnchor)
-        }
+        return view.safeAreaLayoutGuide
     }
 }

Examples/Samples/Sources/MainViewController.swift

@@ -15,14 +15,11 @@ extension MainViewController {
         tableView.dataSource = self
         tableView.delegate = self
         tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
-        automaticallyAdjustsScrollViewInsets = false
 
         let searchController = UISearchController(searchResultsController: nil)
-        if #available(iOS 11.0, *) {
-            navigationItem.searchController = searchController
-            navigationItem.hidesSearchBarWhenScrolling = false
-            navigationItem.largeTitleDisplayMode = .automatic
-        }
+        navigationItem.searchController = searchController
+        navigationItem.hidesSearchBarWhenScrolling = false
+        navigationItem.largeTitleDisplayMode = .automatic
         var insets = UIEdgeInsets.zero
         insets.bottom += 69.0
         tableView.contentInset = insets
@@ -33,12 +30,10 @@ extension MainViewController {
 
     override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)
-        if #available(iOS 11.0, *) {
-            if let observation = navigationController?.navigationBar.observe(\.prefersLargeTitles, changeHandler: { (bar, _) in
-                self.tableView.reloadData()
-            }) {
-                observations.append(observation)
-            }
+        if let observation = navigationController?.navigationBar.observe(\.prefersLargeTitles, changeHandler: { (bar, _) in
+            self.tableView.reloadData()
+        }) {
+            observations.append(observation)
         }
     }
 
@@ -56,12 +51,8 @@ extension MainViewController {
 
 extension MainViewController: UITableViewDataSource {
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        if #available(iOS 11.0, *) {
-            if navigationController?.navigationBar.prefersLargeTitles == true {
-                return UseCase.allCases.count + 30
-            } else {
-                return UseCase.allCases.count
-            }
+        if navigationController?.navigationBar.prefersLargeTitles == true {
+            return UseCase.allCases.count + 30
         } else {
             return UseCase.allCases.count
         }

Examples/Samples/Sources/PanelLayouts.swift

@@ -23,14 +23,11 @@ extension MainViewController: FloatingPanelLayout {
 class TopPositionedPanelLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .top
     let initialState: FloatingPanelState = .full
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 88.0, edge: .bottom, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .top, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .top, referenceGuide: .safeArea)
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 88.0, edge: .bottom, referenceGuide: .safeArea),
+        .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .top, referenceGuide: .safeArea),
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .top, referenceGuide: .safeArea)
+    ]
 }
 
 class IntrinsicPanelLayout: FloatingPanelBottomLayout {
@@ -45,13 +42,10 @@ class IntrinsicPanelLayout: FloatingPanelBottomLayout {
 class RemovablePanelLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .half
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
             .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
             .half: FloatingPanelLayoutAnchor(absoluteInset: 130.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
+    ]
 
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.3
@@ -61,13 +55,10 @@ class RemovablePanelLayout: FloatingPanelLayout {
 class RemovablePanelLandscapeLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .full
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+        .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .bottom, referenceGuide: .safeArea)
+    ]
 
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.3
@@ -77,12 +68,9 @@ class RemovablePanelLandscapeLayout: FloatingPanelLayout {
 class ModalPanelLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .full
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
+    ]
 
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.3

Examples/Samples/Sources/UseCases/UseCase.swift

@@ -5,11 +5,13 @@ import UIKit
 enum UseCase: Int, CaseIterable {
     case trackingTableView
     case trackingTextView
+    case trackingCollectionViewList
     case showDetail
     case showModal
     case showPanelModal
     case showMultiPanelModal
     case showPanelInSheetModal
+    case showOnWindow
     case showTabBar
     case showPageView
     case showPageContentView
@@ -21,19 +23,24 @@ enum UseCase: Int, CaseIterable {
     case showNavigationController
     case showTopPositionedPanel
     case showAdaptivePanel
-    case showAdaptivePanelWithCustomGuide
+    case showAdaptivePanelWithTableView
+    case showAdaptivePanelWithCollectionView
+    case showAdaptivePanelWithCompositionalCollectionView
     case showCustomStatePanel
+    case showCustomBackdrop
 }
 
 extension UseCase {
     var name: String {
         switch self {
         case .trackingTableView: return "Scroll tracking(TableView)"
+        case .trackingCollectionViewList: return "Scroll tracking(List CollectionView)"
         case .trackingTextView: return "Scroll tracking(TextView)"
         case .showDetail: return "Show Detail Panel"
         case .showModal: return "Show Modal"
         case .showPanelModal: return "Show Panel Modal"
         case .showMultiPanelModal: return "Show Multi Panel Modal"
+        case .showOnWindow: return "Show Panel over Window"
         case .showPanelInSheetModal: return "Show Panel in Sheet Modal"
         case .showTabBar: return "Show Tab Bar"
         case .showPageView: return "Show Page View"
@@ -46,11 +53,16 @@ extension UseCase {
         case .showNavigationController: return "Show Navigation Controller"
         case .showTopPositionedPanel: return "Show Top Positioned Panel"
         case .showAdaptivePanel: return "Show Adaptive Panel"
-        case .showAdaptivePanelWithCustomGuide: return "Show Adaptive Panel (Custom Layout Guide)"
+        case .showAdaptivePanelWithTableView: return "Show Adaptive Panel (TableView)"
+        case .showAdaptivePanelWithCollectionView: return "Show Adaptive Panel (CollectionView)"
+        case .showAdaptivePanelWithCompositionalCollectionView: return "Show Adaptive Panel (Compositional CollectionView)"
         case .showCustomStatePanel: return "Show Panel with Custom state"
+        case .showCustomBackdrop: return "Show Panel with Custom Backdrop"
         }
     }
+}
 
+extension UseCase {
     private enum Content {
         case storyboard(String)
         case viewController(UIViewController)
@@ -59,10 +71,18 @@ extension UseCase {
     private var content: Content {
         switch self {
         case .trackingTableView: return .viewController(DebugTableViewController())
+        case .trackingCollectionViewList:
+            if #available(iOS 14, *) {
+                return .viewController(DebugListCollectionViewController())
+            } else {
+                let msg = "UICollectionLayoutListConfiguration is unavailable.\nBuild this app on iOS 14 and later."
+                return makeUnavailableViewContent(message: msg)
+            }
         case .trackingTextView: return .storyboard("ConsoleViewController") // Storyboard only
         case .showDetail: return .storyboard(String(describing: DetailViewController.self))
         case .showModal: return .storyboard(String(describing: ModalViewController.self))
         case .showMultiPanelModal: return .viewController(DebugTableViewController())
+        case .showOnWindow: return .viewController(DebugTableViewController())
         case .showPanelInSheetModal: return .viewController(DebugTableViewController())
         case .showPanelModal: return .viewController(DebugTableViewController())
         case .showTabBar: return .storyboard(String(describing: TabBarViewController.self))
@@ -76,8 +96,19 @@ extension UseCase {
         case .showNavigationController: return .storyboard("RootNavigationController") // Storyboard only
         case .showTopPositionedPanel: return .viewController(DebugTableViewController())
         case .showAdaptivePanel: return .storyboard(String(describing: ImageViewController.self))
-        case .showAdaptivePanelWithCustomGuide: return .storyboard(String(describing: ImageViewController.self))
+        case .showAdaptivePanelWithTableView: return .storyboard(String(describing: TableViewControllerForAdaptiveLayout.self))
+        case .showAdaptivePanelWithCollectionView,
+            .showAdaptivePanelWithCompositionalCollectionView:
+            if #available(iOS 13, *) {
+                let vc = CollectionViewControllerForAdaptiveLayout()
+                vc.layoutType = self == .showAdaptivePanelWithCollectionView ? .flow : .compositional
+                return .viewController(vc)
+            } else {
+                let msg = "Compositional layout is unavailable.\nBuild this app on iOS 13 and later."
+                return makeUnavailableViewContent(message: msg)
+            }
         case .showCustomStatePanel: return .viewController(DebugTableViewController())
+        case .showCustomBackdrop: return .viewController(UIViewController())
         }
     }
 
@@ -86,7 +117,15 @@ extension UseCase {
         case .storyboard(let id):
             return storyboard.instantiateViewController(withIdentifier: id)
         case .viewController(let vc):
+            vc.loadViewIfNeeded()
             return vc
         }
     }
+
+    private func makeUnavailableViewContent(message: String) -> Content {
+        let vc = UnavailableViewController()
+        vc.loadViewIfNeeded()
+        vc.label.text = message
+        return .viewController(vc)
+    }
 }

Examples/Samples/Sources/UseCases/UseCaseController.swift

@@ -11,6 +11,7 @@ final class UseCaseController: NSObject {
     private var detailPanelVC: FloatingPanelController!
     private var settingsPanelVC: FloatingPanelController!
     private lazy var pagePanelController = PagePanelController()
+    private lazy var overWindowPanelVC = FloatingPanelController()
 
     init(mainVC: MainViewController) {
         self.mainVC = mainVC
@@ -51,6 +52,30 @@ extension UseCaseController {
             fpc.ext_trackScrollView(in: contentVC)
             addMain(panel: fpc)
 
+         case .trackingCollectionViewList:
+            let fpc = FloatingPanelController()
+            fpc.delegate = self
+            fpc.contentInsetAdjustmentBehavior = .always
+            fpc.surfaceView.appearance = {
+                let appearance = SurfaceAppearance()
+                appearance.cornerRadius = 6.0
+                return appearance
+            }()
+
+            let tapGesture = UITapGestureRecognizer(target: self, action: #selector(UseCaseController.handleSurface(tapGesture:)))
+            tapGesture.cancelsTouchesInView = false
+            tapGesture.numberOfTapsRequired = 2
+            // Prevents a delay to response a tap in menus of DebugTableViewController.
+            tapGesture.delaysTouchesEnded = false
+            fpc.surfaceView.addGestureRecognizer(tapGesture)
+
+            fpc.set(contentViewController: contentVC)
+            if #available(iOS 14, *),
+                let scrollView = (fpc.contentViewController as? DebugListCollectionViewController)?.collectionView {
+                    fpc.track(scrollView: scrollView)
+            }
+            addMain(panel: fpc)
+
         case .trackingTextView:
             let fpc = FloatingPanelController()
             fpc.delegate = self
@@ -157,6 +182,20 @@ extension UseCaseController {
             let fpc = MultiPanelController()
             mainVC.present(fpc, animated: true, completion: nil)
 
+        case .showOnWindow:
+            let fpc = overWindowPanelVC
+            fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+            fpc.isRemovalInteractionEnabled = true
+            fpc.set(contentViewController: contentVC)
+            fpc.ext_trackScrollView(in: contentVC)
+
+            guard let window = UIApplication.shared.windows.first else { fatalError("Any window not found") }
+
+            window.addSubview(fpc.view)
+            fpc.view.frame = window.bounds
+            fpc.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+
+            fpc.show(animated: true)
         case .showPanelInSheetModal:
             let fpc = FloatingPanelController()
             let contentVC = UIViewController()
@@ -212,25 +251,52 @@ extension UseCaseController {
             addMain(panel: fpc)
 
         case .showTopPositionedPanel: // For debug
-            let fpc = FloatingPanelController()
+            let fpc = FloatingPanelController(delegate: self)
             let contentVC = UIViewController()
             contentVC.view.backgroundColor = .red
             fpc.set(contentViewController: contentVC)
             addMain(panel: fpc)
 
-        case .showAdaptivePanel, .showAdaptivePanelWithCustomGuide:
+        case .showAdaptivePanel:
             let fpc = FloatingPanelController()
             fpc.isRemovalInteractionEnabled = true
             fpc.set(contentViewController: contentVC)
             fpc.ext_trackScrollView(in: contentVC)
             if case let contentVC as ImageViewController = contentVC {
-                if #available(iOS 11.0, *) {
-                    let mode: ImageViewController.Mode = (useCase == .showAdaptivePanelWithCustomGuide) ? .withHeaderFooter : .onlyImage
-                    let layoutGuide = contentVC.layoutGuideFor(mode: mode)
-                    fpc.layout = ImageViewController.PanelLayout(targetGuide: layoutGuide)
-                } else {
-                    fpc.layout = ImageViewController.PanelLayout(targetGuide: nil)
-                }
+                let mode: ImageViewController.Mode = (useCase == .showAdaptivePanelWithTableView) ? .withHeaderFooter : .onlyImage
+                let layoutGuide = contentVC.layoutGuideFor(mode: mode)
+                fpc.layout = ImageViewController.PanelLayout(targetGuide: layoutGuide)
+            }
+            addMain(panel: fpc)
+
+        case .showAdaptivePanelWithTableView:
+            let fpc = FloatingPanelController()
+            fpc.isRemovalInteractionEnabled = true
+            fpc.contentInsetAdjustmentBehavior = .always
+            fpc.surfaceView.appearance = {
+                let appearance = SurfaceAppearance()
+                appearance.cornerRadius = 6.0
+                return appearance
+            }()
+
+            fpc.set(contentViewController: contentVC)
+            fpc.track(scrollView: (contentVC as! TableViewControllerForAdaptiveLayout).tableView)
+            fpc.layout = TableViewControllerForAdaptiveLayout.PanelLayout(targetGuide: contentVC.view.makeBoundsLayoutGuide())
+            addMain(panel: fpc)
+
+        case .showAdaptivePanelWithCollectionView, .showAdaptivePanelWithCompositionalCollectionView:
+            let fpc = FloatingPanelController()
+            fpc.isRemovalInteractionEnabled = true
+            fpc.contentInsetAdjustmentBehavior = .always
+            fpc.surfaceView.appearance = {
+                let appearance = SurfaceAppearance()
+                appearance.cornerRadius = 6.0
+                return appearance
+            }()
+            fpc.set(contentViewController: contentVC)
+            if #available(iOS 13, *) {
+                fpc.track(scrollView: (contentVC as! CollectionViewControllerForAdaptiveLayout).collectionView)
+                fpc.layout = CollectionViewControllerForAdaptiveLayout.PanelLayout(targetGuide: contentVC.view.makeBoundsLayoutGuide())
             }
             addMain(panel: fpc)
 
@@ -246,6 +312,52 @@ extension UseCaseController {
             fpc.set(contentViewController: contentVC)
             fpc.ext_trackScrollView(in: contentVC)
             addMain(panel: fpc)
+
+        case .showCustomBackdrop:
+            class BlurBackdropView: BackdropView {
+                var effectView: UIVisualEffectView!
+                override var alpha: CGFloat {
+                    set {
+                        effectView.alpha = newValue
+                    }
+                    get {
+                        effectView.alpha
+                    }
+                }
+                override init() {
+                    super.init()
+
+                    let effect = UIBlurEffect(style: .prominent)
+                    let effectView = UIVisualEffectView(effect: effect)
+                    addSubview(effectView)
+                    effectView.frame = bounds
+                    effectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+                    self.effectView = effectView
+                }
+
+                required init?(coder: NSCoder) {
+                    fatalError("init(coder:) has not been implemented")
+                }
+            }
+            class CustomBottomLayout: FloatingPanelBottomLayout {
+                override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
+                    return [
+                        .full: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
+                        .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+                        .tip: FloatingPanelLayoutAnchor(fractionalInset: 0.1, edge: .bottom, referenceGuide: .safeArea),
+                    ]
+                }
+                override func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+                    return state == .full ? 0.8 : 0.0
+                }
+            }
+
+            let fpc = FloatingPanelController()
+            fpc.delegate = self
+            fpc.set(contentViewController: contentVC)
+            fpc.backdropView = BlurBackdropView()
+            fpc.layout = CustomBottomLayout()
+            addMain(panel: fpc)
         }
     }
 
@@ -283,7 +395,7 @@ extension UseCaseController {
         }
     }
 
-   @objc
+    @objc
     private func handleSurface(tapGesture: UITapGestureRecognizer) {
         switch mainPanelVC.state {
         case .full:
@@ -295,8 +407,16 @@ extension UseCaseController {
 }
 
 extension UseCaseController: FloatingPanelControllerDelegate {
+    func floatingPanel(
+        _ fpc: FloatingPanelController,
+        shouldAllowToScroll scrollView: UIScrollView,
+        in state: FloatingPanelState
+    ) -> Bool {
+        return state == .full || state == .half
+    }
+
     func floatingPanel(_ vc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint {
-        if useCase == .showNavigationController, #available(iOS 11.0, *) {
+        if useCase == .showNavigationController {
             // 148.0 is the SafeArea's top value for a navigation bar with a large title.
             return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top - 148.0)
         }
@@ -377,6 +497,9 @@ private extension FloatingPanelController {
         case let contentVC as ImageViewController:
             track(scrollView: contentVC.scrollView)
 
+        case let contentVC as TableViewControllerForAdaptiveLayout:
+            track(scrollView: contentVC.tableView)
+
         default:
             break
         }

Examples/Samples/Tests/Info.plist

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>$(DEVELOPMENT_LANGUAGE)</string>
-	<key>CFBundleExecutable</key>
-	<string>$(EXECUTABLE_NAME)</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>$(PRODUCT_NAME)</string>
-	<key>CFBundlePackageType</key>
-	<string>BNDL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleVersion</key>
-	<string>1</string>
-</dict>
-</plist>

Examples/Samples/Tests/SampleTests.swift

@@ -1,28 +0,0 @@
-// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
-
-import XCTest
-@testable import FloatingPanelSample
-
-class SampleTests: XCTestCase {
-
-    override func setUp() {
-        // Put setup code here. This method is called before the invocation of each test method in the class.
-    }
-
-    override func tearDown() {
-        // Put teardown code here. This method is called after the invocation of each test method in the class.
-    }
-
-    func testExample() {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct results.
-    }
-
-    func testPerformanceExample() {
-        // This is an example of a performance test case.
-        self.measure {
-            // Put the code you want to measure the time of here.
-        }
-    }
-
-}

Examples/Samples/UITests/Info.plist

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>$(DEVELOPMENT_LANGUAGE)</string>
-	<key>CFBundleExecutable</key>
-	<string>$(EXECUTABLE_NAME)</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>$(PRODUCT_NAME)</string>
-	<key>CFBundlePackageType</key>
-	<string>BNDL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleVersion</key>
-	<string>1</string>
-</dict>
-</plist>

Examples/Samples/UITests/SampleUITests.swift

@@ -1,28 +0,0 @@
-// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
-
-import XCTest
-
-class SampleUITests: XCTestCase {
-
-    override func setUp() {
-        // Put setup code here. This method is called before the invocation of each test method in the class.
-
-        // In UI tests it is usually best to stop immediately when a failure occurs.
-        continueAfterFailure = false
-
-        // UI tests must launch the application that they test. Doing this in setup will make sure it happens for each test method.
-        XCUIApplication().launch()
-
-        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
-    }
-
-    override func tearDown() {
-        // Put teardown code here. This method is called after the invocation of each test method in the class.
-    }
-
-    func testExample() {
-        // Use recording to get started writing UI tests.
-        // Use XCTAssert and related functions to verify your tests produce the correct results.
-    }
-
-}

Examples/SamplesObjC/SamplesObjC.xcodeproj/project.pbxproj

@@ -44,6 +44,7 @@
 		545BA71321BA3217007F7846 /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
 		545BA72221BA3867007F7846 /* SamplesObjC-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "SamplesObjC-Bridging-Header.h"; sourceTree = "<group>"; };
 		545BA72521BA3BAF007F7846 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		5D82A6AF28D18443006A44BA /* libswiftCoreGraphics.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libswiftCoreGraphics.tbd; path = usr/lib/swift/libswiftCoreGraphics.tbd; sourceTree = SDKROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -64,6 +65,7 @@
 				545BA72521BA3BAF007F7846 /* FloatingPanel.framework */,
 				545BA70321BA3214007F7846 /* SamplesObjC */,
 				545BA70221BA3214007F7846 /* Products */,
+				5D82A6AE28D18443006A44BA /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -92,6 +94,14 @@
 			path = SamplesObjC;
 			sourceTree = "<group>";
 		};
+		5D82A6AE28D18443006A44BA /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				5D82A6AF28D18443006A44BA /* libswiftCoreGraphics.tbd */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -320,6 +330,10 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.SamplesObjC;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "SamplesObjC/SamplesObjC-Bridging-Header.h";
@@ -342,6 +356,10 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.SamplesObjC;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "SamplesObjC/SamplesObjC-Bridging-Header.h";

Examples/Stocks/Stocks.xcodeproj/project.pbxproj

@@ -14,6 +14,7 @@
 		548DF95E21705BE10041922A /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95C21705BE10041922A /* LaunchScreen.storyboard */; };
 		549D23CF233C77CF008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */; };
 		549D23D0233C77CF008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
+		5D82A6AA28D18432006A44BA /* libswiftCoreGraphics.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = 5D82A6A928D1842B006A44BA /* libswiftCoreGraphics.tbd */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -39,6 +40,7 @@
 		548DF95D21705BE10041922A /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		548DF95F21705BE10041922A /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		5D82A6A928D1842B006A44BA /* libswiftCoreGraphics.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libswiftCoreGraphics.tbd; path = usr/lib/swift/libswiftCoreGraphics.tbd; sourceTree = SDKROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -46,6 +48,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				5D82A6AA28D18432006A44BA /* libswiftCoreGraphics.tbd in Frameworks */,
 				549D23CF233C77CF008EF4D7 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -59,6 +62,7 @@
 				549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */,
 				548DF95221705BE00041922A /* Stocks */,
 				548DF95121705BE00041922A /* Products */,
+				5D82A6A828D1842A006A44BA /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -83,6 +87,14 @@
 			path = Stocks;
 			sourceTree = "<group>";
 		};
+		5D82A6A828D1842A006A44BA /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				5D82A6A928D1842B006A44BA /* libswiftCoreGraphics.tbd */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -312,6 +324,10 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.Stocks;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -331,6 +347,10 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(SDKROOT)/usr/lib/swift",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.Stocks;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;

Examples/Stocks/Stocks/MainViewController.swift

@@ -81,7 +81,7 @@ class MainViewController: UIViewController, FloatingPanelControllerDelegate {
     }
 
     private func hideStockTickerBanner() {
-        // Dimiss top bar with dissolve animation
+        // Dismiss top bar with dissolve animation
         UIView.animate(withDuration: 0.25) {
             self.topBannerView.alpha = 0.0
             self.labelStackView.alpha = 1.0
@@ -101,14 +101,12 @@ class FloatingPanelStocksLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .tip
 
-    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 56.0, edge: .top, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 262.0, edge: .bottom, referenceGuide: .safeArea),
-             /* Visible + ToolView */
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 85.0 + 44.0, edge: .bottom, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 56.0, edge: .top, referenceGuide: .safeArea),
+        .half: FloatingPanelLayoutAnchor(absoluteInset: 262.0, edge: .bottom, referenceGuide: .safeArea),
+         /* Visible + ToolView */
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 85.0 + 44.0, edge: .bottom, referenceGuide: .safeArea),
+    ]
 
     func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
         return 0.0

FloatingPanel.podspec

@@ -1,20 +1,20 @@
 Pod::Spec.new do |s|
 
   s.name                = "FloatingPanel"
-  s.version             = "2.5.3"
+  s.version             = "2.8.3"
   s.summary             = "FloatingPanel is a clean and easy-to-use UI component of a floating panel interface."
   s.description         = <<-DESC
 FloatingPanel is a clean and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app.
 The new interface displays the related contents and utilities in parallel as a user wants.
                    DESC
-  s.homepage            = "https://github.com/SCENEE/FloatingPanel"
+  s.homepage            = "https://github.com/scenee/FloatingPanel"
   s.author              = "Shin Yamamoto"
   s.social_media_url    = "https://twitter.com/scenee"
 
-  s.platform            = :ios, "10.0"
-  s.source              = { :git => "https://github.com/SCENEE/FloatingPanel.git", :tag => s.version.to_s }
+  s.platform            = :ios, "11.0"
+  s.source              = { :git => "https://github.com/scenee/FloatingPanel.git", :tag => s.version.to_s }
   s.source_files        = "Sources/*.swift"
-  s.swift_versions      = ['5.1', '5.2', '5.3']
+  s.swift_version       = '5.0'
 
   s.framework           = "UIKit"
 

FloatingPanel.xcodeproj/project.pbxproj

@@ -17,23 +17,23 @@
 		545DB9E021511AC100CA77B8 /* Controller.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9DF21511AC100CA77B8 /* Controller.swift */; };
 		545DBA2B2152383100CA77B8 /* GrabberView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA2A2152383100CA77B8 /* GrabberView.swift */; };
 		546055BF2333C4740069F400 /* TestSupports.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542753C722C49A8F00D17955 /* TestSupports.swift */; };
-		5469F4A224B003EF00537F8A /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 5469F49F24B003EF00537F8A /* LaunchScreen.storyboard */; };
-		5469F4A324B003EF00537F8A /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5469F4A024B003EF00537F8A /* AppDelegate.swift */; };
 		5469F4AE24B30D7E00537F8A /* State.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5469F4AD24B30D7E00537F8A /* State.swift */; };
 		5469F4B024B30E1500537F8A /* LayoutAnchoring.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5469F4AF24B30E1500537F8A /* LayoutAnchoring.swift */; };
 		5469F4B224B30F1100537F8A /* Position.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5469F4B124B30F1100537F8A /* Position.swift */; };
-		5469F4B424B30F3500537F8A /* LayoutReferences.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5469F4B324B30F3500537F8A /* LayoutReferences.swift */; };
+		5469F4B424B30F3500537F8A /* LayoutProperties.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5469F4B324B30F3500537F8A /* LayoutProperties.swift */; };
+		547F7A9C2A6E946000303905 /* GestureTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 547F7A9B2A6E946000303905 /* GestureTests.swift */; };
 		549C371F2361E15E007D8058 /* ExtensionTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 549C371E2361E15D007D8058 /* ExtensionTests.swift */; };
 		549E944522CF295D0050AECF /* StateTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 549E944422CF295D0050AECF /* StateTests.swift */; };
 		54A6B6B122968B530077F348 /* CoreTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B022968B530077F348 /* CoreTests.swift */; };
 		54A6B6B82296A8520077F348 /* SurfaceViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B72296A8520077F348 /* SurfaceViewTests.swift */; };
-		54ABD7AF216CCFF7002E6C13 /* Logger.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54ABD7AE216CCFF7002E6C13 /* Logger.swift */; };
+		54ABD7AF216CCFF7002E6C13 /* Logging.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54ABD7AE216CCFF7002E6C13 /* Logging.swift */; };
 		54CDC5D3215B6D5A007D205C /* SurfaceView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D2215B6D5A007D205C /* SurfaceView.swift */; };
 		54CDC5D5215B6D8D007D205C /* BackdropView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D4215B6D8D007D205C /* BackdropView.swift */; };
 		54CFBFC3215CD045006B5735 /* Layout.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC2215CD045006B5735 /* Layout.swift */; };
 		54CFBFC5215CD09C006B5735 /* Core.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC4215CD09C006B5735 /* Core.swift */; };
 		54DBA3DC262E938500D75969 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54DBA3DB262E938500D75969 /* Extensions.swift */; };
 		54E3992727141F5100A8F9ED /* FloatingPanel.docc in Sources */ = {isa = PBXBuildFile; fileRef = 54E3992627141F5100A8F9ED /* FloatingPanel.docc */; };
+		5D82A6B528D18464006A44BA /* libswiftCoreGraphics.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = 5D82A6B428D18461006A44BA /* libswiftCoreGraphics.tbd */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -44,13 +44,6 @@
 			remoteGlobalIDString = 545DB9C02151169500CA77B8;
 			remoteInfo = FloatingModalController;
 		};
-		54E740DC218AFE9F005C1A34 /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 545DB9B82151169500CA77B8 /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 54E740C9218AFD67005C1A34;
-			remoteInfo = TestingHost;
-		};
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
@@ -67,25 +60,23 @@
 		545DB9D12151169500CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		545DB9DF21511AC100CA77B8 /* Controller.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Controller.swift; sourceTree = "<group>"; };
 		545DBA2A2152383100CA77B8 /* GrabberView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GrabberView.swift; sourceTree = "<group>"; };
-		5469F49F24B003EF00537F8A /* LaunchScreen.storyboard */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.storyboard; path = LaunchScreen.storyboard; sourceTree = "<group>"; };
-		5469F4A024B003EF00537F8A /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
-		5469F4A124B003EF00537F8A /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		5469F4AD24B30D7E00537F8A /* State.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = State.swift; sourceTree = "<group>"; };
 		5469F4AF24B30E1500537F8A /* LayoutAnchoring.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutAnchoring.swift; sourceTree = "<group>"; };
 		5469F4B124B30F1100537F8A /* Position.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Position.swift; sourceTree = "<group>"; };
-		5469F4B324B30F3500537F8A /* LayoutReferences.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutReferences.swift; sourceTree = "<group>"; };
+		5469F4B324B30F3500537F8A /* LayoutProperties.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutProperties.swift; sourceTree = "<group>"; };
+		547F7A9B2A6E946000303905 /* GestureTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GestureTests.swift; sourceTree = "<group>"; };
 		549C371E2361E15D007D8058 /* ExtensionTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ExtensionTests.swift; sourceTree = "<group>"; };
 		549E944422CF295D0050AECF /* StateTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StateTests.swift; sourceTree = "<group>"; };
 		54A6B6B022968B530077F348 /* CoreTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CoreTests.swift; sourceTree = "<group>"; };
 		54A6B6B72296A8520077F348 /* SurfaceViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SurfaceViewTests.swift; sourceTree = "<group>"; };
-		54ABD7AE216CCFF7002E6C13 /* Logger.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Logger.swift; sourceTree = "<group>"; };
+		54ABD7AE216CCFF7002E6C13 /* Logging.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Logging.swift; sourceTree = "<group>"; };
 		54CDC5D2215B6D5A007D205C /* SurfaceView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SurfaceView.swift; sourceTree = "<group>"; };
 		54CDC5D4215B6D8D007D205C /* BackdropView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackdropView.swift; sourceTree = "<group>"; };
 		54CFBFC2215CD045006B5735 /* Layout.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Layout.swift; sourceTree = "<group>"; };
 		54CFBFC4215CD09C006B5735 /* Core.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Core.swift; sourceTree = "<group>"; };
 		54DBA3DB262E938500D75969 /* Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
 		54E3992627141F5100A8F9ED /* FloatingPanel.docc */ = {isa = PBXFileReference; lastKnownFileType = folder.documentationcatalog; path = FloatingPanel.docc; sourceTree = "<group>"; };
-		54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = FloatingPanelTesting.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		5D82A6B428D18461006A44BA /* libswiftCoreGraphics.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libswiftCoreGraphics.tbd; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/lib/swift/libswiftCoreGraphics.tbd; sourceTree = DEVELOPER_DIR; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -93,6 +84,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				5D82A6B528D18464006A44BA /* libswiftCoreGraphics.tbd in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -104,13 +96,6 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		54E740C7218AFD67005C1A34 /* Frameworks */ = {
-			isa = PBXFrameworksBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -120,6 +105,7 @@
 				545DB9C32151169500CA77B8 /* Sources */,
 				545DB9CE2151169500CA77B8 /* Tests */,
 				545DB9C22151169500CA77B8 /* Products */,
+				5D82A6B328D18460006A44BA /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -128,7 +114,6 @@
 			children = (
 				545DB9C12151169500CA77B8 /* FloatingPanel.framework */,
 				545DB9CA2151169500CA77B8 /* FloatingPanelTests.xctest */,
-				54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -141,7 +126,7 @@
 				5469F4B124B30F1100537F8A /* Position.swift */,
 				54CFBFC4215CD09C006B5735 /* Core.swift */,
 				54CFBFC2215CD045006B5735 /* Layout.swift */,
-				5469F4B324B30F3500537F8A /* LayoutReferences.swift */,
+				5469F4B324B30F3500537F8A /* LayoutProperties.swift */,
 				5469F4AF24B30E1500537F8A /* LayoutAnchoring.swift */,
 				5450EEE321646DF500135936 /* Behavior.swift */,
 				54352E9721A521CA00CBCA08 /* PassthroughView.swift */,
@@ -150,7 +135,7 @@
 				545DBA2A2152383100CA77B8 /* GrabberView.swift */,
 				54352E9521A51A2500CBCA08 /* Transitioning.swift */,
 				54DBA3DB262E938500D75969 /* Extensions.swift */,
-				54ABD7AE216CCFF7002E6C13 /* Logger.swift */,
+				54ABD7AE216CCFF7002E6C13 /* Logging.swift */,
 				545DB9C42151169500CA77B8 /* FloatingPanel.h */,
 				545DB9C52151169500CA77B8 /* Info.plist */,
 				54E3992627141F5100A8F9ED /* FloatingPanel.docc */,
@@ -161,9 +146,9 @@
 		545DB9CE2151169500CA77B8 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
-				5469F49E24B003EF00537F8A /* TestingApp */,
 				54A6B6B022968B530077F348 /* CoreTests.swift */,
 				545DB9CF2151169500CA77B8 /* ControllerTests.swift */,
+				547F7A9B2A6E946000303905 /* GestureTests.swift */,
 				542753C522C49A6E00D17955 /* LayoutTests.swift */,
 				54A6B6B72296A8520077F348 /* SurfaceViewTests.swift */,
 				549E944422CF295D0050AECF /* StateTests.swift */,
@@ -174,14 +159,12 @@
 			path = Tests;
 			sourceTree = "<group>";
 		};
-		5469F49E24B003EF00537F8A /* TestingApp */ = {
+		5D82A6B328D18460006A44BA /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
-				5469F49F24B003EF00537F8A /* LaunchScreen.storyboard */,
-				5469F4A024B003EF00537F8A /* AppDelegate.swift */,
-				5469F4A124B003EF00537F8A /* Info.plist */,
+				5D82A6B428D18461006A44BA /* libswiftCoreGraphics.tbd */,
 			);
-			path = TestingApp;
+			name = Frameworks;
 			sourceTree = "<group>";
 		};
 /* End PBXGroup section */
@@ -228,30 +211,12 @@
 			);
 			dependencies = (
 				545DB9CD2151169500CA77B8 /* PBXTargetDependency */,
-				54E740DD218AFE9F005C1A34 /* PBXTargetDependency */,
 			);
 			name = FloatingPanelTests;
 			productName = FloatingModalControllerTests;
 			productReference = 545DB9CA2151169500CA77B8 /* FloatingPanelTests.xctest */;
 			productType = "com.apple.product-type.bundle.unit-test";
 		};
-		54E740C9218AFD67005C1A34 /* TestingApp */ = {
-			isa = PBXNativeTarget;
-			buildConfigurationList = 54E740D9218AFD6A005C1A34 /* Build configuration list for PBXNativeTarget "TestingApp" */;
-			buildPhases = (
-				54E740C6218AFD67005C1A34 /* Sources */,
-				54E740C7218AFD67005C1A34 /* Frameworks */,
-				54E740C8218AFD67005C1A34 /* Resources */,
-			);
-			buildRules = (
-			);
-			dependencies = (
-			);
-			name = TestingApp;
-			productName = TestingHost;
-			productReference = 54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */;
-			productType = "com.apple.product-type.application";
-		};
 /* End PBXNativeTarget section */
 
 /* Begin PBXProject section */
@@ -268,10 +233,6 @@
 					};
 					545DB9C92151169500CA77B8 = {
 						CreatedOnToolsVersion = 10.0;
-						TestTargetID = 54E740C9218AFD67005C1A34;
-					};
-					54E740C9218AFD67005C1A34 = {
-						CreatedOnToolsVersion = 10.1;
 					};
 				};
 			};
@@ -290,7 +251,6 @@
 			targets = (
 				545DB9C02151169500CA77B8 /* FloatingPanel */,
 				545DB9C92151169500CA77B8 /* FloatingPanelTests */,
-				54E740C9218AFD67005C1A34 /* TestingApp */,
 			);
 		};
 /* End PBXProject section */
@@ -310,14 +270,6 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		54E740C8218AFD67005C1A34 /* Resources */ = {
-			isa = PBXResourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-				5469F4A224B003EF00537F8A /* LaunchScreen.storyboard in Resources */,
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
@@ -329,11 +281,11 @@
 				5469F4B024B30E1500537F8A /* LayoutAnchoring.swift in Sources */,
 				54CDC5D3215B6D5A007D205C /* SurfaceView.swift in Sources */,
 				54CFBFC3215CD045006B5735 /* Layout.swift in Sources */,
-				5469F4B424B30F3500537F8A /* LayoutReferences.swift in Sources */,
+				5469F4B424B30F3500537F8A /* LayoutProperties.swift in Sources */,
 				54CDC5D5215B6D8D007D205C /* BackdropView.swift in Sources */,
 				54352E9821A521CA00CBCA08 /* PassthroughView.swift in Sources */,
 				54CFBFC5215CD09C006B5735 /* Core.swift in Sources */,
-				54ABD7AF216CCFF7002E6C13 /* Logger.swift in Sources */,
+				54ABD7AF216CCFF7002E6C13 /* Logging.swift in Sources */,
 				545DB9E021511AC100CA77B8 /* Controller.swift in Sources */,
 				54DBA3DC262E938500D75969 /* Extensions.swift in Sources */,
 				5450EEE421646DF500135936 /* Behavior.swift in Sources */,
@@ -355,14 +307,7 @@
 				542753C622C49A6E00D17955 /* LayoutTests.swift in Sources */,
 				54A6B6B82296A8520077F348 /* SurfaceViewTests.swift in Sources */,
 				546055BF2333C4740069F400 /* TestSupports.swift in Sources */,
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
-		54E740C6218AFD67005C1A34 /* Sources */ = {
-			isa = PBXSourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-				5469F4A324B003EF00537F8A /* AppDelegate.swift in Sources */,
+				547F7A9C2A6E946000303905 /* GestureTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -374,11 +319,6 @@
 			target = 545DB9C02151169500CA77B8 /* FloatingPanel */;
 			targetProxy = 545DB9CC2151169500CA77B8 /* PBXContainerItemProxy */;
 		};
-		54E740DD218AFE9F005C1A34 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			target = 54E740C9218AFD67005C1A34 /* TestingApp */;
-			targetProxy = 54E740DC218AFE9F005C1A34 /* PBXContainerItemProxy */;
-		};
 /* End PBXTargetDependency section */
 
 /* Begin XCBuildConfiguration section */
@@ -522,12 +462,13 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Sources/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
@@ -553,12 +494,13 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Sources/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
@@ -575,17 +517,17 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Tests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FloatingPanelTesting.app/FloatingPanelTesting";
 			};
 			name = Debug;
 		};
@@ -596,53 +538,17 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Tests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FloatingPanelTesting.app/FloatingPanelTesting";
-			};
-			name = Release;
-		};
-		54E740DA218AFD6A005C1A34 /* Debug */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = Tests/TestingApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTesting;
-				PRODUCT_NAME = FloatingPanelTesting;
-				SWIFT_VERSION = 5.0;
-				TARGETED_DEVICE_FAMILY = "1,2";
-			};
-			name = Debug;
-		};
-		54E740DB218AFD6A005C1A34 /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = Tests/TestingApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTesting;
-				PRODUCT_NAME = FloatingPanelTesting;
-				SWIFT_VERSION = 5.0;
-				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
@@ -725,16 +631,17 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Sources/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "TEST DEBUG __FP_LOG";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "TEST DEBUG FP_LOG";
 				SWIFT_COMPILATION_MODE = singlefile;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
@@ -749,31 +656,17 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Tests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FloatingPanelTesting.app/FloatingPanelTesting";
-			};
-			name = Test;
-		};
-		54E8AC6A2286CFB6000C5A12 /* Test */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = Tests/TestingApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = "@executable_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTesting;
-				PRODUCT_NAME = FloatingPanelTesting;
-				SWIFT_VERSION = 5.0;
-				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Test;
 		};
@@ -810,16 +703,6 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		54E740D9218AFD6A005C1A34 /* Build configuration list for PBXNativeTarget "TestingApp" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				54E740DA218AFD6A005C1A34 /* Debug */,
-				54E740DB218AFD6A005C1A34 /* Release */,
-				54E8AC6A2286CFB6000C5A12 /* Test */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 545DB9B82151169500CA77B8 /* Project object */;

Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "FloatingPanel",
     platforms: [
-        .iOS(.v10)
+        .iOS(.v11)
     ],
     products: [
         // Products define the executables and libraries produced by a package, and make them visible to other packages.

README.md

@@ -1,15 +1,15 @@
-[![Build Status](https://travis-ci.org/SCENEE/FloatingPanel.svg?branch=master)](https://travis-ci.org/SCENEE/FloatingPanel)
-[![Version](https://img.shields.io/cocoapods/v/FloatingPanel.svg)](https://cocoapods.org/pods/FloatingPanel)
-[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+[![Swift 5](https://img.shields.io/badge/swift-5-orange.svg?style=flat)](https://swift.org/)
 [![Platform](https://img.shields.io/cocoapods/p/FloatingPanel.svg)](https://cocoapods.org/pods/FloatingPanel)
-[![Swift 5](https://img.shields.io/badge/Swift-5-orange.svg?style=flat)](https://swift.org/)
+[![Version](https://img.shields.io/cocoapods/v/FloatingPanel.svg)](https://cocoapods.org/pods/FloatingPanel)
+![GitHub Workflow Status (with branch)](https://img.shields.io/github/actions/workflow/status/scenee/FloatingPanel/ci.yml?branch=master)
+[![Carthage compatible](https://img.shields.io/badge/carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 
 # FloatingPanel
 
-FloatingPanel is a simple and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app.
-The new interface displays the related contents and utilities in parallel as a user wants.
+FloatingPanel is a simple and easy-to-use UI component designed for a user interface featured in Apple Maps, Shortcuts and Stocks app.
+The user interface displays related content and utilities alongside the main content.
 
-📝[Here](https://docs.scenee.com/documentation/floatingpanel) is the API references for the latest version powered by [DocC](https://developer.apple.com/documentation/docc).
+Please see also [the API reference@SPI](https://swiftpackageindex.com/scenee/FloatingPanel/2.8.3/documentation/floatingpanel) for more details.
 
 ![Maps](https://github.com/SCENEE/FloatingPanel/blob/master/assets/maps.gif)
 ![Stocks](https://github.com/SCENEE/FloatingPanel/blob/master/assets/stocks.gif)
@@ -21,47 +21,47 @@ The new interface displays the related contents and utilities in parallel as a u
 - [Features](#features)
 - [Requirements](#requirements)
 - [Installation](#installation)
-    - [CocoaPods](#cocoapods)
-    - [Carthage](#carthage)
-    - [Swift Package Manager](#swift-package-manager)
+  - [CocoaPods](#cocoapods)
+  - [Carthage](#carthage)
+  - [Swift Package Manager](#swift-package-manager)
 - [Getting Started](#getting-started)
-    - [Add a floating panel as a child view controller](#add-a-floating-panel-as-a-child-view-controller)
-    - [Present a floating panel as a modality](#present-a-floating-panel-as-a-modality)
+  - [Add a floating panel as a child view controller](#add-a-floating-panel-as-a-child-view-controller)
+  - [Present a floating panel as a modality](#present-a-floating-panel-as-a-modality)
 - [View hierarchy](#view-hierarchy)
 - [Usage](#usage)
-    - [Show/Hide a floating panel in a view with your view hierarchy](#showhide-a-floating-panel-in-a-view-with-your-view-hierarchy)
-    - [Scale the content view when the surface position changes](#scale-the-content-view-when-the-surface-position-changes)
-    - [Customize the layout with `FloatingPanelLayout` protocol](#customize-the-layout-with-floatingpanellayout-protocol)
-        - [Change the initial layout](#change-the-initial-layout)
-    - [Update your panel layout](#update-your-panel-layout)
-        - [Support your landscape layout](#support-your-landscape-layout)
-        - [Use the intrinsic size of a content in your panel layout](#use-the-intrinsic-size-of-a-content-in-your-panel-layout)
-        - [Specify an anchor for each state by an inset of the `FloatingPanelController.view` frame](#specify-an-anchor-for-each-state-by-an-inset-of-the-floatingpanelcontrollerview-frame)
-        - [Change the backdrop alpha](#change-the-backdrop-alpha)
-        - [Using custome panel states](#using-custome-panel-states)
-    - [Customize the behavior with `FloatingPanelBehavior` protocol](#customize-the-behavior-with-floatingpanelbehavior-protocol)
-        - [Modify your floating panel's interaction](#modify-your-floating-panels-interaction)
-        - [Activate the rubber-band effect on panel edges](#activate-the-rubber-band-effect-on-panel-edges)
-        - [Manage the projection of a pan gesture momentum](#manage-the-projection-of-a-pan-gesture-momentum)
-    - [Specify the panel move's boundary](#specify-the-panel-moves-boundary)
-    - [Customize the surface design](#customize-the-surface-design)
-        - [Modify your surface appearance](#modify-your-surface-appearance)
-        - [Use a custom grabber handle](#use-a-custom-grabber-handle)
-        - [Customize layout of the grabber handle](#customize-layout-of-the-grabber-handle)
-        - [Customize content padding from surface edges](#customize-content-padding-from-surface-edges)
-        - [Customize margins of the surface edges](#customize-margins-of-the-surface-edges)
-    - [Customize gestures](#customize-gestures)
-        - [Suppress the panel interaction](#suppress-the-panel-interaction)
-        - [Add tap gestures to the surface view](#add-tap-gestures-to-the-surface-view)
-        - [Interrupt the delegate methods of `FloatingPanelController.panGestureRecognizer`](#interrupt-the-delegate-methods-of-floatingpanelcontrollerpangesturerecognizer)
-    - [Create an additional floating panel for a detail](#create-an-additional-floating-panel-for-a-detail)
-    - [Move a position with an animation](#move-a-position-with-an-animation)
-    - [Work your contents together with a floating panel behavior](#work-your-contents-together-with-a-floating-panel-behavior)
-    - [Enabling the tap-to-dismiss action of the backdrop view](#enabling-the-tap-to-dismiss-action-of-the-backdrop-view)
+  - [Show/Hide a floating panel in a view with your view hierarchy](#showhide-a-floating-panel-in-a-view-with-your-view-hierarchy)
+  - [Scale the content view when the surface position changes](#scale-the-content-view-when-the-surface-position-changes)
+  - [Customize the layout with `FloatingPanelLayout` protocol](#customize-the-layout-with-floatingpanellayout-protocol)
+    - [Change the initial layout](#change-the-initial-layout)
+  - [Update your panel layout](#update-your-panel-layout)
+    - [Support your landscape layout](#support-your-landscape-layout)
+    - [Use the intrinsic size of a content in your panel layout](#use-the-intrinsic-size-of-a-content-in-your-panel-layout)
+    - [Specify an anchor for each state by an inset of the `FloatingPanelController.view` frame](#specify-an-anchor-for-each-state-by-an-inset-of-the-floatingpanelcontrollerview-frame)
+    - [Change the backdrop alpha](#change-the-backdrop-alpha)
+    - [Using custome panel states](#using-custome-panel-states)
+  - [Customize the behavior with `FloatingPanelBehavior` protocol](#customize-the-behavior-with-floatingpanelbehavior-protocol)
+    - [Modify your floating panel's interaction](#modify-your-floating-panels-interaction)
+    - [Activate the rubber-band effect on panel edges](#activate-the-rubber-band-effect-on-panel-edges)
+    - [Manage the projection of a pan gesture momentum](#manage-the-projection-of-a-pan-gesture-momentum)
+  - [Specify the panel move's boundary](#specify-the-panel-moves-boundary)
+  - [Customize the surface design](#customize-the-surface-design)
+    - [Modify your surface appearance](#modify-your-surface-appearance)
+    - [Use a custom grabber handle](#use-a-custom-grabber-handle)
+    - [Customize layout of the grabber handle](#customize-layout-of-the-grabber-handle)
+    - [Customize content padding from surface edges](#customize-content-padding-from-surface-edges)
+    - [Customize margins of the surface edges](#customize-margins-of-the-surface-edges)
+  - [Customize gestures](#customize-gestures)
+    - [Suppress the panel interaction](#suppress-the-panel-interaction)
+    - [Add tap gestures to the surface view](#add-tap-gestures-to-the-surface-view)
+    - [Interrupt the delegate methods of `FloatingPanelController.panGestureRecognizer`](#interrupt-the-delegate-methods-of-floatingpanelcontrollerpangesturerecognizer)
+  - [Create an additional floating panel for a detail](#create-an-additional-floating-panel-for-a-detail)
+  - [Move a position with an animation](#move-a-position-with-an-animation)
+  - [Work your contents together with a floating panel behavior](#work-your-contents-together-with-a-floating-panel-behavior)
+  - [Enabling the tap-to-dismiss action of the backdrop view](#enabling-the-tap-to-dismiss-action-of-the-backdrop-view)
+  - [Allow to scroll content of the tracking scroll view in addition to the most expanded state](#allow-to-scroll-content-of-the-tracking-scroll-view-in-addition-to-the-most-expanded-state)
 - [Notes](#notes)
-    - ['Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller](#show-or-show-detail-segues-from-floatingpanelcontrollers-content-view-controller)
-    - [UISearchController issue](#uisearchcontroller-issue)
-    - [FloatingPanelSurfaceView's issue on iOS 10](#floatingpanelsurfaceviews-issue-on-ios-10)
+  - ['Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller](#show-or-show-detail-segues-from-floatingpanelcontrollers-content-view-controller)
+  - [UISearchController issue](#uisearchcontroller-issue)
 - [Maintainer](#maintainer)
 - [License](#license)
 
@@ -75,14 +75,14 @@ The new interface displays the related contents and utilities in parallel as a u
 - [x] Removal interaction
 - [x] Multi panel support
 - [x] Modal presentation
-- [x] 4 positioning support(top, left, bottom, right)
+- [x] Support for 4 positions (top, left, bottom, right)
 - [x] 1 or more magnetic anchors(full, half, tip and more)
 - [x] Layout support for all trait environments(i.e. Landscape orientation)
 - [x] Common UI elements: surface, backdrop and grabber handle
-- [x] Free from common issues of Auto Layout and gesture handling
+- [x] Free from common Auto Layout and gesture handling issues
 - [x] Compatible with Objective-C
 
-Examples are here.
+Examples can be found here:
 
 - [Examples/Maps](https://github.com/SCENEE/FloatingPanel/tree/master/Examples/Maps) like Apple Maps.app.
 - [Examples/Stocks](https://github.com/SCENEE/FloatingPanel/tree/master/Examples/Stocks) like Apple Stocks.app.
@@ -91,11 +91,7 @@ Examples are here.
 
 ## Requirements
 
-FloatingPanel is written in Swift 5.0+. Compatible with iOS 11.0+.
-
-The deployment is still iOS 10, but it is recommended to use this library on iOS 11+.
-
-:pencil2: You would like to use Swift 4.0. Please use FloatingPanel v1. 
+FloatingPanel is written in Swift 5.0+ and compatible with iOS 11.0+. 
 
 ## Installation
 
@@ -108,8 +104,6 @@ it, simply add the following line to your Podfile:
 pod 'FloatingPanel'
 ```
 
-:pencil2: FloatingPanel v1.7.0 or later requires CocoaPods v1.7.0+ for `swift_versions` support.
-
 ### Carthage
 
 For [Carthage](https://github.com/Carthage/Carthage), add the following to your `Cartfile`:
@@ -168,7 +162,8 @@ self.present(fpc, animated: true, completion: nil)
 
 You can show a floating panel over UINavigationController from the container view controllers as a modality of `.overCurrentContext` style.
 
-:pencil2: FloatingPanelController has the custom presentation controller. If you would like to customize the presentation/dismissal, please see [Transitioning](https://github.com/SCENEE/FloatingPanel/blob/master/Sources/Transitioning.swift).
+> [!NOTE]
+> FloatingPanelController has the custom presentation controller. If you would like to customize the presentation/dismissal, please see [Transitioning](https://github.com/SCENEE/FloatingPanel/blob/master/Sources/Transitioning.swift).
 
 ## View hierarchy
 
@@ -252,7 +247,8 @@ fpc.contentMode = .fitToBounds
 
 Otherwise, `FloatingPanelController` fixes the content by the height of the top most position.
 
-:pencil2: In `.fitToBounds` mode, the surface height changes as following a user interaction so that you have a responsibility to configure Auto Layout constrains not to break the layout of a content view by the elastic surface height.
+> [!NOTE]
+> In `.fitToBounds` mode, the surface height changes as following a user interaction so that you have a responsibility to configure Auto Layout constrains not to break the layout of a content view by the elastic surface height.
 
 ### Customize the layout with `FloatingPanelLayout` protocol
 
@@ -269,13 +265,11 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
 class MyFloatingPanelLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .tip
-    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+        .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea),
+    ]
 }
 ```
 
@@ -321,12 +315,11 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
 class LandscapePanelLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .tip
-    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
+    ]
+    
     func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
         return [
             surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
@@ -345,17 +338,16 @@ class LandscapePanelLayout: FloatingPanelLayout {
 class IntrinsicPanelLayout: FloatingPanelLayout {
     let position: FloatingPanelPosition = .bottom
     let initialState: FloatingPanelState = .full
-    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0, referenceGuide: .safeArea),
-            .half: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
-        ]
-    }
+    let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0, referenceGuide: .safeArea),
+        .half: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
+    ]
     ...
 }
 ```
 
-:pencil2: `FloatingPanelIntrinsicLayout` is deprecated on v1.
+> [!WARNING]
+> `FloatingPanelIntrinsicLayout` is deprecated on v1.
 
 #### Specify an anchor for each state by an inset of the `FloatingPanelController.view` frame
 
@@ -364,18 +356,16 @@ Use `.superview` reference guide in your anchors.
 ```swift
 class MyFullScreenLayout: FloatingPanelLayout {
     ...
-    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .superview),
-            .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .superview),
-        ]
-
-    }
+    let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .superview),
+        .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .superview),
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .superview),
+    ]
 }
 ```
 
-:pencil2: `FloatingPanelFullScreenLayout` is deprecated on v1.
+> [!WARNING]
+> `FloatingPanelFullScreenLayout` is deprecated on v1.
 
 #### Change the backdrop alpha
 
@@ -433,13 +423,14 @@ class ViewController: UIViewController, FloatingPanelControllerDelegate {
 class CustomPanelBehavior: FloatingPanelBehavior {
     let springDecelerationRate = UIScrollView.DecelerationRate.fast.rawValue + 0.02
     let springResponseTime = 0.4
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool {
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedState: FloatingPanelState) -> Bool {
         return true
     }
 }
 ```
 
-:pencil2: `floatingPanel(_ vc:behaviorFor:)` is deprecated on v1.
+> [!WARNING]
+> `floatingPanel(_ vc:behaviorFor:)` is deprecated on v1.
 
 #### Activate the rubber-band effect on panel edges
 
@@ -459,7 +450,7 @@ This allows full projectional panel behavior. For example, a user can swipe up a
 ```swift
 class MyPanelBehavior: FloatingPanelBehavior {
     ...
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelPosition) -> Bool {
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedState: FloatingPanelPosition) -> Bool {
         return true
     }
 }
@@ -481,7 +472,8 @@ func floatingPanelDidMove(_ vc: FloatingPanelController) {
 }
 ```
 
-:pencil2: `{top,bottom}InteractionBuffer` property is removed from `FloatingPanelLayout` since v2.
+> [!WARNING]
+> `{top,bottom}InteractionBuffer` property is removed from `FloatingPanelLayout` since v2.
 
 ### Customize the surface design
 
@@ -522,7 +514,8 @@ fpc.surfaceView.grabberHandlePadding = 10.0
 fpc.surfaceView.grabberHandleSize = .init(width: 44.0, height: 12.0)
 ```
 
-:pencil2: Note that `grabberHandleSize` width and height are reversed in the left/right position.
+> [!NOTE]
+> `grabberHandleSize` width and height are reversed in the left/right position.
 
 #### Customize content padding from surface edges
 
@@ -671,6 +664,24 @@ The tap-to-dismiss action is disabled by default. So it needs to be enabled as b
 fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
 ```
 
+### Allow to scroll content of the tracking scroll view in addition to the most expanded state
+
+Just define conditions to allow content scrolling in `floatingPanel(:_:shouldAllowToScroll:in)` delegate method. If the returned value is true, the scroll content scrolls when its scroll position is not at the top of the content.
+
+```swift
+class MyViewController: FloatingPanelControllerDelegate {
+    ... 
+
+    func floatingPanel(
+        _ fpc: FloatingPanelController,
+        shouldAllowToScroll trackingScrollView: UIScrollView,
+        in state: FloatingPanelState
+    ) -> Bool {
+        return state == .full || state == .half
+    }
+}
+```
+
 ## Notes
 
 ### 'Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller
@@ -711,21 +722,6 @@ It's a great way to decouple between a floating panel and the content VC.
 
 Because `UISearchController` automatically presents itself modally when a user interacts with the search bar, and then it swaps the superview of the search bar to the view managed by itself while it displays. As a result, `FloatingPanelController` can't control the search bar when it's active, as you can see from [the screen shot](https://github.com/SCENEE/FloatingPanel/issues/248#issuecomment-521263831).
 
-### FloatingPanelSurfaceView's issue on iOS 10
-
-* On iOS 10, `FloatingPanelSurfaceView.cornerRadius` isn't not automatically masked with the top rounded corners  because of `UIVisualEffectView` issue. See https://forums.developer.apple.com/thread/50854. 
-So you need to draw top rounding corners of your content.  Here is an example in Examples/Maps.
-```swift
-override func viewDidLayoutSubviews() {
-    super.viewDidLayoutSubviews()
-    if #available(iOS 10, *) {
-        visualEffectView.layer.cornerRadius = 9.0
-        visualEffectView.clipsToBounds = true
-    }
-}
-```
-* If you sets clear color to `FloatingPanelSurfaceView.backgroundColor`, please note the bottom overflow of your content on bouncing at full position. To prevent it, you need to expand your content. For example, See Example/Maps App's Auto Layout settings of `UIVisualEffectView` in Main.storyboard.
-
 ## Maintainer
 
 Shin Yamamoto <shin@scenee.com> | [@scenee](https://twitter.com/scenee)

Sources/BackdropView.swift

@@ -4,8 +4,22 @@ import UIKit
 
 /// A view that presents a backdrop interface behind a panel.
 @objc(FloatingPanelBackdropView)
-public class BackdropView: UIView {
+open class BackdropView: UIView {
 
     /// The gesture recognizer for tap gestures to dismiss a panel.
-    @objc public var dismissalTapGestureRecognizer: UITapGestureRecognizer!
+    ///
+    /// By default, this gesture recognizer is disabled as following the default behavior of iOS modalities.
+    /// To dismiss a panel by tap gestures on the backdrop, `dismissalTapGestureRecognizer.isEnabled` is set to true.
+    @objc public var dismissalTapGestureRecognizer: UITapGestureRecognizer
+
+    public init() {
+        dismissalTapGestureRecognizer = UITapGestureRecognizer()
+        dismissalTapGestureRecognizer.isEnabled = false
+        super.init(frame: .zero)
+        addGestureRecognizer(dismissalTapGestureRecognizer)
+    }
+
+    required public init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
 }

Sources/Behavior.swift

@@ -25,12 +25,16 @@ public protocol FloatingPanelBehavior {
     @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.
+    /// Asks the behavior if a panel should project a momentum of a user interaction to move the 
+    /// proposed state.
     ///
-    /// 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`.
+    /// The default implementation of this method returns `false`. This method is called for called
+    /// for all states defined by the current layout object.
     @objc optional
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool
+    func shouldProjectMomentum(
+        _ fpc: FloatingPanelController,
+        to proposedState: FloatingPanelState
+    ) -> Bool
 
     /// Returns the progress to redirect to the previous position.
     ///

Sources/Controller.swift

@@ -1,6 +1,7 @@
 // Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
 
 import UIKit
+import os.log
 
 /// A set of methods implemented by the delegate of a panel controller allows the adopting delegate to respond to
 /// messages from the FloatingPanelController class and thus respond to, and in some affect, operations such as
@@ -37,9 +38,9 @@ import UIKit
     @objc optional
     func floatingPanelShouldBeginDragging(_ fpc: FloatingPanelController) -> Bool
 
-    /// Called when the user drags the surface or the surface is attracted to a state anchor.
+    /// Called while the user drags the surface or the surface moves to a state anchor.
     @objc optional
-    func floatingPanelDidMove(_ fpc: FloatingPanelController) // any surface frame changes in dragging
+    func floatingPanelDidMove(_ fpc: FloatingPanelController)
 
     /// Called on start of dragging (may require some time and or distance to move)
     @objc optional
@@ -51,7 +52,12 @@ import UIKit
 
     /// Called on finger up if the user dragged.
     ///
-    /// If `attract` is true, it will continue moving afterwards to a nearby state anchor.
+    /// If `attract` is true, the panel continues moving towards the nearby state
+    /// anchor. Otherwise, it stops at the closest state anchor.
+    ///
+    /// - Note: If `attract` is false, ``FloatingPanelController.state`` property has
+    ///   already changed to the closest anchor's state by the time this delegate method
+    ///   is called.
     @objc optional
     func floatingPanelDidEndDragging(_ fpc: FloatingPanelController, willAttract attract: Bool)
 
@@ -90,6 +96,35 @@ import UIKit
     @objc(floatingPanel:contentOffsetForPinningScrollView:)
     optional
     func floatingPanel(_ fpc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint
+
+    /// Returns a Boolean value that determines whether the tracking scroll view should
+    /// scroll or not
+    ///
+    ///
+    /// If you return true, the scroll content scrolls when its scroll position is not
+    /// at the top of the content. If the delegate doesn’t implement this method, its
+    /// content can be scrolled only in the most expanded state.
+    ///
+    /// Basically, the decision to scroll is based on the `state` property like the
+    /// following code.
+    /// ```swift
+    /// func floatingPanel(
+    ///     _ fpc: FloatingPanelController,
+    ///     shouldAllowToScroll scrollView: UIScrollView,
+    ///     in state: FloatingPanelState
+    /// ) -> Bool {
+    ///     return state == .full || state == .half
+    /// }
+    /// ```
+    ///
+    /// - Attention: It is recommended that this method always returns the most expanded state(i.e.
+    /// .full). If it excludes the state, the panel might do unexpected behaviors.
+    @objc(floatingPanel:shouldAllowToScroll:in:)
+    optional func floatingPanel(
+        _ fpc: FloatingPanelController,
+        shouldAllowToScroll scrollView: UIScrollView,
+        in state: FloatingPanelState
+    ) -> Bool
 }
 
 ///
@@ -114,7 +149,7 @@ open class FloatingPanelController: UIViewController {
     }
 
     /// The delegate of a panel controller object.
-    @objc 
+    @objc
     public weak var delegate: FloatingPanelControllerDelegate?{
         didSet{
             didUpdateDelegate()
@@ -123,14 +158,15 @@ open class FloatingPanelController: UIViewController {
 
     /// Returns the surface view managed by the controller object. It's the same as `self.view`.
     @objc
-    public var surfaceView: SurfaceView! {
+    public var surfaceView: SurfaceView {
         return floatingPanel.surfaceView
     }
 
     /// Returns the backdrop view managed by the controller object.
     @objc
-    public var backdropView: BackdropView! {
-        return floatingPanel.backdropView
+    public var backdropView: BackdropView {
+        set { floatingPanel.backdropView = newValue }
+        get { return floatingPanel.backdropView }
     }
 
     /// Returns the scroll view that the controller tracks.
@@ -167,7 +203,8 @@ open class FloatingPanelController: UIViewController {
         set {
             _layout = newValue
             if let parent = parent, let layout = newValue as? UIViewController, layout == parent {
-                log.warning("A memory leak will occur by a retain cycle because \(self) owns the parent view controller(\(parent)) as the layout object. Don't let the parent adopt FloatingPanelLayout.")
+                let log = "Warning: A memory leak occurs due to a retain cycle, as \(self) owns the parent view controller(\(parent)) as its layout object. Don't allow the parent to adopt FloatingPanelLayout."
+                os_log(msg, log: sysLog, type: .error, log)
             }
         }
     }
@@ -179,7 +216,8 @@ open class FloatingPanelController: UIViewController {
         set {
             _behavior = newValue
             if let parent = parent, let behavior = newValue as? UIViewController, behavior == parent {
-                log.warning("A memory leak will occur by a retain cycle because \(self) owns the parent view controller(\(parent)) as the behavior object. Don't let the parent adopt FloatingPanelBehavior.")
+                let log = "Warning: A memory leak occurs due to a retain cycle, as \(self) owns the parent view controller(\(parent)) as its behavior object. Don't allow the parent to adopt FloatingPanelBehavior."
+                os_log(msg, log: sysLog, type: .error, log)
             }
         }
     }
@@ -193,7 +231,7 @@ 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.
@@ -213,7 +251,7 @@ open class FloatingPanelController: UIViewController {
     /// The NearbyState determines that finger's nearby state.
     public var nearbyState: FloatingPanelState {
         let currentY = surfaceLocation.y
-        return floatingPanel.targetPosition(from: currentY, with: .zero)
+        return floatingPanel.targetState(from: currentY, with: .zero)
     }
 
     /// Constants that define how a panel content fills in the surface.
@@ -293,19 +331,19 @@ open class FloatingPanelController: UIViewController {
 
     open override func viewDidLayoutSubviews() {
         super.viewDidLayoutSubviews()
-        if #available(iOS 11.0, *) {
-            // Ensure to update the static constraint of a panel after rotating a device in static mode
-            if contentMode == .static {
-                floatingPanel.layoutAdapter.updateStaticConstraint()
-            }
-        } else {
-            // Because {top,bottom}LayoutGuide is managed as a view
-            if floatingPanel.isAttracting == false {
-                self.update(safeAreaInsets: fp_safeAreaInsets)
-            }
+        // Ensure to update the static constraint of a panel after rotating a device in static mode
+        if contentMode == .static {
+            floatingPanel.layoutAdapter.updateStaticConstraint()
         }
     }
 
+    open override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        // Need to call this method just after the view appears, as the safe area is not
+        // correctly set before this time, for example, `show(animated:completion:)`.
+        floatingPanel.adjustScrollContentInsetIfNeeded()
+    }
+
     open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
         super.viewWillTransition(to: size, with: coordinator)
 
@@ -316,7 +354,7 @@ open class FloatingPanelController: UIViewController {
         // Change a layout for the new view size
         if let newLayout = self.delegate?.floatingPanel?(self, layoutFor: size) {
             layout = newLayout
-            activateLayout(forceLayout: false)
+            activateLayout(forceLayout: true)
         }
 
         if view.translatesAutoresizingMaskIntoConstraints {
@@ -335,7 +373,7 @@ open class FloatingPanelController: UIViewController {
         // Change a layout for the new trait collection
         if let newLayout = self.delegate?.floatingPanel?(self, layoutFor: newCollection) {
             self.layout = newLayout
-            activateLayout(forceLayout: false)
+            activateLayout(forceLayout: true)
         }
     }
 
@@ -375,7 +413,7 @@ open class FloatingPanelController: UIViewController {
             preSafeAreaInsets != safeAreaInsets
             else { return }
 
-        log.debug("Update safeAreaInsets", safeAreaInsets)
+        os_log(msg, log: devLog, type: .debug, "Update safeAreaInsets = \(safeAreaInsets)")
 
         // Prevent an infinite loop on iOS 10: setUpLayout() -> viewDidLayoutSubviews() -> setUpLayout()
         preSafeAreaInsets = safeAreaInsets
@@ -387,6 +425,7 @@ open class FloatingPanelController: UIViewController {
         }
 
         floatingPanel.layoutAdapter.updateStaticConstraint()
+        floatingPanel.adjustScrollContentInsetIfNeeded()
 
         if let contentOffset = contentOffset {
             trackingScrollView?.contentOffset = contentOffset
@@ -401,8 +440,10 @@ open class FloatingPanelController: UIViewController {
     }
 
     private func activateLayout(forceLayout: Bool = false) {
-        floatingPanel.activateLayout(forceLayout: forceLayout,
-                                     contentInsetAdjustmentBehavior: contentInsetAdjustmentBehavior)
+        floatingPanel.activateLayout(
+            forceLayout: forceLayout,
+            contentInsetAdjustmentBehavior: contentInsetAdjustmentBehavior
+        )
     }
 
     func remove() {
@@ -412,8 +453,15 @@ open class FloatingPanelController: UIViewController {
                 guard let self = self else { return }
                 self.delegate?.floatingPanelDidRemove?(self)
             }
-        } else {
+        } else if parent != nil {
             removePanelFromParent(animated: true)
+        } else {
+            delegate?.floatingPanelWillRemove?(self)
+            hide(animated: true) { [weak self] in
+                guard let self = self else { return }
+                self.view.removeFromSuperview()
+                self.delegate?.floatingPanelDidRemove?(self)
+            }
         }
     }
 
@@ -428,22 +476,23 @@ open class FloatingPanelController: UIViewController {
         // Must apply the current layout here
         activateLayout(forceLayout: true)
 
-        if #available(iOS 11.0, *) {
-            // Must track the safeAreaInsets of `self.view` to update the layout.
-            // There are 2 reasons.
-            // 1. This or the parent VC doesn't call viewSafeAreaInsetsDidChange() on the bottom
-            // inset's update expectedly.
-            // 2. The safe area top inset can be variable on the large title navigation bar(iOS11+).
-            // That's why it needs the observation to keep `adjustedContentInsets` correct.
-            safeAreaInsetsObservation = self.view.observe(\.safeAreaInsets, options: [.initial, .new, .old]) { [weak self] (_, change) in
-                // Use `self.view.safeAreaInsets` because `change.newValue` can be nil in particular case when
-                // is reported in https://github.com/SCENEE/FloatingPanel/issues/330
-                guard let self = self, change.oldValue != self.view.safeAreaInsets else { return }
-                self.update(safeAreaInsets: self.view.safeAreaInsets)
-            }
-        } else {
-            // KVOs for topLayoutGuide & bottomLayoutGuide are not effective.
-            // Instead, update(safeAreaInsets:) is called at `viewDidLayoutSubviews()`
+        // Must track the safeAreaInsets of `self.view` to update the layout.
+        // There are 2 reasons.
+        // 1. This or the parent VC doesn't call viewSafeAreaInsetsDidChange() on the bottom
+        // inset's update expectedly.
+        // 2. The safe area top inset can be variable on the large title navigation bar(iOS11+).
+        // That's why it needs the observation to keep `adjustedContentInsets` correct.
+        safeAreaInsetsObservation = self.view.observe(\.safeAreaInsets, options: [.initial, .new, .old]) { [weak self] (_, change) in
+            // Use `self.view.safeAreaInsets` because `change.newValue` can be nil in particular case when
+            // is reported in https://github.com/SCENEE/FloatingPanel/issues/330
+            guard let self = self, change.oldValue != self.view.safeAreaInsets else { return }
+
+            // Sometimes the bounding rectangle of the controlled view becomes invalid when the screen is rotated.
+            // This results in its safeAreaInsets change. In that case, `self.update(safeAreaInsets:)` leads
+            // an unsatisfied constraints error. So this method should not be called with those bounds.
+            guard self.view.bounds.height > 0 && self.view.bounds.width > 0 else { return }
+
+            self.update(safeAreaInsets: self.view.safeAreaInsets)
         }
 
         move(to: floatingPanel.layoutAdapter.initialState,
@@ -468,7 +517,7 @@ open class FloatingPanelController: UIViewController {
     @objc(addPanelToParent:at:animated:completion:)
     public func addPanel(toParent parent: UIViewController, at viewIndex: Int = -1, animated: Bool = false, completion: (() -> Void)? = nil) {
         guard self.parent == nil else {
-            log.warning("Already added to a parent(\(parent))")
+            os_log(msg, log: sysLog, type: .error, "Warning: already added to a parent(\(parent))")
             return
         }
         assert((parent is UINavigationController) == false, "UINavigationController displays only one child view controller at a time.")
@@ -575,18 +624,22 @@ open class FloatingPanelController: UIViewController {
 
         switch contentInsetAdjustmentBehavior {
         case .always:
-            if #available(iOS 11.0, *) {
-                scrollView.contentInsetAdjustmentBehavior = .never
-            } else {
-                children.forEach { (vc) in
-                    vc.automaticallyAdjustsScrollViewInsets = false
-                }
-            }
+            scrollView.contentInsetAdjustmentBehavior = .never
         default:
             break
         }
     }
 
+    /// [Experimental] Allows the panel to move as its tracking scroll view bounces.
+    ///
+    /// This method must be called in the delegate method, `UIScrollViewDelegate.scrollViewDidScroll(_:)`,
+    /// of its tracking scroll view. This method only supports a bottom positioned panel for now.
+    ///
+    /// - TODO: Support top, left and right positioned panels.
+    public func followScrollViewBouncing() {
+        floatingPanel.followScrollViewBouncing()
+    }
+
     /// Cancel tracking the specify scroll view.
     ///
     @objc(untrackScrollView:)
@@ -674,30 +727,31 @@ extension FloatingPanelController {
     }
 }
 
+// MARK: - Swizzling
+
+private var originalDismissImp: IMP?
+private typealias DismissFunction = @convention(c) (AnyObject, Selector, Bool, (() -> Void)?) -> Void
 extension FloatingPanelController {
     private static let dismissSwizzling: Void = {
+        guard originalDismissImp == nil else { return }
         let aClass: AnyClass! = UIViewController.self //object_getClass(vc)
-        if let imp = class_getMethodImplementation(aClass, #selector(dismiss(animated:completion:))),
-            let originalAltMethod = class_getInstanceMethod(aClass, #selector(fp_original_dismiss(animated:completion:))) {
-            method_setImplementation(originalAltMethod, imp)
-        }
-        let originalMethod = class_getInstanceMethod(aClass, #selector(dismiss(animated:completion:)))
-        let swizzledMethod = class_getInstanceMethod(aClass, #selector(fp_dismiss(animated:completion:)))
-        if let originalMethod = originalMethod, let swizzledMethod = swizzledMethod {
-            method_exchangeImplementations(originalMethod, swizzledMethod)
+        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)
         }
     }()
 }
 
-public extension UIViewController {
-    @objc func fp_original_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
-        // Implementation will be replaced by IMP of self.dismiss(animated:completion:)
-    }
-    @objc func fp_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+extension UIViewController {
+    @objc
+    fileprivate func __swizzled_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+        let dismissImp = unsafeBitCast(originalDismissImp, to: DismissFunction.self)
+        let sel = #selector(UIViewController.dismiss(animated:completion:))
+
         // Call dismiss(animated:completion:) to a content view controller
         if let fpc = parent as? FloatingPanelController {
             if fpc.presentingViewController != nil {
-                self.fp_original_dismiss(animated: flag, completion: completion)
+                dismissImp(self, sel, flag, completion)
             } else {
                 fpc.removePanelFromParent(animated: flag, completion: completion)
             }
@@ -707,7 +761,7 @@ public extension UIViewController {
         if let fpc = self as? FloatingPanelController {
             // When a panel is presented modally and it's not a child view controller of the presented view controller.
             if fpc.presentingViewController != nil, fpc.parent == nil {
-                self.fp_original_dismiss(animated: flag, completion: completion)
+                dismissImp(self, sel, flag, completion)
             } else {
                 fpc.removePanelFromParent(animated: flag, completion: completion)
             }
@@ -715,6 +769,6 @@ public extension UIViewController {
         }
 
         // For other view controllers
-        self.fp_original_dismiss(animated: flag, completion: completion)
+        dismissImp(self, sel, flag, completion)
     }
 }

Sources/Extensions.swift

@@ -7,10 +7,12 @@ import UIKit
 extension CGFloat {
     /// Returns this value rounded to an logical pixel value by a display scale
     func rounded(by displayScale: CGFloat) -> CGFloat {
-        return (self * displayScale).rounded(.toNearestOrAwayFromZero) / displayScale
+        let p = CGFloat(1.0e9)
+        let v = (self * p).rounded(.towardZero) / p
+        return (v * displayScale).rounded(.toNearestOrAwayFromZero) / displayScale
     }
     func isEqual(to: CGFloat, on displayScale: CGFloat) -> Bool {
-        return self.rounded(by: displayScale) == to.rounded(by: displayScale)
+        return rounded(by: displayScale) == to.rounded(by: displayScale)
     }
 }
 
@@ -45,65 +47,16 @@ protocol LayoutGuideProvider {
 extension UILayoutGuide: LayoutGuideProvider {}
 extension UIView: LayoutGuideProvider {}
 
-private class CustomLayoutGuide: LayoutGuideProvider {
-    let topAnchor: NSLayoutYAxisAnchor
-    let leftAnchor: NSLayoutXAxisAnchor
-    let bottomAnchor: NSLayoutYAxisAnchor
-    let rightAnchor: NSLayoutXAxisAnchor
-    let widthAnchor: NSLayoutDimension
-    let heightAnchor: NSLayoutDimension
-    init(topAnchor: NSLayoutYAxisAnchor,
-         leftAnchor: NSLayoutXAxisAnchor,
-         bottomAnchor: NSLayoutYAxisAnchor,
-         rightAnchor: NSLayoutXAxisAnchor,
-         widthAnchor: NSLayoutDimension,
-         heightAnchor: NSLayoutDimension) {
-        self.topAnchor = topAnchor
-        self.leftAnchor = leftAnchor
-        self.bottomAnchor = bottomAnchor
-        self.rightAnchor = rightAnchor
-        self.widthAnchor = widthAnchor
-        self.heightAnchor = heightAnchor
-    }
-}
-
 extension UIViewController {
+    /// The proxy property to be used in `LayoutAdapter`
+    ///
+    /// This property is to allow the safe area inset to change in unit testing
     @objc var fp_safeAreaInsets: UIEdgeInsets {
-        if #available(iOS 11.0, *) {
-            return view.safeAreaInsets
-        } else {
-            return UIEdgeInsets(top: topLayoutGuide.length,
-                                left: 0.0,
-                                bottom: bottomLayoutGuide.length,
-                                right: 0.0)
-        }
-    }
-
-    var fp_safeAreaLayoutGuide: LayoutGuideProvider {
-        if #available(iOS 11.0, *) {
-            return view!.safeAreaLayoutGuide
-        } 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 view.safeAreaInsets
     }
 }
 
-// The reason why UIView has no extensions of safe area insets and top/bottom guides
-// is for iOS10 compatibility.
 extension UIView {
-    var fp_safeAreaLayoutGuide: LayoutGuideProvider {
-        if #available(iOS 11.0, *) {
-            return safeAreaLayoutGuide
-        } else {
-            return self
-        }
-    }
-
     var presentationFrame: CGRect {
         return layer.presentation()?.frame ?? frame
     }
@@ -139,7 +92,7 @@ extension UIView {
     }
 }
 
-#if __FP_LOG
+#if FP_LOG
 extension UIGestureRecognizer.State: CustomDebugStringConvertible {
     public var debugDescription: String {
         switch self {
@@ -156,19 +109,9 @@ extension UIGestureRecognizer.State: CustomDebugStringConvertible {
 #endif
 
 extension UIScrollView {
-    var isLocked: Bool {
-        return !showsVerticalScrollIndicator && !bounces &&  isDirectionalLockEnabled
-    }
-    var fp_contentInset: UIEdgeInsets {
-        if #available(iOS 11.0, *) {
-            return adjustedContentInset
-        } else {
-            return contentInset
-        }
-    }
     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 + adjustedContentInset.right) - bounds.width, 0.0),
+                       y: max((contentSize.height + adjustedContentInset.bottom) - bounds.height, 0.0))
     }
 }
 

Sources/FloatingPanel.docc/FloatingPanel.md

@@ -1,11 +1,12 @@
 # ``FloatingPanel``
 
-The new interface displays the related contents and utilities in parallel as a user wants.
+Create a user interface to display the related content and utilities alongside the main content.
 
 ## Overview
 
-FloatingPanel is a simple and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app.
-The new interface displays the related contents and utilities in parallel as a user wants.
+
+FloatingPanel is a simple and easy-to-use UI component designed for a user interface featured in the Apple Maps, Shortcuts and Stocks app.
+The user interface displays related content and utilities alongside the main content.
 
 
 ## Topics
@@ -44,6 +45,7 @@ The new interface displays the related contents and utilities in parallel as a u
 - ``FloatingPanelPosition``
 - ``FloatingPanelReferenceEdge``
 - ``FloatingPanelLayoutReferenceGuide``
+- ``FloatingPanelLayoutContentBoundingGuide``
 
 ### Behaviors
 

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.5.3</string>
+	<string>2.8.3</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 </dict>

Sources/Layout.swift

@@ -1,6 +1,7 @@
 // Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
 
 import UIKit
+import os.log
 
 /// An interface for generating layout information for a panel.
 @objc public protocol FloatingPanelLayout {
@@ -44,8 +45,8 @@ open class FloatingPanelBottomLayout: NSObject, FloatingPanelLayout {
 
     open func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
         return [
-            surfaceView.leftAnchor.constraint(equalTo: view.fp_safeAreaLayoutGuide.leftAnchor, constant: 0.0),
-            surfaceView.rightAnchor.constraint(equalTo: view.fp_safeAreaLayoutGuide.rightAnchor, constant: 0.0),
+            surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
+            surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
         ]
     }
 
@@ -92,6 +93,9 @@ class LayoutAdapter {
 
     private var staticConstraint: NSLayoutConstraint?
 
+    /// A layout constraint to limit the content size in ``FloatingPanelAdaptiveLayoutAnchor``.
+    private var contentBoundingConstraint: NSLayoutConstraint?
+
     private var anchorStates: Set<FloatingPanelState> {
         return Set(layout.anchors.keys)
     }
@@ -262,12 +266,25 @@ class LayoutAdapter {
     }
 
     var offsetFromMostExpandedAnchor: CGFloat {
+        return offset(from: mostExpandedState)
+    }
+
+    /// The distance from the given state position to the current surface location.
+    ///
+    /// If the returned value is positive, it indicates that the surface is moving from
+    /// the given state position to closer to the `hidden` state position. In other
+    /// words, the surface is within the given state position. Otherwise, it indicates
+    /// that the surface is outside this position and is moving away from the `hidden`
+    /// state position.
+    func offset(from state: FloatingPanelState) -> CGFloat {
+        let offset: CGFloat
         switch position {
         case .top, .left:
-            return edgePosition(surfaceView.presentationFrame) - position(for: mostExpandedState)
+            offset = position(for: state) - edgePosition(surfaceView.frame)
         case .bottom, .right:
-            return position(for: mostExpandedState) - edgePosition(surfaceView.presentationFrame)
+            offset = edgePosition(surfaceView.frame) - position(for: state)
         }
+        return offset.rounded(by: surfaceView.fp_displayScale)
     }
 
     private var hiddenAnchor: FloatingPanelLayoutAnchoring {
@@ -330,12 +347,27 @@ class LayoutAdapter {
                 if anchor.referenceGuide == .safeArea {
                     referenceBoundsLength += position.inset(safeAreaInsets)
                 }
-                return dimension - diff
+                let maxPosition: CGFloat = {
+                    if let maxBounds = anchor.contentBoundingGuide.maxBounds(vc) {
+                        return layout.position.mainLocation(maxBounds.origin)
+                            + layout.position.mainDimension(maxBounds.size)
+                    } else {
+                        return .infinity
+                    }
+                }()
+                return min(dimension - diff, maxPosition)
             case .bottom, .right:
                 if anchor.referenceGuide == .safeArea {
                     referenceBoundsLength -= position.inset(safeAreaInsets)
                 }
-                return referenceBoundsLength - dimension + diff
+                let minPosition: CGFloat = {
+                    if let maxBounds = anchor.contentBoundingGuide.maxBounds(vc) {
+                        return layout.position.mainLocation(maxBounds.origin)
+                    } else {
+                        return -(.infinity)
+                    }
+                }()
+                return max(referenceBoundsLength - dimension + diff, minPosition)
             }
         case let anchor as FloatingPanelLayoutAnchor:
             let referenceBounds = anchor.referenceGuide == .safeArea ? bounds.inset(by: safeAreaInsets) : bounds
@@ -403,13 +435,13 @@ class LayoutAdapter {
             switch position {
             case .top, .bottom:
                 surfaceConstraints = [
-                    surfaceView.leftAnchor.constraint(equalTo: vc.fp_safeAreaLayoutGuide.leftAnchor, constant: 0.0),
-                    surfaceView.rightAnchor.constraint(equalTo: vc.fp_safeAreaLayoutGuide.rightAnchor, constant: 0.0),
+                    surfaceView.leftAnchor.constraint(equalTo: vc.view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
+                    surfaceView.rightAnchor.constraint(equalTo: vc.view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
                 ]
             case .left, .right:
                 surfaceConstraints = [
-                    surfaceView.topAnchor.constraint(equalTo: vc.fp_safeAreaLayoutGuide.topAnchor, constant: 0.0),
-                    surfaceView.bottomAnchor.constraint(equalTo: vc.fp_safeAreaLayoutGuide.bottomAnchor, constant: 0.0),
+                    surfaceView.topAnchor.constraint(equalTo: vc.view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
+                    surfaceView.bottomAnchor.constraint(equalTo: vc.view.safeAreaLayoutGuide.bottomAnchor, constant: 0.0),
                 ]
             }
         }
@@ -517,7 +549,7 @@ class LayoutAdapter {
         let layoutGuideProvider: LayoutGuideProvider
         switch anchor.referenceGuide {
         case .safeArea:
-            layoutGuideProvider = vc.fp_safeAreaLayoutGuide
+            layoutGuideProvider = vc.view.safeAreaLayoutGuide
         case .superview:
             layoutGuideProvider = vc.view
         }
@@ -629,8 +661,9 @@ class LayoutAdapter {
     // The method is separated from prepareLayout(to:) for the rotation support
     // It must be called in FloatingPanelController.traitCollectionDidChange(_:)
     func updateStaticConstraint() {
-        NSLayoutConstraint.deactivate(constraint: staticConstraint)
+        NSLayoutConstraint.deactivate([staticConstraint, contentBoundingConstraint].compactMap{ $0 })
         staticConstraint = nil
+        contentBoundingConstraint = nil
 
         if vc.contentMode == .fitToBounds {
             surfaceView.containerOverflow = 0
@@ -654,7 +687,18 @@ class LayoutAdapter {
                 constant = 0.0
             }
             let baseAnchor = position.mainDimensionAnchor(anchor.contentLayoutGuide)
-            staticConstraint = surfaceAnchor.constraint(equalTo: baseAnchor, constant: constant)
+            if let boundingLayoutGuide = anchor.contentBoundingGuide.layoutGuide(vc) {
+                if anchor.isAbsolute {
+                    contentBoundingConstraint = baseAnchor.constraint(lessThanOrEqualTo: position.mainDimensionAnchor(boundingLayoutGuide),
+                                                               constant: anchor.offset)
+                } else {
+                    contentBoundingConstraint = baseAnchor.constraint(lessThanOrEqualTo: position.mainDimensionAnchor(boundingLayoutGuide),
+                                                               multiplier: anchor.offset)
+                }
+                staticConstraint = surfaceAnchor.constraint(lessThanOrEqualTo: baseAnchor, constant: constant)
+            } else {
+                staticConstraint = surfaceAnchor.constraint(equalTo: baseAnchor, constant: constant)
+            }
         default:
             switch position {
             case .top, .left:
@@ -673,14 +717,14 @@ class LayoutAdapter {
             staticConstraint?.identifier = "FloatingPanel-static-width"
         }
 
-        NSLayoutConstraint.activate(constraint: staticConstraint)
+        NSLayoutConstraint.activate([staticConstraint, contentBoundingConstraint].compactMap{ $0 })
 
         surfaceView.containerOverflow = position.mainDimension(vc.view.bounds.size)
     }
 
     func updateInteractiveEdgeConstraint(diff: CGFloat, scrollingContent: Bool, allowsRubberBanding: (UIRectEdge) -> Bool) {
         defer {
-            log.debug("update surface location = \(surfaceLocation)")
+            os_log(msg, log: devLog, type: .debug, "update surface location = \(surfaceLocation)")
         }
 
         let minConst: CGFloat = position(for: leastCoordinateState)
@@ -720,9 +764,9 @@ class LayoutAdapter {
         defer {
             if forceLayout {
                 layoutSurfaceIfNeeded()
-                log.debug("activateLayout for \(state) -- surface.presentation = \(self.surfaceView.presentationFrame) surface.frame = \(self.surfaceView.frame)")
+                os_log(msg, log: devLog, type: .debug, "activateLayout for \(state) -- surface.presentation = \(self.surfaceView.presentationFrame) surface.frame = \(self.surfaceView.frame)")
             } else {
-                log.debug("activateLayout for \(state)")
+                os_log(msg, log: devLog, type: .debug, "activateLayout for \(state)")
             }
         }
 
@@ -738,12 +782,6 @@ class LayoutAdapter {
             NSLayoutConstraint.activate(constraint: self.fitToBoundsConstraint)
         }
 
-        var state = state
-
-        if validStates.contains(state) == false {
-            state = layout.initialState
-        }
-
         // Recalculate the intrinsic size of a content view. This is because
         // UIView.systemLayoutSizeFitting() returns a different size between an
         // on-screen and off-screen view which includes
@@ -757,7 +795,7 @@ class LayoutAdapter {
             if let constraints = stateConstraints[state] {
                 NSLayoutConstraint.activate(constraints)
             } else {
-                log.error("Couldn't find any constraints for \(state)")
+                os_log(msg, log: sysLog, type: .fault, "Error: can not find any constraints for \(state)")
             }
         }
     }

Sources/LayoutAnchoring.swift

@@ -15,6 +15,11 @@ import UIKit
     ///
     /// The inset is an amount to inset a panel from an edge of the reference guide.  The edge refers to a panel
     /// positioning.
+    ///
+    /// - Parameters:
+    ///     - absoluteOffset: An absolute offset to attach the panel from the edge.
+    ///     - edge: Specify the edge of ``FloatingPanelController``'s view. This is the staring point of the offset.
+    ///     - referenceGuide: The rectangular area to lay out the content. If it's set to `.safeArea`, the panel content lays out inside the safe area of its ``FloatingPanelController``'s view.
     @objc public init(absoluteInset: CGFloat, edge: FloatingPanelReferenceEdge, referenceGuide: FloatingPanelLayoutReferenceGuide) {
         self.inset = absoluteInset
         self.referenceGuide = referenceGuide
@@ -27,6 +32,11 @@ import UIKit
     /// The inset is an amount to inset a panel from the edge of the specified reference guide. The value is
     /// a floating-point number in the range 0.0 to 1.0, where 0.0 represents zero distance from the edge and
     /// 1.0 represents a distance to the opposite edge.
+    ///
+    /// - Parameters:
+    ///     - fractionalOffset: A fractional value of the size of ``FloatingPanelController``'s view to attach the panel from the edge.
+    ///     - edge: Specify the edge of ``FloatingPanelController``'s view. This is the staring point of the offset.
+    ///     - referenceGuide: The rectangular area to lay out the content. If it's set to `.safeArea`, the panel content lays out inside the safe area of its ``FloatingPanelController``'s view.
     @objc public init(fractionalInset: CGFloat, edge: FloatingPanelReferenceEdge, referenceGuide: FloatingPanelLayoutReferenceGuide) {
         self.inset = fractionalInset
         self.referenceGuide = referenceGuide
@@ -49,7 +59,7 @@ public extension FloatingPanelLayoutAnchor {
         case .left:
             return layoutConstraints(layoutGuide, for: vc.surfaceView.rightAnchor)
         case .bottom:
-            return layoutConstraints(layoutGuide, for:  vc.surfaceView.topAnchor)
+            return layoutConstraints(layoutGuide, for: vc.surfaceView.topAnchor)
         case .right:
             return layoutConstraints(layoutGuide, for: vc.surfaceView.leftAnchor)
         }
@@ -101,6 +111,10 @@ public extension FloatingPanelLayoutAnchor {
     ///
     /// The offset is an amount to offset a position of panel that displays the entire content from an edge of
     /// the reference guide.  The edge refers to a panel positioning.
+    ///
+    /// - Parameters:
+    ///     - absoluteOffset: An absolute offset from the content size in the main dimension(i.e. y axis for a bottom panel) to attach the panel.
+    ///     - referenceGuide: The rectangular area to lay out the content. If it's set to `.safeArea`, the panel content lays out inside the safe area of its ``FloatingPanelController``'s view.
     @objc public init(absoluteOffset offset: CGFloat, referenceGuide: FloatingPanelLayoutReferenceGuide = .safeArea) {
         self.offset = offset
         self.referenceGuide = referenceGuide
@@ -111,6 +125,10 @@ public extension FloatingPanelLayoutAnchor {
     ///
     /// The offset value is a floating-point number in the range 0.0 to 1.0, where 0.0 represents the full content
     /// is displayed and 0.5 represents the half of content is displayed.
+    ///
+    /// - Parameters:
+    ///     - fractionalOffset: A fractional offset of the content size in the main dimension(i.e. y axis for a bottom panel) to attach the panel.
+    ///     - referenceGuide: The rectangular area to lay out the content. If it's set to `.safeArea`, the panel content lays out inside the safe area of its ``FloatingPanelController``'s view.
     @objc public init(fractionalOffset offset: CGFloat, referenceGuide: FloatingPanelLayoutReferenceGuide = .safeArea) {
         self.offset = offset
         self.referenceGuide = referenceGuide
@@ -144,37 +162,72 @@ 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 */ {
 
-    /// Returns a layout anchor with the specified offset by an absolute value, layout guide to display content and reference guide for a panel.
+    /// Returns a layout anchor with the specified offset by an absolute value to display a panel with its intrinsic content size.
     ///
     /// The offset is an amount to offset a position of panel that displays the entire content of the specified guide from an edge of
     /// the reference guide.  The edge refers to a panel positioning.
-    @objc public init(absoluteOffset offset: CGFloat, contentLayout: UILayoutGuide, referenceGuide: FloatingPanelLayoutReferenceGuide = .safeArea) {
+    ///
+    ///  ``contentBoundingGuide`` restricts the content size which a panel displays. For example, given ``referenceGuide`` is `.superview` and ``contentBoundingGuide`` is `.safeArea` for a bottom positioned panel, the panel content is laid out inside the superview of the view of FloatingPanelController(not its safe area), but its content size is limited to its safe area size. Normally both of ``referenceGuide`` and ``contentBoundingGuide`` are specified with the same rectangle area.
+    ///
+    /// - Parameters:
+    ///     - absoluteOffset: An absolute offset from the content size in the main dimension(i.e. y axis for a bottom panel) to attach the panel.
+    ///     - contentLayout: The content layout guide to calculate the content size in the panel.
+    ///     - referenceGuide: The rectangular area to lay out the content of a panel. If it's set to `.safeArea`, the panel content displays inside the safe area of its ``FloatingPanelController``'s view. This argument doesn't limit its content size.
+    ///     - contentBoundingGuide: The rectangular area to restrict the content size of a panel in the main dimension(i.e. y axis is the main dimension for a bottom panel).
+    ///
+    /// - Warning: If ``contentBoundingGuide`` is set to none, the panel may expand out of the screen size, depending on the intrinsic size of its content.
+    @objc public init(
+        absoluteOffset offset: CGFloat,
+        contentLayout: UILayoutGuide,
+        referenceGuide: FloatingPanelLayoutReferenceGuide,
+        contentBoundingGuide: FloatingPanelLayoutContentBoundingGuide = .none
+    ) {
         self.offset = offset
         self.contentLayoutGuide = contentLayout
         self.referenceGuide = referenceGuide
+        self.contentBoundingGuide = contentBoundingGuide
         self.isAbsolute = true
-
     }
 
-    /// Returns a layout anchor with the specified offset by a fractional value, layout guide to display content and reference guide for a panel.
+    /// Returns a layout anchor with the specified offset by a fractional value to display a panel with its intrinsic content size.
     ///
     /// The offset value is a floating-point number in the range 0.0 to 1.0, where 0.0 represents the full content
     /// is displayed and 0.5 represents the half of content is displayed.
-    @objc public init(fractionalOffset offset: CGFloat, contentLayout: UILayoutGuide, referenceGuide: FloatingPanelLayoutReferenceGuide = .safeArea) {
+    ///
+    ///  ``contentBoundingGuide`` restricts the content size which a panel displays. For example, given ``referenceGuide`` is `.superview` and ``contentBoundingGuide`` is `.safeArea` for a bottom positioned panel, the panel content is laid out inside the superview of the view of FloatingPanelController(not its safe area), but its content size is limited to its safe area size. Normally both of ``referenceGuide`` and ``contentBoundingGuide`` are specified with the same rectangle area.
+    ///
+    /// - Parameters:
+    ///     - fractionalOffset: A fractional offset of the content size in the main dimension(i.e. y axis for a bottom panel) to attach the panel.
+    ///     - contentLayout: The content layout guide to calculate the content size in the panel.
+    ///     - referenceGuide: The rectangular area to lay out the content of a panel. If it's set to `.safeArea`, the panel content displays inside the safe area of its ``FloatingPanelController``'s view. This argument doesn't limit its content size.
+    ///     - contentBoundingGuide: The rectangular area to restrict the content size of a panel in the main dimension(i.e. y axis is the main dimension for a bottom panel).
+    ///
+    /// - Warning: If ``contentBoundingGuide`` is set to none, the panel may expand out of the screen size, depending on the intrinsic size of its content.
+    @objc public init(
+        fractionalOffset offset: CGFloat,
+        contentLayout: UILayoutGuide,
+        referenceGuide: FloatingPanelLayoutReferenceGuide,
+        contentBoundingGuide: FloatingPanelLayoutContentBoundingGuide = .none
+    ) {
         self.offset = offset
         self.contentLayoutGuide = contentLayout
         self.referenceGuide = referenceGuide
+        self.contentBoundingGuide = contentBoundingGuide
         self.isAbsolute = false
     }
-    fileprivate let offset: CGFloat
-    fileprivate let isAbsolute: Bool
+    let offset: CGFloat
+    let isAbsolute: Bool
     let contentLayoutGuide: UILayoutGuide
     @objc public let referenceGuide: FloatingPanelLayoutReferenceGuide
+    @objc public let contentBoundingGuide: FloatingPanelLayoutContentBoundingGuide
 }
 
 public extension FloatingPanelAdaptiveLayoutAnchor {
     func layoutConstraints(_ vc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint] {
+        var constraints = [NSLayoutConstraint]()
+
         let layoutGuide = referenceGuide.layoutGuide(vc: vc)
+        let offsetConstraint: NSLayoutConstraint
         let offsetAnchor: NSLayoutDimension
         switch position {
         case .top:
@@ -187,10 +240,13 @@ public extension FloatingPanelAdaptiveLayoutAnchor {
             offsetAnchor = vc.surfaceView.leftAnchor.anchorWithOffset(to: layoutGuide.rightAnchor)
         }
         if isAbsolute {
-            return [offsetAnchor.constraint(equalTo: position.mainDimensionAnchor(contentLayoutGuide), constant: -offset)]
+            offsetConstraint = offsetAnchor.constraint(equalTo: position.mainDimensionAnchor(contentLayoutGuide), constant: -offset)
         } else {
-            return [offsetAnchor.constraint(equalTo: position.mainDimensionAnchor(contentLayoutGuide), multiplier: (1 - offset))]
+            offsetConstraint = offsetAnchor.constraint(equalTo: position.mainDimensionAnchor(contentLayoutGuide), multiplier: (1 - offset))
         }
+        constraints.append(offsetConstraint)
+
+        return constraints
     }
 }
 

Sources/LayoutProperties.swift

@@ -27,7 +27,7 @@ extension FloatingPanelReferenceEdge {
     }
 }
 
-/// Constants that specify a layout guide to lay out a panel.
+/// A representation to specify a rectangular area to lay out a panel.
 @objc public enum FloatingPanelLayoutReferenceGuide: Int {
     case superview = 0
     case safeArea = 1
@@ -37,9 +37,40 @@ extension FloatingPanelLayoutReferenceGuide {
     func layoutGuide(vc: UIViewController) -> LayoutGuideProvider {
         switch self {
         case .safeArea:
-            return vc.fp_safeAreaLayoutGuide
+            return vc.view.safeAreaLayoutGuide
         case .superview:
             return vc.view
         }
     }
 }
+
+/// A representation to specify a bounding box which limit the content size of a panel.
+@objc public enum FloatingPanelLayoutContentBoundingGuide: Int {
+    case none = 0
+    case superview = 1
+    case safeArea = 2
+}
+
+extension FloatingPanelLayoutContentBoundingGuide {
+    func layoutGuide(_ fpc: FloatingPanelController) -> LayoutGuideProvider? {
+        switch self {
+        case .superview:
+            return fpc.view
+        case .safeArea:
+            return fpc.view.safeAreaLayoutGuide
+        case .none:
+            return nil
+        }
+    }
+    func maxBounds(_ fpc: FloatingPanelController) -> CGRect? {
+        switch self {
+        case .superview:
+            return fpc.view.bounds
+        case .safeArea:
+            return fpc.view.bounds.inset(by: fpc.fp_safeAreaInsets)
+        case .none:
+            return nil
+        }
+    }
+
+}

Sources/Logger.swift

@@ -1,100 +0,0 @@
-// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
-
-import Foundation
-import os.log
-
-// Must be a variable to use `hook` property in testing
-var log = {
-    return Logger()
-}()
-
-struct Logger {
-    private let osLog: OSLog
-    private let s = DispatchSemaphore(value: 1)
-
-    enum Level: Int, Comparable {
-        case debug = 0
-        case info = 1
-        case warning = 2
-        case error = 3
-
-        var displayName: String {
-            switch self {
-            case .debug:
-                return "Debug:"
-            case .info:
-                return "Info:"
-            case .warning:
-                return "Warning:"
-            case .error:
-                return "Error:"
-            }
-        }
-        @available(iOS 10.0, *)
-        var osLogType: OSLogType {
-            switch self {
-            case .debug: return .debug
-            case .info: return .info
-            case .warning: return .default
-            case .error: return .error
-            }
-        }
-
-        static func < (lhs: Logger.Level, rhs: Logger.Level) -> Bool {
-            return lhs.rawValue < rhs.rawValue
-        }
-    }
-
-    typealias Hook = ((String, Level) -> Void)
-    var hook: Hook?
-
-    fileprivate init() {
-        osLog = OSLog(subsystem: "com.scenee.FloatingPanel", category: "FloatingPanel")
-    }
-
-    private func log(_ level: Level, _ message: Any, _ arguments: [Any], tag: String, function: String, line: UInt) {
-        _ = s.wait(timeout: .now() + 0.033)
-        defer { s.signal() }
-
-        let extraMessage: String = arguments.map({ String(describing: $0) }).joined(separator: " ")
-        let _tag = tag.isEmpty ? "" : "\(tag):"
-        let log: String = {
-            switch level {
-            case .debug:
-                return "\(level.displayName)\(_tag) \(message) \(extraMessage) (\(function):\(line))"
-            default:
-                return "\(level.displayName)\(_tag) \(message) \(extraMessage)"
-            }
-        }()
-
-        hook?(log, level)
-
-        os_log("%{public}@", log: osLog, type: level.osLogType, log)
-    }
-
-    private func getPrettyFunction(_ function: String, _ file: String) -> String {
-        if let filename = file.split(separator: "/").last {
-            return filename + ":" + function
-        } else {
-            return file + ":" + function
-        }
-    }
-
-    func debug(_ log: Any, _ arguments: Any..., 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) {
-        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) {
-        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) {
-        self.log(.error, log, arguments, tag: "", function: getPrettyFunction(function, file), line: line)
-    }
-}

Sources/Logging.swift

@@ -0,0 +1,17 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import os.log
+
+let msg = StaticString("%{public}@")
+let sysLog = OSLog(subsystem: Logging.subsystem, category: Logging.category)
+#if FP_LOG
+let devLog = OSLog(subsystem: Logging.subsystem, category: "\(Logging.category):dev")
+#else
+let devLog = OSLog.disabled
+#endif
+
+struct Logging {
+    static let subsystem = "com.scenee.FloatingPanel"
+    static let category = "FloatingPanel"
+    private init() {}
+}

Sources/SurfaceView.swift

@@ -1,6 +1,7 @@
 // Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
 
 import UIKit
+import os.log
 
 /// An object for customizing the appearance of a surface view
 @objc(FloatingPanelSurfaceAppearance)
@@ -55,11 +56,11 @@ public class SurfaceAppearance: NSObject {
     /// Defaults to `.circular`.
     @available(iOS 13.0, *)
     public var cornerCurve: CALayerCornerCurve {
-        get { _cornerCurve ?? .circular }
+        get { _cornerCurve as? CALayerCornerCurve ?? .circular }
         set { _cornerCurve = newValue }
     }
 
-    private var _cornerCurve: CALayerCornerCurve?
+    private var _cornerCurve: Any?
 
     /// An array of shadows used to create drop shadows underneath a surface view.
     public var shadows: [Shadow] = [Shadow()]
@@ -318,7 +319,7 @@ public class SurfaceView: UIView {
 
     public override func layoutSubviews() {
         super.layoutSubviews()
-        log.debug("surface view frame = \(frame)")
+        os_log(msg, log: devLog, type: .debug, "surface view frame = \(frame)")
 
         containerView.backgroundColor = appearance.backgroundColor
 
@@ -382,29 +383,24 @@ 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
         }
-        if #available(iOS 11, *) {
-            // Don't use `contentView.clipToBounds` because it prevents content view from expanding the height of a subview of it
-            // for the bottom overflow like Auto Layout settings of UIVisualEffectView in Main.storyboard of Example/Maps.
-            // Because the bottom of contentView must be fit to the bottom of a screen to work the `safeLayoutGuide` of a content VC.
-            switch position {
-            case .top:
-                containerView.layer.maskedCorners = [.layerMinXMaxYCorner, .layerMaxXMaxYCorner]
-            case .left:
-                containerView.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMaxXMaxYCorner]
-            case .bottom:
-                containerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
-            case .right:
-                containerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMinXMaxYCorner]
-            }
-        } else {
-            // Can't use `containerView.layer.mask` because of a UIVisualEffectView issue in iOS 10, https://forums.developer.apple.com/thread/50854
-            // Instead, a user should display rounding corners appropriately.
+        // Don't use `contentView.clipToBounds` because it prevents content view from expanding the height of a subview of it
+        // for the bottom overflow like Auto Layout settings of UIVisualEffectView in Main.storyboard of Example/Maps.
+        // Because the bottom of contentView must be fit to the bottom of a screen to work the `safeLayoutGuide` of a content VC.
+        switch position {
+        case .top:
+            containerView.layer.maskedCorners = [.layerMinXMaxYCorner, .layerMaxXMaxYCorner]
+        case .left:
+            containerView.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMaxXMaxYCorner]
+        case .bottom:
+            containerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
+        case .right:
+            containerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMinXMaxYCorner]
         }
     }
 
@@ -422,12 +418,30 @@ public class SurfaceView: UIView {
         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([
+
+        var constraints = [
             topConstraint,
             leftConstraint,
             rightConstraint,
-            bottomConstraint,
-        ].map {
+            bottomConstraint
+        ]
+
+        // This constraint is for UICollectionView using UICollectionViewCompositionalLayout.
+        // It's seemingly obvious, but the UICollectionView doesn't work without setting it. (#628)
+        switch position {
+        case .top, .bottom:
+            constraints += [
+                heightAnchor.constraint(greaterThanOrEqualToConstant: 1.0)
+            ]
+        case .left, .right:
+            constraints += [
+                widthAnchor.constraint(greaterThanOrEqualToConstant: 1.0)
+            ]
+        }
+
+        NSLayoutConstraint.activate(
+            constraints
+            .map {
             switch mode {
             case .static:
                 $0.priority = .required

Sources/Transitioning.swift

@@ -99,15 +99,15 @@ class ModalPresentTransition: NSObject, UIViewControllerAnimatedTransitioning {
             return animator
         }
 
-        // Ensure the current(initial) state is hidden. Because `fpc.transitionAnimator` can be nil if not.
-        fpc.move(to: .hidden, animated: false)
-
         fpc.suspendTransitionAnimator(true)
         fpc.show(animated: true) { [weak fpc] in
             fpc?.suspendTransitionAnimator(false)
             transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
         }
-        return fpc.transitionAnimator!
+        guard let transitionAnimator = fpc.transitionAnimator else {
+            fatalError("The panel state must be `hidden` but it is `\(fpc.state)`")
+        }
+        return transitionAnimator
     }
 
     func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

Tests/ControllerTests.swift

@@ -1,5 +1,6 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
+import OSLog
 import XCTest
 @testable import FloatingPanel
 
@@ -7,22 +8,32 @@ class ControllerTests: XCTestCase {
     override func setUp() {}
     override func tearDown() {}
 
-    func test_warningRetainCycle() {
-        let exp = expectation(description: "Warning retain cycle")
-        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()
-            }
+#if swift(>=5.5)  // Avoid the 'No exact matches in call to initializer' build failure for OSLogStore when running this test case on iOS 13.7 using Xcode 12.5.1
+    func test_warningRetainCycle() throws {
+        guard #available(iOS 15.0, *) else {
+            throw XCTSkip("Unsupported iOS version: this test needs iOS 15 or later")
         }
         let myVC = MyZombieViewController(nibName: nil, bundle: nil)
         myVC.loadViewIfNeeded()
-        wait(for: [exp], timeout: 10)
+        let store = try OSLogStore(scope: .currentProcessIdentifier)
+        let found = try store
+            .getEntries(
+                at: store.position(timeIntervalSinceLatestBoot: 0),
+                matching: .init(format: "subsystem == '\(Logging.subsystem)'")
+            )
+            .contains {
+                $0.composedMessage.contains("A memory leak occurs due to a retain cycle, as")
+            }
+        XCTAssertTrue(found)
     }
+#endif
 
     func test_addPanel() {
-        guard let rootVC = UIApplication.shared.keyWindow?.rootViewController else { fatalError() }
+        let rootVC = UIViewController()
+        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)
@@ -30,8 +41,13 @@ class ControllerTests: XCTestCase {
         XCTAssertEqual(fpc.surfaceLocation.y, fpc.surfaceLocation(for: .tip).y)
     }
 
-    @available(iOS 12.0, *)
-    func test_updateLayout_willTransition() {
+    func test_updateLayout_willTransition() throws {
+        guard #available(iOS 12, *) else {
+            throw XCTSkip("Unsupported iOS version: this test needs iOS 12 or later")
+        }
+        if #available(iOS 17, *) {
+            throw XCTSkip("Unsupported iOS version: this test doesn't support iOS 17 or later")
+        }
         class MyDelegate: FloatingPanelControllerDelegate {
             func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
                 if newCollection.userInterfaceStyle == .dark {
@@ -314,11 +330,40 @@ class ControllerTests: XCTestCase {
         fpc.move(to: .full, animated: false)
         XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.surfaceLocation(for: .full).y)
         fpc.move(to: .half, animated: false)
-        print(1 / fpc.surfaceView.fp_displayScale)
         XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.surfaceLocation(for: .half).y)
         fpc.move(to: .tip, animated: false)
         XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.surfaceLocation(for: .tip).y)
     }
+
+    func test_switching_layout() {
+        final class FirstLayout: FloatingPanelLayout {
+            let position: FloatingPanelPosition = .bottom
+            let initialState: FloatingPanelState = .half
+            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+                .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea),
+                .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
+            ]
+        }
+        final class SecondLayout: FloatingPanelLayout {
+            let position: FloatingPanelPosition = .bottom
+            let initialState: FloatingPanelState = .half
+            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+                .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea)
+            ]
+        }
+        let fpc = FloatingPanelController()
+        fpc.layout = FirstLayout()
+        fpc.showForTest()
+
+        fpc.move(to: .tip, animated: false)
+
+        // Switch to another layout
+        fpc.layout = SecondLayout()
+        fpc.invalidateLayout()
+
+        XCTAssertEqual(fpc.state, .half)
+    }
 }
 
 private class MyZombieViewController: UIViewController, FloatingPanelLayout, FloatingPanelBehavior, FloatingPanelControllerDelegate {
@@ -336,8 +381,7 @@ private class MyZombieViewController: UIViewController, FloatingPanelLayout, Flo
         return .half
     }
 
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
             .full: FloatingPanelLayoutAnchor(absoluteInset: UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0,
                                              edge: .top,
                                              referenceGuide: .superview),
@@ -347,6 +391,5 @@ private class MyZombieViewController: UIViewController, FloatingPanelLayout, Flo
             .tip: FloatingPanelLayoutAnchor(absoluteInset: 60.0,
                                             edge: .bottom,
                                             referenceGuide: .superview),
-        ]
-    }
+    ]
 }

Tests/CoreTests.swift

@@ -7,7 +7,7 @@ class CoreTests: XCTestCase {
     override func setUp() {}
     override func tearDown() {}
 
-    func test_scrolllock() {
+    func test_scrollLock() {
         let fpc = FloatingPanelController()
 
         let contentVC1 = UITableViewController(nibName: nil, bundle: nil)
@@ -61,9 +61,8 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout1Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .full
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [.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()
@@ -106,12 +105,10 @@ class CoreTests: XCTestCase {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .half
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
-                    .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
-                ]
-            }
+            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
+                .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
+            ]
         }
 
         let delegate = FloatingPanelTestDelegate()
@@ -198,26 +195,41 @@ class CoreTests: XCTestCase {
                 }
             }
         }
-        let fpc = FloatingPanelController()
+        class BackdropTestLayout2: FloatingPanelTestLayout {
+            func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+                return 0.0
+            }
+        }
+        class TestDelegate: FloatingPanelControllerDelegate {
+            var layout: FloatingPanelLayout = BackdropTestLayout2()
+            func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout { layout }
+            func floatingPanel(_ fpc: FloatingPanelController, layoutFor size: CGSize) -> FloatingPanelLayout { layout }
+        }
+        func _floor(_ alpha: CGFloat) -> CGFloat {
+            return floor(fpc.backdropView.alpha * 1e+06) / 1e+06
+        }
+
+        let delegate = TestDelegate()
+        let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = BackdropTestLayout()
 
         fpc.showForTest()
 
         fpc.move(to: .full, animated: false)
-        XCTAssertEqual(floor(fpc.backdropView.alpha * 1000_000) / 1000_000, 0.3)
+        XCTAssertEqual(_floor(fpc.backdropView.alpha), 0.3)
 
         fpc.move(to: .half, animated: false)
         XCTAssertEqual(fpc.backdropView.alpha, 0.0)
 
         fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(floor(fpc.backdropView.alpha * 1000_000) / 1000_000, 0.3)
+        XCTAssertEqual(_floor(fpc.backdropView.alpha), 0.3)
 
         let exp1 = expectation(description: "move to full with animation")
         fpc.move(to: .full, animated: true) {
             exp1.fulfill()
         }
         wait(for: [exp1], timeout: 1.0)
-        XCTAssertEqual(floor(fpc.backdropView.alpha * 1000_000) / 1000_000, 0.3)
+        XCTAssertEqual(_floor(fpc.backdropView.alpha), 0.3)
 
         let exp2 = expectation(description: "move to half with animation")
         fpc.move(to: .half, animated: true) {
@@ -226,23 +238,66 @@ class CoreTests: XCTestCase {
         wait(for: [exp2], timeout: 1.0)
         XCTAssertEqual(fpc.backdropView.alpha, 0.0)
 
+        // Test a content mode change of FloatingPanelController
+
         let exp3 = expectation(description: "move to tip with animation")
         fpc.move(to: .tip, animated: true) {
             exp3.fulfill()
         }
         fpc.contentMode = .fitToBounds
-        XCTAssertEqual(fpc.backdropView.alpha, 0.0) // Must not affect the backdrop alpha by changing the content mode
+        XCTAssertEqual(fpc.backdropView.alpha, 0.0)  // Must not affect the backdrop alpha by changing the content mode
         wait(for: [exp3], timeout: 1.0)
-        XCTAssertEqual(floor(fpc.backdropView.alpha * 1000_000) / 1000_000, 0.3)
+        XCTAssertEqual(_floor(fpc.backdropView.alpha), 0.3)
+
+        // Test a size class change of FloatingPanelController.view
+
+        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.
+
+        // Test a view size change of FloatingPanelController.view
+
+        fpc.move(to: .full, animated: false)
+        delegate.layout = BackdropTestLayout()
+        fpc.invalidateLayout()
+        XCTAssertEqual(_floor(fpc.backdropView.alpha), 0.3)
+
+        delegate.layout = BackdropTestLayout2()
+        fpc.viewWillTransition(to: CGSize.zero, with: MockTransitionCoordinator())
+        XCTAssertEqual(fpc.backdropView.alpha, 0.0) // Must update the alpha by BackdropTestLayout2 in TestDelegate.
     }
 
-    func test_targetPosition_1positions() {
+    func test_initial_surface_position() {
+        class FloatingPanelTestDelegate: FloatingPanelControllerDelegate {
+            class Layout: FloatingPanelLayout {
+                let initialState: FloatingPanelState = .full
+                let position: FloatingPanelPosition = .top
+                let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring]
+                    = [.full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .bottom, referenceGuide: .superview)]
+            }
+            func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+                Layout()
+            }
+        }
+        do {
+            let delegate = FloatingPanelTestDelegate()
+            let fpc = FloatingPanelController(delegate: delegate)
+            XCTAssertEqual(fpc.surfaceView.position, .top)
+        }
+        do {
+            let fpc = FloatingPanelController()
+            fpc.layout = FloatingPanelTestDelegate.Layout()
+            XCTAssertEqual(fpc.surfaceView.position, .top)
+        }
+    }
+
+    func test_targetState_1positions() {
         class FloatingPanelLayout1Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .full
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [.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()
@@ -254,7 +309,7 @@ class CoreTests: XCTestCase {
         let fullPos = fpc.surfaceLocation(for: .full).y
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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
@@ -265,16 +320,14 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_2positions() {
+    func test_targetState_2positions() {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .half
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
-                    .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
-                ]
-            }
+            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
+                .half: FloatingPanelLayoutAnchor(absoluteInset: 250.0, edge: .bottom, referenceGuide: .superview),
+            ]
         }
 
         let delegate = FloatingPanelTestDelegate()
@@ -287,7 +340,7 @@ class CoreTests: XCTestCase {
         let halfPos = fpc.surfaceLocation(for: .half).y
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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),
@@ -304,7 +357,7 @@ class CoreTests: XCTestCase {
             (#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: [
+        assertTargetState(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),
@@ -322,16 +375,14 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_2positionsWithHidden() {
+    func test_targetState_2positionsWithHidden() {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
-                    .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
-                ]
-            }
+            let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 20.0, edge: .top, referenceGuide: .superview),
+                .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
+            ]
         }
 
         let delegate = FloatingPanelTestDelegate()
@@ -344,7 +395,7 @@ class CoreTests: XCTestCase {
         let hiddenPos = fpc.surfaceLocation(for: .hidden).y
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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),
@@ -361,7 +412,7 @@ class CoreTests: XCTestCase {
             (#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: [
+        assertTargetState(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),
@@ -379,7 +430,7 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_3positionsFromFull() {
+    func test_targetState_3positionsFromFull() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3Positions()
@@ -391,7 +442,7 @@ class CoreTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
         // From .full
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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
@@ -423,7 +474,7 @@ class CoreTests: XCTestCase {
         ])
     }
 
-    func test_targetPosition_3positionsFromFull_bottomEdge() {
+    func test_targetState_3positionsFromFull_bottomEdge() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3PositionsBottomEdge()
@@ -435,7 +486,7 @@ class CoreTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
         // From .full
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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
@@ -467,7 +518,7 @@ class CoreTests: XCTestCase {
         ])
     }
 
-    func test_targetPosition_3positionsFromHalf() {
+    func test_targetState_3positionsFromHalf() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3Positions()
@@ -479,7 +530,7 @@ class CoreTests: XCTestCase {
         let tipPos = fpc.surfaceLocation(for: .tip).y
         // From .half
         fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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
@@ -509,7 +560,7 @@ class CoreTests: XCTestCase {
         ])
     }
 
-    func test_targetPosition_3positionsFromHalf_bottomEdge() {
+    func test_targetState_3positionsFromHalf_bottomEdge() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3PositionsBottomEdge()
@@ -521,7 +572,7 @@ class CoreTests: XCTestCase {
             let tipPos = fpc.surfaceLocation(for: .tip).y
             // From .half
             fpc.move(to: .half, animated: false)
-            assertTargetPosition(fpc.floatingPanel, with: [
+            assertTargetState(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
@@ -551,7 +602,7 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_3positionsFromTip() {
+    func test_targetState_3positionsFromTip() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3Positions()
@@ -564,7 +615,7 @@ class CoreTests: XCTestCase {
 
         // From .tip
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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
@@ -594,7 +645,7 @@ class CoreTests: XCTestCase {
         ])
     }
 
-    func test_targetPosition_3positionsFromTip_bottomEdge() {
+    func test_targetState_3positionsFromTip_bottomEdge() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3PositionsBottomEdge()
@@ -607,7 +658,7 @@ class CoreTests: XCTestCase {
 
             // From .tip
             fpc.move(to: .tip, animated: false)
-            assertTargetPosition(fpc.floatingPanel, with: [
+            assertTargetState(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
@@ -637,7 +688,7 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_3positionsAllProjection() {
+    func test_targetState_3positionsAllProjection() {
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
         fpc.layout = FloatingPanelLayout3Positions()
@@ -651,7 +702,7 @@ class CoreTests: XCTestCase {
 
         // From .full
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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),
@@ -664,7 +715,7 @@ class CoreTests: XCTestCase {
 
         // From .half
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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),
@@ -673,7 +724,7 @@ class CoreTests: XCTestCase {
 
         // From .tip
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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),
@@ -685,17 +736,15 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_3positionsWithHidden() {
+    func test_targetState_3positionsWithHidden() {
         class FloatingPanelLayout3PositionsWithHidden: FloatingPanelLayout {
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [
-                    .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),
-                ]
-            }
+            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),
+            ]
         }
         let delegate = FloatingPanelTestDelegate()
         let fpc = FloatingPanelController(delegate: delegate)
@@ -705,11 +754,11 @@ class CoreTests: XCTestCase {
         XCTAssertEqual(fpc.state, .hidden)
 
         fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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: [
+        assertTargetState(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),
@@ -717,17 +766,15 @@ class CoreTests: XCTestCase {
             ])
     }
 
-    func test_targetPosition_3positionsWithHiddenWithoutFull() {
+    func test_targetState_3positionsWithHiddenWithoutFull() {
         class FloatingPanelLayout3Positions: FloatingPanelLayout {
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
-            var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-                return [
-                    .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),
-                ]
-            }
+            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),
+            ]
         }
 
         let delegate = FloatingPanelTestDelegate()
@@ -743,7 +790,7 @@ class CoreTests: XCTestCase {
         //let hiddenPos = fpc.surfaceLocation(for: .hidden)
 
         fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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
@@ -759,7 +806,7 @@ class CoreTests: XCTestCase {
             (#line, tipPos - 10.0, CGPoint(x: 0.0, y: 10.0), .tip), // redirection
             ])
         fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
+        assertTargetState(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),
@@ -773,6 +820,120 @@ class CoreTests: XCTestCase {
         fpc.showForTest()
         XCTAssertFalse(fpc.panGestureRecognizer.isEnabled)
     }
+
+    func test_is_scrollable() {
+        class Delegate: FloatingPanelControllerDelegate {
+            var shouldScroll = false
+            func floatingPanel(
+                _ fpc: FloatingPanelController,
+                shouldAllowToScroll scrollView: UIScrollView,
+                in state: FloatingPanelState
+            ) -> Bool {
+                return shouldScroll
+            }
+        }
+
+        let fpc = FloatingPanelController()
+        let scrollView = UIScrollView()
+        let delegate = Delegate()
+        fpc.layout = FloatingPanelBottomLayout()
+        fpc.track(scrollView: scrollView)
+        fpc.showForTest()
+
+        XCTAssertTrue(fpc.floatingPanel.isScrollable(state: .full))
+        XCTAssertFalse(fpc.floatingPanel.isScrollable(state: .half))
+
+        fpc.delegate = delegate
+
+        XCTAssertFalse(fpc.floatingPanel.isScrollable(state: .full))
+        XCTAssertFalse(fpc.floatingPanel.isScrollable(state: .half))
+
+        delegate.shouldScroll = true
+
+        XCTAssertTrue(fpc.floatingPanel.isScrollable(state: .full))
+        XCTAssertTrue(fpc.floatingPanel.isScrollable(state: .half))
+    }
+
+    func test_adjustScrollContentInsetIfNeeded() {
+        class CustomScrollView: UIScrollView {
+            var customSafeAreaInsets: UIEdgeInsets = .zero
+            override var safeAreaInsets: UIEdgeInsets {
+                customSafeAreaInsets
+            }
+        }
+
+        do {
+            let scrollView = CustomScrollView()
+            scrollView.customSafeAreaInsets = UIEdgeInsets(top: 0, left: 0, bottom: 34, right: 0)
+            let fpc = FloatingPanelController()
+            fpc.track(scrollView: scrollView)
+            fpc.layout = FloatingPanelBottomLayout()
+            fpc.contentInsetAdjustmentBehavior = .always
+            fpc.contentMode = .static
+            fpc.showForTest()
+
+            fpc.move(to: .half, animated: false)
+            fpc.floatingPanel.adjustScrollContentInsetIfNeeded()
+
+            let expect = 34 + (fpc.surfaceLocation(for: .half).y - fpc.surfaceLocation(for: .full).y)
+            XCTAssertEqual(
+                scrollView.contentInset,
+                UIEdgeInsets(top: 0, left: 0, bottom: expect, right: 0)
+            )
+
+            fpc.contentMode = .fitToBounds
+            XCTAssertEqual(
+                scrollView.contentInset,
+                scrollView.customSafeAreaInsets
+            )
+        }
+
+        do {
+            let scrollView = CustomScrollView()
+            scrollView.customSafeAreaInsets = UIEdgeInsets(top: 91, left: 0, bottom: 0, right: 0)
+            let fpc = FloatingPanelController()
+            fpc.track(scrollView: scrollView)
+            fpc.layout = FloatingPanelTopPositionedLayout()
+            fpc.contentInsetAdjustmentBehavior = .always
+            fpc.contentMode = .static
+            fpc.showForTest()
+
+            fpc.move(to: .half, animated: false)
+            fpc.floatingPanel.adjustScrollContentInsetIfNeeded()
+
+            let expect = 91 + (fpc.surfaceLocation(for: .full).y -  fpc.surfaceLocation(for: .half).y)
+            XCTAssertEqual(
+                scrollView.contentInset,
+                UIEdgeInsets(top: expect, left: 0, bottom: 0, right: 0)
+            )
+            fpc.contentMode = .fitToBounds
+            XCTAssertEqual(
+                scrollView.contentInset,
+                scrollView.customSafeAreaInsets
+            )
+        }
+    }
+
+    func test_handleGesture_endWithoutAttraction() throws {
+        class Delegate: FloatingPanelControllerDelegate {
+            var willAttract: Bool?
+            func floatingPanelDidEndDragging(_ fpc: FloatingPanelController, willAttract attract: Bool) {
+                willAttract = attract
+            }
+        }
+        let fpc = FloatingPanelController()
+        let scrollView = UIScrollView()
+        let delegate = Delegate()
+        fpc.showForTest()
+        fpc.delegate = delegate
+        XCTAssertEqual(fpc.state, .half)
+
+        fpc.floatingPanel.endWithoutAttraction(.full)
+
+        XCTAssertEqual(fpc.state, .full)
+        XCTAssertEqual(fpc.surfaceLocation(for: .full).y, fpc.surfaceLocation.y)
+        XCTAssertEqual(delegate.willAttract, false)
+    }
 }
 
 private class FloatingPanelLayout3Positions: FloatingPanelTestLayout {
@@ -788,9 +949,9 @@ private class FloatingPanelLayout3PositionsBottomEdge: FloatingPanelTop2BottomTe
 }
 
 private typealias TestParameter = (UInt, CGFloat,  CGPoint, FloatingPanelState)
-private func assertTargetPosition(_ floatingPanel: Core, with params: [TestParameter]) {
+private func assertTargetState(_ floatingPanel: Core, with params: [TestParameter]) {
     params.forEach { (line, pos, velocity, result) in
         floatingPanel.surfaceView.frame.origin.y = pos
-        XCTAssertEqual(floatingPanel.targetPosition(from: pos, with: velocity.y), result, line: line)
+        XCTAssertEqual(floatingPanel.targetState(from: pos, with: velocity.y), result, line: line)
     }
 }

Tests/ExtensionTests.swift

@@ -9,4 +9,20 @@ class ExtensionTests: XCTestCase {
         XCTAssertNotEqual(CGFloat(333.5).rounded(by: 3), 333.66666666666674)
         XCTAssertTrue(CGFloat(333.5).isEqual(to: 333.66666666666674, on: 3.0))
     }
+    
+    func test_roundedByDisplayScale_2() {
+        XCTAssertEqual(CGFloat(-0.16666666666674246).rounded(by: 3), 0.0)
+        XCTAssertEqual(CGFloat(0.16666666666674246).rounded(by: 3), 0.0)
+
+        XCTAssertEqual(CGFloat(-0.3333333333374246).rounded(by: 3), -0.3333333333333333)
+        XCTAssertEqual(CGFloat(-0.3333333333074246).rounded(by: 3), -0.3333333333333333)
+        XCTAssertEqual(CGFloat(0.33333333333374246).rounded(by: 3), 0.3333333333333333)
+        XCTAssertEqual(CGFloat(0.33333333333074246).rounded(by: 3), 0.3333333333333333)
+
+        XCTAssertEqual(CGFloat(-0.16666666666674246).rounded(by: 2), 0.0)
+        XCTAssertEqual(CGFloat(0.16666666666674246).rounded(by: 2), 0.0)
+
+        XCTAssertEqual(CGFloat(-0.16666666666674246).rounded(by: 6), -0.16666666666666666)
+        XCTAssertEqual(CGFloat(0.16666666666674246).rounded(by: 6), 0.16666666666666666)
+    }
 }

Tests/GestureTests.swift

@@ -0,0 +1,139 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import XCTest
+@testable import FloatingPanel
+
+final class GestureTests: XCTestCase {
+
+    func test_delegateProxy_shouldRecognizeSimultaneouslyWith() throws {
+        class GestureDelegateProxy: NSObject, UIGestureRecognizerDelegate {
+            var callsOfShouldRecognizeSimultaneouslyWith = 0
+            func gestureRecognizer(
+                _ gestureRecognizer: UIGestureRecognizer,
+                shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer
+            ) -> Bool {
+                callsOfShouldRecognizeSimultaneouslyWith += 1
+                return true
+            }
+        }
+        let fpc = FloatingPanelController()
+        fpc.showForTest()
+
+        let delegateProxy = GestureDelegateProxy()
+
+        // Set a proxy delegate
+        fpc.panGestureRecognizer.delegateProxy = delegateProxy
+
+        _ = fpc.panGestureRecognizer.delegate!.gestureRecognizer?(
+            UIGestureRecognizer(),
+            shouldRecognizeSimultaneouslyWith: UIGestureRecognizer()
+        )
+
+        XCTAssertEqual(delegateProxy.callsOfShouldRecognizeSimultaneouslyWith, 1)
+
+        // Check whether the default delegate method is called when the proxy delegate doesn't implement it.
+        XCTAssertTrue(
+            fpc.panGestureRecognizer.delegate!.gestureRecognizer!(
+                fpc.panGestureRecognizer,
+                shouldRequireFailureOf: FloatingPanelPanGestureRecognizer()
+            )
+        )
+
+        // Clear the proxy delegate
+        fpc.panGestureRecognizer.delegateProxy = nil
+
+        _ = fpc.panGestureRecognizer.delegate!.gestureRecognizer?(
+            UIGestureRecognizer(),
+            shouldRecognizeSimultaneouslyWith: UIGestureRecognizer()
+        )
+
+        XCTAssertEqual(delegateProxy.callsOfShouldRecognizeSimultaneouslyWith, 1)
+    }
+
+    func test_delegateProxy_shouldRequireFailureOf() throws {
+        class GestureDelegateProxy: NSObject, UIGestureRecognizerDelegate {
+            var callsOfShouldRequireFailureOf = 0
+            func gestureRecognizer(
+                _ gestureRecognizer: UIGestureRecognizer,
+                shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer
+            ) -> Bool {
+                callsOfShouldRequireFailureOf += 1
+                return true
+            }
+        }
+        let fpc = FloatingPanelController()
+        fpc.showForTest()
+
+        let delegateProxy = GestureDelegateProxy()
+
+        // Set a proxy delegate
+        fpc.panGestureRecognizer.delegateProxy = delegateProxy
+
+        _ = fpc.panGestureRecognizer.delegate!.gestureRecognizer?(
+            UIGestureRecognizer(),
+            shouldRequireFailureOf: UIGestureRecognizer()
+        )
+
+        XCTAssertEqual(delegateProxy.callsOfShouldRequireFailureOf, 1)
+
+        // Clear the proxy delegate
+        fpc.panGestureRecognizer.delegateProxy = nil
+
+        _ = fpc.panGestureRecognizer.delegate!.gestureRecognizer?(
+            UIGestureRecognizer(),
+            shouldRequireFailureOf: UIGestureRecognizer()
+        )
+
+        XCTAssertEqual(delegateProxy.callsOfShouldRequireFailureOf, 1)
+    }
+
+    func test_delegateProxy_shouldBeRequiredToFailBy() throws {
+        class GestureDelegateProxy: NSObject, UIGestureRecognizerDelegate {
+            var callsOfShouldBeRequiredToFailBy = 0
+            func gestureRecognizer(
+                _ gestureRecognizer: UIGestureRecognizer,
+                shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer
+            ) -> Bool {
+                callsOfShouldBeRequiredToFailBy += 1
+                return false
+            }
+        }
+        let fpc = FloatingPanelController()
+        fpc.showForTest()
+
+        let delegateProxy = GestureDelegateProxy()
+
+        fpc.panGestureRecognizer.delegateProxy = delegateProxy
+
+        _ = fpc.panGestureRecognizer.delegate!.gestureRecognizer?(
+            UIGestureRecognizer(),
+            shouldBeRequiredToFailBy: UIGestureRecognizer()
+        )
+
+        XCTAssertEqual(delegateProxy.callsOfShouldBeRequiredToFailBy, 1)
+
+        // Check whether the delegate method of the "proxy" object is called.
+        let otherPanGesture = UIPanGestureRecognizer()
+        otherPanGesture.name = "_UISheetInteractionBackgroundDismissRecognizer"
+        XCTAssertFalse(
+            fpc.panGestureRecognizer.delegate!.gestureRecognizer!(
+                fpc.panGestureRecognizer,
+                shouldBeRequiredToFailBy: otherPanGesture
+            )
+        )
+        XCTAssertEqual(delegateProxy.callsOfShouldBeRequiredToFailBy, 2)
+
+        fpc.panGestureRecognizer.delegateProxy = nil
+
+        // Check whether the delegate method of the "default" object is called.
+        let otherPanGesture2 = UIPanGestureRecognizer()
+        otherPanGesture2.name = "_UISheetInteractionBackgroundDismissRecognizer"
+        XCTAssertTrue(
+            fpc.panGestureRecognizer.delegate!.gestureRecognizer!(
+                fpc.panGestureRecognizer,
+                shouldBeRequiredToFailBy: otherPanGesture2
+            )
+        )
+        XCTAssertEqual(delegateProxy.callsOfShouldBeRequiredToFailBy, 2)
+    }
+}

Tests/LayoutTests.swift

@@ -17,23 +17,19 @@ class LayoutTests: XCTestCase {
         XCTAssertEqual(fpc.floatingPanel.layoutAdapter.leastExpandedState, .tip)
 
         class FloatingPanelLayoutWithHidden: FloatingPanelLayout {
-            var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
-                return [
-                    .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)
-                ]
-            }
+            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)
+            ]
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
         }
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
-            var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
-                return [
-                    .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
-                    .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
-                ]
-            }
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+                .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
+                .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea),
+            ]
             let initialState: FloatingPanelState = .tip
             let position: FloatingPanelPosition = .bottom
         }
@@ -224,12 +220,10 @@ class LayoutTests: XCTestCase {
 
     func test_updateInteractiveEdgeConstraintWithHidden() {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
-            var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
-                return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .bottom, referenceGuide: .safeArea),
-                    .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
-                ]
-            }
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .bottom, referenceGuide: .safeArea),
+                .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .bottom, referenceGuide: .superview),
+            ]
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .bottom
         }
@@ -267,12 +261,10 @@ class LayoutTests: XCTestCase {
 
     func test_updateInteractiveEdgeConstraintWithHidden_bottomEdge() {
         class FloatingPanelLayout2Positions: FloatingPanelLayout {
-            var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
-                [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .bottom, referenceGuide: .safeArea),
-                    .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .top, referenceGuide: .superview),
-                ]
-            }
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .bottom, referenceGuide: .safeArea),
+                .hidden: FloatingPanelLayoutAnchor(absoluteInset: 0, edge: .top, referenceGuide: .superview),
+            ]
             let initialState: FloatingPanelState = .hidden
             let position: FloatingPanelPosition = .top
         }
@@ -310,12 +302,10 @@ class LayoutTests: XCTestCase {
 
     func test_updateInteractiveTopConstraintWithMinusInsets() {
         class FloatingPanelLayoutMinusInsets: FloatingPanelLayout {
-            var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
-                [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: -200, edge: .top, referenceGuide: .safeArea),
-                    .tip: FloatingPanelLayoutAnchor(absoluteInset: -200, edge: .bottom, referenceGuide: .safeArea),
-                ]
-            }
+            let anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] = [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: -200, edge: .top, referenceGuide: .safeArea),
+                .tip: FloatingPanelLayoutAnchor(absoluteInset: -200, edge: .bottom, referenceGuide: .safeArea),
+            ]
             let initialState: FloatingPanelState = .full
             let position: FloatingPanelPosition = .bottom
         }
@@ -421,18 +411,18 @@ 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)),
+             result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.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)),
+             result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.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)),
+             result: (#line, constant: 0.0, firstAnchor: fpc.view.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)),
+             result: (#line, constant: 100.0, firstAnchor: fpc.view.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),
@@ -450,7 +440,7 @@ class LayoutTests: XCTestCase {
             (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)),
+             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.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),
@@ -460,7 +450,7 @@ class LayoutTests: XCTestCase {
             (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)),
+             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.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),
@@ -469,12 +459,7 @@ class LayoutTests: XCTestCase {
                 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)
+                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
     }
     func test_layoutAnchor_bottomPosition() {
@@ -487,9 +472,9 @@ 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)),
+             result: (#line, constant: 0.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.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)),
+             result: (#line, constant: 100.0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.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),
@@ -497,9 +482,9 @@ class LayoutTests: XCTestCase {
 
             // 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)),
+             result: (#line, constant: 0.0, firstAnchor: fpc.view.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)),
+             result: (#line, constant: 100.0, firstAnchor: fpc.view.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),
@@ -517,7 +502,7 @@ class LayoutTests: XCTestCase {
             (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)),
+             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.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),
@@ -527,7 +512,7 @@ class LayoutTests: XCTestCase {
             (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)),
+             result: (#line, multiplier: 0.5, secondAnchor: fpc.view.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),
@@ -536,12 +521,7 @@ class LayoutTests: XCTestCase {
                 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)
+                XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
     }
 
@@ -567,20 +547,20 @@ class LayoutTests: XCTestCase {
 
         for prop in [
             (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
-             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
+             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.safeAreaLayoutGuide.topAnchor)),
             (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .safeArea),
-             result: (#line, constant: 420 - 42, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
+             result: (#line, constant: 420 - 42, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.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)),
+             result: (#line, constant: 420, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.safeAreaLayoutGuide.topAnchor)),
             (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
-             result: (#line, constant: 210, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
+             result: (#line, constant: 210, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.safeAreaLayoutGuide.topAnchor)),
             (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .safeArea),
-             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.topAnchor)),
+             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.bottomAnchor, secondAnchor: fpc.view.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),
@@ -617,20 +597,20 @@ class LayoutTests: XCTestCase {
 
         for prop in [
             (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
-             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
+             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.safeAreaLayoutGuide.bottomAnchor)),
             (anchor: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 42.0, referenceGuide: .safeArea),
-             result: (#line, constant: -420 + 42, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
+             result: (#line, constant: -420 + 42, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.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)),
+             result: (#line, constant: -420, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.safeAreaLayoutGuide.bottomAnchor)),
             (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.5, referenceGuide: .safeArea),
-             result: (#line, constant: -210, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
+             result: (#line, constant: -210, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.safeAreaLayoutGuide.bottomAnchor)),
             (anchor: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 1.0, referenceGuide: .safeArea),
-             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.fp_safeAreaLayoutGuide.bottomAnchor)),
+             result: (#line, constant: 0, firstAnchor: fpc.surfaceView.topAnchor, secondAnchor: fpc.view.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),
@@ -644,6 +624,41 @@ class LayoutTests: XCTestCase {
                 XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
         }
     }
+
+    func test_offsetFromMostExpandedAnchor() {
+        do {
+            let fpc = FloatingPanelController()
+            fpc.layout = FloatingPanelBottomLayout()
+            fpc.showForTest()
+
+            fpc.move(to: .full, animated: false)
+
+            XCTAssertEqual(fpc.floatingPanel.layoutAdapter.offsetFromMostExpandedAnchor, 0.0)
+
+            fpc.move(to: .half, animated: false)
+
+            XCTAssertEqual(
+                fpc.floatingPanel.layoutAdapter.offsetFromMostExpandedAnchor,
+                (fpc.surfaceLocation(for: .half) - fpc.surfaceLocation(for: .full)).y
+            )
+        }
+        do {
+            let fpc = FloatingPanelController()
+            fpc.layout = FloatingPanelTopPositionedLayout()
+            fpc.showForTest()
+
+            fpc.move(to: .full, animated: false)
+
+            XCTAssertEqual(fpc.floatingPanel.layoutAdapter.offsetFromMostExpandedAnchor, 0.0)
+
+            fpc.move(to: .half, animated: false)
+
+            XCTAssertEqual(
+                fpc.floatingPanel.layoutAdapter.offsetFromMostExpandedAnchor,
+                -(fpc.surfaceLocation(for: .half) - fpc.surfaceLocation(for: .full)).y
+            )
+        }
+    }
 }
 
 private typealias LayoutSegmentTestParameter = (UInt, pos: CGFloat, forwardY: Bool, lower: FloatingPanelState?, upper: FloatingPanelState?)

Tests/TestSupports.swift

@@ -72,8 +72,40 @@ class FloatingPanelTop2BottomTestLayout: FloatingPanelLayout {
     }
 }
 
+class FloatingPanelTopPositionedLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .top
+    let initialState: FloatingPanelState = .full
+    let anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] = [
+        .full: FloatingPanelLayoutAnchor(absoluteInset: 88.0, edge: .bottom, referenceGuide: .safeArea),
+        .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .top, referenceGuide: .safeArea),
+        .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .top, referenceGuide: .safeArea)
+    ]
+}
+
 class FloatingPanelProjectableBehavior: FloatingPanelBehavior {
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedTargetPosition: FloatingPanelState) -> Bool {
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedState: FloatingPanelState) -> Bool {
         return true
     }
 }
+
+class MockTransitionCoordinator: NSObject, UIViewControllerTransitionCoordinator {
+    func animate(alongsideTransition animation: ((UIViewControllerTransitionCoordinatorContext) -> Void)?, completion: ((UIViewControllerTransitionCoordinatorContext) -> Void)? = nil) -> Bool { true }
+    func animateAlongsideTransition(in view: UIView?, animation: ((UIViewControllerTransitionCoordinatorContext) -> Void)?, completion: ((UIViewControllerTransitionCoordinatorContext) -> Void)? = nil) -> Bool { true }
+    func notifyWhenInteractionEnds(_ handler: @escaping (UIViewControllerTransitionCoordinatorContext) -> Void) {}
+    func notifyWhenInteractionChanges(_ handler: @escaping (UIViewControllerTransitionCoordinatorContext) -> Void) {}
+    var isAnimated: Bool = false
+    var presentationStyle: UIModalPresentationStyle = .fullScreen
+    var initiallyInteractive: Bool = false
+    var isInterruptible: Bool = false
+    var isInteractive: Bool = false
+    var isCancelled: Bool = false
+    var transitionDuration: TimeInterval = 0.25
+    var percentComplete: CGFloat = 0
+    var completionVelocity: CGFloat = 0
+    var completionCurve: UIView.AnimationCurve = .easeInOut
+    func viewController(forKey key: UITransitionContextViewControllerKey) -> UIViewController? { nil }
+    func view(forKey key: UITransitionContextViewKey) -> UIView? { nil }
+    var containerView: UIView { UIView() }
+    var targetTransform: CGAffineTransform = .identity
+}
+

Tests/TestingApp/AppDelegate.swift

@@ -1,19 +0,0 @@
-// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
-
-import UIKit
-@UIApplicationMain
-class AppDelegate: UIResponder, UIApplicationDelegate {
-    var window: UIWindow?
-
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
-        let rootVC = UIViewController(nibName: nil, bundle: nil)
-        rootVC.view.backgroundColor = .gray
-
-        let window = UIWindow()
-        window.rootViewController = rootVC
-        window.makeKeyAndVisible()
-        self.window = window
-
-        return true
-    }
-}

Tests/TestingApp/Info.plist

@@ -1,43 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>$(DEVELOPMENT_LANGUAGE)</string>
-	<key>CFBundleExecutable</key>
-	<string>$(EXECUTABLE_NAME)</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>$(PRODUCT_NAME)</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleVersion</key>
-	<string>1</string>
-	<key>LSRequiresIPhoneOS</key>
-	<true/>
-	<key>UILaunchStoryboardName</key>
-	<string>LaunchScreen</string>
-	<key>UIRequiredDeviceCapabilities</key>
-	<array>
-		<string>armv7</string>
-	</array>
-	<key>UISupportedInterfaceOrientations</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-	<key>UISupportedInterfaceOrientations~ipad</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationPortraitUpsideDown</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-</dict>
-</plist>

Tests/TestingApp/LaunchScreen.storyboard

@@ -1,48 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13142" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
-    <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12042"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
-        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
-        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
-    </dependencies>
-    <scenes>
-        <!--View Controller-->
-        <scene sceneID="EHf-IW-A2E">
-            <objects>
-                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
-                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <subviews>
-                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Copyright © 2019 scenee. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="obG-Y5-kRd">
-                                <rect key="frame" x="0.0" y="626.5" width="375" height="20.5"/>
-                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
-                                <nil key="highlightedColor"/>
-                            </label>
-                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="TestingApp" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="GJd-Yh-RWb">
-                                <rect key="frame" x="0.0" y="202" width="375" height="43"/>
-                                <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
-                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
-                                <nil key="highlightedColor"/>
-                            </label>
-                        </subviews>
-                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
-                        <constraints>
-                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="centerX" secondItem="obG-Y5-kRd" secondAttribute="centerX" id="5cz-MP-9tL"/>
-                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="centerX" secondItem="GJd-Yh-RWb" secondAttribute="centerX" id="Q3B-4B-g5h"/>
-                            <constraint firstItem="obG-Y5-kRd" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" constant="20" symbolic="YES" id="SfN-ll-jLj"/>
-                            <constraint firstAttribute="bottom" secondItem="obG-Y5-kRd" secondAttribute="bottom" constant="20" id="Y44-ml-fuU"/>
-                            <constraint firstItem="GJd-Yh-RWb" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="bottom" multiplier="1/3" constant="1" id="moa-c2-u7t"/>
-                            <constraint firstItem="GJd-Yh-RWb" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" constant="20" symbolic="YES" id="x7j-FC-K8j"/>
-                        </constraints>
-                        <viewLayoutGuide key="safeArea" id="Bcu-3y-fUS"/>
-                    </view>
-                </viewController>
-                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
-            </objects>
-            <point key="canvasLocation" x="53" y="375"/>
-        </scene>
-    </scenes>
-</document>