Version 2.6.4

The Logging API document says that `os_log` is one of the legacy logging
symbols. However,  this library needs to be supported below iOS 14 so
`log(level:_:)` cannot be used.

.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

@@ -17,8 +17,14 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - swift: "5.8"
+            xcode: "14.3"
+            runsOn: macos-13
+          - swift: "5.7"
+            xcode: "14.1"
+            runsOn: macos-12
           - swift: "5.6"
-            xcode: "13.3.1"
+            xcode: "13.4.1"
             runsOn: macos-12
           - swift: "5.5"
             xcode: "13.2.1"
@@ -28,15 +34,12 @@ jobs:
             runsOn: macos-11
           - swift: "5.3"
             xcode: "12.4"
-            runsOn: macos-10.15
+            runsOn: macos-11
           - swift: "5.2"
             xcode: "11.7"
-            runsOn: macos-10.15
-          - swift: "5.1"
-            xcode: "11.3.1"
-            runsOn: macos-10.15
+            runsOn: 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
 
@@ -48,73 +51,67 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: "15.4"
-            xcode: "13.3.1"
+          - os: "16.4"
+            xcode: "14.3.1"
+            sim: "iPhone 14 Pro"
+            runsOn: 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: "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
     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 }}'
+    timeout-minutes: 20
 
   example:
     runs-on: macos-12
     env:
-      DEVELOPER_DIR: /Applications/Xcode_13.3.1.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_14.1.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
 
   swiftpm:
     runs-on: macos-12
     env:
-      DEVELOPER_DIR: /Applications/Xcode_13.3.1.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_14.1.app/Contents/Developer
     strategy:
       fail-fast: false
       matrix:
         include:
-          - target: "arm64-apple-ios15.4-simulator"
-          - target: "x86_64-apple-ios15.4-simulator"
+          # 15.7
+          - target: "x86_64-apple-ios15.7-simulator"
+          - target: "arm64-apple-ios15.7-simulator"
+          # 16.1
+          - target: "x86_64-apple-ios16.1-simulator"
+          - target: "arm64-apple-ios16.1-simulator"
     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 }}"
 
   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
     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

Examples/Samples/Samples.xcodeproj/project.pbxproj

@@ -18,13 +18,12 @@
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 		54496C59263A7E5A0031E0C8 /* UseCaseController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54496C58263A7E5A0031E0C8 /* UseCaseController.swift */; };
+		544BC56826CC918200D0A436 /* AdaptiveLayoutTestViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 544BC56726CC918200D0A436 /* AdaptiveLayoutTestViewController.swift */; };
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-		545DBA0321511E6400CA77B8 /* SampleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0221511E6400CA77B8 /* SampleTests.swift */; };
-		545DBA0E21511E6400CA77B8 /* SampleUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0D21511E6400CA77B8 /* SampleUITests.swift */; };
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@@ -36,23 +35,6 @@
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-			proxyType = 1;
-			remoteGlobalIDString = 545DB9E921511E6300CA77B8;
-			remoteInfo = FloatingModalSample;
-		};
-		545DBA0A21511E6400CA77B8 /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 545DB9E221511E6300CA77B8 /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 545DB9E921511E6300CA77B8;
-			remoteInfo = FloatingModalSample;
-		};
-/* End PBXContainerItemProxy section */
-
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@@ -79,6 +61,7 @@
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 		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 /* AdaptiveLayoutTestViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveLayoutTestViewController.swift; sourceTree = "<group>"; };
 		545DB9EA21511E6300CA77B8 /* Samples.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Samples.app; sourceTree = BUILT_PRODUCTS_DIR; };
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 		545DB9EF21511E6300CA77B8 /* MainViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MainViewController.swift; sourceTree = "<group>"; };
@@ -86,12 +69,6 @@
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 		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; };
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-		545DBA0421511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
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-		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>"; };
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@@ -112,20 +89,6 @@
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-			files = (
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-			buildActionMask = 2147483647;
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 /* Begin PBXGroup section */
@@ -142,6 +105,7 @@
 				5442E22725FC51E200A26F43 /* MultiPanelController.swift */,
 				5442E22B25FC521F00A26F43 /* SettingsViewController.swift */,
 				5442E22F25FC525200A26F43 /* TabBarViewController.swift */,
+				544BC56726CC918200D0A436 /* AdaptiveLayoutTestViewController.swift */,
 			);
 			path = ContentViewControllers;
 			sourceTree = "<group>";
@@ -151,8 +115,6 @@
 			children = (
 				549D23CA233C7779008EF4D7 /* FloatingPanel.framework */,
 				545DB9EC21511E6300CA77B8 /* Sources */,
-				545DBA0121511E6400CA77B8 /* Tests */,
-				545DBA0C21511E6400CA77B8 /* UITests */,
 				545DB9EB21511E6300CA77B8 /* Products */,
 				5D82A6AB28D18438006A44BA /* Frameworks */,
 			);
@@ -162,8 +124,6 @@
 			isa = PBXGroup;
 			children = (
 				545DB9EA21511E6300CA77B8 /* Samples.app */,
-				545DB9FE21511E6400CA77B8 /* SamplesTests.xctest */,
-				545DBA0921511E6400CA77B8 /* SamplesUITests.xctest */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -187,24 +147,6 @@
 			path = Sources;
 			sourceTree = "<group>";
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-		545DBA0121511E6400CA77B8 /* Tests */ = {
-			isa = PBXGroup;
-			children = (
-				545DBA0221511E6400CA77B8 /* SampleTests.swift */,
-				545DBA0421511E6400CA77B8 /* Info.plist */,
-			);
-			path = Tests;
-			sourceTree = "<group>";
-		};
-		545DBA0C21511E6400CA77B8 /* UITests */ = {
-			isa = PBXGroup;
-			children = (
-				545DBA0D21511E6400CA77B8 /* SampleUITests.swift */,
-				545DBA0F21511E6400CA77B8 /* Info.plist */,
-			);
-			path = UITests;
-			sourceTree = "<group>";
-		};
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 			children = (
@@ -244,42 +186,6 @@
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-			productName = FloatingModalSampleTests;
-			productReference = 545DB9FE21511E6400CA77B8 /* SamplesTests.xctest */;
-			productType = "com.apple.product-type.bundle.unit-test";
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-			dependencies = (
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@@ -293,14 +199,6 @@
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@@ -317,8 +215,6 @@
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@@ -334,20 +230,6 @@
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@@ -359,6 +241,7 @@
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 				54CDC5D8215BBE23007D205C /* SupplementaryViews.swift in Sources */,
 				54B51116216AFE5F0033A6F3 /* Extensions.swift in Sources */,
+				544BC56826CC918200D0A436 /* AdaptiveLayoutTestViewController.swift in Sources */,
 				5442E24A25FC53C100A26F43 /* DebugTextViewController.swift in Sources */,
 				546341AC25C6426500CA0596 /* CustomState.swift in Sources */,
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@@ -377,37 +260,8 @@
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@@ -553,7 +407,7 @@
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 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Sources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -576,7 +430,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Sources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -592,90 +446,6 @@
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-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-					"@loader_path/Frameworks",
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-				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
-				TARGETED_DEVICE_FAMILY = "1,2";
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-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-					"@loader_path/Frameworks",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalSampleTests;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
-				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Samples.app/Samples";
-			};
-			name = Release;
-		};
-		545DBA1921511E6400CA77B8 /* Debug */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
-				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = J3D7L9FHSS;
-				INFOPLIST_FILE = UITests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-					"@loader_path/Frameworks",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalSampleUITests;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
-				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_TARGET_NAME = FloatingModalSample;
-			};
-			name = Debug;
-		};
-		545DBA1A21511E6400CA77B8 /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
-				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = J3D7L9FHSS;
-				INFOPLIST_FILE = UITests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-					"@loader_path/Frameworks",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalSampleUITests;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
-				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_TARGET_NAME = FloatingModalSample;
-			};
-			name = Release;
-		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -697,24 +467,6 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		545DBA1521511E6400CA77B8 /* Build configuration list for PBXNativeTarget "SamplesTests" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				545DBA1621511E6400CA77B8 /* Debug */,
-				545DBA1721511E6400CA77B8 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		545DBA1821511E6400CA77B8 /* Build configuration list for PBXNativeTarget "SamplesUITests" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				545DBA1921511E6400CA77B8 /* Debug */,
-				545DBA1A21511E6400CA77B8 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 545DB9E221511E6300CA77B8 /* Project object */;

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

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="21225" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="21507" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
     <device id="retina6_1" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="21207"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="21505"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="Stack View standard spacing" minToolsVersion="9.0"/>
         <capability name="System colors in document resources" minToolsVersion="11.0"/>
@@ -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>
@@ -598,7 +598,7 @@
                                 </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="48" width="375" height="730"/>
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                                 <color key="backgroundColor" red="0.0078431372550000003" green="0.72156862749999995" blue="0.45882352939999999" alpha="1" colorSpace="calibratedRGB"/>
                             </view>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="noi-1a-5bZ" customClass="CloseButton" customModule="Samples" customModuleProvider="target">
@@ -660,9 +660,9 @@
                         <color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <gestureRecognizers/>
                         <constraints>
+                            <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" 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"/>
@@ -782,6 +782,51 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
             </objects>
             <point key="canvasLocation" x="-1" y="734"/>
         </scene>
+        <!--Adaptive Layout Test View Controller-->
+        <scene sceneID="rDI-lU-wEx">
+            <objects>
+                <viewController storyboardIdentifier="AdaptiveLayoutTestViewController" id="5nC-6E-bXf" customClass="AdaptiveLayoutTestViewController" 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">

Examples/Samples/Sources/ContentViewControllers/AdaptiveLayoutTestViewController.swift

@@ -0,0 +1,89 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class AdaptiveLayoutTestViewController: 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/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/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
+                )
+            ]
         }
     }
 

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() {
@@ -16,12 +16,12 @@ final class SettingsViewController: InspectableViewController {
         super.viewDidLayoutSubviews()
         if #available(iOS 11.0, *) {
             let prefersLargeTitles = navigationController!.navigationBar.prefersLargeTitles
-            largeTitlesSwicth.setOn(prefersLargeTitles, animated: false)
+            largeTitlesSwitch.setOn(prefersLargeTitles, animated: false)
         } else {
-            largeTitlesSwicth.isEnabled = false
+            largeTitlesSwitch.isEnabled = false
         }
         let isTranslucent = navigationController!.navigationBar.isTranslucent
-        translucentSwicth.setOn(isTranslucent, animated: false)
+        translucentSwitch.setOn(isTranslucent, animated: false)
     }
 
     @IBAction func toggleLargeTitle(_ sender: UISwitch) {
@@ -30,7 +30,19 @@ final class SettingsViewController: InspectableViewController {
         }
     }
     @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/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 }

Examples/Samples/Sources/UseCases/UseCase.swift

@@ -10,6 +10,7 @@ enum UseCase: Int, CaseIterable {
     case showPanelModal
     case showMultiPanelModal
     case showPanelInSheetModal
+    case showOnWindow
     case showTabBar
     case showPageView
     case showPageContentView
@@ -34,6 +35,7 @@ extension UseCase {
         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"
@@ -50,7 +52,9 @@ extension UseCase {
         case .showCustomStatePanel: return "Show Panel with Custom state"
         }
     }
+}
 
+extension UseCase {
     private enum Content {
         case storyboard(String)
         case viewController(UIViewController)
@@ -63,6 +67,7 @@ extension UseCase {
         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))
@@ -76,7 +81,7 @@ 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 .showAdaptivePanelWithCustomGuide: return .storyboard(String(describing: AdaptiveLayoutTestViewController.self))
         case .showCustomStatePanel: return .viewController(DebugTableViewController())
         }
     }
@@ -86,6 +91,7 @@ extension UseCase {
         case .storyboard(let id):
             return storyboard.instantiateViewController(withIdentifier: id)
         case .viewController(let vc):
+            vc.loadViewIfNeeded()
             return 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
@@ -157,6 +158,19 @@ extension UseCaseController {
             let fpc = MultiPanelController()
             mainVC.present(fpc, animated: true, completion: nil)
 
+        case .showOnWindow:
+            let fpc = overWindowPanelVC
+            fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = 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()
@@ -218,22 +232,34 @@ extension UseCaseController {
             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 == .showAdaptivePanelWithCustomGuide) ? .withHeaderFooter : .onlyImage
+                let layoutGuide = contentVC.layoutGuideFor(mode: mode)
+                fpc.layout = ImageViewController.PanelLayout(targetGuide: layoutGuide)
             }
             addMain(panel: fpc)
 
+        case .showAdaptivePanelWithCustomGuide:
+            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.ext_trackScrollView(in: contentVC)
+            fpc.layout = AdaptiveLayoutTestViewController.PanelLayout(targetGuide: contentVC.view.makeBoundsLayoutGuide())
+            addMain(panel: fpc)
+
         case .showCustomStatePanel:
             let fpc = FloatingPanelController()
             fpc.delegate = self
@@ -283,7 +309,7 @@ extension UseCaseController {
         }
     }
 
-   @objc
+    @objc
     private func handleSurface(tapGesture: UITapGestureRecognizer) {
         switch mainPanelVC.state {
         case .full:
@@ -377,6 +403,9 @@ private extension FloatingPanelController {
         case let contentVC as ImageViewController:
             track(scrollView: contentVC.scrollView)
 
+        case let contentVC as AdaptiveLayoutTestViewController:
+            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.
-    }
-
-}

FloatingPanel.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name                = "FloatingPanel"
-  s.version             = "2.5.5"
+  s.version             = "2.6.4"
   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.
@@ -14,7 +14,7 @@ The new interface displays the related contents and utilities in parallel as a u
   s.platform            = :ios, "10.0"
   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

@@ -17,17 +17,15 @@
 		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 */; };
 		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 */; };
@@ -45,13 +43,6 @@
 			remoteGlobalIDString = 545DB9C02151169500CA77B8;
 			remoteInfo = FloatingModalController;
 		};
-		54E740DC218AFE9F005C1A34 /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 545DB9B82151169500CA77B8 /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 54E740C9218AFD67005C1A34;
-			remoteInfo = TestingHost;
-		};
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
@@ -68,25 +59,21 @@
 		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>"; };
 		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 */
 
@@ -107,13 +94,6 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		54E740C7218AFD67005C1A34 /* Frameworks */ = {
-			isa = PBXFrameworksBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -132,7 +112,6 @@
 			children = (
 				545DB9C12151169500CA77B8 /* FloatingPanel.framework */,
 				545DB9CA2151169500CA77B8 /* FloatingPanelTests.xctest */,
-				54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -145,7 +124,7 @@
 				5469F4B124B30F1100537F8A /* Position.swift */,
 				54CFBFC4215CD09C006B5735 /* Core.swift */,
 				54CFBFC2215CD045006B5735 /* Layout.swift */,
-				5469F4B324B30F3500537F8A /* LayoutReferences.swift */,
+				5469F4B324B30F3500537F8A /* LayoutProperties.swift */,
 				5469F4AF24B30E1500537F8A /* LayoutAnchoring.swift */,
 				5450EEE321646DF500135936 /* Behavior.swift */,
 				54352E9721A521CA00CBCA08 /* PassthroughView.swift */,
@@ -154,7 +133,7 @@
 				545DBA2A2152383100CA77B8 /* GrabberView.swift */,
 				54352E9521A51A2500CBCA08 /* Transitioning.swift */,
 				54DBA3DB262E938500D75969 /* Extensions.swift */,
-				54ABD7AE216CCFF7002E6C13 /* Logger.swift */,
+				54ABD7AE216CCFF7002E6C13 /* Logging.swift */,
 				545DB9C42151169500CA77B8 /* FloatingPanel.h */,
 				545DB9C52151169500CA77B8 /* Info.plist */,
 				54E3992627141F5100A8F9ED /* FloatingPanel.docc */,
@@ -165,7 +144,6 @@
 		545DB9CE2151169500CA77B8 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
-				5469F49E24B003EF00537F8A /* TestingApp */,
 				54A6B6B022968B530077F348 /* CoreTests.swift */,
 				545DB9CF2151169500CA77B8 /* ControllerTests.swift */,
 				542753C522C49A6E00D17955 /* LayoutTests.swift */,
@@ -178,16 +156,6 @@
 			path = Tests;
 			sourceTree = "<group>";
 		};
-		5469F49E24B003EF00537F8A /* TestingApp */ = {
-			isa = PBXGroup;
-			children = (
-				5469F49F24B003EF00537F8A /* LaunchScreen.storyboard */,
-				5469F4A024B003EF00537F8A /* AppDelegate.swift */,
-				5469F4A124B003EF00537F8A /* Info.plist */,
-			);
-			path = TestingApp;
-			sourceTree = "<group>";
-		};
 		5D82A6B328D18460006A44BA /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
@@ -240,30 +208,12 @@
 			);
 			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 */
@@ -280,10 +230,6 @@
 					};
 					545DB9C92151169500CA77B8 = {
 						CreatedOnToolsVersion = 10.0;
-						TestTargetID = 54E740C9218AFD67005C1A34;
-					};
-					54E740C9218AFD67005C1A34 = {
-						CreatedOnToolsVersion = 10.1;
 					};
 				};
 			};
@@ -302,7 +248,6 @@
 			targets = (
 				545DB9C02151169500CA77B8 /* FloatingPanel */,
 				545DB9C92151169500CA77B8 /* FloatingPanelTests */,
-				54E740C9218AFD67005C1A34 /* TestingApp */,
 			);
 		};
 /* End PBXProject section */
@@ -322,14 +267,6 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		54E740C8218AFD67005C1A34 /* Resources */ = {
-			isa = PBXResourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-				5469F4A224B003EF00537F8A /* LaunchScreen.storyboard in Resources */,
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
@@ -341,11 +278,11 @@
 				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 */,
@@ -370,14 +307,6 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		54E740C6218AFD67005C1A34 /* Sources */ = {
-			isa = PBXSourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-				5469F4A324B003EF00537F8A /* AppDelegate.swift in Sources */,
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
 /* End PBXSourcesBuildPhase section */
 
 /* Begin PBXTargetDependency section */
@@ -386,11 +315,6 @@
 			target = 545DB9C02151169500CA77B8 /* FloatingPanel */;
 			targetProxy = 545DB9CC2151169500CA77B8 /* PBXContainerItemProxy */;
 		};
-		54E740DD218AFE9F005C1A34 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			target = 54E740C9218AFD67005C1A34 /* TestingApp */;
-			targetProxy = 54E740DC218AFE9F005C1A34 /* PBXContainerItemProxy */;
-		};
 /* End PBXTargetDependency section */
 
 /* Begin XCBuildConfiguration section */
@@ -593,11 +517,10 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				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;
 		};
@@ -614,47 +537,10 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				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;
 		};
@@ -767,25 +653,10 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				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;
 		};
@@ -822,16 +693,6 @@
 			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 */;

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](https://floatingpanel.github.io/2.6.4/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)
@@ -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 +91,11 @@ Examples are here.
 
 ## Requirements
 
-FloatingPanel is written in Swift 5.0+. Compatible with iOS 11.0+.
+FloatingPanel is written in Swift 5.0+ and compatible with iOS 11.0+. 
 
-The deployment is still iOS 10, but it is recommended to use this library on iOS 11+.
+While it still supports iOS 10, it is recommended to use this library on iOS 11+.
 
-:pencil2: You would like to use Swift 4.0. Please use FloatingPanel v1. 
+:pencil2: If you'd like to use Swift 4.0, please use FloatingPanel v1.
 
 ## Installation
 

Sources/BackdropView.swift

@@ -7,5 +7,19 @@ import UIKit
 public 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
+
+    init() {
+        dismissalTapGestureRecognizer = UITapGestureRecognizer()
+        dismissalTapGestureRecognizer.isEnabled = false
+        super.init(frame: .zero)
+        addGestureRecognizer(dismissalTapGestureRecognizer)
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
 }

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
@@ -167,7 +168,8 @@ 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 +181,8 @@ 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)
             }
         }
     }
@@ -375,7 +378,7 @@ 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
@@ -414,8 +417,14 @@ open class FloatingPanelController: UIViewController {
                 guard let self = self else { return }
                 self.delegate?.floatingPanelDidRemove?(self)
             }
-        } else {
+        } else if parent != nil {
             removePanelFromParent(animated: true)
+        } else {
+            hide(animated: true) { [weak self] in
+                guard let self = self else { return }
+                self.view.removeFromSuperview()
+                self.delegate?.floatingPanelDidRemove?(self)
+            }
         }
     }
 
@@ -441,6 +450,12 @@ open class FloatingPanelController: UIViewController {
                 // 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)
             }
         } else {
@@ -470,7 +485,7 @@ 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.")
@@ -588,6 +603,16 @@ open class FloatingPanelController: UIViewController {
             break
         }
     }
+    
+    /// [Experimental] Allows the panel to move as its tracking scroll view bounces.
+    ///
+    /// This method must be called in the delegate method, `UIScrollViewDelegate.scrollViewDidScroll(_:)`,
+    /// 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.
     ///
@@ -676,30 +701,30 @@ 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 = {
         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)
             }
@@ -709,7 +734,7 @@ 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)
             }
@@ -717,6 +742,6 @@ public extension UIViewController {
         }
 
         // For other view controllers
-        self.fp_original_dismiss(animated: flag, completion: completion)
+        dismissImp(self, sel, flag, completion)
     }
 }

Sources/Core.swift

@@ -1,6 +1,7 @@
 // Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
 
 import UIKit
+import os.log
 
 ///
 /// The presentation model of FloatingPanel
@@ -35,7 +36,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
     private(set) var state: FloatingPanelState = .hidden {
         didSet {
-            log.debug("state changed: \(oldValue) -> \(state)")
+            os_log(msg, log: devLog, type: .debug, "state changed: \(oldValue) -> \(state)")
             if let vc = ownerVC {
                 vc.delegate?.floatingPanelDidChangeState?(vc)
             }
@@ -66,6 +67,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     private var stopScrollDeceleration: Bool = false
     private var scrollBounce = false
     private var scrollIndictorVisible = false
+    private var scrollBounceThreshold: CGFloat = -30.0
 
     // MARK: - Interface
 
@@ -96,11 +98,9 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         panGestureRecognizer.addTarget(self, action: #selector(handle(panGesture:)))
         panGestureRecognizer.delegate = self
 
-        // Set tap-to-dismiss in the backdrop view
-        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleBackdrop(tapGesture:)))
-        tapGesture.isEnabled = false
-        backdropView.dismissalTapGestureRecognizer = tapGesture
-        backdropView.addGestureRecognizer(tapGesture)
+        // Set the tap-to-dismiss action of the backdrop view.
+        // It's disabled by default. See also BackdropView.dismissalTapGestureRecognizer.
+        backdropView.dismissalTapGestureRecognizer.addTarget(self, action: #selector(handleBackdrop(tapGesture:)))
     }
 
     deinit {
@@ -164,7 +164,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                 self.updateLayout(to: to)
 
                 if shouldDoubleLayout {
-                    log.info("Lay out the surface again to modify an intrinsic size error according to UIStackView")
+                    os_log(msg, log: sysLog, type: .info, "Lay out the surface again to modify an intrinsic size error according to UIStackView")
                     self.updateLayout(to: to)
                 }
             }
@@ -233,7 +233,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     func getBackdropAlpha(at cur: CGFloat, with translation: CGFloat) -> CGFloat {
-        /* log.debug("currentY: \(currentY) translation: \(translation)") */
+        /* os_log(msg, log: devLog, type: .debug, "currentY: \(currentY) translation: \(translation)") */
         let forwardY = (translation >= 0)
 
         let segment = layoutAdapter.segment(at: cur, forward: forwardY)
@@ -266,7 +266,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
         guard gestureRecognizer == panGestureRecognizer else { return false }
 
-        /* log.debug("shouldRecognizeSimultaneouslyWith", otherGestureRecognizer) */
+        /* os_log(msg, log: devLog, type: .debug, "shouldRecognizeSimultaneouslyWith", otherGestureRecognizer) */
 
         switch otherGestureRecognizer {
         case is FloatingPanelPanGestureRecognizer:
@@ -339,7 +339,10 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                     if surfaceView.grabberAreaContains(gestureRecognizer.location(in: surfaceView)) {
                         return false
                     }
-                    return allowScrollPanGesture(for: scrollView)
+                    guard state == layoutAdapter.mostExpandedState else { return false }
+                    // The condition where offset > 0 must not be included here. Because it will stop recognizing
+                    // the panel pan gesture if a user starts scrolling content from an offset greater than 0.
+                    return allowScrollPanGesture(of: scrollView) { offset in offset <= scrollBounceThreshold  }
                 default:
                     return false
                 }
@@ -390,23 +393,24 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             let velocity = value(of: panGesture.velocity(in: panGesture.view))
             let location = panGesture.location(in: surfaceView)
 
-            let belowEdgeMost = 0 > layoutAdapter.offsetFromMostExpandedAnchor + (1.0 / surfaceView.fp_displayScale)
+            let insideMostExpandedAnchor = 0 > layoutAdapter.offsetFromMostExpandedAnchor + (1.0 / surfaceView.fp_displayScale)
 
-            log.debug("""
+            os_log(msg, log: devLog, type: .debug, """
                 scroll gesture(\(state):\(panGesture.state)) -- \
-                belowTop = \(belowEdgeMost), \
+                inside expanded anchor = \(insideMostExpandedAnchor), \
                 interactionInProgress = \(interactionInProgress), \
                 scroll offset = \(value(of: scrollView.contentOffset)), \
                 location = \(value(of: location)), velocity = \(velocity)
-                """)
+                """
+            )
 
             let offsetDiff = value(of: scrollView.contentOffset - contentOffsetForPinning(of: scrollView))
 
-            if belowEdgeMost {
+            if insideMostExpandedAnchor {
                 // Scroll offset pinning
                 if state == layoutAdapter.mostExpandedState {
                     if interactionInProgress {
-                        log.debug("settle offset --", value(of: initialScrollOffset))
+                        os_log(msg, log: devLog, type: .debug, "settle offset -- \(value(of: initialScrollOffset))")
                         stopScrolling(at: initialScrollOffset)
                     } else {
                         if surfaceView.grabberAreaContains(location) {
@@ -458,21 +462,24 @@ class Core: NSObject, UIGestureRecognizerDelegate {
                     }
                 } else {
                     if state == layoutAdapter.mostExpandedState {
+                        let allowScroll = allowScrollPanGesture(of: scrollView) { offset in
+                            offset <= scrollBounceThreshold || 0 < offset
+                        }
                         switch layoutAdapter.position {
                         case .top, .left:
-                            if velocity < 0, !allowScrollPanGesture(for: scrollView) {
-                                lockScrollView()
+                            if velocity < 0, !allowScroll {
+                                lockScrollView(strict: true)
                             }
-                            if velocity > 0, allowScrollPanGesture(for: scrollView) {
+                            if velocity > 0, allowScroll {
                                 unlockScrollView()
                             }
                         case .bottom, .right:
                             // Hide a scroll indicator just before starting an interaction by swiping a panel down.
-                            if velocity > 0, !allowScrollPanGesture(for: scrollView) {
-                                lockScrollView()
+                            if velocity > 0, !allowScroll {
+                                lockScrollView(strict: true)
                             }
                             // Show a scroll indicator when an animation is interrupted at the top and content is scrolled up
-                            if velocity < 0, allowScrollPanGesture(for: scrollView) {
+                            if velocity < 0, allowScroll {
                                 unlockScrollView()
                             }
                         }
@@ -488,7 +495,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             let velocity = panGesture.velocity(in: panGesture.view)
             let location = panGesture.location(in: panGesture.view)
 
-            log.debug("""
+            os_log(msg, log: devLog, type: .debug, """
                 panel gesture(\(state):\(panGesture.state)) -- \
                 translation =  \(value(of: translation)), \
                 location = \(value(of: location)), \
@@ -538,13 +545,13 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
     private func interruptAnimationIfNeeded() {
         if let animator = self.moveAnimator, animator.isRunning {
-            log.debug("the attraction animator interrupted!!!")
+            os_log(msg, log: devLog, type: .debug, "the attraction animator interrupted!!!")
             animator.stopAnimation(true)
             endAttraction(false)
         }
         if let animator = self.transitionAnimator {
             guard 0 >= layoutAdapter.offsetFromMostExpandedAnchor else { return }
-            log.debug("a panel animation(interruptible: \(animator.isInterruptible)) interrupted!!!")
+            os_log(msg, log: devLog, type: .debug, "a panel animation(interruptible: \(animator.isInterruptible)) interrupted!!!")
             if animator.isInterruptible {
                 animator.stopAnimation(false)
                 // A user can stop a panel at the nearest Y of a target position so this fine-tunes
@@ -636,7 +643,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         // A user interaction does not always start from Began state of the pan gesture
         // because it can be recognized in scrolling a content in a content view controller.
         // So here just preserve the current state if needed.
-        log.debug("panningBegan -- location = \(value(of: location))")
+        os_log(msg, log: devLog, type: .debug, "panningBegan -- location = \(value(of: location))")
 
         guard let scrollView = scrollView else { return }
         if state == layoutAdapter.mostExpandedState {
@@ -649,7 +656,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     private func panningChange(with translation: CGPoint) {
-        log.debug("panningChange -- translation = \(value(of: translation))")
+        os_log(msg, log: devLog, type: .debug, "panningChange -- translation = \(value(of: translation))")
         let pre = value(of: layoutAdapter.surfaceLocation)
         let diff = value(of: translation - initialTranslation)
         let next = pre + diff
@@ -702,10 +709,10 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     private func panningEnd(with translation: CGPoint, velocity: CGPoint) {
-        log.debug("panningEnd -- translation = \(value(of: translation)), velocity = \(value(of: velocity))")
+        os_log(msg, log: devLog, type: .debug, "panningEnd -- translation = \(value(of: translation)), velocity = \(value(of: velocity))")
 
         if state == .hidden {
-            log.debug("Already hidden")
+            os_log(msg, log: devLog, type: .debug, "Already hidden")
             return
         }
 
@@ -794,7 +801,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
     private func startInteraction(with translation: CGPoint, at location: CGPoint) {
         /* Don't lock a scroll view to show a scroll indicator after hitting the top */
-        log.debug("startInteraction  -- translation = \(value(of: translation)), location = \(value(of: location))")
+        os_log(msg, log: devLog, type: .debug, "startInteraction  -- translation = \(value(of: translation)), location = \(value(of: location))")
         guard interactionInProgress == false else { return }
 
         var offset: CGPoint = .zero
@@ -804,22 +811,28 @@ class Core: NSObject, UIGestureRecognizerDelegate {
             if surfaceView.grabberAreaContains(location) {
                 initialScrollOffset = scrollView.contentOffset
             } else {
-                initialScrollOffset = scrollView.contentOffset
-                let offsetDiff = scrollView.contentOffset - contentOffsetForPinning(of: scrollView)
+                let pinningOffset = contentOffsetForPinning(of: scrollView)
+                
+                // `initialScrollOffset` must be reset to the pinning offset because the value of `scrollView.contentOffset`,
+                // for instance, is a value in [-30, 0) on a bottom positioned panel with `allowScrollPanGesture(of:condition:)`.
+                // If it's not reset, the following logic to shift the surface frame will not work and then the scroll
+                // content offset will become an unexpected value.
+                initialScrollOffset = pinningOffset
+
+                // Shift the surface frame to negate the scroll content offset at startInteraction(at:offset:)
+                let offsetDiff = scrollView.contentOffset - pinningOffset
                 switch layoutAdapter.position {
                 case .top, .left:
-                    // Fit the surface bounds to a scroll offset content by startInteraction(at:offset:)
                     if value(of: offsetDiff) > 0 {
                         offset = -offsetDiff
                     }
                 case .bottom, .right:
-                    // Fit the surface bounds to a scroll offset content by startInteraction(at:offset:)
                     if value(of: offsetDiff) < 0 {
                         offset = -offsetDiff
                     }
                 }
             }
-            log.debug("initial scroll offset --", initialScrollOffset)
+            os_log(msg, log: devLog, type: .debug, "initial scroll offset -- \(initialScrollOffset)")
         }
 
         initialTranslation = translation
@@ -836,10 +849,10 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     private func endInteraction(for targetPosition: FloatingPanelState) {
-        log.debug("endInteraction to \(targetPosition)")
+        os_log(msg, log: devLog, type: .debug, "endInteraction to \(targetPosition)")
 
         if let scrollView = scrollView {
-            log.debug("endInteraction -- scroll offset = \(scrollView.contentOffset)")
+            os_log(msg, log: devLog, type: .debug, "endInteraction -- scroll offset = \(scrollView.contentOffset)")
         }
 
         interactionInProgress = false
@@ -867,7 +880,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     private func startAttraction(to targetPosition: FloatingPanelState, with velocity: CGPoint) {
-        log.debug("startAnimation to \(targetPosition) -- velocity = \(value(of: velocity))")
+        os_log(msg, log: devLog, type: .debug, "startAnimation to \(targetPosition) -- velocity = \(value(of: velocity))")
         guard let vc = ownerVC else { return }
 
         isAttracting = true
@@ -915,18 +928,20 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         }
 
         if let scrollView = scrollView {
-            log.debug("finishAnimation -- scroll offset = \(scrollView.contentOffset)")
+            os_log(msg, log: devLog, type: .debug, "finishAnimation -- scroll offset = \(scrollView.contentOffset)")
         }
 
         stopScrollDeceleration = false
 
-        log.debug("""
+        os_log(msg, log: devLog, type: .debug, """
             finishAnimation -- state = \(state) \
             surface location = \(layoutAdapter.surfaceLocation) \
             edge most position = \(layoutAdapter.surfaceLocation(for: layoutAdapter.mostExpandedState))
             """)
         if finished, state == layoutAdapter.mostExpandedState, abs(layoutAdapter.offsetFromMostExpandedAnchor) <= 1.0 {
             unlockScrollView()
+        } else if finished, shouldLooselyLockScrollView {
+            unlockScrollView()
         }
     }
 
@@ -934,6 +949,10 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         return layoutAdapter.position.mainLocation(point)
     }
 
+    func value(of size: CGSize) -> CGFloat {
+        return layoutAdapter.position.mainDimension(size)
+    }
+
     func setValue(_ newValue: CGPoint, to point: inout CGPoint) {
         switch layoutAdapter.position {
         case .top, .bottom:
@@ -950,7 +969,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     func targetPosition(from currentY: CGFloat, with velocity: CGFloat) -> (FloatingPanelState) {
-        log.debug("targetPosition -- currentY = \(currentY), velocity = \(velocity)")
+        os_log(msg, log: devLog, type: .debug, "targetPosition -- currentY = \(currentY), velocity = \(velocity)")
 
         let sortedPositions = layoutAdapter.sortedAnchorStatesByCoordinate
 
@@ -976,7 +995,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         (fromPos, toPos) = forwardY ? (lowerPos, upperPos) : (upperPos, lowerPos)
 
         if behaviorAdapter.shouldProjectMomentum(to: toPos) == false {
-            log.debug("targetPosition -- negate projection: distance = \(distance)")
+            os_log(msg, log: devLog, type: .debug, "targetPosition -- negate projection: distance = \(distance)")
             let segment = layoutAdapter.segment(at: currentY, forward: forwardY)
             var (lowerPos, upperPos) = (segment.lower ?? sortedPositions.first!, segment.upper ?? sortedPositions.last!)
             // Equate the segment out of {top,bottom} most state to the {top,bottom} most segment
@@ -1005,37 +1024,76 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
     // MARK: - ScrollView handling
 
-    private func lockScrollView() {
+    func followScrollViewBouncing() {
+        guard let scrollView = scrollView else {
+            return
+        }
+        let contentOffset = scrollView.contentOffset.y
+        guard contentOffset < 0, layoutAdapter.position == .bottom, state == layoutAdapter.mostExpandedState else {
+            if surfaceView.transform != .identity {
+                surfaceView.transform = .identity
+                scrollView.transform = .identity
+            }
+            return
+        }
+        surfaceView.transform = CGAffineTransform(translationX: 0, y: -contentOffset)
+        scrollView.transform = CGAffineTransform(translationX: 0, y: contentOffset)
+    }
+
+    private func lockScrollView(strict: Bool = false) {
         guard let scrollView = scrollView else { return }
 
         if scrollView.isLocked {
-            log.debug("Already scroll locked.")
+            os_log(msg, log: devLog, type: .debug, "Already scroll locked.")
             return
         }
-        log.debug("lock scroll view")
+        os_log(msg, log: devLog, type: .debug, "lock scroll view")
 
-        scrollBounce = scrollView.bounces
         scrollIndictorVisible = scrollView.showsVerticalScrollIndicator
 
+        if !strict, shouldLooselyLockScrollView {
+            // Don't change its `bounces` property. If it's changed, it will cause its scroll content offset jump at
+            // the most expanded anchor position while seamlessly scrolling content. This problem only occurs where its
+            // content mode is `.fitToBounds` and the tracking scroll content is smaller than the content view size.
+            // The reason why is because `bounces` prop change leads to the "content frame" change on `.fitToBounds`.
+            // See also https://github.com/scenee/FloatingPanel/issues/524.
+        } else {
+            scrollBounce = scrollView.bounces
+            scrollView.bounces = false
+        }
         scrollView.isDirectionalLockEnabled = true
-        scrollView.bounces = false
         scrollView.showsVerticalScrollIndicator = false
     }
 
     private func unlockScrollView() {
         guard let scrollView = scrollView, scrollView.isLocked else { return }
-        log.debug("unlock scroll view")
+        os_log(msg, log: devLog, type: .debug, "unlock scroll view")
 
-        scrollView.isDirectionalLockEnabled = false
         scrollView.bounces = scrollBounce
+        scrollView.isDirectionalLockEnabled = false
         scrollView.showsVerticalScrollIndicator = scrollIndictorVisible
     }
 
+    private var shouldLooselyLockScrollView: Bool {
+        var isSmallScrollContentAndFitToBoundsMode: Bool {
+            if ownerVC?.contentMode == .fitToBounds, let scrollView = scrollView,
+               value(of: scrollView.contentSize) < value(of: scrollView.bounds.size) - min(layoutAdapter.offsetFromMostExpandedAnchor, 0) {
+                return true
+            }
+            return false
+        }
+        return isSmallScrollContentAndFitToBoundsMode
+    }
+
     private func stopScrolling(at contentOffset: CGPoint) {
         // Must use setContentOffset(_:animated) to force-stop deceleration
         guard let scrollView = scrollView else { return }
         var offset = scrollView.contentOffset
-        setValue(contentOffset, to: &offset)
+        if contentOffset.y >= 0 {
+            setValue(contentOffset, to: &offset)
+        } else {
+            offset = CGPoint(x: 0, y: 0)
+        }
         scrollView.setContentOffset(offset, animated: false)
     }
 
@@ -1055,16 +1113,15 @@ class Core: NSObject, UIGestureRecognizerDelegate {
         }
     }
 
-    private func allowScrollPanGesture(for scrollView: UIScrollView) -> Bool {
-        guard state == layoutAdapter.mostExpandedState else { return false }
-        var offsetY: CGFloat = 0
+    private func allowScrollPanGesture(of scrollView: UIScrollView, condition: (_ offset: CGFloat) -> Bool) -> Bool {
+        var offset: CGFloat = 0
         switch layoutAdapter.position {
         case .top, .left:
-            offsetY = value(of: scrollView.fp_contentOffsetMax - scrollView.contentOffset)
+            offset = value(of: scrollView.fp_contentOffsetMax - scrollView.contentOffset)
         case .bottom, .right:
-            offsetY = value(of: scrollView.contentOffset - contentOffsetForPinning(of: scrollView))
+            offset = value(of: scrollView.contentOffset - contentOffsetForPinning(of: scrollView))
         }
-        return offsetY <= -30.0 || offsetY > 0
+        return condition(offset)
     }
 
     // MARK: - UIPanGestureRecognizer Intermediation
@@ -1188,7 +1245,7 @@ private class NumericSpringAnimator: NSObject {
         if isRunning {
             return false
         }
-        log.debug("startAnimation --", displayLink)
+        os_log(msg, log: devLog, type: .debug, "startAnimation --", displayLink)
         isRunning = true
         displayLink.add(to: RunLoop.main, forMode: .common)
         return true
@@ -1200,7 +1257,7 @@ private class NumericSpringAnimator: NSObject {
             if locked { lock.unlock() }
         }
 
-        log.debug("stopAnimation --", displayLink)
+        os_log(msg, log: devLog, type: .debug, "stopAnimation --", displayLink)
         isRunning = false
         displayLink.invalidate()
         if withoutFinishing {

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>2.5.5</string>
+	<string>2.6.4</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 {
@@ -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)
     }
@@ -330,12 +334,27 @@ 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
@@ -629,8 +648,9 @@ 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 +674,18 @@ 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 +704,14 @@ 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 +751,9 @@ 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)")
             }
         }
 
@@ -757,7 +788,7 @@ 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
@@ -43,3 +43,34 @@ extension FloatingPanelLayoutReferenceGuide {
         }
     }
 }
+
+/// 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.fp_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)
@@ -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
 

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 {
@@ -314,7 +330,6 @@ 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)

Tests/LayoutTests.swift

@@ -464,7 +464,6 @@ class LayoutTests: XCTestCase {
                 if #available(iOS 11, *) {
                     XCTAssertEqual(c.secondAnchor, prop.result.secondAnchor, line: UInt(prop.result.0))
                 }
-                print(c)
         }
     }
     func test_layoutAnchor_bottomPosition() {

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>