Update sample

GrabberHandleView supports UIAppearance
FloatingPanelBackdropView supports UIAppearance
2019-06-01 23:36:20 +09:00 · 2019-06-01 23:36:20 +09:00 · 2019-06-01 23:36:20 +09:00 · 2019-06-01 23:36:20 +09:00
30 changed files with 762 additions and 2184 deletions
@@ -22,40 +22,22 @@ jobs:
    osx_image: xcode10
    name: "Swift 4.2"
  - script: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.0 clean build
-    osx_image: xcode10.3
+    osx_image: xcode10.2
    name: "Swift 5.0"
-  - script: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.1 SUPPORTS_MACCATALYST=NO clean build
-    # SUPPORTS_MACCATALYST=NO because Xcode 11 runs on macOS 10.14 in Travis CI
-    osx_image: xcode11
-    name: "Swift 5.1"

  - stage: "Tests"
-    osx_image: xcode10.3
+    osx_image: xcode10.2
    script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=10.3.1,name=iPhone SE'
    name: "iPhone SE (iOS 10.3)"
  - script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=11.4,name=iPhone 7'
-    osx_image: xcode10.3
+    osx_image: xcode10.2
    name: "iPhone 7 (iOS 11.4)"
  - script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=12.2,name=iPhone X'
-    osx_image: xcode10.3
+    osx_image: xcode10.2
    name: "iPhone X (iOS 12.2)"
-  - script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=13.0,name=iPhone 11'
-    osx_image: xcode11
-    name: "iPhone X (iOS 13.0)"
-
-  - stage: Build examples
-    osx_image: xcode11
-    script: xcodebuild -scheme Maps -sdk iphonesimulator clean build
-    name: "Maps"
-  - script: xcodebuild -scheme Stocks -sdk iphonesimulator clean build
-    osx_image: xcode11
-    name: "Stocks"
-  - script: xcodebuild -scheme Samples -sdk iphonesimulator clean build
-    osx_image: xcode11
-    name: "Samples"

  - stage: Carthage
-    osx_image: xcode11
+    osx_image: xcode10.2
    before_install:
    - brew update
    - brew outdated carthage || brew upgrade carthage
@@ -63,9 +45,18 @@ jobs:
    - carthage build --no-skip-current

  - stage: CocoaPods
-    osx_image: xcode11
-    before_install: 
-    - gem install cocoapods
+    osx_image: xcode10.2
    script:
-    - pod spec lint --allow-warnings
-    - pod lib lint --allow-warnings
+    - pod spec lint
+    - pod lib lint
+
+  - stage: Build examples
+    osx_image: xcode10.2
+    script: xcodebuild -scheme Maps -sdk iphonesimulator clean build
+    name: "Maps"
+  - script: xcodebuild -scheme Stocks -sdk iphonesimulator clean build
+    osx_image: xcode10.2
+    name: "Stocks"
+  - script: xcodebuild -scheme Samples -sdk iphonesimulator clean build
+    osx_image: xcode10.2
+    name: "Samples"
@@ -7,13 +7,13 @@
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-		549D23D3233C77D5008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
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 		54B51134216C3D860033A6F3 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 54B51132216C3D860033A6F3 /* LaunchScreen.storyboard */; };
+		54B5113F216C407F0033A6F3 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 54B5113E216C407F0033A6F3 /* FloatingPanel.framework */; };
+		54B51140216C407F0033A6F3 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 54B5113E216C407F0033A6F3 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
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@@ -23,7 +23,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				549D23D3233C77D5008EF4D7 /* FloatingPanel.framework in Embed Frameworks */,
+				54B51140216C407F0033A6F3 /* FloatingPanel.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -31,7 +31,6 @@
 /* End PBXCopyFilesBuildPhase section */

 /* Begin PBXFileReference section */
-		549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		54B51126216C3D840033A6F3 /* Maps.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Maps.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		54B51129216C3D840033A6F3 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		54B5112B216C3D840033A6F3 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -39,6 +38,7 @@
 		54B51130216C3D860033A6F3 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		54B51133216C3D860033A6F3 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		54B51135216C3D860033A6F3 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		54B5113E216C407F0033A6F3 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */

 /* Begin PBXFrameworksBuildPhase section */
@@ -46,7 +46,7 @@
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 			buildActionMask = 2147483647;
 			files = (
-				549D23D2233C77D5008EF4D7 /* FloatingPanel.framework in Frameworks */,
+				54B5113F216C407F0033A6F3 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -56,7 +56,7 @@
 		54B5111D216C3D840033A6F3 = {
 			isa = PBXGroup;
 			children = (
-				549D23D1233C77D5008EF4D7 /* FloatingPanel.framework */,
+				54B5113E216C407F0033A6F3 /* FloatingPanel.framework */,
 				54B51128216C3D840033A6F3 /* Maps */,
 				54B51127216C3D840033A6F3 /* Products */,
 			);
@@ -148,9 +148,11 @@ class SearchPanelViewController: UIViewController, UITableViewDataSource, UITabl
        tableView.dataSource = self
        tableView.delegate = self
        searchBar.placeholder = "Search for a place or address"
-        searchBar.setSearchText(fontSize: 15.0)
+        let textField = searchBar.value(forKey: "_searchField") as! UITextField
+        textField.font = UIFont(name: textField.font!.fontName, size: 15.0)

        hideHeader()
+
    }

    override func viewDidLayoutSubviews() {
@@ -272,15 +274,3 @@ class SearchHeaderView: UIView {
        self.clipsToBounds = true
    }
 }
-
-extension UISearchBar {
-    func setSearchText(fontSize: CGFloat) {
-        #if swift(>=5.1) // Xcode 11 or later
-            let font = searchTextField.font
-            searchTextField.font = font?.withSize(fontSize)
-        #else
-            let textField = value(forKey: "_searchField") as! UITextField
-            textField.font = textField.font?.withSize(fontSize)
-        #endif
-    }
-}
@@ -14,9 +14,9 @@
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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 */; };
-		549D23CB233C7779008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; };
-		549D23CC233C7779008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		54B51116216AFE5F0033A6F3 /* UIExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B51115216AFE5F0033A6F3 /* UIExtensions.swift */; };
+		54B5113C216C40670033A6F3 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 54B5113B216C40670033A6F3 /* FloatingPanel.framework */; };
+		54B5113D216C40670033A6F3 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 54B5113B216C40670033A6F3 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		54CDC5D8215BBE23007D205C /* UIComponents.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D7215BBE23007D205C /* UIComponents.swift */; };
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@@ -38,13 +38,13 @@
 /* End PBXContainerItemProxy section */

 /* Begin PBXCopyFilesBuildPhase section */
-		549D23CD233C7779008EF4D7 /* Embed Frameworks */ = {
+		54B5111C216C3B300033A6F3 /* Embed Frameworks */ = {
 			isa = PBXCopyFilesBuildPhase;
 			buildActionMask = 2147483647;
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				549D23CC233C7779008EF4D7 /* FloatingPanel.framework in Embed Frameworks */,
+				54B5113D216C40670033A6F3 /* FloatingPanel.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -65,8 +65,8 @@
 		545DBA0921511E6400CA77B8 /* SamplesUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = SamplesUITests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		545DBA0D21511E6400CA77B8 /* SampleUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SampleUITests.swift; sourceTree = "<group>"; };
 		545DBA0F21511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		549D23CA233C7779008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		54B51115216AFE5F0033A6F3 /* UIExtensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIExtensions.swift; sourceTree = "<group>"; };
+		54B5113B216C40670033A6F3 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		54CDC5D7215BBE23007D205C /* UIComponents.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIComponents.swift; sourceTree = "<group>"; };
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@@ -75,7 +75,7 @@
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 			buildActionMask = 2147483647;
 			files = (
-				549D23CB233C7779008EF4D7 /* FloatingPanel.framework in Frameworks */,
+				54B5113C216C40670033A6F3 /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -99,11 +99,12 @@
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 			isa = PBXGroup;
 			children = (
-				549D23CA233C7779008EF4D7 /* FloatingPanel.framework */,
+				54B5113B216C40670033A6F3 /* FloatingPanel.framework */,
 				545DB9EC21511E6300CA77B8 /* Sources */,
 				545DBA0121511E6400CA77B8 /* Tests */,
 				545DBA0C21511E6400CA77B8 /* UITests */,
 				545DB9EB21511E6300CA77B8 /* Products */,
+				545DBA1B2151CC1000CA77B8 /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -150,6 +151,13 @@
 			path = UITests;
 			sourceTree = "<group>";
 		};
+		545DBA1B2151CC1000CA77B8 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
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@@ -161,7 +169,7 @@
 				545DB9E621511E6300CA77B8 /* Sources */,
 				545DB9E721511E6300CA77B8 /* Frameworks */,
 				545DB9E821511E6300CA77B8 /* Resources */,
-				549D23CD233C7779008EF4D7 /* Embed Frameworks */,
+				54B5111C216C3B300033A6F3 /* Embed Frameworks */,
 			);
 			buildRules = (
 			);
@@ -4,8 +4,18 @@
 //

 import UIKit
+import FloatingPanel

@UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+        FloatingPanelSurfaceView.appearance().shadowHidden = false
+        FloatingPanelSurfaceView.appearance().cornerRadius = 6.0
+        // FloatingPanelSurfaceView.appearance().backgroundColor = .lightGray
+        // FloatingPanelBackdropView.appearance().backgroundColor = .red
+        // GrabberHandleView.appearance().barColor = .red
+        return true
+    }
 }
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" 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="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
    <device id="retina5_9" orientation="portrait">
        <adaptation id="fullscreen"/>
    </device>
    <dependencies>
        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
@@ -35,18 +35,18 @@
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="7IS-PU-x0P">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                                <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                <prototypes>
                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="Cell" textLabel="M0G-C8-hAO" style="IBUITableViewCellStyleDefault" id="ySY-oA-g81">
-                                        <rect key="frame" x="0.0" y="28" width="375" height="43.666667938232422"/>
+                                        <rect key="frame" x="0.0" y="28" width="375" height="44"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="ySY-oA-g81" id="sXB-nH-2g2">
-                                            <rect key="frame" x="0.0" y="0.0" width="375" height="43.666667938232422"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="43.666666666666664"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" insetsLayoutMarginsFromSafeArea="NO" text="Title" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="M0G-C8-hAO">
-                                                    <rect key="frame" x="15" y="0.0" width="345" height="43.666667938232422"/>
+                                                    <rect key="frame" x="15" y="0.0" width="345" height="43.666666666666664"/>
                                                    <autoresizingMask key="autoresizingMask"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                    <nil key="textColor"/>
@@ -62,7 +62,7 @@
                        <constraints>
                            <constraint firstItem="7IS-PU-x0P" firstAttribute="top" secondItem="Smh-Bd-AAc" secondAttribute="top" id="6yd-jv-ey3"/>
                            <constraint firstItem="7IS-PU-x0P" firstAttribute="leading" secondItem="39L-Nq-qfp" secondAttribute="leading" id="Z6Y-Dc-cei"/>
-                            <constraint firstItem="7IS-PU-x0P" firstAttribute="bottom" secondItem="Smh-Bd-AAc" secondAttribute="bottom" id="fNW-DP-lhV"/>
+                            <constraint firstItem="7IS-PU-x0P" firstAttribute="bottom" secondItem="39L-Nq-qfp" secondAttribute="bottom" id="fNW-DP-lhV"/>
                            <constraint firstItem="7IS-PU-x0P" firstAttribute="trailing" secondItem="39L-Nq-qfp" secondAttribute="trailing" id="vfY-Rc-FOI"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="39L-Nq-qfp"/>
@@ -87,35 +87,35 @@
            <objects>
                <viewController storyboardIdentifier="SettingsViewController" id="C1X-9Z-TyQ" customClass="SettingsViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="af9-Zr-Ppc">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="197.33333333333334"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="197.33000000000001"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" alignment="center" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="n93-ZL-fmC">
-                                <rect key="frame" x="32" y="16" width="311" height="181.33333333333334"/>
+                                <rect key="frame" x="32" y="16" width="311" height="147.33333333333334"/>
                                <subviews>
                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Version: 1.0" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WmC-Tq-NDN">
-                                        <rect key="frame" x="118.33333333333334" y="0.0" width="74.333333333333343" height="21"/>
+                                        <rect key="frame" x="118.33333333333334" y="0.0" width="74.333333333333343" height="17"/>
                                        <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                        <nil key="textColor"/>
                                        <nil key="highlightedColor"/>
                                    </label>
                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="UINavigationBar" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Ulg-gS-ah0">
-                                        <rect key="frame" x="90.666666666666686" y="37" width="130" height="25"/>
+                                        <rect key="frame" x="90.666666666666686" y="33" width="130" height="20.333333333333329"/>
                                        <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                        <nil key="textColor"/>
                                        <nil key="highlightedColor"/>
                                    </label>
                                    <stackView opaque="NO" contentMode="scaleToFill" alignment="center" spacing="126" translatesAutoresizingMaskIntoConstraints="NO" id="uEf-g4-CeU">
-                                        <rect key="frame" x="23.333333333333343" y="78" width="264.66666666666663" height="38"/>
+                                        <rect key="frame" x="23.333333333333343" y="69.333333333333329" width="264.33333333333326" height="31"/>
                                        <subviews>
                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Large Titles" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ogl-S5-4tJ">
-                                                <rect key="frame" x="0.0" y="8.9999999999999982" width="89.666666666666671" height="20.333333333333329"/>
+                                                <rect key="frame" x="0.0" y="5.3333333333333428" width="89.333333333333329" height="20.333333333333332"/>
                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                <nil key="textColor"/>
                                                <nil key="highlightedColor"/>
                                            </label>
                                            <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="js8-Qv-lUC">
-                                                <rect key="frame" x="215.66666666666666" y="3.6666666666666714" width="50.999999999999972" height="31"/>
+                                                <rect key="frame" x="215.33333333333334" y="0.0" width="51.000000000000028" height="31"/>
                                                <connections>
                                                    <action selector="toggleLargeTitle:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="FJS-Ty-mCY"/>
                                                </connections>
@@ -123,16 +123,16 @@
                                        </subviews>
                                    </stackView>
                                    <stackView opaque="NO" contentMode="scaleToFill" spacing="126" translatesAutoresizingMaskIntoConstraints="NO" id="ZtZ-Dz-4cC">
-                                        <rect key="frame" x="23.333333333333343" y="132" width="264.66666666666663" height="49.333333333333343"/>
+                                        <rect key="frame" x="23.333333333333343" y="116.33333333333334" width="264.66666666666663" height="31"/>
                                        <subviews>
                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Translucent" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Z5i-rm-QgL">
-                                                <rect key="frame" x="0.0" y="0.0" width="89.666666666666671" height="49.333333333333336"/>
+                                                <rect key="frame" x="0.0" y="0.0" width="89.666666666666671" height="31"/>
                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                <nil key="textColor"/>
                                                <nil key="highlightedColor"/>
                                            </label>
                                            <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="s6b-j9-8Kw">
-                                                <rect key="frame" x="215.66666666666666" y="0.0" width="50.999999999999972" height="49.333333333333336"/>
+                                                <rect key="frame" x="215.66666666666666" y="0.0" width="50.999999999999972" height="31"/>
                                                <connections>
                                                    <action selector="toggleTranslucent:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="nL4-3L-9hh"/>
                                                </connections>
@@ -309,22 +309,22 @@
            <objects>
                <viewController storyboardIdentifier="ModalViewController" id="bYI-y3-Rzb" customClass="ModalViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="qwo-GK-p1U">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="724"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="vut-mK-Y4t" customClass="SafeAreaView" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="0.0" y="724" width="375" height="0.0"/>
+                                <rect key="frame" x="0.0" y="744" width="375" height="34"/>
                                <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                            </view>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sbF-Az-7sy">
-                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
+                                <rect key="frame" x="20" y="44" width="39" height="30"/>
                                <state key="normal" title="Close"/>
                                <connections>
                                    <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="MSC-ch-YJK"/>
                                </connections>
                            </button>
                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="top" spacing="44" translatesAutoresizingMaskIntoConstraints="NO" id="9p4-06-y2T">
-                                <rect key="frame" x="134.66666666666666" y="88" width="106" height="326"/>
+                                <rect key="frame" x="139.66666666666666" y="132" width="96" height="252"/>
                                <subviews>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="i9x-x5-n1q">
                                        <rect key="frame" x="0.0" y="0.0" width="80" height="30"/>
@@ -347,15 +347,8 @@
                                            <action selector="moveToTipWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="BmL-91-9ai"/>
                                        </connections>
                                    </button>
-                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="swr-XM-GzZ">
-                                        <rect key="frame" x="0.0" y="222" width="106" height="30"/>
-                                        <state key="normal" title="Move to hidden"/>
-                                        <connections>
-                                            <action selector="moveToHiddenWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="jfJ-0f-fdk"/>
-                                        </connections>
-                                    </button>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="szf-HE-QTk">
-                                        <rect key="frame" x="0.0" y="296" width="96" height="30"/>
+                                        <rect key="frame" x="0.0" y="222" width="96" height="30"/>
                                        <state key="normal" title="Update layout"/>
                                        <connections>
                                            <action selector="updateLayout:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="Woz-a7-YMJ"/>
@@ -524,7 +517,7 @@
                                </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="44" width="375" height="734"/>
+                                <rect key="frame" x="0.0" y="44" width="375" height="700"/>
                                <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="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="noi-1a-5bZ" customClass="CloseButton" customModule="Samples" customModuleProvider="target">
@@ -537,23 +530,6 @@
                                    <action selector="closeWithSender:" destination="YC8-ae-15L" eventType="touchUpInside" id="Z2v-19-S5k"/>
                                </connections>
                            </button>
-                            <stackView opaque="NO" contentMode="scaleToFill" distribution="fillProportionally" alignment="center" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="qux-uG-4o2">
-                                <rect key="frame" x="8" y="52" width="148.33333333333334" height="31"/>
-                                <subviews>
-                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="fitToBounds" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7lq-d3-PKi">
-                                        <rect key="frame" x="0.0" y="5.3333333333333357" width="91.333333333333329" height="20.333333333333332"/>
-                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                        <nil key="textColor"/>
-                                        <nil key="highlightedColor"/>
-                                    </label>
-                                    <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="0MA-lV-KjS">
-                                        <rect key="frame" x="99.333333333333329" y="0.0" width="50.999999999999986" height="31"/>
-                                        <connections>
-                                            <action selector="modeChanged:" destination="YC8-ae-15L" eventType="valueChanged" id="IQ8-u2-Rib"/>
-                                        </connections>
-                                    </switch>
-                                </subviews>
-                            </stackView>
                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="22" translatesAutoresizingMaskIntoConstraints="NO" id="tP3-oJ-4EB">
                                <rect key="frame" x="130.66666666666666" y="132" width="114" height="134"/>
                                <subviews>
@@ -594,11 +570,9 @@
                            <constraint firstItem="tP3-oJ-4EB" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" constant="88" id="Zhb-Ss-epe"/>
                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="trailing" secondItem="aOK-7l-cA6" secondAttribute="trailing" id="kkp-Yo-FQW"/>
                            <constraint firstItem="aOK-7l-cA6" firstAttribute="trailing" secondItem="noi-1a-5bZ" secondAttribute="trailing" constant="12" id="lv9-Nf-HNB"/>
-                            <constraint firstItem="qux-uG-4o2" firstAttribute="top" secondItem="aOK-7l-cA6" secondAttribute="top" constant="8" id="naa-cf-ZIc"/>
                            <constraint firstItem="Kva-Z7-0qY" firstAttribute="leading" secondItem="aOK-7l-cA6" secondAttribute="leading" id="oVC-i1-TwS"/>
                            <constraint firstItem="aOK-7l-cA6" firstAttribute="bottom" secondItem="Kva-Z7-0qY" secondAttribute="bottom" id="rW2-mF-5DR"/>
                            <constraint firstItem="8yw-OC-Ubk" firstAttribute="top" relation="greaterThanOrEqual" secondItem="tP3-oJ-4EB" secondAttribute="bottom" constant="88" id="vKQ-h9-uKt"/>
-                            <constraint firstItem="qux-uG-4o2" firstAttribute="leading" secondItem="g7l-kO-y7q" secondAttribute="leading" constant="8" id="zXb-R9-bMO"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="aOK-7l-cA6"/>
                        <connections>
@@ -610,8 +584,6 @@
                    <size key="freeformSize" width="375" height="778"/>
                    <connections>
                        <outlet property="closeButton" destination="noi-1a-5bZ" id="eWQ-ha-8y7"/>
-                        <outlet property="intrinsicHeightConstraint" destination="vKQ-h9-uKt" id="QpA-WD-b17"/>
-                        <outlet property="modeChangeView" destination="qux-uG-4o2" id="1Nq-fE-dXw"/>
                        <segue destination="bYI-y3-Rzb" kind="show" identifier="ShowSegue" id="r1P-2i-NDe"/>
                    </connections>
                </viewController>
@@ -632,7 +604,7 @@
                    </connections>
                </pongPressGestureRecognizer>
            </objects>
-            <point key="canvasLocation" x="653.60000000000002" y="733.74384236453204"/>
+            <point key="canvasLocation" x="655" y="734"/>
        </scene>
        <!--Debug Text View Controller-->
        <scene sceneID="Bkq-O7-q4A">
@@ -17,15 +17,13 @@ class SampleListViewController: UIViewController {
        case trackingTextView
        case showDetail
        case showModal
-        case showPanelModal
+        case showFloatingPanelModal
        case showTabBar
        case showPageView
-        case showPageContentView
        case showNestedScrollView
        case showRemovablePanel
        case showIntrinsicView
        case showContentInset
-        case showContainerMargins

        var name: String {
            switch self {
@@ -33,15 +31,13 @@ class SampleListViewController: UIViewController {
            case .trackingTextView: return "Scroll tracking(TextView)"
            case .showDetail: return "Show Detail Panel"
            case .showModal: return "Show Modal"
-            case .showPanelModal: return "Show Panel Modal"
+            case .showFloatingPanelModal: return "Show Floating Panel Modal"
            case .showTabBar: return "Show Tab Bar"
            case .showPageView: return "Show Page View"
-            case .showPageContentView: return "Show Page Content View"
            case .showNestedScrollView: return "Show Nested ScrollView"
            case .showRemovablePanel: return "Show Removable Panel"
            case .showIntrinsicView: return "Show Intrinsic View"
            case .showContentInset: return "Show with ContentInset"
-            case .showContainerMargins: return "Show with ContainerMargins"
            }
        }

@@ -51,15 +47,13 @@ class SampleListViewController: UIViewController {
            case .trackingTextView: return "ConsoleViewController"
            case .showDetail: return "DetailViewController"
            case .showModal: return "ModalViewController"
-            case .showPanelModal: return nil
+            case .showFloatingPanelModal: return nil
            case .showTabBar: return "TabBarViewController"
            case .showPageView: return nil
-            case .showPageContentView: return nil
            case .showNestedScrollView: return "NestedScrollViewController"
            case .showRemovablePanel: return "DetailViewController"
            case .showIntrinsicView: return "IntrinsicViewController"
            case .showContentInset: return nil
-            case .showContainerMargins: return nil
            }
        }
    }
@@ -73,7 +67,18 @@ class SampleListViewController: UIViewController {
    var mainPanelObserves: [NSKeyValueObservation] = []
    var settingsObserves: [NSKeyValueObservation] = []

-    var pages: [UIViewController] = []
+    lazy var pages: [UIViewController] = {
+        let page1 = FloatingPanelController(delegate: self)
+        page1.view.backgroundColor = .blue
+        page1.show()
+        let page2 = FloatingPanelController(delegate: self)
+        page2.view.backgroundColor = .red
+        page2.show()
+        let page3 = FloatingPanelController(delegate: self)
+        page3.view.backgroundColor = .green
+        page3.show()
+        return [page1, page2, page3]
+    }()

    override func viewDidLoad() {
        super.viewDidLoad()
@@ -114,16 +119,10 @@ class SampleListViewController: UIViewController {
    func addMainPanel(with contentVC: UIViewController) {
        mainPanelObserves.removeAll()

-        let oldMainPanelVC = mainPanelVC
-
        // Initialize FloatingPanelController
        mainPanelVC = FloatingPanelController()
        mainPanelVC.delegate = self

-        // Initialize FloatingPanelController and add the view
-        mainPanelVC.surfaceView.cornerRadius = 6.0
-        mainPanelVC.surfaceView.shadowHidden = false
-
        // Set a content view controller
        mainPanelVC.set(contentViewController: contentVC)

@@ -134,10 +133,6 @@ class SampleListViewController: UIViewController {
            tapGesture.cancelsTouchesInView = false
            tapGesture.numberOfTapsRequired = 2
            mainPanelVC.surfaceView.addGestureRecognizer(tapGesture)
-        case .showPageContentView:
-            if let page = (mainPanelVC.contentViewController as? UIPageViewController)?.viewControllers?.first {
-                mainPanelVC.track(scrollView: (page as! DebugTableViewController).tableView)
-            }
        case .showRemovablePanel, .showIntrinsicView:
            mainPanelVC.isRemovalInteractionEnabled = true

@@ -165,13 +160,7 @@ class SampleListViewController: UIViewController {
        }

        //  Add FloatingPanel to self.view
-        if let oldMainPanelVC = oldMainPanelVC {
-            oldMainPanelVC.removePanelFromParent(animated: true, completion: {
-                self.mainPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
-            })
-        } else {
-            mainPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
-        }
+        mainPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
    }

    @objc
@@ -258,8 +247,6 @@ extension SampleListViewController: UITableViewDelegate {
        }()

        self.currentMenu = menu
-        detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
-        detailPanelVC = nil

        switch menu {
        case .showDetail:
@@ -267,7 +254,6 @@ extension SampleListViewController: UITableViewDelegate {

            // Initialize FloatingPanelController
            detailPanelVC = FloatingPanelController()
-            detailPanelVC.delegate = self

            // Initialize FloatingPanelController and add the view
            detailPanelVC.surfaceView.cornerRadius = 6.0
@@ -276,24 +262,13 @@ extension SampleListViewController: UITableViewDelegate {
            // Set a content view controller
            detailPanelVC.set(contentViewController: contentVC)

-            detailPanelVC.contentMode = .fitToBounds
-            (contentVC as? DetailViewController)?.intrinsicHeightConstraint.priority = .defaultLow
-
            //  Add FloatingPanel to self.view
            detailPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
        case .showModal, .showTabBar:
            let modalVC = contentVC
-            modalVC.modalPresentationStyle = .fullScreen
            present(modalVC, animated: true, completion: nil)

        case .showPageView:
-            pages = [UIColor.blue, .red, .green].compactMap({ (color) -> UIViewController in
-                let page = FloatingPanelController(delegate: self)
-                page.view.backgroundColor = color
-                page.show()
-                return page
-            })
-
            let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
            let closeButton = UIButton(type: .custom)
            pageVC.view.addSubview(closeButton)
@@ -306,21 +281,11 @@ extension SampleListViewController: UITableViewDelegate {
                ])
            pageVC.dataSource = self
            pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
-            pageVC.modalPresentationStyle = .fullScreen
            present(pageVC, animated: true, completion: nil)

-        case .showPageContentView:
-            pages = [DebugTableViewController(), DebugTableViewController(), DebugTableViewController()]
-            let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
-            pageVC.dataSource = self
-            pageVC.delegate = self
-            pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
-            self.addMainPanel(with: pageVC)
-        case .showPanelModal:
+        case .showFloatingPanelModal:
            let fpc = FloatingPanelController()
            let contentVC = self.storyboard!.instantiateViewController(withIdentifier: "DetailViewController")
-            contentVC.loadViewIfNeeded()
-            (contentVC as? DetailViewController)?.modeChangeView.isHidden = true
            fpc.set(contentViewController: contentVC)
            fpc.delegate = self

@@ -330,35 +295,23 @@ extension SampleListViewController: UITableViewDelegate {
            fpc.isRemovalInteractionEnabled = true

            self.present(fpc, animated: true, completion: nil)
-
+            
        case .showContentInset:
            let contentViewController = UIViewController()
            contentViewController.view.backgroundColor = .green
-
+            
            let fpc = FloatingPanelController()
            fpc.set(contentViewController: contentViewController)
-            fpc.surfaceView.contentInsets = .init(top: 20, left: 20, bottom: 20, right: 20)
-
-            fpc.delegate = self
-            fpc.isRemovalInteractionEnabled = true
-            self.present(fpc, animated: true, completion: nil)
-
-        case .showContainerMargins:
-            let fpc = FloatingPanelController()
-            fpc.surfaceView.cornerRadius = 38.5
-            fpc.surfaceView.backgroundColor = .red
-            fpc.surfaceView.containerMargins = .init(top: 24.0, left: 8.0, bottom: layoutInsets.bottom, right: 8.0)
-            #if swift(>=5.1) // Actually Xcode 11 or later
-            if #available(iOS 13.0, *) {
-                fpc.surfaceView.layer.cornerCurve = .continuous
-            }
-            #endif
-
+            fpc.surfaceView.contentInsets = .init(top: 20, left: 20, bottom: 0, right: 20)
+            
            fpc.delegate = self
            fpc.isRemovalInteractionEnabled = true
            self.present(fpc, animated: true, completion: nil)
        default:
-            self.addMainPanel(with: contentVC)
+            detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
+            mainPanelVC?.removePanelFromParent(animated: true) {
+                self.addMainPanel(with: contentVC)
+            }
        }
    }

@@ -378,15 +331,13 @@ extension SampleListViewController: FloatingPanelControllerDelegate {
            return newCollection.verticalSizeClass == .compact ? RemovablePanelLandscapeLayout() :  RemovablePanelLayout()
        case .showIntrinsicView:
            return IntrinsicPanelLayout()
-        case .showPanelModal:
+        case .showFloatingPanelModal:
            if vc != mainPanelVC && vc != detailPanelVC {
                return ModalPanelLayout()
            }
            fallthrough
-        case .showContentInset:
-            return NoInteractionBufferPanelLayout()
        default:
-            return (newCollection.verticalSizeClass == .compact) ? nil : self
+            return (newCollection.verticalSizeClass == .compact) ? nil  : self
        }
    }

@@ -448,40 +399,9 @@ extension SampleListViewController: UIPageViewControllerDataSource {
        return pages[index - 1]
    }
 }
-extension SampleListViewController: UIPageViewControllerDelegate {
-    // For showPageContent
-    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
-        if completed, let page = pageViewController.viewControllers?.first {
-            (pageViewController.parent as! FloatingPanelController).track(scrollView: (page as! DebugTableViewController).tableView)
-        }
-    }
-}

 class IntrinsicPanelLayout: FloatingPanelIntrinsicLayout { }

-class NoInteractionBufferPanelLayout: FloatingPanelLayout {
-    var initialPosition: FloatingPanelPosition {
-        return .full
-    }
-
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 0
-        case .half: return 216
-        case .tip: return 60
-        case .hidden: return nil
-        }
-    }
-
-    var topInteractionBuffer: CGFloat {
-        return 0.0
-    }
-
-    var bottomInteractionBuffer: CGFloat {
-        return 0.0
-    }
-}
-
 class RemovablePanelLayout: FloatingPanelIntrinsicLayout {
    var supportedPositions: Set<FloatingPanelPosition> {
        return [.full, .half]
@@ -753,10 +673,6 @@ class DebugTableViewController: InspectableViewController {
        //  Remove FloatingPanel from a view
        (self.parent as! FloatingPanelController).removePanelFromParent(animated: true, completion: nil)
    }
-
-    func scrollViewDidScroll(_ scrollView: UIScrollView) {
-        print("TableView --- ", scrollView.contentOffset, scrollView.contentInset)
-    }
 }

 extension DebugTableViewController: UITableViewDataSource {
@@ -799,8 +715,6 @@ extension DebugTableViewController: UITableViewDelegate {
 }

 class DetailViewController: InspectableViewController {
-    @IBOutlet weak var modeChangeView: UIStackView!
-    @IBOutlet weak var intrinsicHeightConstraint: NSLayoutConstraint!
    @IBOutlet weak var closeButton: UIButton!
    @IBAction func close(sender: UIButton) {
        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
@@ -817,10 +731,6 @@ class DetailViewController: InspectableViewController {
            break
        }
    }
-    @IBAction func modeChanged(_ sender: Any) {
-        guard let fpc = parent as? FloatingPanelController else { return }
-        fpc.contentMode = (fpc.contentMode == .static) ? .fitToBounds : .static
-    }

    @IBAction func tapped(_ sender: Any) {
        print("Detail panel is tapped!")
@@ -881,9 +791,7 @@ class ModalViewController: UIViewController, FloatingPanelControllerDelegate {
    @IBAction func moveToTip(sender: UIButton) {
        fpc.move(to: .tip, animated: true)
    }
-    @IBAction func moveToHidden(sender: UIButton) {
-        fpc.move(to: .hidden, animated: true)
-    }
+
    @IBAction func updateLayout(_ sender: Any) {
        isNewlayout = !isNewlayout
        UIView.animate(withDuration: 0.5) {
@@ -1021,7 +929,7 @@ extension TabBarContentViewController: UITextViewDelegate {
        // Using KVO of `scrollView.contentOffset`). Because it can lead to an
        // infinite loop if a user also resets a content offset as below and,
        // in the situation, a user has to modify the library.
-        if fpc.position != .full, fpc.surfaceView.frame.minY > fpc.originYOfSurface(for: .full) {
+        if fpc.position != .full, fpc.surfaceView.frame.minY < fpc.originYOfSurface(for: .full) {
            scrollView.contentOffset = .zero
        }
    }
@@ -1190,8 +1098,8 @@ class TwoTabBarPanelLayout: FloatingPanelLayout {
 }

 class TwoTabBarPanelBehavior: FloatingPanelBehavior {
-    func allowsRubberBanding(for edges: UIRectEdge) -> Bool {
-        return [UIRectEdge.top, UIRectEdge.bottom].contains(edges)
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
+        return (edge == .bottom || edge == .top)
    }
 }

@@ -7,13 +7,13 @@
 	objects = {

 /* Begin PBXBuildFile section */
+		5433F24B21717EA300BDAA5D /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 5433F24A21717EA300BDAA5D /* FloatingPanel.framework */; };
+		5433F24C21717EA300BDAA5D /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 5433F24A21717EA300BDAA5D /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		548DF95421705BE00041922A /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 548DF95321705BE00041922A /* AppDelegate.swift */; };
 		548DF95621705BE00041922A /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 548DF95521705BE00041922A /* ViewController.swift */; };
 		548DF95921705BE00041922A /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95721705BE00041922A /* Main.storyboard */; };
 		548DF95B21705BE10041922A /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95A21705BE10041922A /* Assets.xcassets */; };
 		548DF95E21705BE10041922A /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 548DF95C21705BE10041922A /* LaunchScreen.storyboard */; };
-		549D23CF233C77CF008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */; };
-		549D23D0233C77CF008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 /* End PBXBuildFile section */

 /* Begin PBXCopyFilesBuildPhase section */
@@ -23,7 +23,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				549D23D0233C77CF008EF4D7 /* FloatingPanel.framework in Embed Frameworks */,
+				5433F24C21717EA300BDAA5D /* FloatingPanel.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -31,6 +31,7 @@
 /* End PBXCopyFilesBuildPhase section */

 /* Begin PBXFileReference section */
+		5433F24A21717EA300BDAA5D /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		548DF95021705BE00041922A /* Stocks.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Stocks.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		548DF95321705BE00041922A /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		548DF95521705BE00041922A /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -38,7 +39,6 @@
 		548DF95A21705BE10041922A /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		548DF95D21705BE10041922A /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		548DF95F21705BE10041922A /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */

 /* Begin PBXFrameworksBuildPhase section */
@@ -46,7 +46,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				549D23CF233C77CF008EF4D7 /* FloatingPanel.framework in Frameworks */,
+				5433F24B21717EA300BDAA5D /* FloatingPanel.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -56,7 +56,7 @@
 		548DF94721705BE00041922A = {
 			isa = PBXGroup;
 			children = (
-				549D23CE233C77CF008EF4D7 /* FloatingPanel.framework */,
+				5433F24A21717EA300BDAA5D /* FloatingPanel.framework */,
 				548DF95221705BE00041922A /* Stocks */,
 				548DF95121705BE00041922A /* Products */,
 			);
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|

  s.name                = "FloatingPanel"
-  s.version             = "1.7.1"
+  s.version             = "1.5.1"
  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.
@@ -13,7 +13,7 @@ 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 => "v#{s.version}" }
  s.source_files        = "Framework/Sources/*.swift"
-  s.swift_versions      = ["4.0", "4.2", "5.0"]
+  s.swift_version       = "4.0"

  s.framework           = "UIKit"

@@ -7,7 +7,6 @@
 	objects = {

 /* Begin PBXBuildFile section */
-		542753C622C49A6E00D17955 /* FloatingPanelLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542753C522C49A6E00D17955 /* FloatingPanelLayoutTests.swift */; };
 		54352E9621A51A2500CBCA08 /* FloatingPanelTransitioning.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54352E9521A51A2500CBCA08 /* FloatingPanelTransitioning.swift */; };
 		54352E9821A521CA00CBCA08 /* FloatingPanelView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54352E9721A521CA00CBCA08 /* FloatingPanelView.swift */; };
 		5450EEE421646DF500135936 /* FloatingPanelBehavior.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5450EEE321646DF500135936 /* FloatingPanelBehavior.swift */; };
@@ -17,16 +16,14 @@
 		545DB9DE215118C800CA77B8 /* UIExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9DD215118C800CA77B8 /* UIExtensions.swift */; };
 		545DB9E021511AC100CA77B8 /* FloatingPanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9DF21511AC100CA77B8 /* FloatingPanelController.swift */; };
 		545DBA2B2152383100CA77B8 /* GrabberHandleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA2A2152383100CA77B8 /* GrabberHandleView.swift */; };
-		546055BF2333C4740069F400 /* Utils.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542753C722C49A8F00D17955 /* Utils.swift */; };
-		549E944522CF295D0050AECF /* FloatingPanelPositionTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 549E944422CF295D0050AECF /* FloatingPanelPositionTests.swift */; };
 		54A6B6B122968B530077F348 /* FloatingPanelTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B022968B530077F348 /* FloatingPanelTests.swift */; };
 		54A6B6B622968F710077F348 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 54A6B6B522968F710077F348 /* LaunchScreen.storyboard */; };
-		54A6B6B82296A8520077F348 /* FloatingPanelSurfaceViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B72296A8520077F348 /* FloatingPanelSurfaceViewTests.swift */; };
+		54A6B6B82296A8520077F348 /* FloatingPanelViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B72296A8520077F348 /* FloatingPanelViewTests.swift */; };
 		54ABD7AF216CCFF7002E6C13 /* Logger.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54ABD7AE216CCFF7002E6C13 /* Logger.swift */; };
 		54CDC5D3215B6D5A007D205C /* FloatingPanelSurfaceView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D2215B6D5A007D205C /* FloatingPanelSurfaceView.swift */; };
 		54CDC5D5215B6D8D007D205C /* FloatingPanelBackdropView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D4215B6D8D007D205C /* FloatingPanelBackdropView.swift */; };
 		54CFBFC3215CD045006B5735 /* FloatingPanelLayout.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC2215CD045006B5735 /* FloatingPanelLayout.swift */; };
-		54CFBFC5215CD09C006B5735 /* FloatingPanelCore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC4215CD09C006B5735 /* FloatingPanelCore.swift */; };
+		54CFBFC5215CD09C006B5735 /* FloatingPanel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC4215CD09C006B5735 /* FloatingPanel.swift */; };
 		54E740CD218AFD67005C1A34 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E740CC218AFD67005C1A34 /* AppDelegate.swift */; };
 /* End PBXBuildFile section */

@@ -48,8 +45,6 @@
 /* End PBXContainerItemProxy section */

 /* Begin PBXFileReference section */
-		542753C522C49A6E00D17955 /* FloatingPanelLayoutTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelLayoutTests.swift; sourceTree = "<group>"; };
-		542753C722C49A8F00D17955 /* Utils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Utils.swift; sourceTree = "<group>"; };
 		54352E9521A51A2500CBCA08 /* FloatingPanelTransitioning.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelTransitioning.swift; sourceTree = "<group>"; };
 		54352E9721A521CA00CBCA08 /* FloatingPanelView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelView.swift; sourceTree = "<group>"; };
 		5450EEE321646DF500135936 /* FloatingPanelBehavior.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelBehavior.swift; sourceTree = "<group>"; };
@@ -62,15 +57,14 @@
 		545DB9DD215118C800CA77B8 /* UIExtensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIExtensions.swift; sourceTree = "<group>"; };
 		545DB9DF21511AC100CA77B8 /* FloatingPanelController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelController.swift; sourceTree = "<group>"; };
 		545DBA2A2152383100CA77B8 /* GrabberHandleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GrabberHandleView.swift; sourceTree = "<group>"; };
-		549E944422CF295D0050AECF /* FloatingPanelPositionTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelPositionTests.swift; sourceTree = "<group>"; };
 		54A6B6B022968B530077F348 /* FloatingPanelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelTests.swift; sourceTree = "<group>"; };
 		54A6B6B522968F710077F348 /* LaunchScreen.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; path = LaunchScreen.storyboard; sourceTree = "<group>"; };
-		54A6B6B72296A8520077F348 /* FloatingPanelSurfaceViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelSurfaceViewTests.swift; sourceTree = "<group>"; };
+		54A6B6B72296A8520077F348 /* FloatingPanelViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelViewTests.swift; sourceTree = "<group>"; };
 		54ABD7AE216CCFF7002E6C13 /* Logger.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Logger.swift; sourceTree = "<group>"; };
 		54CDC5D2215B6D5A007D205C /* FloatingPanelSurfaceView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelSurfaceView.swift; sourceTree = "<group>"; };
 		54CDC5D4215B6D8D007D205C /* FloatingPanelBackdropView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelBackdropView.swift; sourceTree = "<group>"; };
 		54CFBFC2215CD045006B5735 /* FloatingPanelLayout.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelLayout.swift; sourceTree = "<group>"; };
-		54CFBFC4215CD09C006B5735 /* FloatingPanelCore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelCore.swift; sourceTree = "<group>"; };
+		54CFBFC4215CD09C006B5735 /* FloatingPanel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanel.swift; sourceTree = "<group>"; };
 		54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = FloatingPanelTesting.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		54E740CC218AFD67005C1A34 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		54E740D8218AFD6A005C1A34 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -129,7 +123,7 @@
 				545DB9C42151169500CA77B8 /* FloatingPanel.h */,
 				545DB9DF21511AC100CA77B8 /* FloatingPanelController.swift */,
 				54352E9521A51A2500CBCA08 /* FloatingPanelTransitioning.swift */,
-				54CFBFC4215CD09C006B5735 /* FloatingPanelCore.swift */,
+				54CFBFC4215CD09C006B5735 /* FloatingPanel.swift */,
 				54CFBFC2215CD045006B5735 /* FloatingPanelLayout.swift */,
 				5450EEE321646DF500135936 /* FloatingPanelBehavior.swift */,
 				54352E9721A521CA00CBCA08 /* FloatingPanelView.swift */,
@@ -146,11 +140,8 @@
 			isa = PBXGroup;
 			children = (
 				54A6B6B022968B530077F348 /* FloatingPanelTests.swift */,
+				54A6B6B72296A8520077F348 /* FloatingPanelViewTests.swift */,
 				545DB9CF2151169500CA77B8 /* FloatingPanelControllerTests.swift */,
-				542753C522C49A6E00D17955 /* FloatingPanelLayoutTests.swift */,
-				54A6B6B72296A8520077F348 /* FloatingPanelSurfaceViewTests.swift */,
-				549E944422CF295D0050AECF /* FloatingPanelPositionTests.swift */,
-				542753C722C49A8F00D17955 /* Utils.swift */,
 				545DB9D12151169500CA77B8 /* Info.plist */,
 			);
 			path = Tests;
@@ -311,7 +302,7 @@
 				54CFBFC3215CD045006B5735 /* FloatingPanelLayout.swift in Sources */,
 				54CDC5D5215B6D8D007D205C /* FloatingPanelBackdropView.swift in Sources */,
 				54352E9821A521CA00CBCA08 /* FloatingPanelView.swift in Sources */,
-				54CFBFC5215CD09C006B5735 /* FloatingPanelCore.swift in Sources */,
+				54CFBFC5215CD09C006B5735 /* FloatingPanel.swift in Sources */,
 				54ABD7AF216CCFF7002E6C13 /* Logger.swift in Sources */,
 				545DB9E021511AC100CA77B8 /* FloatingPanelController.swift in Sources */,
 				5450EEE421646DF500135936 /* FloatingPanelBehavior.swift in Sources */,
@@ -327,10 +318,7 @@
 			files = (
 				54A6B6B122968B530077F348 /* FloatingPanelTests.swift in Sources */,
 				545DB9D02151169500CA77B8 /* FloatingPanelControllerTests.swift in Sources */,
-				549E944522CF295D0050AECF /* FloatingPanelPositionTests.swift in Sources */,
-				542753C622C49A6E00D17955 /* FloatingPanelLayoutTests.swift in Sources */,
-				54A6B6B82296A8520077F348 /* FloatingPanelSurfaceViewTests.swift in Sources */,
-				546055BF2333C4740069F400 /* Utils.swift in Sources */,
+				54A6B6B82296A8520077F348 /* FloatingPanelViewTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -484,7 +472,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
-				BUILD_LIBRARY_FOR_DISTRIBUTION = YES;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
@@ -515,7 +502,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
-				BUILD_LIBRARY_FOR_DISTRIBUTION = YES;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
@@ -704,7 +690,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "TEST DEBUG __FP_LOG";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG __FP_LOG";
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 4.0;
@@ -29,9 +29,7 @@
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
         <TestableReference
-            skipped = "NO"
-            parallelizable = "YES"
-            testExecutionOrdering = "random">
+            skipped = "NO">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "545DB9C92151169500CA77B8"
@@ -8,9 +8,9 @@ import UIKit.UIGestureRecognizerSubclass // For Xcode 9.4.1
 ///
 /// FloatingPanel presentation model
 ///
-class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
+class FloatingPanel: NSObject, UIGestureRecognizerDelegate, UIScrollViewDelegate {
    // MUST be a weak reference to prevent UI freeze on the presentation modally
-    weak var viewcontroller: FloatingPanelController?
+    weak var viewcontroller: FloatingPanelController!

    let surfaceView: FloatingPanelSurfaceView
    let backdropView: FloatingPanelBackdropView
@@ -19,17 +19,13 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {

    weak var scrollView: UIScrollView? {
        didSet {
-            oldValue?.panGestureRecognizer.removeTarget(self, action: nil)
-            scrollView?.panGestureRecognizer.addTarget(self, action: #selector(handle(panGesture:)))
+            guard let scrollView = scrollView else { return }
+            scrollView.panGestureRecognizer.addTarget(self, action: #selector(handle(panGesture:)))
        }
    }

    private(set) var state: FloatingPanelPosition = .hidden {
-        didSet {
-            if let vc = viewcontroller {
-                vc.delegate?.floatingPanelDidChangePosition(vc)
-            }
-        }
+        didSet { viewcontroller.delegate?.floatingPanelDidChangePosition(viewcontroller) }
    }

    private var isBottomState: Bool {
@@ -40,7 +36,15 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    let panGestureRecognizer: FloatingPanelPanGestureRecognizer
    var isRemovalInteractionEnabled: Bool = false

-    fileprivate var animator: UIViewPropertyAnimator?
+    fileprivate var animator: UIViewPropertyAnimator? {
+        didSet {
+            // This intends to avoid `tableView(_:didSelectRowAt:)` not being
+            // called on first tap after the moving animation, but it doesn't
+            // seem to be enough. The same issue happens on Apple Maps so it
+            // might be an issue in `UITableView`.
+            scrollView?.isUserInteractionEnabled = (animator == nil)
+        }
+    }

    private var initialFrame: CGRect = .zero
    private var initialTranslationY: CGFloat = 0
@@ -51,20 +55,21 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {

    // Scroll handling
    private var initialScrollOffset: CGPoint = .zero
+    private var initialScrollFrame: CGRect = .zero
    private var stopScrollDeceleration: Bool = false
    private var scrollBouncable = false
    private var scrollIndictorVisible = false

+    private var isScrollLocked: Bool = false
+
    // MARK: - Interface

    init(_ vc: FloatingPanelController, layout: FloatingPanelLayout, behavior: FloatingPanelBehavior) {
        viewcontroller = vc

        surfaceView = FloatingPanelSurfaceView()
-        surfaceView.backgroundColor = .white

        backdropView = FloatingPanelBackdropView()
-        backdropView.backgroundColor = .black
        backdropView.alpha = 0.0

        self.layoutAdapter = FloatingPanelLayoutAdapter(surfaceView: surfaceView,
@@ -81,15 +86,10 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        super.init()

        panGestureRecognizer.floatingPanel = self
+
        surfaceView.addGestureRecognizer(panGestureRecognizer)
        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)
    }

    func move(to: FloatingPanelPosition, animated: Bool, completion: (() -> Void)? = nil) {
@@ -97,11 +97,6 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    }

    private func move(from: FloatingPanelPosition, to: FloatingPanelPosition, animated: Bool, completion: (() -> Void)? = nil) {
-        assert(layoutAdapter.isValid(to), "Can't move to '\(to)' position because it's not valid in the layout")
-        guard let vc = viewcontroller else {
-            completion?()
-            return
-        }
        if state != layoutAdapter.topMostState {
            lockScrollView()
        }
@@ -111,11 +106,11 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            let animator: UIViewPropertyAnimator
            switch (from, to) {
            case (.hidden, let to):
-                animator = behavior.addAnimator(vc, to: to)
+                animator = behavior.addAnimator(self.viewcontroller, to: to)
            case (let from, .hidden):
-                animator = behavior.removeAnimator(vc, from: from)
+                animator = behavior.removeAnimator(self.viewcontroller, from: from)
            case (let from, let to):
-                animator = behavior.moveAnimator(vc, from: from, to: to)
+                animator = behavior.moveAnimator(self.viewcontroller, from: from, to: to)
            }

            animator.addAnimations { [weak self] in
@@ -127,11 +122,7 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            animator.addCompletion { [weak self] _ in
                guard let `self` = self else { return }
                self.animator = nil
-                if self.state == self.layoutAdapter.topMostState {
-                    self.unlockScrollView()
-                } else {
-                    self.lockScrollView()
-                }
+                self.unlockScrollView()
                completion?()
            }
            self.animator = animator
@@ -139,11 +130,7 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        } else {
            self.state = to
            self.updateLayout(to: to)
-            if self.state == self.layoutAdapter.topMostState {
-                self.unlockScrollView()
-            } else {
-                self.lockScrollView()
-            }
+            self.unlockScrollView()
            completion?()
        }
    }
@@ -151,19 +138,14 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    // MARK: - Layout update

    private func updateLayout(to target: FloatingPanelPosition) {
-        self.layoutAdapter.activateFixedLayout()
-        self.layoutAdapter.activateInteractiveLayout(of: target)
+        self.layoutAdapter.activateLayout(of: target)
    }

-    func getBackdropAlpha(at currentY: CGFloat, with translation: CGPoint) -> CGFloat {
-        let forwardY = (translation.y >= 0)
-        let segment = layoutAdapter.segument(at: currentY, forward: forwardY)
-        let lowerPos = segment.lower ?? layoutAdapter.topMostState
-        let upperPos = segment.upper ?? layoutAdapter.bottomMostState
-
-        let pre = forwardY ? lowerPos : upperPos
-        let next = forwardY ? upperPos : lowerPos
+    private func getBackdropAlpha(with translation: CGPoint) -> CGFloat {
+        let currentY = surfaceView.frame.minY

+        let next = directionalPosition(at: currentY, with: translation)
+        let pre = redirectionalPosition(at: currentY, with: translation)
        let nextY = layoutAdapter.positionY(for: next)
        let preY = layoutAdapter.positionY(for: pre)

@@ -185,8 +167,7 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {

        /* log.debug("shouldRecognizeSimultaneouslyWith", otherGestureRecognizer) */

-        if let vc = viewcontroller,
-            vc.delegate?.floatingPanel(vc, shouldRecognizeSimultaneouslyWith: otherGestureRecognizer) ?? false {
+        if viewcontroller.delegate?.floatingPanel(viewcontroller, shouldRecognizeSimultaneouslyWith: otherGestureRecognizer) ?? false {
            return true
        }

@@ -202,10 +183,7 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        default:
            // Should recognize tap/long press gestures in parallel when the surface view is at an anchor position.
            let surfaceFrame = surfaceView.layer.presentation()?.frame ?? surfaceView.frame
-            let surfaceY = surfaceFrame.minY
-            let adapterY = layoutAdapter.positionY(for: state)
-
-            return abs(surfaceY - adapterY) < (1.0 / surfaceView.traitCollection.displayScale)
+            return surfaceFrame.minY == layoutAdapter.positionY(for: state)
        }
    }

@@ -232,21 +210,15 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            // the panel's pan gesture if not returns false
            if let scrollGestureRecognizers = scrollView.gestureRecognizers,
                scrollGestureRecognizers.contains(otherGestureRecognizer) {
-                switch otherGestureRecognizer {
-                case scrollView.panGestureRecognizer:
-                    let offset = scrollView.contentOffset.y - scrollView.contentOffsetZero.y
-                    return allowScrollPanGesture(at: CGPoint(x: 0.0, y: offset))
-                default:
-                    return false
-                }
+                return false
            }
        }

-        if let vc = viewcontroller,
-            vc.delegate?.floatingPanel(vc, shouldRecognizeSimultaneouslyWith: otherGestureRecognizer) ?? false {
+        if viewcontroller.delegate?.floatingPanel(viewcontroller, shouldRecognizeSimultaneouslyWith: otherGestureRecognizer) ?? false {
            return false
        }

+
        switch otherGestureRecognizer {
        case is UIPanGestureRecognizer,
             is UISwipeGestureRecognizer,
@@ -270,14 +242,6 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    }

    // MARK: - Gesture handling
-
-    @objc func handleBackdrop(tapGesture: UITapGestureRecognizer) {
-        viewcontroller?.dismiss(animated: true) { [weak self] in
-            guard let vc = self?.viewcontroller else { return }
-            vc.delegate?.floatingPanelDidEndRemove(vc)
-        }
-    }
-
    @objc func handle(panGesture: UIPanGestureRecognizer) {
        let velocity = panGesture.velocity(in: panGesture.view)

@@ -287,18 +251,14 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {

            let location = panGesture.location(in: surfaceView)

-            let surfaceMinY = surfaceView.presentationFrame.minY
-            let adapterTopY = layoutAdapter.topY
-            let belowTop = surfaceMinY > (adapterTopY + (1.0 / surfaceView.traitCollection.displayScale))
-            let offset = scrollView.contentOffset.y - scrollView.contentOffsetZero.y
+            let belowTop = surfaceView.frame.minY > layoutAdapter.topY

            log.debug("scroll gesture(\(state):\(panGesture.state)) --",
                "belowTop = \(belowTop),",
                "interactionInProgress = \(interactionInProgress),",
-                "scroll offset = \(offset),",
+                "scroll offset = \(scrollView.contentOffset.y),",
                "location = \(location.y), velocity = \(velocity.y)")

-
            if belowTop {
                // Scroll offset pinning
                if state == layoutAdapter.topMostState {
@@ -309,49 +269,33 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
                        if grabberAreaFrame.contains(location) {
                            // Preserve the current content offset in moving from full.
                            scrollView.setContentOffset(initialScrollOffset, animated: false)
+                        } else {
+                            let offset = scrollView.contentOffset.y - scrollView.contentOffsetZero.y
+                            if offset < 0 {
+                                fitToBounds(scrollView: scrollView)
+                                let translation = panGesture.translation(in: panGestureRecognizer.view!.superview)
+                                startInteraction(with: translation, at: location)
+                            }
                        }
                    }
                } else {
                    scrollView.setContentOffset(initialScrollOffset, animated: false)
                }

-                // Hide a scroll indicator at the non-top in dragging.
+                // Always hide a scroll indicator at the non-top.
                if interactionInProgress {
                    lockScrollView()
-                } else {
-                    if state == layoutAdapter.topMostState, self.animator == nil,
-                        offset > 0, velocity.y < 0 {
-                        unlockScrollView()
-                    }
                }
            } else {
+                // Always show a scroll indicator at the top.
                if interactionInProgress {
-                    // Show a scroll indicator at the top in dragging.
-                    if offset >= 0, velocity.y <= 0 {
-                        unlockScrollView()
-                    } else {
-                        if state == layoutAdapter.topMostState {
-                            // Adjust a small gap of the scroll offset just after swiping down starts in the grabber area.
-                            if grabberAreaFrame.contains(location), grabberAreaFrame.contains(initialLocation) {
-                                scrollView.setContentOffset(initialScrollOffset, animated: false)
-                            }
-                        }
-                    }
+                    unlockScrollView()
                } else {
-                    if state == layoutAdapter.topMostState {
-                        // Hide a scroll indicator just before starting an interaction by swiping a panel down.
-                        if velocity.y > 0, !allowScrollPanGesture(at: CGPoint(x: 0.0, y: offset)) {
-                            lockScrollView()
-                        }
-                        // Show a scroll indicator when an animation is interrupted at the top and content is scrolled up
-                        if velocity.y < 0, allowScrollPanGesture(at: CGPoint(x: 0.0, y: offset)) {
-                            unlockScrollView()
-                        }
-
-                        // Adjust a small gap of the scroll offset just before swiping down starts in the grabber area,
-                        if grabberAreaFrame.contains(location), grabberAreaFrame.contains(initialLocation) {
-                            scrollView.setContentOffset(initialScrollOffset, animated: false)
-                        }
+                    let offset = scrollView.contentOffset.y - scrollView.contentOffsetZero.y
+                    if state == layoutAdapter.topMostState, offset < 0, velocity.y > 0 {
+                        fitToBounds(scrollView: scrollView)
+                        let translation = panGesture.translation(in: panGestureRecognizer.view!.superview)
+                        startInteraction(with: translation, at: location)
                    }
                }
            }
@@ -362,26 +306,23 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            log.debug("panel gesture(\(state):\(panGesture.state)) --",
                "translation =  \(translation.y), location = \(location.y), velocity = \(velocity.y)")

-            if interactionInProgress == false, isDecelerating == false,
-                let vc = viewcontroller, vc.delegate?.floatingPanelShouldBeginDragging(vc) == false {
-                return
-            }
-
            if let animator = self.animator {
-                guard surfaceView.presentationFrame.minY >= layoutAdapter.topMaxY else { return }
-                log.debug("panel animation(interruptible: \(animator.isInterruptible)) interrupted!!!")
+                log.debug("panel animation 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
-                    // the a small gap between the presentation layer frame and model layer frame
-                    // to unlock scroll view properly at finishAnimation(at:)
-                    if abs(surfaceView.frame.minY - layoutAdapter.topY) <= 1.0 {
-                        surfaceView.frame.origin.y = layoutAdapter.topY
-                    }
                    animator.finishAnimation(at: .current)
-                } else {
-                    self.animator = nil
                }
+                self.animator = nil
+
+                // A user can stop a panel at the nearest Y of a target position
+                if abs(surfaceView.frame.minY - layoutAdapter.topY) < 1.0 {
+                    surfaceView.frame.origin.y = layoutAdapter.topY
+                }
+            }
+
+            if interactionInProgress == false,
+                viewcontroller.delegate?.floatingPanelShouldBeginDragging(viewcontroller) == false {
+                return
            }

            if panGesture.state == .began {
@@ -400,15 +341,6 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
                }
                panningChange(with: translation)
            case .ended, .cancelled, .failed:
-                if interactionInProgress == false {
-                    startInteraction(with: translation, at: location)
-                    // Workaround: Prevent stopping the surface view b/w anchors if the pan gesture
-                    // doesn't pass through .changed state after an interruptible animator is interrupted.
-                    let dy = translation.y - .leastNonzeroMagnitude
-                    layoutAdapter.updateInteractiveTopConstraint(diff: dy,
-                                                                 allowsTopBuffer: true,
-                                                                 with: behavior)
-                }
                panningEnd(with: translation, velocity: velocity)
            default:
                break
@@ -476,36 +408,33 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        // So here just preserve the current state if needed.
        log.debug("panningBegan -- location = \(location.y)")
        initialLocation = location
-
-        guard let scrollView = scrollView else { return }
        if state == layoutAdapter.topMostState {
-            if grabberAreaFrame.contains(location) {
-                initialScrollOffset = scrollView.contentOffset
+            if let scrollView = scrollView {
+                initialScrollFrame = scrollView.frame
            }
        } else {
-            initialScrollOffset = scrollView.contentOffset
+            if let scrollView = scrollView {
+                initialScrollOffset = scrollView.contentOffset
+            }
        }
    }

    private func panningChange(with translation: CGPoint) {
        log.debug("panningChange -- translation = \(translation.y)")
-        let preY = surfaceView.frame.minY
+        let pre = surfaceView.frame.minY
        let dy = translation.y - initialTranslationY

        layoutAdapter.updateInteractiveTopConstraint(diff: dy,
                                                     allowsTopBuffer: allowsTopBuffer(for: dy),
                                                     with: behavior)

-        let currentY = surfaceView.frame.minY
-        backdropView.alpha = getBackdropAlpha(at: currentY, with: translation)
+        backdropView.alpha = getBackdropAlpha(with: translation)
        preserveContentVCLayoutIfNeeded()

-        let didMove = (preY != currentY)
+        let didMove = (pre != surfaceView.frame.minY)
        guard didMove else { return }

-        if let vc = viewcontroller {
-            vc.delegate?.floatingPanelDidMove(vc)
-        }
+        viewcontroller.delegate?.floatingPanelDidMove(viewcontroller)
    }

    private func allowsTopBuffer(for translationY: CGFloat) -> Bool {
@@ -520,27 +449,20 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    }

    private var disabledBottomAutoLayout = false
-    private var disabledAutoLayoutItems: Set<NSLayoutConstraint> = []
    // Prevent stretching a view having a constraint to SafeArea.bottom in an overflow
    // from the full position because SafeArea is global in a screen.
    private func preserveContentVCLayoutIfNeeded() {
-        guard let vc = viewcontroller else { return }
-        guard vc.contentMode != .fitToBounds else { return }
-
        // Must include topY
        if (surfaceView.frame.minY <= layoutAdapter.topY) {
            if !disabledBottomAutoLayout {
-                disabledAutoLayoutItems.removeAll()
-                vc.contentViewController?.view?.constraints.forEach({ (const) in
-                    switch vc.contentViewController?.layoutGuide.bottomAnchor {
+                viewcontroller.contentViewController?.view?.constraints.forEach({ (const) in
+                    switch viewcontroller.contentViewController?.layoutGuide.bottomAnchor {
                    case const.firstAnchor:
                        (const.secondItem as? UIView)?.disableAutoLayout()
                        const.isActive = false
-                        disabledAutoLayoutItems.insert(const)
                    case const.secondAnchor:
                        (const.firstItem as? UIView)?.disableAutoLayout()
                        const.isActive = false
-                        disabledAutoLayoutItems.insert(const)
                    default:
                        break
                    }
@@ -549,8 +471,8 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            disabledBottomAutoLayout = true
        } else {
            if disabledBottomAutoLayout {
-                disabledAutoLayoutItems.forEach({ (const) in
-                    switch vc.contentViewController?.layoutGuide.bottomAnchor {
+                viewcontroller.contentViewController?.view?.constraints.forEach({ (const) in
+                    switch viewcontroller.contentViewController?.layoutGuide.bottomAnchor {
                    case const.firstAnchor:
                        (const.secondItem as? UIView)?.enableAutoLayout()
                        const.isActive = true
@@ -561,7 +483,6 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
                        break
                    }
                })
-                disabledAutoLayoutItems.removeAll()
            }
            disabledBottomAutoLayout = false
        }
@@ -575,7 +496,7 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            return
        }

-        stopScrollDeceleration = surfaceView.frame.minY > (layoutAdapter.topY + (1.0 / surfaceView.traitCollection.displayScale)) // Projecting the dragging to the scroll dragging or not
+        stopScrollDeceleration = (surfaceView.frame.minY > layoutAdapter.topY) // Projecting the dragging to the scroll dragging or not
        if stopScrollDeceleration {
            DispatchQueue.main.async { [weak self] in
                guard let `self` = self else { return }
@@ -583,37 +504,30 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
            }
        }

-        let currentY = surfaceView.frame.minY
-        let targetPosition = self.targetPosition(from: currentY, with: velocity)
+        let targetPosition = self.targetPosition(with: velocity)
        let distance = self.distance(to: targetPosition)

        endInteraction(for: targetPosition)

        if isRemovalInteractionEnabled, isBottomState {
-            let velocityVector = (distance != 0) ? CGVector(dx: 0, dy: min(velocity.y/distance, behavior.removalVelocity)) : .zero
-            // `velocityVector` will be replaced by just a velocity(not vector) when FloatingPanelRemovalInteraction will be added.
-            if shouldStartRemovalAnimation(with: velocityVector), let vc = viewcontroller {
-                vc.delegate?.floatingPanelDidEndDraggingToRemove(vc, withVelocity: velocity)
-                let animationVector = CGVector(dx: abs(velocityVector.dx), dy: abs(velocityVector.dy))
-                startRemovalAnimation(vc, with: animationVector) { [weak self] in
-                    self?.finishRemovalAnimation()
+            let velocityVector = (distance != 0) ? CGVector(dx: 0,
+                                                            dy: min(abs(velocity.y)/distance, behavior.removalVelocity)) : .zero
+
+            if shouldStartRemovalAnimation(with: velocityVector) {
+
+                viewcontroller.delegate?.floatingPanelDidEndDraggingToRemove(viewcontroller, withVelocity: velocity)
+                self.startRemovalAnimation(with: velocityVector) { [weak self] in
+                    guard let `self` = self else { return }
+                    self.viewcontroller.dismiss(animated: false, completion: { [weak self] in
+                        guard let `self` = self else { return }
+                        self.viewcontroller.delegate?.floatingPanelDidEndRemove(self.viewcontroller)
+                    })
                }
                return
            }
        }

-        if let vc = viewcontroller {
-            vc.delegate?.floatingPanelDidEndDragging(vc, withVelocity: velocity, targetPosition: targetPosition)
-        }
-
-        if scrollView != nil, !stopScrollDeceleration,
-            surfaceView.frame.minY == layoutAdapter.topY,
-            targetPosition == layoutAdapter.topMostState {
-            self.state = targetPosition
-            self.updateLayout(to: targetPosition)
-            self.unlockScrollView()
-            return
-        }
+        viewcontroller.delegate?.floatingPanelDidEndDragging(viewcontroller, withVelocity: velocity, targetPosition: targetPosition)

        // Workaround: Disable a tracking scroll to prevent bouncing a scroll content in a panel animating
        let isScrollEnabled = scrollView?.isScrollEnabled
@@ -633,12 +547,12 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    private func shouldStartRemovalAnimation(with velocityVector: CGVector) -> Bool {
        let posY = layoutAdapter.positionY(for: state)
        let currentY = surfaceView.frame.minY
-        let hiddenY = layoutAdapter.positionY(for: .hidden)
+        let bottomMaxY = layoutAdapter.bottomMaxY
        let vth = behavior.removalVelocity
        let pth = max(min(behavior.removalProgress, 1.0), 0.0)

        let num = (currentY - posY)
-        let den = (hiddenY - posY)
+        let den = (bottomMaxY - posY)

        guard num >= 0, den != 0, (num / den >= pth || velocityVector.dy == vth)
        else { return false }
@@ -646,11 +560,10 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        return true
    }

-    private func startRemovalAnimation(_ vc: FloatingPanelController, with velocityVector: CGVector, completion: (() -> Void)?) {
-        let animator = behavior.removalInteractionAnimator(vc, with: velocityVector)
+    private func startRemovalAnimation(with velocityVector: CGVector, completion: (() -> Void)?) {
+        let animator = self.behavior.removalInteractionAnimator(self.viewcontroller, with: velocityVector)

        animator.addAnimations { [weak self] in
-            self?.state = .hidden
            self?.updateLayout(to: .hidden)
        }
        animator.addCompletion({ _ in
@@ -661,27 +574,17 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        animator.startAnimation()
    }

-    private func finishRemovalAnimation() {
-        viewcontroller?.dismiss(animated: false) { [weak self] in
-            guard let vc = self?.viewcontroller else { return }
-            vc.delegate?.floatingPanelDidEndRemove(vc)
-        }
-    }
-
    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 = \(translation.y), location = \(location.y)")
        guard interactionInProgress == false else { return }

-        var offset: CGPoint = .zero
-
        initialFrame = surfaceView.frame
        if state == layoutAdapter.topMostState, let scrollView = scrollView {
            if grabberAreaFrame.contains(location) {
                initialScrollOffset = scrollView.contentOffset
            } else {
-                // Fit the surface bounds to a scroll offset content by startInteraction(at:offset:)
-                offset = CGPoint(x: -scrollView.contentOffset.x, y: -scrollView.contentOffset.y)
+                settle(scrollView: scrollView)
                initialScrollOffset = scrollView.contentOffsetZero
            }
            log.debug("initial scroll offset --", initialScrollOffset)
@@ -689,15 +592,11 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {

        initialTranslationY = translation.y

-        if let vc = viewcontroller {
-            vc.delegate?.floatingPanelWillBeginDragging(vc)
-        }
+        viewcontroller.delegate?.floatingPanelWillBeginDragging(viewcontroller)

-        layoutAdapter.startInteraction(at: state, offset: offset)
+        layoutAdapter.startInteraction(at: state)

        interactionInProgress = true
-
-        lockScrollView()
    }

    private func endInteraction(for targetPosition: FloatingPanelPosition) {
@@ -710,7 +609,7 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        interactionInProgress = false

        // Prevent to keep a scroll view indicator visible at the half/tip position
-        if targetPosition != layoutAdapter.topMostState {
+        if state != layoutAdapter.topMostState {
            lockScrollView()
        }

@@ -725,36 +624,19 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {

    private func startAnimation(to targetPosition: FloatingPanelPosition, at distance: CGFloat, with velocity: CGPoint) {
        log.debug("startAnimation to \(targetPosition) -- distance = \(distance), velocity = \(velocity.y)")
-        guard let vc = viewcontroller else { return }

        isDecelerating = true
+        viewcontroller.delegate?.floatingPanelWillBeginDecelerating(viewcontroller)

-        vc.delegate?.floatingPanelWillBeginDecelerating(vc)
-
-        let velocityVector = (distance != 0) ? CGVector(dx: 0, dy: abs(velocity.y)/distance) : .zero
-        let animator = behavior.interactionAnimator(vc, to: targetPosition, with: velocityVector)
+        let velocityVector = (distance != 0) ? CGVector(dx: 0, dy: min(abs(velocity.y)/distance, 30.0)) : .zero
+        let animator = behavior.interactionAnimator(self.viewcontroller, to: targetPosition, with: velocityVector)
        animator.addAnimations { [weak self] in
-            guard let `self` = self, let vc = self.viewcontroller else { return }
+            guard let `self` = self else { return }
            self.state = targetPosition
-            if animator.isInterruptible {
-                switch vc.contentMode {
-                case .fitToBounds:
-                    UIView.performWithLinear(startTime: 0.0, relativeDuration: 0.75) {
-                        self.layoutAdapter.activateFixedLayout()
-                        self.surfaceView.superview!.layoutIfNeeded()
-                    }
-                case .static:
-                    self.layoutAdapter.activateFixedLayout()
-                }
-            } else {
-                self.layoutAdapter.activateFixedLayout()
-            }
-            self.layoutAdapter.activateInteractiveLayout(of: targetPosition)
+            self.updateLayout(to: targetPosition)
        }
        animator.addCompletion { [weak self] pos in
-            // Prevent calling `finishAnimation(at:)` by the old animator whose `isInterruptive` is false
-            // when a new animator has been started after the old one is interrupted.
-            guard let `self` = self, self.animator == animator else { return }
+            guard let `self` = self else { return }
            self.finishAnimation(at: targetPosition)
        }
        self.animator = animator
@@ -767,26 +649,66 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        self.isDecelerating = false
        self.animator = nil

-        if let vc = viewcontroller {
-            vc.delegate?.floatingPanelDidEndDecelerating(vc)
-        }
+        self.viewcontroller.delegate?.floatingPanelDidEndDecelerating(self.viewcontroller)

        if let scrollView = scrollView {
            log.debug("finishAnimation -- scroll offset = \(scrollView.contentOffset)")
        }

        stopScrollDeceleration = false
-
-        log.debug("finishAnimation -- state = \(state) surface.minY = \(surfaceView.presentationFrame.minY) topY = \(layoutAdapter.topY)")
-        if state == layoutAdapter.topMostState, abs(surfaceView.presentationFrame.minY - layoutAdapter.topY) <= 1.0 {
+        // Don't unlock scroll view in animating view when presentation layer != model layer
+        if state == layoutAdapter.topMostState {
            unlockScrollView()
        }
    }

    private func distance(to targetPosition: FloatingPanelPosition) -> CGFloat {
+        let topY = layoutAdapter.topY
+        let middleY = layoutAdapter.middleY
+        let bottomY = layoutAdapter.bottomY
        let currentY = surfaceView.frame.minY
-        let targetY = layoutAdapter.positionY(for: targetPosition)
-        return CGFloat(abs(currentY - targetY))
+
+        switch targetPosition {
+        case .full:
+            return CGFloat(abs(currentY - topY))
+        case .half:
+            return CGFloat(abs(currentY - middleY))
+        case .tip:
+            return CGFloat(abs(currentY - bottomY))
+        case .hidden:
+            fatalError("Now .hidden must not be used for a user interaction")
+        }
+    }
+
+    private func directionalPosition(at currentY: CGFloat, with translation: CGPoint) -> FloatingPanelPosition {
+        return getPosition(at: currentY, with: translation, directional: true)
+    }
+
+    private func redirectionalPosition(at currentY: CGFloat, with translation: CGPoint) -> FloatingPanelPosition {
+        return getPosition(at: currentY, with: translation, directional: false)
+    }
+
+    private func getPosition(at currentY: CGFloat, with translation: CGPoint, directional: Bool) -> FloatingPanelPosition {
+        let supportedPositions: Set = layoutAdapter.supportedPositions
+        if supportedPositions.count == 1 {
+            return state
+        }
+        let isForwardYAxis = (translation.y >= 0)
+        switch supportedPositions {
+        case [.full, .half]:
+            return (isForwardYAxis == directional) ? .half : .full
+        case [.half, .tip]:
+            return (isForwardYAxis == directional) ? .tip : .half
+        case [.full, .tip]:
+            return (isForwardYAxis == directional) ? .tip : .full
+        default:
+            let middleY = layoutAdapter.middleY
+            if currentY > middleY {
+                return (isForwardYAxis == directional) ? .tip : .half
+            } else {
+                return (isForwardYAxis == directional) ? .half : .full
+            }
+        }
    }

    // Distance travelled after decelerating to zero velocity at a constant rate.
@@ -795,57 +717,148 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
        return (initialVelocity / 1000.0) * decelerationRate / (1.0 - decelerationRate)
    }

-    func targetPosition(from currentY: CGFloat, with velocity: CGPoint) -> (FloatingPanelPosition) {
-        guard let vc = viewcontroller else { return state }
+    private func targetPosition(with velocity: CGPoint) -> (FloatingPanelPosition) {
+        let currentY = surfaceView.frame.minY
        let supportedPositions = layoutAdapter.supportedPositions

-        guard supportedPositions.count > 1 else {
+        if supportedPositions.count == 1 {
            return state
        }

-        let sortedPositions = Array(supportedPositions).sorted(by: { $0.rawValue < $1.rawValue })
+        switch supportedPositions {
+        case [.full, .half]:
+            return targetPosition(from: [.full, .half], at: currentY, velocity: velocity)
+        case [.half, .tip]:
+            return targetPosition(from: [.half, .tip], at: currentY, velocity: velocity)
+        case [.full, .tip]:
+            return targetPosition(from: [.full, .tip], at: currentY, velocity: velocity)
+        default:
+            /*
+             [topY|full]---[th1]---[middleY|half]---[th2]---[bottomY|tip]
+             */
+            let topY = layoutAdapter.topY
+            let middleY = layoutAdapter.middleY
+            let bottomY = layoutAdapter.bottomY

-        // Projection
-        let decelerationRate = behavior.momentumProjectionRate(vc)
-        let baseY = abs(layoutAdapter.positionY(for: layoutAdapter.bottomMostState) - layoutAdapter.positionY(for: layoutAdapter.topMostState))
-        let vecY = velocity.y / baseY
-        var pY = project(initialVelocity: vecY, decelerationRate: decelerationRate) * baseY + currentY
+            let nextState: FloatingPanelPosition
+            let forwardYDirection: Bool

-        let forwardY = velocity.y == 0 ? (currentY - layoutAdapter.positionY(for: state) > 0) : velocity.y > 0
+            /*
+             full <-> half <-> tip
+             */
+            switch state {
+            case .full:
+                nextState = .half
+                forwardYDirection = true
+            case .half:
+                nextState = (currentY > middleY) ? .tip : .full
+                forwardYDirection = (currentY > middleY)
+            case .tip:
+                nextState = .half
+                forwardYDirection = false
+            case .hidden:
+                fatalError("Now .hidden must not be used for a user interaction")
+            }

-        let segment = layoutAdapter.segument(at: pY, forward: forwardY)
+            let redirectionalProgress = max(min(behavior.redirectionalProgress(viewcontroller, from: state, to: nextState), 1.0), 0.0)

-        var fromPos: FloatingPanelPosition
-        var toPos: FloatingPanelPosition
+            let th1: CGFloat
+            let th2: CGFloat

-        let (lowerPos, upperPos) = (segment.lower ?? sortedPositions.first!, segment.upper ?? sortedPositions.last!)
-        (fromPos, toPos) = forwardY ? (lowerPos, upperPos) : (upperPos, lowerPos)
+            if forwardYDirection {
+                th1 = topY + (middleY - topY) * redirectionalProgress
+                th2 = middleY + (bottomY - middleY) * redirectionalProgress
+            } else {
+                th1 = middleY - (middleY - topY) * redirectionalProgress
+                th2 = bottomY - (bottomY - middleY) * redirectionalProgress
+            }

-        if behavior.shouldProjectMomentum(vc, for: toPos) == false {
-            let segment = layoutAdapter.segument(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
-            if lowerPos == upperPos {
-                if forwardY {
-                    upperPos = lowerPos.next(in: sortedPositions)
-                } else {
-                    lowerPos = upperPos.pre(in: sortedPositions)
+            let decelerationRate = behavior.momentumProjectionRate(viewcontroller)
+
+            let baseY = abs(bottomY - topY)
+            let vecY = velocity.y / baseY
+            let pY = project(initialVelocity: vecY, decelerationRate: decelerationRate) * baseY + currentY
+
+            switch currentY {
+            case ..<th1:
+                switch pY {
+                case bottomY...:
+                    return behavior.shouldProjectMomentum(viewcontroller, for: .tip) ? .tip : .half
+                case middleY...:
+                    return .half
+                case topY...:
+                    return .full
+                default:
+                    return .full
+                }
+            case ...middleY:
+                switch pY {
+                case bottomY...:
+                    return behavior.shouldProjectMomentum(viewcontroller, for: .tip) ? .tip : .half
+                case middleY...:
+                    return .half
+                case topY...:
+                    return .half
+                default:
+                    return .full
+                }
+            case ..<th2:
+                switch pY {
+                case bottomY...:
+                    return .tip
+                case middleY...:
+                    return .half
+                case topY...:
+                    return .half
+                default:
+                    return behavior.shouldProjectMomentum(viewcontroller, for: .full) ? .full : .half
+                }
+            default:
+                switch pY {
+                case bottomY...:
+                    return .tip
+                case middleY...:
+                    return .tip
+                case topY...:
+                    return .half
+                default:
+                    return behavior.shouldProjectMomentum(viewcontroller, for: .full) ? .full : .half
                }
            }
-            (fromPos, toPos) = forwardY ? (lowerPos, upperPos) : (upperPos, lowerPos)
-            // Block a projection to a segment over the next from the current segment
-            // (= Trim pY with the current segment)
-            if forwardY {
-                pY = max(min(pY, layoutAdapter.positionY(for: toPos.next(in: sortedPositions))), layoutAdapter.positionY(for: fromPos))
+        }
+    }
+
+    private func targetPosition(from positions: [FloatingPanelPosition], at currentY: CGFloat, velocity: CGPoint) -> FloatingPanelPosition {
+        assert(positions.count == 2)
+
+        let top = positions[0]
+        let bottom = positions[1]
+
+        let topY = layoutAdapter.positionY(for: top)
+        let bottomY = layoutAdapter.positionY(for: bottom)
+
+        let target = top == state ? bottom : top
+        let redirectionalProgress = max(min(behavior.redirectionalProgress(viewcontroller, from: state, to: target), 1.0), 0.0)
+
+        let th = topY + (bottomY - topY) * redirectionalProgress
+
+        let decelerationRate = behavior.momentumProjectionRate(viewcontroller)
+        let pY = project(initialVelocity: velocity.y, decelerationRate: decelerationRate) + currentY
+
+        switch currentY {
+        case ..<th:
+            if pY >= bottomY {
+                return bottom
            } else {
-                pY = max(min(pY, layoutAdapter.positionY(for: fromPos)), layoutAdapter.positionY(for: toPos.pre(in: sortedPositions)))
+                return top
+            }
+        default:
+            if pY <= topY {
+                return top
+            } else {
+                return bottom
            }
        }
-
-        // Redirection
-        let redirectionalProgress = max(min(behavior.redirectionalProgress(vc, from: fromPos, to: toPos), 1.0), 0.0)
-        let progress = abs(pY - layoutAdapter.positionY(for: fromPos)) / abs(layoutAdapter.positionY(for: fromPos) - layoutAdapter.positionY(for: toPos))
-        return progress > redirectionalProgress ? toPos : fromPos
    }

    // MARK: - ScrollView handling
@@ -853,11 +866,11 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    private func lockScrollView() {
        guard let scrollView = scrollView else { return }

-        if scrollView.isLocked {
+        if isScrollLocked {
            log.debug("Already scroll locked.")
            return
        }
-        log.debug("lock scroll view")
+        isScrollLocked = true

        scrollBouncable = scrollView.bounces
        scrollIndictorVisible = scrollView.showsVerticalScrollIndicator
@@ -868,29 +881,47 @@ class FloatingPanelCore: NSObject, UIGestureRecognizerDelegate {
    }

    private func unlockScrollView() {
-        guard let scrollView = scrollView, scrollView.isLocked else { return }
-        log.debug("unlock scroll view")
+        guard let scrollView = scrollView, isScrollLocked else { return }
+
+        isScrollLocked = false

        scrollView.isDirectionalLockEnabled = false
        scrollView.bounces = scrollBouncable
        scrollView.showsVerticalScrollIndicator = scrollIndictorVisible
    }

+    private func fitToBounds(scrollView: UIScrollView) {
+        log.debug("fit scroll view to bounds -- scroll offset =", scrollView.contentOffset.y)
+
+        surfaceView.frame.origin.y = layoutAdapter.topY - scrollView.contentOffset.y
+        scrollView.transform = CGAffineTransform.identity.translatedBy(x: 0.0,
+                                                                       y: scrollView.contentOffset.y)
+        scrollView.scrollIndicatorInsets = UIEdgeInsets(top: -scrollView.contentOffset.y,
+                                                        left: 0.0,
+                                                        bottom: 0.0,
+                                                        right: 0.0)
+    }
+
+    private func settle(scrollView: UIScrollView) {
+        log.debug("settle scroll view")
+        let frame = surfaceView.layer.presentation()?.frame ?? surfaceView.frame
+        surfaceView.transform = .identity
+        surfaceView.frame = frame
+        scrollView.transform = .identity
+        scrollView.frame = initialScrollFrame
+        scrollView.contentOffset = scrollView.contentOffsetZero
+        scrollView.scrollIndicatorInsets = .zero
+    }
+
+
    private func stopScrollingWithDeceleration(at contentOffset: CGPoint) {
        // Must use setContentOffset(_:animated) to force-stop deceleration
        scrollView?.setContentOffset(contentOffset, animated: false)
    }
-
-    private func allowScrollPanGesture(at contentOffset: CGPoint) -> Bool {
-        if state == layoutAdapter.topMostState {
-            return contentOffset.y <= -30.0 || contentOffset.y > 0
-        }
-        return false
-    }
 }

 class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
-    fileprivate weak var floatingPanel: FloatingPanelCore?
+    fileprivate weak var floatingPanel: FloatingPanel?
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesBegan(touches, with: event)
        if floatingPanel?.animator != nil {
@@ -902,7 +933,7 @@ class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
            return super.delegate
        }
        set {
-            guard newValue is FloatingPanelCore else {
+            guard newValue is FloatingPanel else {
                let exception = NSException(name: .invalidArgumentException,
                                            reason: "FloatingPanelController's built-in pan gesture recognizer must have its controller as its delegate.",
                                            userInfo: nil)
@@ -7,5 +7,25 @@ import UIKit

 /// A view that presents a backdrop interface behind a floating panel.
 public class FloatingPanelBackdropView: UIView {
-    public var dismissalTapGestureRecognizer: UITapGestureRecognizer!
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        setUp()
+    }
+
+    required public init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        setUp()
+    }
+
+    private func setUp() {
+        layer.backgroundColor = UIColor.black.cgColor
+    }
+
+    @objc dynamic public override var backgroundColor: UIColor? {
+        get {
+            guard let color = layer.backgroundColor else { return nil }
+            return UIColor(cgColor: color)
+        }
+        set { layer.backgroundColor = newValue?.cgColor }
+    }
 }
@@ -23,11 +23,6 @@ public protocol FloatingPanelBehavior {
    func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> CGFloat

    /// Returns a UIViewPropertyAnimator object to project a floating panel to a position on finger up if the user dragged.
-    ///
-    /// - Attention:
-    /// By default, it returns a non-interruptible animator to prevent a propagation of the animation to a content view.
-    /// However returning an interruptible animator is working well depending on a content view and it can be better
-    /// than using a non-interruptible one.
    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator

    /// Returns a UIViewPropertyAnimator object to add a floating panel to a position.
@@ -72,7 +67,14 @@ public protocol FloatingPanelBehavior {

 public extension FloatingPanelBehavior {
    func shouldProjectMomentum(_ fpc: FloatingPanelController, for proposedTargetPosition: FloatingPanelPosition) -> Bool {
-        return false
+        switch (fpc.position, proposedTargetPosition) {
+        case (.full, .tip):
+            return false
+        case (.tip,  .full):
+            return false
+        default:
+            return true
+        }
    }

    func momentumProjectionRate(_ fpc: FloatingPanelController) -> CGFloat {
@@ -132,7 +134,7 @@ public class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
    public func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
        let timing = timeingCurve(with: velocity)
        let animator = UIViewPropertyAnimator(duration: 0, timingParameters: timing)
-        animator.isInterruptible = false // Prevent a propagation of the animation(spring etc) to a content view
+        animator.isInterruptible = false
        return animator
    }

@@ -12,9 +12,7 @@ public protocol FloatingPanelControllerDelegate: class {
    // if it returns nil, FloatingPanelController uses the default behavior
    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior?

-    /// Called when the floating panel has changed to a new position. Can be called inside an animation block, so any
-    /// view properties set inside this function will be automatically animated alongside the panel.
-    func floatingPanelDidChangePosition(_ vc: FloatingPanelController)
+    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) // changed the settled position in the model layer

    /// Asks the delegate if dragging should begin by the pan gesture recognizer.
    func floatingPanelShouldBeginDragging(_ vc: FloatingPanelController) -> Bool
@@ -70,60 +68,18 @@ public enum FloatingPanelPosition: Int {
    case half
    case tip
    case hidden
-
-    static var allCases: [FloatingPanelPosition] {
-        return [.full, .half, .tip, .hidden]
-    }
-
-    func next(in positions: [FloatingPanelPosition]) -> FloatingPanelPosition {
-        #if swift(>=4.2)
-        guard
-            let index = positions.firstIndex(of: self),
-            positions.indices.contains(index + 1)
-            else { return self }
-        #else
-        guard
-            let index = positions.index(of: self),
-            positions.indices.contains(index + 1)
-            else { return self }
-        #endif
-        return positions[index + 1]
-    }
-
-    func pre(in positions: [FloatingPanelPosition]) -> FloatingPanelPosition {
-        #if swift(>=4.2)
-        guard
-            let index = positions.firstIndex(of: self),
-            positions.indices.contains(index - 1)
-            else { return self }
-        #else
-        guard
-            let index = positions.index(of: self),
-            positions.indices.contains(index - 1)
-            else { return self }
-        #endif
-        return positions[index - 1]
-    }
 }

 ///
 /// A container view controller to display a floating panel to present contents in parallel as a user wants.
 ///
-open class FloatingPanelController: UIViewController {
+open class FloatingPanelController: UIViewController, UIScrollViewDelegate, UIGestureRecognizerDelegate {
    /// Constants indicating how safe area insets are added to the adjusted content inset.
    public enum ContentInsetAdjustmentBehavior: Int {
        case always
        case never
    }

-    /// A flag used to determine how the controller object lays out the content view when the surface position changes.
-    public enum ContentMode: Int {
-        /// The option to fix the content to keep the height of the top most position.
-        case `static`
-        /// The option to scale the content to fit the bounds of the root view by changing the surface position.
-        case fitToBounds
-    }
-
    /// The delegate of the floating panel controller object.
    public weak var delegate: FloatingPanelControllerDelegate?{
        didSet{
@@ -187,17 +143,9 @@ open class FloatingPanelController: UIViewController {
        set { set(contentViewController: newValue) }
        get { return _contentViewController }
    }
-
-    public var contentMode: ContentMode = .static {
-        didSet {
-            guard position != .hidden else { return }
-            activateLayout()
-        }
-    }
-
    private var _contentViewController: UIViewController?

-    private(set) var floatingPanel: FloatingPanelCore!
+    private var floatingPanel: FloatingPanel!
    private var preSafeAreaInsets: UIEdgeInsets = .zero // Capture the latest one
    private var safeAreaInsetsObservation: NSKeyValueObservation?
    private let modalTransition = FloatingPanelModalTransition()
@@ -220,7 +168,7 @@ open class FloatingPanelController: UIViewController {
        modalPresentationStyle = .custom
        transitioningDelegate = modalTransition

-        floatingPanel = FloatingPanelCore(self,
+        floatingPanel = FloatingPanel(self,
                                      layout: fetchLayout(for: self.traitCollection),
                                      behavior: fetchBehavior(for: self.traitCollection))
    }
@@ -229,7 +177,7 @@ open class FloatingPanelController: UIViewController {
        floatingPanel.layoutAdapter.layout = fetchLayout(for: traitCollection)
        floatingPanel.behavior = fetchBehavior(for: self.traitCollection)
    }
-
+    
    // MARK:- Overrides

    /// Creates the view that the controller manages.
@@ -248,19 +196,18 @@ open class FloatingPanelController: UIViewController {
        self.view = view as UIView
    }

-    open override func viewDidLayoutSubviews() {
+    open  override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        if #available(iOS 11.0, *) {}
        else {
            // Because {top,bottom}LayoutGuide is managed as a view
-            if preSafeAreaInsets != layoutInsets,
-                floatingPanel.isDecelerating == false {
+            if preSafeAreaInsets != layoutInsets {
                self.update(safeAreaInsets: layoutInsets)
            }
        }
    }

-    open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
+    open  override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size, with: coordinator)

        if view.translatesAutoresizingMaskIntoConstraints {
@@ -269,9 +216,14 @@ open class FloatingPanelController: UIViewController {
        }
    }

-    open override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+    open  override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
        super.willTransition(to: newCollection, with: coordinator)
-        self.prepare(for: newCollection)
+
+        // Change layout for a new trait collection
+        reloadLayout(for: newCollection)
+        setUpLayout()
+
+        floatingPanel.behavior = fetchBehavior(for: newCollection)
    }

    open override func viewWillDisappear(_ animated: Bool) {
@@ -279,15 +231,6 @@ open class FloatingPanelController: UIViewController {
        safeAreaInsetsObservation = nil
    }

-    // MARK:- Internals
-    func prepare(for newCollection: UITraitCollection) {
-        guard newCollection.shouldUpdateLayout(from: traitCollection) else { return }
-        // Change a layout & behavior for a new trait collection
-        reloadLayout(for: newCollection)
-        activateLayout()
-        floatingPanel.behavior = fetchBehavior(for: newCollection)
-    }
-
    // MARK:- Privates

    private func fetchLayout(for traitCollection: UITraitCollection) -> FloatingPanelLayout {
@@ -305,7 +248,8 @@ open class FloatingPanelController: UIViewController {

    private func update(safeAreaInsets: UIEdgeInsets) {
        guard
-            preSafeAreaInsets != safeAreaInsets
+            preSafeAreaInsets != safeAreaInsets,
+            self.floatingPanel.isDecelerating == false
            else { return }

        log.debug("Update safeAreaInsets", safeAreaInsets)
@@ -313,7 +257,7 @@ open class FloatingPanelController: UIViewController {
        // Prevent an infinite loop on iOS 10: setUpLayout() -> viewDidLayoutSubviews() -> setUpLayout()
        preSafeAreaInsets = safeAreaInsets

-        activateLayout()
+        setUpLayout()

        switch contentInsetAdjustmentBehavior {
        case .always:
@@ -326,6 +270,7 @@ open class FloatingPanelController: UIViewController {

    private func reloadLayout(for traitCollection: UITraitCollection) {
        floatingPanel.layoutAdapter.layout = fetchLayout(for: traitCollection)
+        floatingPanel.layoutAdapter.prepareLayout(in: self)

        if let parent = self.parent {
            if let layout = layout as? UIViewController, layout == parent {
@@ -337,9 +282,7 @@ open class FloatingPanelController: UIViewController {
        }
    }

-    private func activateLayout() {
-        floatingPanel.layoutAdapter.prepareLayout(in: self)
-
+    private func setUpLayout() {
        // preserve the current content offset
        let contentOffset = scrollView?.contentOffset

@@ -355,7 +298,7 @@ open class FloatingPanelController: UIViewController {
    public func show(animated: Bool = false, completion: (() -> Void)? = nil) {
        // Must apply the current layout here
        reloadLayout(for: traitCollection)
-        activateLayout()
+        setUpLayout()

        if #available(iOS 11.0, *) {
            // Must track the safeAreaInsets of `self.view` to update the layout.
@@ -380,6 +323,7 @@ open class FloatingPanelController: UIViewController {

    /// Hides the surface view to the hidden position
    public func hide(animated: Bool = false, completion: (() -> Void)? = nil) {
+        safeAreaInsetsObservation = nil
        move(to: .hidden,
             animated: animated,
             completion: completion)
@@ -425,9 +369,9 @@ open class FloatingPanelController: UIViewController {
        show(animated: animated) { [weak self] in
            guard let `self` = self else { return }
            #if swift(>=4.2)
-            self.didMove(toParent: parent)
+            self.didMove(toParent: self)
            #else
-            self.didMove(toParentViewController: parent)
+            self.didMove(toParentViewController: self)
            #endif
        }
    }
@@ -569,12 +513,21 @@ open class FloatingPanelController: UIViewController {
    /// animation block.
    public func updateLayout() {
        reloadLayout(for: traitCollection)
-        activateLayout()
+        setUpLayout()
    }

    /// Returns the y-coordinate of the point at the origin of the surface view.
    public func originYOfSurface(for pos: FloatingPanelPosition) -> CGFloat {
-        return floatingPanel.layoutAdapter.positionY(for: pos)
+        switch pos {
+        case .full:
+            return floatingPanel.layoutAdapter.topY
+        case .half:
+            return floatingPanel.layoutAdapter.middleY
+        case .tip:
+            return floatingPanel.layoutAdapter.bottomY
+        case .hidden:
+            return floatingPanel.layoutAdapter.hiddenY
+        }
    }
 }

@@ -11,24 +11,15 @@ import UIKit
 /// It can't be used with FloatingPanelIntrinsicLayout.
 public protocol FloatingPanelFullScreenLayout: FloatingPanelLayout { }

-public extension FloatingPanelFullScreenLayout {
-    var positionReference: FloatingPanelLayoutReference {
-        return .fromSuperview
-    }
-}
-
 /// FloatingPanelIntrinsicLayout
 ///
 /// Use the layout protocol if you want to layout a panel using the intrinsic height.
-/// It can't be used with `FloatingPanelFullScreenLayout`.
+/// It can't be used with FloatingPanelFullScreenLayout.
 ///
 /// - Attention:
 ///     `insetFor(position:)` must return `nil` for the full position. Because
 ///     the inset is determined automatically by the intrinsic height.
 ///     You can customize insets only for the half, tip and hidden positions.
-///
-/// - Note:
-///     By default, the `positionReference` is set to `.fromSafeArea`.
 public protocol FloatingPanelIntrinsicLayout: FloatingPanelLayout { }

 public extension FloatingPanelIntrinsicLayout {
@@ -43,15 +34,6 @@ public extension FloatingPanelIntrinsicLayout {
    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
        return nil
    }
-
-    var positionReference: FloatingPanelLayoutReference {
-        return .fromSafeArea
-    }
-}
-
-public enum FloatingPanelLayoutReference: Int {
-    case fromSafeArea = 0
-    case fromSuperview = 1
 }

 public protocol FloatingPanelLayout: class {
@@ -61,16 +43,14 @@ public protocol FloatingPanelLayout: class {
    /// Returns a set of FloatingPanelPosition objects to tell the applicable
    /// positions of the floating panel controller.
    ///
-    /// By default, it returns full, half and tip positions.
+    /// By default, it returns all position except for `hidden` position. Because
+    /// it's always supported by `FloatingPanelController` so you don't need to return it.
    var supportedPositions: Set<FloatingPanelPosition> { get }

    /// Return the interaction buffer to the top from the top position. Default is 6.0.
    var topInteractionBuffer: CGFloat { get }

    /// Return the interaction buffer to the bottom from the bottom position. Default is 6.0.
-    ///
-    /// - Important:
-    /// The specified buffer is ignored when `FloatingPanelController.isRemovalInteractionEnabled` is set to true.
    var bottomInteractionBuffer: CGFloat { get }

    /// Returns a CGFloat value to determine a Y coordinate of a floating panel for each position(full, half, tip and hidden).
@@ -92,9 +72,6 @@ public protocol FloatingPanelLayout: class {
    ///
    /// Default is 0.3 at full position, otherwise 0.0.
    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat
-
-    var positionReference: FloatingPanelLayoutReference { get }
-
 }

 public extension FloatingPanelLayout {
@@ -115,10 +92,6 @@ public extension FloatingPanelLayout {
    func backdropAlphaFor(position: FloatingPanelPosition) -> CGFloat {
        return position == .full ? 0.3 : 0.0
    }
-
-    var positionReference: FloatingPanelLayoutReference {
-        return .fromSafeArea
-    }
 }

 public class FloatingPanelDefaultLayout: FloatingPanelLayout {
@@ -157,13 +130,9 @@ public class FloatingPanelDefaultLandscapeLayout: FloatingPanelLayout {
    }
 }

-struct LayoutSegment {
-    let lower: FloatingPanelPosition?
-    let upper: FloatingPanelPosition?
-}

 class FloatingPanelLayoutAdapter {
-    weak var vc: FloatingPanelController!
+    weak var vc: UIViewController!
    private weak var surfaceView: FloatingPanelSurfaceView!
    private weak var backdropView: FloatingPanelBackdropView!

@@ -185,8 +154,6 @@ class FloatingPanelLayoutAdapter {
    private var tipConstraints: [NSLayoutConstraint] = []
    private var offConstraints: [NSLayoutConstraint] = []
    private var interactiveTopConstraint: NSLayoutConstraint?
-    private var bottomConstraint: NSLayoutConstraint?
-

    private var heightConstraint: NSLayoutConstraint?

@@ -208,31 +175,70 @@ class FloatingPanelLayoutAdapter {
    }

    var supportedPositions: Set<FloatingPanelPosition> {
-        return layout.supportedPositions
+        var supportedPositions = layout.supportedPositions
+        supportedPositions.remove(.hidden)
+        return supportedPositions
    }

    var topMostState: FloatingPanelPosition {
-        return supportedPositions.sorted(by: { $0.rawValue < $1.rawValue }).first ?? .hidden
-    }
-
-    var bottomMostState: FloatingPanelPosition {
-        return supportedPositions.sorted(by: { $0.rawValue < $1.rawValue }).last ?? .hidden
+        if supportedPositions.contains(.full) {
+            return .full
+        }
+        if supportedPositions.contains(.half) {
+            return .half
+        }
+        return .tip
    }

    var topY: CGFloat {
-        return positionY(for: topMostState)
+        if supportedPositions.contains(.full) {
+            switch layout {
+            case is FloatingPanelIntrinsicLayout:
+                return surfaceView.superview!.bounds.height - surfaceView.bounds.height
+            case is FloatingPanelFullScreenLayout:
+                return fullInset
+            default:
+                return (safeAreaInsets.top + fullInset)
+            }
+        } else {
+            return middleY
+        }
+    }
+
+    var middleY: CGFloat {
+        if layout is FloatingPanelFullScreenLayout {
+            return surfaceView.superview!.bounds.height - halfInset
+        } else{
+            return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + halfInset)
+        }
    }

    var bottomY: CGFloat {
-        return positionY(for: bottomMostState)
+        if supportedPositions.contains(.tip) {
+            if layout is FloatingPanelFullScreenLayout {
+                return surfaceView.superview!.bounds.height - tipInset
+            } else{
+                return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + tipInset)
+            }
+        } else {
+            return middleY
+        }
+    }
+
+    var hiddenY: CGFloat {
+        return surfaceView.superview!.bounds.height
    }

    var topMaxY: CGFloat {
-        return topY - layout.topInteractionBuffer
+        return layout is FloatingPanelFullScreenLayout ? 0.0 : safeAreaInsets.top
    }

    var bottomMaxY: CGFloat {
-        return bottomY + layout.bottomInteractionBuffer
+        if layout is FloatingPanelFullScreenLayout{
+            return surfaceView.superview!.bounds.height - hiddenInset
+        } else {
+            return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + hiddenInset)
+        }
    }

    var adjustedContentInsets: UIEdgeInsets {
@@ -245,31 +251,13 @@ class FloatingPanelLayoutAdapter {
    func positionY(for pos: FloatingPanelPosition) -> CGFloat {
        switch pos {
        case .full:
-            if layout is FloatingPanelIntrinsicLayout {
-                return surfaceView.superview!.bounds.height - surfaceView.bounds.height
-            }
-            switch layout.positionReference {
-            case .fromSafeArea:
-                return (safeAreaInsets.top + fullInset)
-            case .fromSuperview:
-                return fullInset
-            }
+            return topY
        case .half:
-            switch layout.positionReference {
-            case .fromSafeArea:
-                return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + halfInset)
-            case .fromSuperview:
-                return surfaceView.superview!.bounds.height - halfInset
-            }
+            return middleY
        case .tip:
-            switch layout.positionReference {
-            case .fromSafeArea:
-                return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + tipInset)
-            case .fromSuperview:
-                return surfaceView.superview!.bounds.height - tipInset
-            }
+            return bottomY
        case .hidden:
-            return surfaceView.superview!.bounds.height - hiddenInset
+            return hiddenY
        }
    }

@@ -303,14 +291,10 @@ class FloatingPanelLayoutAdapter {
                  ", content safe area(bottom) =", safeAreaBottom)
    }

-    func prepareLayout(in vc: FloatingPanelController) {
+    func prepareLayout(in vc: UIViewController) {
        self.vc = vc

        NSLayoutConstraint.deactivate(fixedConstraints + fullConstraints + halfConstraints + tipConstraints + offConstraints)
-        NSLayoutConstraint.deactivate(constraint: self.heightConstraint)
-        self.heightConstraint = nil
-        NSLayoutConstraint.deactivate(constraint: self.bottomConstraint)
-        self.bottomConstraint = nil

        surfaceView.translatesAutoresizingMaskIntoConstraints = false
        backdropView.translatesAutoresizingMaskIntoConstraints = false
@@ -326,14 +310,9 @@ class FloatingPanelLayoutAdapter {

        fixedConstraints = surfaceConstraints + backdropConstraints

-        if vc.contentMode == .fitToBounds {
-            bottomConstraint = surfaceView.bottomAnchor.constraint(equalTo: vc.view.bottomAnchor,
-                                                                   constant: 0.0)
-        }
-
        // Flexible surface constraints for full, half, tip and off
        let topAnchor: NSLayoutYAxisAnchor = {
-            if layout.positionReference == .fromSuperview {
+            if layout is FloatingPanelFullScreenLayout {
                return vc.view.topAnchor
            } else {
                return vc.layoutGuide.topAnchor
@@ -352,7 +331,7 @@ class FloatingPanelLayoutAdapter {
        }

        let bottomAnchor: NSLayoutYAxisAnchor = {
-            if layout.positionReference == .fromSuperview {
+            if layout is FloatingPanelFullScreenLayout {
                return vc.view.bottomAnchor
            } else {
                return vc.layoutGuide.bottomAnchor
@@ -374,20 +353,20 @@ class FloatingPanelLayoutAdapter {
        ]
    }

-    func startInteraction(at state: FloatingPanelPosition, offset: CGPoint = .zero) {
-        guard self.interactiveTopConstraint == nil else { return }
+    func startInteraction(at state: FloatingPanelPosition) {
        NSLayoutConstraint.deactivate(fullConstraints + halfConstraints + tipConstraints + offConstraints)

        let interactiveTopConstraint: NSLayoutConstraint
-        switch layout.positionReference {
-        case .fromSafeArea:
-            initialConst = surfaceView.frame.minY - safeAreaInsets.top + offset.y
-            interactiveTopConstraint = surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.topAnchor,
-                                                                        constant: initialConst)
-        case .fromSuperview:
-            initialConst = surfaceView.frame.minY + offset.y
+        switch layout {
+        case is FloatingPanelIntrinsicLayout,
+             is FloatingPanelFullScreenLayout:
+            initialConst = surfaceView.frame.minY
            interactiveTopConstraint = surfaceView.topAnchor.constraint(equalTo: vc.view.topAnchor,
                                                                        constant: initialConst)
+        default:
+            initialConst = surfaceView.frame.minY - safeAreaInsets.top
+            interactiveTopConstraint = surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.topAnchor,
+                                                                        constant: initialConst)
        }
        NSLayoutConstraint.activate([interactiveTopConstraint])
        self.interactiveTopConstraint = interactiveTopConstraint
@@ -396,75 +375,67 @@ class FloatingPanelLayoutAdapter {
    func endInteraction(at state: FloatingPanelPosition) {
        // Don't deactivate `interactiveTopConstraint` here because it leads to
        // unsatisfiable constraints
-
-        if self.interactiveTopConstraint == nil {
-            // Actiavate `interactiveTopConstraint` for `fitToBounds` mode.
-            // It goes throught this path when the pan gesture state jumps
-            // from .begin to .end.
-            startInteraction(at: state)
-        }
    }

    // The method is separated from prepareLayout(to:) for the rotation support
    // It must be called in FloatingPanelController.traitCollectionDidChange(_:)
    func updateHeight() {
        guard let vc = vc else { return }
-        NSLayoutConstraint.deactivate(constraint: heightConstraint)
-        heightConstraint = nil

-        if layout is FloatingPanelIntrinsicLayout {
-            updateIntrinsicHeight()
-        }
-        defer {
-            if layout is FloatingPanelIntrinsicLayout {
-                NSLayoutConstraint.deactivate(fullConstraints)
-                fullConstraints = [
-                    surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.bottomAnchor,
-                                                     constant: -fullInset),
-                ]
-            }
+        if let const = self.heightConstraint {
+            NSLayoutConstraint.deactivate([const])
        }

-        guard vc.contentMode != .fitToBounds else { return }
+        let heightConstraint: NSLayoutConstraint

        switch layout {
        case is FloatingPanelIntrinsicLayout:
+            updateIntrinsicHeight()
            heightConstraint = surfaceView.heightAnchor.constraint(equalToConstant: intrinsicHeight + safeAreaInsets.bottom)
        default:
            let const = -(positionY(for: topMostState))
            heightConstraint =  surfaceView.heightAnchor.constraint(equalTo: vc.view.heightAnchor,
                                                                    constant: const)
        }
-        NSLayoutConstraint.activate(constraint: heightConstraint)
+
+        NSLayoutConstraint.activate([heightConstraint])
+        self.heightConstraint = heightConstraint

        surfaceView.bottomOverflow = vc.view.bounds.height + layout.topInteractionBuffer
+
+        if layout is FloatingPanelIntrinsicLayout {
+            NSLayoutConstraint.deactivate(fullConstraints)
+            fullConstraints = [
+                surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.bottomAnchor,
+                                                 constant: -fullInset),
+            ]
+        }
    }

    func updateInteractiveTopConstraint(diff: CGFloat, allowsTopBuffer: Bool, with behavior: FloatingPanelBehavior) {
        defer {
-            layoutSurfaceIfNeeded() // MUST be called to update `surfaceView.frame`
+            surfaceView.superview!.layoutIfNeeded() // MUST call here to update `surfaceView.frame`
        }

        let topMostConst: CGFloat = {
            var ret: CGFloat = 0.0
-            switch layout.positionReference {
-            case .fromSafeArea:
-                ret = topY - safeAreaInsets.top
-            case .fromSuperview:
+            switch layout {
+            case is FloatingPanelIntrinsicLayout, is FloatingPanelFullScreenLayout:
                ret = topY
+            default:
+                ret = topY - safeAreaInsets.top
            }
            return max(ret, 0.0) // The top boundary is equal to the related topAnchor.
        }()
        let bottomMostConst: CGFloat = {
            var ret: CGFloat = 0.0
-            let _bottomY = vc.isRemovalInteractionEnabled ? positionY(for: .hidden) : bottomY
-            switch layout.positionReference {
-            case .fromSafeArea:
-                ret = _bottomY - safeAreaInsets.top
-            case .fromSuperview:
-                ret = _bottomY
+            switch layout {
+            case is FloatingPanelIntrinsicLayout, is FloatingPanelFullScreenLayout:
+                ret = bottomY
+            default:
+                ret = bottomY - safeAreaInsets.top
            }
-            return min(ret, surfaceView.superview!.bounds.height)
+            return min(ret, bottomMaxY)
        }()
        let minConst = allowsTopBuffer ? topMostConst - layout.topInteractionBuffer : topMostConst
        let maxConst = bottomMostConst + layout.bottomInteractionBuffer
@@ -494,29 +465,23 @@ class FloatingPanelLayoutAdapter {
        return (1.0 - (1.0 / ((buffer * 0.55 / base) + 1.0))) * base
    }

-    func activateFixedLayout() {
-        // Must deactivate `interactiveTopConstraint` here
-        NSLayoutConstraint.deactivate(constraint: self.interactiveTopConstraint)
-        self.interactiveTopConstraint = nil
-
-        NSLayoutConstraint.activate(fixedConstraints)
-
-        if vc.contentMode == .fitToBounds {
-            NSLayoutConstraint.activate(constraint: self.bottomConstraint)
-        }
-    }
-
-    func activateInteractiveLayout(of state: FloatingPanelPosition) {
+    func activateLayout(of state: FloatingPanelPosition) {
        defer {
-            layoutSurfaceIfNeeded()
-            log.debug("activateLayout -- surface.presentation = \(self.surfaceView.presentationFrame) surface.frame = \(self.surfaceView.frame)")
+            surfaceView.superview!.layoutIfNeeded()
        }

        var state = state

        setBackdropAlpha(of: state)

-        if isValid(state) == false {
+        // Must deactivate `interactiveTopConstraint` here
+        if let interactiveTopConstraint = interactiveTopConstraint {
+            NSLayoutConstraint.deactivate([interactiveTopConstraint])
+            self.interactiveTopConstraint = nil
+        }
+        NSLayoutConstraint.activate(fixedConstraints)
+
+        if supportedPositions.union([.hidden]).contains(state) == false {
            state = layout.initialPosition
        }

@@ -533,22 +498,6 @@ class FloatingPanelLayoutAdapter {
        }
    }

-    func activateLayout(of state: FloatingPanelPosition) {
-        activateFixedLayout()
-        activateInteractiveLayout(of: state)
-    }
-
-    func isValid(_ state: FloatingPanelPosition) -> Bool {
-        return supportedPositions.union([.hidden]).contains(state)
-    }
-
-    private func layoutSurfaceIfNeeded() {
-        #if !TEST
-        guard surfaceView.window != nil else { return }
-        #endif
-        surfaceView.superview?.layoutIfNeeded()
-    }
-
    private func setBackdropAlpha(of target: FloatingPanelPosition) {
        if target == .hidden {
            self.backdropView.alpha = 0.0
@@ -560,7 +509,7 @@ class FloatingPanelLayoutAdapter {
    private func checkLayoutConsistance() {
        // Verify layout configurations
        assert(supportedPositions.count > 0)
-        assert(supportedPositions.contains(layout.initialPosition),
+        assert(supportedPositions.union([.hidden]).contains(layout.initialPosition),
               "Does not include an initial position (\(layout.initialPosition)) in supportedPositions (\(supportedPositions))")

        if layout is FloatingPanelIntrinsicLayout {
@@ -579,38 +528,4 @@ class FloatingPanelLayoutAdapter {
            assert(bottomY > topY, "Invalid insets { topY: \(topY), bottomY: \(bottomY) }")
         }*/
    }
-
-    func segument(at posY: CGFloat, forward: Bool) -> LayoutSegment {
-        /// ----------------------->Y
-        /// --> forward                <-- backward
-        /// |-------|===o===|-------|  |-------|-------|===o===|
-        /// |-------|-------x=======|  |-------|=======x-------|
-        /// |-------|-------|===o===|  |-------|===o===|-------|
-        /// pos: o/x, seguement: =
-        let sortedPositions = supportedPositions.sorted(by: { $0.rawValue < $1.rawValue })
-
-        let upperIndex: Int?
-        if forward {
-            #if swift(>=4.2)
-            upperIndex = sortedPositions.firstIndex(where: { posY < positionY(for: $0) })
-            #else
-            upperIndex = sortedPositions.index(where: { posY < positionY(for: $0) })
-            #endif
-        } else {
-            #if swift(>=4.2)
-            upperIndex = sortedPositions.firstIndex(where: { posY <= positionY(for: $0) })
-            #else
-            upperIndex = sortedPositions.index(where: { posY <= positionY(for: $0) })
-            #endif
-        }
-
-        switch upperIndex {
-        case 0:
-            return LayoutSegment(lower: nil, upper: sortedPositions.first)
-        case let upperIndex?:
-            return LayoutSegment(lower: sortedPositions[upperIndex - 1], upper: sortedPositions[upperIndex])
-        default:
-            return LayoutSegment(lower: sortedPositions[sortedPositions.endIndex - 1], upper: nil)
-        }
-    }
 }
@@ -15,7 +15,7 @@ public class FloatingPanelSurfaceView: UIView {
    public let grabberHandle: GrabberHandleView = GrabberHandleView()

    /// Offset of the grabber handle from the top
-    public var grabberTopPadding: CGFloat = 6.0 { didSet {
+    @objc dynamic public var grabberTopPadding: CGFloat = 6.0 { didSet {
        setNeedsUpdateConstraints()
    } }

@@ -25,17 +25,19 @@ public class FloatingPanelSurfaceView: UIView {
    }

    /// Grabber view width and height
-    public var grabberHandleWidth: CGFloat = 36.0 { didSet {
+    @objc dynamic public var grabberHandleWidth: CGFloat = 36.0 { didSet {
        setNeedsUpdateConstraints()
    } }
-    public var grabberHandleHeight: CGFloat = 5.0 { didSet {
+    @objc dynamic public var grabberHandleHeight: CGFloat = 5.0 { didSet {
        setNeedsUpdateConstraints()
    } }

    /// A root view of a content view controller
    public weak var contentView: UIView!
-
+    
    /// The content insets specifying the insets around the content view.
+    ///
+    /// - important: Currently the `bottom` inset is ignored.
    public var contentInsets: UIEdgeInsets = .zero {
        didSet {
            // Needs update constraints
@@ -46,7 +48,7 @@ public class FloatingPanelSurfaceView: UIView {
    private var color: UIColor? = .white { didSet { setNeedsLayout() } }
    var bottomOverflow: CGFloat = 0.0 // Must not call setNeedsLayout()

-    public override var backgroundColor: UIColor? {
+    @objc dynamic public override var backgroundColor: UIColor? {
        get { return color }
        set { color = newValue }
    }
@@ -55,34 +57,34 @@ public class FloatingPanelSurfaceView: UIView {
    ///
    /// `self.contentView` is masked with the top rounded corners automatically on iOS 11 and later.
    /// On iOS 10, they are not automatically masked because of a UIVisualEffectView issue. See https://forums.developer.apple.com/thread/50854
-    public var cornerRadius: CGFloat {
+    @objc dynamic public var cornerRadius: CGFloat {
        set { containerView.layer.cornerRadius = newValue; setNeedsLayout() }
        get { return containerView.layer.cornerRadius }
    }

    /// A Boolean indicating whether the surface shadow is displayed.
-    public var shadowHidden: Bool = false  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowHidden: Bool = false { didSet { setNeedsLayout() } }

    /// The color of the surface shadow.
-    public var shadowColor: UIColor = .black  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowColor: UIColor = .black  { didSet { setNeedsLayout() } }

    /// The offset (in points) of the surface shadow.
-    public var shadowOffset: CGSize = CGSize(width: 0.0, height: 1.0)  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowOffset: CGSize = CGSize(width: 0.0, height: 1.0)  { didSet { setNeedsLayout() } }

    /// The opacity of the surface shadow.
-    public var shadowOpacity: Float = 0.2 { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowOpacity: Float = 0.2 { didSet { setNeedsLayout() } }

    /// The blur radius (in points) used to render the surface shadow.
-    public var shadowRadius: CGFloat = 3  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowRadius: CGFloat = 3  { didSet { setNeedsLayout() } }

    /// The width of the surface border.
-    public var borderColor: UIColor?  { didSet { setNeedsLayout() } }
+    @objc dynamic public var borderColor: UIColor?  { didSet { setNeedsLayout() } }

    /// The color of the surface border.
-    public var borderWidth: CGFloat = 0.0  { didSet { setNeedsLayout() } }
+    @objc dynamic public var borderWidth: CGFloat = 0.0  { didSet { setNeedsLayout() } }

-    /// The margins to use when laying out the container view wrapping content.
-    public var containerMargins: UIEdgeInsets = .zero { didSet {
+    /// Offset of the container view from the top
+    @objc dynamic public var containerTopInset: CGFloat = 0.0 { didSet {
        setNeedsUpdateConstraints()
    } }

@@ -97,11 +99,9 @@ public class FloatingPanelSurfaceView: UIView {
    @available(*, unavailable, renamed: "containerView")
    public var backgroundView: UIView!

-    private lazy var containerViewTopConstraint = containerView.topAnchor.constraint(equalTo: topAnchor, constant: containerMargins.top)
-    private lazy var containerViewHeightConstraint = containerView.heightAnchor.constraint(equalTo: heightAnchor, multiplier: 1.0)
-    private lazy var containerViewLeftConstraint = containerView.leftAnchor.constraint(equalTo: leftAnchor, constant: 0.0)
-    private lazy var containerViewRightConstraint = containerView.rightAnchor.constraint(equalTo: rightAnchor, constant: 0.0)
-
+    private lazy var containerViewTopInsetConstraint: NSLayoutConstraint = containerView.topAnchor.constraint(equalTo: topAnchor, constant: containerTopInset)
+    private lazy var containerViewHeightConstraint: NSLayoutConstraint = containerView.heightAnchor.constraint(equalTo: heightAnchor, multiplier: 1.0)
+    
    /// The content view top constraint
    private var contentViewTopConstraint: NSLayoutConstraint?
    /// The content view left constraint
@@ -111,11 +111,9 @@ public class FloatingPanelSurfaceView: UIView {
    /// The content height constraint
    private var contentViewHeightConstraint: NSLayoutConstraint?

-    private lazy var grabberHandleWidthConstraint = grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandleWidth)
-    private lazy var grabberHandleHeightConstraint = grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandleHeight)
-    private lazy var grabberHandleTopConstraint = grabberHandle.topAnchor.constraint(equalTo: topAnchor, constant: grabberTopPadding)
-
-    public override class var requiresConstraintBasedLayout: Bool { return true }
+    private lazy var grabberHandleWidthConstraint: NSLayoutConstraint = grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandleWidth)
+    private lazy var grabberHandleHeightConstraint: NSLayoutConstraint = grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandleHeight)
+    private lazy var grabberHandleTopConstraint: NSLayoutConstraint = grabberHandle.topAnchor.constraint(equalTo: topAnchor, constant: grabberTopPadding)

    override init(frame: CGRect) {
        super.init(frame: frame)
@@ -134,9 +132,9 @@ public class FloatingPanelSurfaceView: UIView {
        addSubview(containerView)
        containerView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
-            containerViewTopConstraint,
-            containerViewLeftConstraint,
-            containerViewRightConstraint,
+            containerViewTopInsetConstraint,
+            containerView.leftAnchor.constraint(equalTo: leftAnchor, constant: 0.0),
+            containerView.rightAnchor.constraint(equalTo: rightAnchor, constant: 0.0),
            containerViewHeightConstraint,
            ])

@@ -151,21 +149,18 @@ public class FloatingPanelSurfaceView: UIView {
    }

    public override func updateConstraints() {
-        containerViewTopConstraint.constant = containerMargins.top
-        containerViewLeftConstraint.constant = containerMargins.left
-        containerViewRightConstraint.constant = -containerMargins.right
-        containerViewHeightConstraint.constant = (containerMargins.bottom == 0) ? bottomOverflow : -(containerMargins.top + containerMargins.bottom)
+        super.updateConstraints()
+        containerViewTopInsetConstraint.constant = containerTopInset
+        containerViewHeightConstraint.constant = bottomOverflow

-        contentViewTopConstraint?.constant = containerMargins.top + contentInsets.top
-        contentViewLeftConstraint?.constant = containerMargins.left + contentInsets.left
-        contentViewRightConstraint?.constant = containerMargins.right + contentInsets.right
-        contentViewHeightConstraint?.constant = -(containerMargins.top + containerMargins.bottom + contentInsets.top + contentInsets.bottom)
+        contentViewTopConstraint?.constant = contentInsets.top
+        contentViewLeftConstraint?.constant = contentInsets.left
+        contentViewRightConstraint?.constant = contentInsets.right
+        contentViewHeightConstraint?.constant = -containerTopInset

        grabberHandleTopConstraint.constant = grabberTopPadding
        grabberHandleWidthConstraint.constant = grabberHandleWidth
        grabberHandleHeightConstraint.constant = grabberHandleHeight
-
-        super.updateConstraints()
    }

    public override func layoutSubviews() {
@@ -200,7 +195,6 @@ public class FloatingPanelSurfaceView: UIView {
            return
        }
        containerView.layer.masksToBounds = true
-        guard containerMargins.bottom == 0 else { return }
        if #available(iOS 11, *) {
            // Don't use `contentView.clipToBounds` because it prevents content view from expanding the height of a subview of it
            // for the bottom overflow like Auto Layout settings of UIVisualEffectView in Main.storyboard of Example/Maps.
@@ -223,11 +217,10 @@ public class FloatingPanelSurfaceView: UIView {
        /* contentView.frame = bounds */ // MUST NOT: Because the top safe area inset of a content VC will be incorrect.
        contentView.translatesAutoresizingMaskIntoConstraints = false

-        let topConstraint = contentView.topAnchor.constraint(equalTo: topAnchor, constant: containerMargins.top + contentInsets.top)
-        let leftConstraint = contentView.leftAnchor.constraint(equalTo: leftAnchor, constant: containerMargins.left + contentInsets.left)
-        let rightConstraint = rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: containerMargins.right + contentInsets.right)
-        let heightPadding = containerMargins.top + containerMargins.bottom + contentInsets.top + contentInsets.bottom
-        let heightConstraint = contentView.heightAnchor.constraint(equalTo: heightAnchor, constant: -heightPadding)
+        let topConstraint = contentView.topAnchor.constraint(equalTo: topAnchor, constant: contentInsets.top)
+        let leftConstraint = contentView.leftAnchor.constraint(equalTo: leftAnchor, constant: contentInsets.left)
+        let rightConstraint = rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: contentInsets.right)
+        let heightConstraint = contentView.heightAnchor.constraint(equalTo: heightAnchor, constant: -containerTopInset)
        NSLayoutConstraint.activate([
            topConstraint,
            leftConstraint,
@@ -59,7 +59,9 @@ class FloatingPanelPresentationController: UIPresentationController {
        // Forward touch events to the presenting view controller
        (fpc.view as? FloatingPanelPassThroughView)?.eventForwardingView = presentingViewController.view

-        fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+        // Set tap-to-dismiss in the backdrop view
+        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleBackdrop(tapGesture:)))
+        fpc.backdropView.addGestureRecognizer(tapGesture)
    }

    @objc func handleBackdrop(tapGesture: UITapGestureRecognizer) {
@@ -7,7 +7,9 @@ import UIKit

 public class GrabberHandleView: UIView {

-    public var barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0) { didSet { backgroundColor = barColor } }
+    @objc dynamic public var barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0) {
+        didSet { backgroundColor = barColor }
+    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.7.1</string>
+	<string>1.5.1</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 </dict>
@@ -21,7 +21,7 @@ class CustomLayoutGuide: LayoutGuideProvider {
 }

 extension UIViewController {
-    @objc var layoutInsets: UIEdgeInsets {
+    var layoutInsets: UIEdgeInsets {
        if #available(iOS 11.0, *) {
            return view.safeAreaInsets
        } else {
@@ -60,10 +60,6 @@ extension UIView {
            return self
        }
    }
-
-    var presentationFrame: CGRect {
-        return layer.presentation()?.frame ?? frame
-    }
 }

 extension UIView {
@@ -75,12 +71,6 @@ extension UIView {
    func enableAutoLayout() {
        translatesAutoresizingMaskIntoConstraints = false
    }
-
-    static func performWithLinear(startTime: Double = 0.0, relativeDuration: Double = 1.0, _ animations: @escaping (() -> Void)) {
-        UIView.animateKeyframes(withDuration: 0.0, delay: 0.0, options: [.calculationModeCubic], animations: {
-            UIView.addKeyframe(withRelativeStartTime: startTime, relativeDuration: relativeDuration, animations: animations)
-        }, completion: nil)
-    }
 }

 #if __FP_LOG
@@ -117,9 +107,6 @@ extension UIScrollView {
    var contentOffsetZero: CGPoint {
        return CGPoint(x: 0.0, y: 0.0 - contentInset.top)
    }
-    var isLocked: Bool {
-        return !showsVerticalScrollIndicator && !bounces &&  isDirectionalLockEnabled
-    }
 }

 extension UISpringTimingParameters {
@@ -137,23 +124,3 @@ extension CGPoint {
                       y: CGFloat.nan)
    }
 }
-
-extension UITraitCollection {
-    func shouldUpdateLayout(from previous: UITraitCollection) -> Bool {
-        return previous.horizontalSizeClass != horizontalSizeClass
-            || previous.verticalSizeClass != verticalSizeClass
-            || previous.preferredContentSizeCategory != preferredContentSizeCategory
-            || previous.layoutDirection != layoutDirection
-    }
-}
-
-extension NSLayoutConstraint {
-    static func activate(constraint: NSLayoutConstraint?) {
-        guard let constraint = constraint else { return }
-        self.activate([constraint])
-    }
-    static func deactivate(constraint: NSLayoutConstraint?) {
-        guard let constraint = constraint else { return }
-        self.deactivate([constraint])
-    }
-}
@@ -7,7 +7,9 @@ import XCTest
@testable import FloatingPanel

 class FloatingPanelControllerTests: XCTestCase {
+
    override func setUp() {}
+
    override func tearDown() {}

    func test_warningRetainCycle() {
@@ -26,125 +28,24 @@ class FloatingPanelControllerTests: XCTestCase {

    func test_addPanel() {
        guard let rootVC = UIApplication.shared.keyWindow?.rootViewController else { fatalError() }
+
        let fpc = FloatingPanelController()
        fpc.addPanel(toParent: rootVC)
+
+        waitRunLoop(secs: 1.0)
        XCTAssert(fpc.surfaceView.frame.minY ==  (fpc.view.bounds.height - fpc.layoutInsets.bottom) - fpc.layout.insetFor(position: .half)!)
-        fpc.move(to: .tip, animated: false)
-        XCTAssert(fpc.surfaceView.frame.minY == (fpc.view.bounds.height - fpc.layoutInsets.bottom) - fpc.layout.insetFor(position: .tip)!)
-    }
-
-    @available(iOS 12.0, *)
-    func test_updateLayout_willTransition() {
-        class MyDelegate: FloatingPanelControllerDelegate {
-            func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-                if newCollection.userInterfaceStyle == .dark {
-                    XCTFail()
-                }
-                return nil
-            }
-        }
-        let myDelegate = MyDelegate()
-        let fpc = FloatingPanelController(delegate: myDelegate)
-        let traitCollection = UITraitCollection(traitsFrom: [fpc.traitCollection,
-                                                             UITraitCollection(userInterfaceStyle: .dark)])
-        XCTAssertEqual(traitCollection.userInterfaceStyle, .dark)
-        fpc.prepare(for: traitCollection)
-    }
-
-    func test_moveTo() {
-        let delegate = FloatingPanelTestDelegate()
-        let fpc = FloatingPanelController(delegate: delegate)
-        XCTAssertEqual(delegate.position, .hidden)
-        fpc.showForTest()
-        XCTAssertEqual(delegate.position, .half)
-
-        fpc.hide()
-        XCTAssertEqual(delegate.position, .hidden)
-        
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(fpc.position, .full)
-        XCTAssertEqual(delegate.position, .full)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .full))
-
-        fpc.move(to: .half, animated: false)
-        XCTAssertEqual(fpc.position, .half)
-        XCTAssertEqual(delegate.position, .half)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .half))
-
-        fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(fpc.position, .tip)
-        XCTAssertEqual(delegate.position, .tip)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .tip))
-
-        fpc.move(to: .hidden, animated: false)
-        XCTAssertEqual(fpc.position, .hidden)
-        XCTAssertEqual(delegate.position, .hidden)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .hidden))
-
-        fpc.move(to: .full, animated: true)
-        XCTAssertEqual(fpc.position, .full)
-        XCTAssertEqual(delegate.position, .full)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .full))
-
-        fpc.move(to: .half, animated: true)
-        XCTAssertEqual(fpc.position, .half)
-        XCTAssertEqual(delegate.position, .half)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .half))

        fpc.move(to: .tip, animated: true)
-        XCTAssertEqual(fpc.position, .tip)
-        XCTAssertEqual(delegate.position, .tip)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .tip))
-
-        fpc.move(to: .hidden, animated: true)
-        XCTAssertEqual(fpc.position, .hidden)
-        XCTAssertEqual(delegate.position, .hidden)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .hidden))
-    }
-
-    func test_originSurfaceY() {
-        let fpc = FloatingPanelController(delegate: nil)
-        fpc.loadViewIfNeeded()
-        fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
-        fpc.show(animated: false, completion: nil)
-
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .full))
-        fpc.move(to: .half, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .half))
-        fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .tip))
-        fpc.move(to: .hidden, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.minY, fpc.originYOfSurface(for: .hidden))
-    }
-
-    func test_contentMode() {
-        let fpc = FloatingPanelController(delegate: nil)
-        fpc.loadViewIfNeeded()
-        fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
-        fpc.show(animated: false, completion: nil)
-
-        fpc.contentMode = .static
-
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.originYOfSurface(for: .full))
-        fpc.move(to: .half, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.originYOfSurface(for: .full))
-        fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.originYOfSurface(for: .full))
-
-        fpc.contentMode = .fitToBounds
-
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.originYOfSurface(for: .full))
-        fpc.move(to: .half, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.originYOfSurface(for: .half))
-        fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(fpc.surfaceView.frame.height, fpc.view.bounds.height - fpc.originYOfSurface(for: .tip))
+        waitRunLoop(secs: 1.0)
+        XCTAssert(fpc.surfaceView.frame.minY == (fpc.view.bounds.height - fpc.layoutInsets.bottom) - fpc.layout.insetFor(position: .tip)!)
    }
 }

-private class MyZombieViewController: UIViewController, FloatingPanelLayout, FloatingPanelBehavior, FloatingPanelControllerDelegate {
+func waitRunLoop(secs: TimeInterval = 0) {
+    RunLoop.main.run(until: Date(timeIntervalSinceNow: secs))
+}
+
+class MyZombieViewController: UIViewController, FloatingPanelLayout, FloatingPanelBehavior, FloatingPanelControllerDelegate {
    var fpc: FloatingPanelController?
    override func viewDidLoad() {
        fpc = FloatingPanelController(delegate: self)
@@ -1,254 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2019/06/27.
-//  Copyright © 2019 scenee. All rights reserved.
-//
-
-import XCTest
-@testable import FloatingPanel
-
-class FloatingPanelLayoutTests: XCTestCase {
-    var fpc: FloatingPanelController!
-    override func setUp() {
-        fpc = FloatingPanelController(delegate: nil)
-        fpc.loadViewIfNeeded()
-        fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
-    }
-    override func tearDown() {}
-
-    func test_layoutAdapter_topAndBottomMostState() {
-        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.topMostState, .full)
-        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.bottomMostState, .tip)
-
-        class FloatingPanelLayoutWithHidden: FloatingPanelLayout {
-            func insetFor(position: FloatingPanelPosition) -> CGFloat? { return nil }
-            let initialPosition: FloatingPanelPosition = .hidden
-            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .half, .full]
-        }
-        class FloatingPanelLayout2Positions: FloatingPanelLayout {
-            func insetFor(position: FloatingPanelPosition) -> CGFloat? { return nil }
-            let initialPosition: FloatingPanelPosition = .tip
-            let supportedPositions: Set<FloatingPanelPosition> = [.tip, .half]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayoutWithHidden()
-        fpc.delegate = delegate
-        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.topMostState, .full)
-        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.bottomMostState, .hidden)
-
-        delegate.layout = FloatingPanelLayout2Positions()
-        fpc.delegate = delegate
-        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.topMostState, .half)
-        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.bottomMostState, .tip)
-    }
-
-    func test_layoutSegment_3position() {
-        class FloatingPanelLayout3Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .half
-            let supportedPositions: Set<FloatingPanelPosition> = [.tip, .half, .full]
-        }
-
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3Positions()
-        fpc.delegate = delegate
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-
-        let minPos = CGFloat.leastNormalMagnitude
-        let maxPos = CGFloat.greatestFiniteMagnitude
-
-        assertLayoutSegment(fpc.floatingPanel, with: [
-            (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
-            (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
-            (#line, pos: fullPos, forwardY: true, lower: .full, upper: .half),
-            (#line, pos: fullPos, forwardY: false, lower: nil,  upper: .full),
-            (#line, pos: halfPos, forwardY: true, lower: .half, upper: .tip),
-            (#line, pos: halfPos, forwardY: false, lower: .full,  upper: .half),
-            (#line, pos: tipPos, forwardY: true, lower: .tip, upper: nil),
-            (#line, pos: tipPos, forwardY: false, lower: .half,  upper: .tip),
-            (#line, pos: maxPos, forwardY: true, lower: .tip, upper: nil),
-            (#line, pos: maxPos, forwardY: false, lower: .tip, upper: nil),
-            ])
-    }
-
-    func test_layoutSegment_2positions() {
-        class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .half
-            let supportedPositions: Set<FloatingPanelPosition> = [.half, .full]
-        }
-
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout2Positions()
-        fpc.delegate = delegate
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-
-        let minPos = CGFloat.leastNormalMagnitude
-        let maxPos = CGFloat.greatestFiniteMagnitude
-
-        assertLayoutSegment(fpc.floatingPanel, with: [
-            (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
-            (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
-            (#line, pos: fullPos, forwardY: true, lower: .full, upper: .half),
-            (#line, pos: fullPos, forwardY: false, lower: nil,  upper: .full),
-            (#line, pos: halfPos, forwardY: true, lower: .half, upper: nil),
-            (#line, pos: halfPos, forwardY: false, lower: .full,  upper: .half),
-            (#line, pos: maxPos, forwardY: true, lower: .half, upper: nil),
-            (#line, pos: maxPos, forwardY: false, lower: .half, upper: nil),
-            ])
-    }
-
-    func test_layoutSegment_1positions() {
-        class FloatingPanelLayout1Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .full
-            let supportedPositions: Set<FloatingPanelPosition> = [.full]
-        }
-
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout1Positions()
-        fpc.delegate = delegate
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-
-        let minPos = CGFloat.leastNormalMagnitude
-        let maxPos = CGFloat.greatestFiniteMagnitude
-
-        assertLayoutSegment(fpc.floatingPanel, with: [
-            (#line, pos: minPos, forwardY: true, lower: nil, upper: .full),
-            (#line, pos: minPos, forwardY: false, lower: nil, upper: .full),
-            (#line, pos: fullPos, forwardY: true, lower: .full, upper: nil),
-            (#line, pos: fullPos, forwardY: false, lower: nil,  upper: .full),
-            (#line, pos: maxPos, forwardY: true, lower: .full, upper: nil),
-            (#line, pos: maxPos, forwardY: false, lower: .full, upper: nil),
-            ])
-    }
-
-    func test_updateInteractiveTopConstraint() {
-        fpc.showForTest()
-        fpc.move(to: .full, animated: false)
-
-        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.position)
-        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.position) // Should be ignore
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-
-        var pre: CGFloat
-        var next: CGFloat
-        pre = fpc.surfaceView.frame.minY
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: -100.0, allowsTopBuffer: false, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, pre)
-
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: -100.0, allowsTopBuffer: true, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, fullPos - fpc.layout.topInteractionBuffer)
-
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: 100.0, allowsTopBuffer: true, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, fullPos + 100.0)
-
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: tipPos - fullPos, allowsTopBuffer: true, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, tipPos)
-
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: tipPos - fullPos + 100.0, allowsTopBuffer: true, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, tipPos + fpc.layout.bottomInteractionBuffer)
-
-        fpc.floatingPanel.layoutAdapter.endInteraction(at: fpc.position)
-    }
-
-    func test_updateInteractiveTopConstraintWithHidden() {
-        class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .hidden
-            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout2Positions()
-        fpc.delegate = delegate
-        fpc.showForTest()
-        fpc.move(to: .full, animated: false)
-
-        fpc.floatingPanel.layoutAdapter.startInteraction(at: fpc.position)
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let hiddenPos = fpc.originYOfSurface(for: .hidden)
-
-        var pre: CGFloat
-        var next: CGFloat
-        pre = fpc.surfaceView.frame.minY
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: -100.0, allowsTopBuffer: false, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, pre)
-
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: -100.0, allowsTopBuffer: true, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, fullPos - fpc.layout.topInteractionBuffer)
-
-        fpc.floatingPanel.layoutAdapter.updateInteractiveTopConstraint(diff: hiddenPos - fullPos + 100.0, allowsTopBuffer: true, with: fpc.behavior)
-        next = fpc.surfaceView.frame.minY
-        XCTAssertEqual(next, hiddenPos + fpc.layout.bottomInteractionBuffer)
-
-        fpc.floatingPanel.layoutAdapter.endInteraction(at: fpc.position)
-    }
-
-    func test_positionReference() {
-        fpc = CustomSafeAreaFloatingPanelController()
-        fpc.loadViewIfNeeded()
-        fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
-
-        class MyFloatingPanelFullLayout: FloatingPanelTestLayout {
-            var initialPosition: FloatingPanelPosition = .half
-            var positionReference: FloatingPanelLayoutReference {
-                return .fromSuperview
-            }
-        }
-        class MyFloatingPanelSafeAreaLayout: FloatingPanelTestLayout {
-            var initialPosition: FloatingPanelPosition = .half
-            var positionReference: FloatingPanelLayoutReference {
-                return .fromSafeArea
-            }
-        }
-        let fullLayout = MyFloatingPanelFullLayout()
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = fullLayout
-        fpc.delegate = delegate
-        fpc.showForTest()
-
-        XCTAssertEqual(fpc.layout.positionReference, .fromSuperview)
-        XCTAssertEqual(fpc.originYOfSurface(for: .full), fullLayout.insetFor(position: .full))
-        XCTAssertEqual(fpc.originYOfSurface(for: .half), fpc.view!.frame.height - fullLayout.insetFor(position: .half)!)
-        XCTAssertEqual(fpc.originYOfSurface(for: .tip), fpc.view!.frame.height - fullLayout.insetFor(position: .tip)!)
-
-        let safeAreaLayout = MyFloatingPanelSafeAreaLayout()
-        delegate.layout = safeAreaLayout
-        fpc.delegate = delegate
-
-        XCTAssertEqual(fpc.layout.positionReference, .fromSafeArea)
-        XCTAssertEqual(fpc.originYOfSurface(for: .full),
-                       fullLayout.insetFor(position: .full)! + fpc.layoutInsets.top)
-        XCTAssertEqual(fpc.originYOfSurface(for: .half),
-                       fpc.view!.frame.height - (fullLayout.insetFor(position: .half)! +  fpc.layoutInsets.bottom))
-        XCTAssertEqual(fpc.originYOfSurface(for: .tip),
-                       fpc.view!.frame.height - (fullLayout.insetFor(position: .tip)! +  fpc.layoutInsets.bottom))
-    }
-}
-
-private typealias LayoutSegmentTestParameter = (UInt, pos: CGFloat, forwardY: Bool, lower: FloatingPanelPosition?, upper: FloatingPanelPosition?)
-private func assertLayoutSegment(_ floatingPanel: FloatingPanelCore, with params: [LayoutSegmentTestParameter]) {
-    params.forEach { (line, pos, forwardY, lowr, upper) in
-        let segument = floatingPanel.layoutAdapter.segument(at: pos, forward: forwardY)
-        XCTAssertEqual(segument.lower, lowr, line: line)
-        XCTAssertEqual(segument.upper, upper, line: line)
-    }
-}
-
-private class CustomSafeAreaFloatingPanelController: FloatingPanelController { }
-extension CustomSafeAreaFloatingPanelController {
-    override var layoutInsets: UIEdgeInsets {
-        return UIEdgeInsets(top: 64.0, left: 0.0, bottom: 0.0, right: 34.0)
-    }
-}
@@ -1,27 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2019/07/05.
-//  Copyright © 2019 scenee. All rights reserved.
-//
-
-import XCTest
-@testable import FloatingPanel
-
-class FloatingPanelPositionTests: XCTestCase {
-    override func setUp() { }
-    override func tearDown() { }
-
-    func test_nextAndPre() {
-        var positions: [FloatingPanelPosition]
-        positions = [.full, .half, .tip, .hidden]
-        XCTAssertEqual(FloatingPanelPosition.full.next(in: positions),  .half)
-        XCTAssertEqual(FloatingPanelPosition.full.pre(in: positions),  .full)
-        XCTAssertEqual(FloatingPanelPosition.hidden.next(in: positions), .hidden)
-        XCTAssertEqual(FloatingPanelPosition.hidden.pre(in: positions), .tip)
-
-        positions = [.full, .hidden]
-        XCTAssertEqual(FloatingPanelPosition.full.next(in: positions),  .hidden)
-        XCTAssertEqual(FloatingPanelPosition.full.pre(in: positions),  .full)
-        XCTAssertEqual(FloatingPanelPosition.hidden.next(in: positions), .hidden)
-        XCTAssertEqual(FloatingPanelPosition.hidden.pre(in: positions), .full)
-    }
-}
@@ -1,118 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2019/05/23.
-//  Copyright © 2019 Shin Yamamoto. All rights reserved.
-//
-
-import XCTest
-@testable import FloatingPanel
-
-class FloatingPanelSurfaceViewTests: XCTestCase {
-    override func setUp() {}
-    override func tearDown() {}
-
-    func test_surfaceView() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        XCTAssertTrue(FloatingPanelSurfaceView.requiresConstraintBasedLayout)
-        XCTAssert(surface.contentView == nil)
-        surface.layoutIfNeeded()
-        XCTAssert(surface.grabberHandle.frame.minY == 6.0)
-        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth)
-        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight)
-        surface.backgroundColor = .red
-        surface.layoutIfNeeded()
-        XCTAssert(surface.backgroundColor == surface.containerView.backgroundColor)
-    }
-
-    func test_surfaceView_grabberHandle() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        XCTAssert(surface.contentView == nil)
-        surface.layoutIfNeeded()
-        XCTAssert(surface.grabberHandle.frame.minY == 6.0)
-        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth)
-        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight)
-
-        surface.grabberHandleWidth = 44.0
-        surface.grabberHandleHeight = 12.0
-        surface.setNeedsLayout()
-        surface.layoutIfNeeded()
-        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth, "\(surface.grabberHandle.frame.width) == \(surface.grabberHandleWidth)")
-        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight, "\(surface.grabberHandle.frame.height) == \(surface.grabberHandleHeight)")
-    }
-
-    func test_surfaceView_containerMargins() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        surface.layoutIfNeeded()
-        XCTAssertEqual(surface.containerView.frame, surface.bounds)
-        surface.containerMargins = UIEdgeInsets(top: 16.0, left: 16.0, bottom: 16.0, right: 16.0)
-        surface.setNeedsLayout()
-        surface.layoutIfNeeded()
-        XCTAssertEqual(surface.containerView.frame, surface.bounds.inset(by: surface.containerMargins))
-    }
-
-    func test_surfaceView_contentInsets() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        let contentView = UIView()
-        surface.add(contentView: contentView)
-        surface.layoutIfNeeded()
-        XCTAssertEqual(surface.contentView.frame, surface.bounds)
-        surface.contentInsets = UIEdgeInsets(top: 16.0, left: 16.0, bottom: 16.0, right: 16.0)
-        surface.setNeedsLayout()
-        surface.layoutIfNeeded()
-        XCTAssertEqual(surface.contentView.frame, surface.bounds.inset(by: surface.contentInsets))
-    }
-
-    func test_surfaceView_containerMargins_and_contentInsets() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        let contentView = UIView()
-        surface.add(contentView: contentView)
-        surface.layoutIfNeeded()
-        XCTAssertEqual(surface.contentView.frame, surface.bounds)
-        surface.containerMargins = UIEdgeInsets(top: 16.0, left: 16.0, bottom: 16.0, right: 16.0)
-        surface.contentInsets = UIEdgeInsets(top: 16.0, left: 16.0, bottom: 16.0, right: 16.0)
-        surface.setNeedsLayout()
-        surface.layoutIfNeeded()
-        XCTAssertEqual(surface.containerView.frame, surface.bounds.inset(by: surface.containerMargins))
-        XCTAssertEqual(surface.contentView.frame, surface.containerView.bounds.inset(by: surface.contentInsets))
-    }
-
-    func test_surfaceView_cornderRaduis() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        XCTAssert(surface.cornerRadius == 0.0)
-        XCTAssert(surface.containerView.layer.masksToBounds == false)
-
-        surface.cornerRadius = 10.0
-        surface.layoutIfNeeded()
-        XCTAssert(surface.cornerRadius == 10.0)
-        XCTAssert(surface.containerView.layer.cornerRadius == 10.0)
-        XCTAssert(surface.containerView.layer.masksToBounds == true)
-
-        surface.containerView.layer.cornerRadius = 12.0
-        surface.layoutIfNeeded()
-        XCTAssert(surface.cornerRadius == 12.0)
-        XCTAssert(surface.containerView.layer.masksToBounds == true)
-
-        surface.cornerRadius = 0.0
-        surface.layoutIfNeeded()
-        XCTAssert(surface.cornerRadius == 0.0)
-        XCTAssert(surface.containerView.layer.cornerRadius == 0.0)
-        XCTAssert(surface.containerView.layer.masksToBounds == false)
-
-        surface.containerView.layer.cornerRadius = 12.0
-        surface.setNeedsLayout()
-        surface.layoutIfNeeded()
-        XCTAssert(surface.cornerRadius == 12.0)
-        XCTAssert(surface.containerView.layer.masksToBounds == true)
-    }
-
-    func test_surfaceView_border() {
-        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
-        XCTAssert(surface.borderColor == nil)
-        XCTAssert(surface.borderWidth == 0.0)
-
-        surface.borderColor = .red
-        surface.borderWidth = 3.0
-        surface.layoutIfNeeded()
-        XCTAssert(surface.containerView.layer.borderColor == UIColor.red.cgColor)
-        XCTAssert(surface.containerView.layer.borderWidth == 3.0)
-    }
-}
@@ -4,534 +4,11 @@
 //

 import XCTest
-@testable import FloatingPanel

 class FloatingPanelTests: XCTestCase {
+
    override func setUp() {}
+
    override func tearDown() {}

-    func test_scrolllock() {
-        let fpc = FloatingPanelController()
-
-        let contentVC1 = UITableViewController(nibName: nil, bundle: nil)
-        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, true)
-        XCTAssertEqual(contentVC1.tableView.bounces, true)
-        fpc.set(contentViewController: contentVC1)
-        fpc.track(scrollView: contentVC1.tableView)
-        fpc.showForTest()
-
-        XCTAssertEqual(fpc.position, .half)
-        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, false)
-        XCTAssertEqual(contentVC1.tableView.bounces, false)
-
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, true)
-        XCTAssertEqual(contentVC1.tableView.bounces, true)
-
-        fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, false)
-        XCTAssertEqual(contentVC1.tableView.bounces, false)
-
-        let exp1 = expectation(description: "move to full with animation")
-        fpc.move(to: .full, animated: true) {
-            XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, true)
-            XCTAssertEqual(contentVC1.tableView.bounces, true)
-            exp1.fulfill()
-        }
-        wait(for: [exp1], timeout: 1.0)
-
-        let exp2 = expectation(description: "move to tip with animation")
-        fpc.move(to: .tip, animated: false) {
-            XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, false)
-            XCTAssertEqual(contentVC1.tableView.bounces, false)
-            exp2.fulfill()
-        }
-        wait(for: [exp2], timeout: 1.0)
-
-        // Reset the content vc
-        let contentVC2 = UITableViewController(nibName: nil, bundle: nil)
-        XCTAssertEqual(contentVC2.tableView.showsVerticalScrollIndicator, true)
-        XCTAssertEqual(contentVC2.tableView.bounces, true)
-        fpc.set(contentViewController: contentVC2)
-        fpc.track(scrollView: contentVC2.tableView)
-        fpc.show(animated: false, completion: nil)
-        XCTAssertEqual(fpc.position, .half)
-        XCTAssertEqual(contentVC2.tableView.showsVerticalScrollIndicator, false)
-        XCTAssertEqual(contentVC2.tableView.bounces, false)
-    }
-
-    func test_getBackdropAlpha_1positions() {
-        class FloatingPanelLayout1Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .full
-            let supportedPositions: Set<FloatingPanelPosition> = [.full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout1Positions()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos - 100.0, with: CGPoint(x: 0.0, y: -100.0)), 0.3)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: CGPoint(x: 0.0, y: 0.0)), 0.3)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos + 100.0, with: CGPoint(x: 0.0, y: 100.0)), 0.3) // ok??
-    }
-
-    func test_getBackdropAlpha_2positions() {
-        class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .half
-            let supportedPositions: Set<FloatingPanelPosition> = [.half, .full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout2Positions()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let distance1 = abs(halfPos - fullPos)
-
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: CGPoint(x: 0.0, y: 0.0)), 0.3)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos + distance1 * 0.5, with: CGPoint(x: 0.0, y: distance1 * 0.5)), 0.3 * 0.5)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos, with: CGPoint(x: 0.0, y: distance1)), 0.0)
-
-        fpc.move(to: .half, animated: false)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos, with: CGPoint(x: 0.0, y: 0.0)), 0.0)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos + distance1 * 0.5, with: CGPoint(x: 0.0, y: -0.5 * distance1)), 0.3 * 0.5)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: CGPoint(x: 0.0, y: -1 * distance1)), 0.3)
-    }
-
-    func test_getBackdropAlpha_2positionsWithHidden() {
-        class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .hidden
-            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout2Positions()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let hiddenPos = fpc.originYOfSurface(for: .hidden)
-
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos - 100.0, with: CGPoint(x: 0.0, y: -100.0)), 0.3)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: CGPoint(x: 0.0, y: 0.0)), 0.3)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: hiddenPos, with: CGPoint(x: 0.0, y: 100.0)), 0.0)
-    }
-
-    func test_getBackdropAlpha_3positions() {
-        let fpc = FloatingPanelController()
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-        let distance1 = abs(halfPos - fullPos)
-        let distance2 = abs(tipPos - halfPos)
-
-        fpc.move(to: .full, animated: false)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: CGPoint(x: 0.0, y: 0.0)), 0.3)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos + distance1 * 0.5, with: CGPoint(x: 0.0, y: distance1 * 0.5)), 0.3 * 0.5)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos, with: CGPoint(x: 0.0, y: distance1)), 0.0)
-
-        fpc.move(to: .half, animated: false)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos, with: CGPoint(x: 0.0, y: 0.0)), 0.0)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos + distance1 * 0.5, with: CGPoint(x: 0.0, y: -0.5 * distance1)), 0.3 * 0.5)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: fullPos, with: CGPoint(x: 0.0, y: -1 * distance1)), 0.3)
-
-        fpc.move(to: .tip, animated: false)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: tipPos, with: CGPoint(x: 0.0, y: 0.0)), 0.0)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos + distance2 * 0.5, with: CGPoint(x: 0.0, y: -0.5 * distance2)), 0.0)
-        XCTAssertEqual(fpc.floatingPanel.getBackdropAlpha(at: halfPos, with: CGPoint(x: 0.0, y: -1 * distance2)), 0.0)
-    }
-
-    func test_targetPosition_1positions() {
-        class FloatingPanelLayout1Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .full
-            let supportedPositions: Set<FloatingPanelPosition> = [.full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout1Positions()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-
-        fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .full), // redirect
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            ])
-    }
-
-    func test_targetPosition_2positions() {
-        class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .half
-            let supportedPositions: Set<FloatingPanelPosition> = [.half, .full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout2Positions()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-
-        fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .half), // redirect
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
-            ])
-        fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // project to half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .half), // redirect
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
-            ])
-    }
-
-    func test_targetPosition_2positionsWithHidden() {
-        class FloatingPanelLayout2Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .hidden
-            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout2Positions()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let hiddenPos = fpc.originYOfSurface(for: .hidden)
-
-        fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, hiddenPos - 10.0, CGPoint(x: 0.0, y: -100.0), .hidden), // redirect
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 0.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // redirect
-            (#line, hiddenPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
-            ])
-        fpc.move(to: .hidden, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos, CGPoint(x: 0.0, y: -1000.0), .full), // redirect
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // project to hidden
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, hiddenPos - 10.0, CGPoint(x: 0.0, y: -100.0), .hidden), // redirect
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -1000.0), .full),  // project to full
-            (#line, hiddenPos, CGPoint(x: 0.0, y: -100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 0.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 100.0), .hidden),
-            (#line, hiddenPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // redirect
-            (#line, hiddenPos + 10.0, CGPoint(x: 0.0, y: -1000.0), .full), // project to full
-            ])
-    }
-
-    func test_targetPosition_2positionsFromFull() {
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3Positions()
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-        // From .full
-        fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from topMostState
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full), //project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip), // project to tip
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirect
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from bottomMostState
-            ])
-    }
-
-    func test_targetPosition_3positionsFromHalf() {
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3Positions()
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-        // From .half
-        fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from topMostState
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),// project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip), // project to tip
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirect
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from bottomMostState
-            ])
-    }
-
-    func test_targetPosition_3positionsFromTip() {
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3Positions()
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-
-        // From .tip
-        fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: -100.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 0.0), .full), // far from topMostState
-            (#line, fullPos - 500.0, CGPoint(x: 0.0, y: 100.0), .full), // far from topMostState
-            (#line, fullPos, CGPoint(x: 0.0, y: -100.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 0.0), .full),
-            (#line, fullPos, CGPoint(x: 0.0, y: 500.0), .half), // project to half
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .half), // block projecting to tip at half
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .half), // block projecting to tip at half
-            (#line, fullPos + 10.0, CGPoint(x: 0.0, y: 100.0), .full), // redirect
-            (#line, halfPos - 10.0, CGPoint(x: 0.0, y: -100.0), .half), // redirect
-            (#line, halfPos, CGPoint(x: 0.0, y: -3000.0), .full), // project to full
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip), // project to tip
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirect
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirect
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half), // block projecting to full at half
-            (#line, tipPos, CGPoint(x: 0.0, y: -500.0), .half), // project to half
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 100.0), .tip),
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: -100.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 0.0), .tip), // far from bottomMostState
-            (#line, tipPos + 500.0, CGPoint(x: 0.0, y: 100.0), .tip), // far from bottomMostState
-            ])
-    }
-
-    func test_targetPosition_3positionsAllProjection() {
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3Positions()
-        delegate.behavior = FloatingPanelProjectionalBehavior()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-
-        let fullPos = fpc.originYOfSurface(for: .full)
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-
-        // From .full
-        fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .full),
-            ])
-
-        // From .half
-        fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            ])
-
-        // From .tip
-        fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fullPos - 10.0, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, fullPos, CGPoint(x: 0.0, y: 3000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .tip),
-            (#line, halfPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .full),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: -3000.0), .full),
-            ])
-    }
-
-    func test_targetPosition_3positionsWithHidden() {
-        class FloatingPanelLayout3PositionsWithHidden: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .hidden
-            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .half, .full]
-        }
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3PositionsWithHidden()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-        XCTAssertEqual(fpc.position, .hidden)
-
-        fpc.move(to: .full, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 1000.0), .half),
-            ])
-        fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: -1000.0), .full),
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, fpc.surfaceView.frame.minY, CGPoint(x: 0.0, y: 1000.0), .hidden),
-            ])
-    }
-
-    func test_targetPosition_3positionsWithHiddenWithoutFull() {
-        class FloatingPanelLayout3Positions: FloatingPanelTestLayout {
-            let initialPosition: FloatingPanelPosition = .hidden
-            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .tip, .half]
-        }
-
-        let delegate = FloatingPanelTestDelegate()
-        delegate.layout = FloatingPanelLayout3Positions()
-        delegate.behavior = FloatingPanelProjectionalBehavior()
-
-        let fpc = FloatingPanelController(delegate: delegate)
-        fpc.showForTest()
-        XCTAssertEqual(fpc.position, .hidden)
-
-        let halfPos = fpc.originYOfSurface(for: .half)
-        let tipPos = fpc.originYOfSurface(for: .tip)
-        //let hiddenPos = fpc.originYOfSurface(for: .hidden)
-
-        fpc.move(to: .half, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, halfPos, CGPoint(x: 0.0, y: -100.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 0.0), .half),
-            (#line, halfPos, CGPoint(x: 0.0, y: 385.0), .tip), // projection
-            (#line, halfPos, CGPoint(x: 0.0, y: 1000.0), .hidden), // projection
-            (#line, halfPos + 10.0, CGPoint(x: 0.0, y: 100.0), .half), // redirection
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: -100.0), .tip), // redirection
-            (#line, tipPos, CGPoint(x: 0.0, y: -3000.0), .half), //projection
-            (#line, tipPos, CGPoint(x: 0.0, y: -10.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 10.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .hidden), //projection
-            (#line, tipPos + 10.0, CGPoint(x: 0.0, y: 10.0), .tip), // redirection
-            (#line, tipPos - 10.0, CGPoint(x: 0.0, y: 10.0), .tip), // redirection
-            ])
-        fpc.move(to: .tip, animated: false)
-        assertTargetPosition(fpc.floatingPanel, with: [
-            (#line, tipPos, CGPoint(x: 0.0, y: -100.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: -1000.0), .half),
-            (#line, tipPos, CGPoint(x: 0.0, y: 0.0), .tip),
-            (#line, tipPos, CGPoint(x: 0.0, y: 1000.0), .hidden),
-            ])
-    }
-}
-
-private class FloatingPanelLayout3Positions: FloatingPanelTestLayout {
-    let initialPosition: FloatingPanelPosition = .tip
-    let supportedPositions: Set<FloatingPanelPosition> = [.tip, .half, .full]
-}
-
-private typealias TestParameter = (UInt, CGFloat,CGPoint, FloatingPanelPosition)
-private func assertTargetPosition(_ floatingPanel: FloatingPanelCore, with params: [TestParameter]) {
-    params.forEach { (line, pos, velocity, result) in
-        floatingPanel.surfaceView.frame.origin.y = pos
-        XCTAssertEqual(floatingPanel.targetPosition(from: pos, with: velocity), result, line: line)
-    }
-}
-
-private class FloatingPanelProjectionalBehavior: FloatingPanelBehavior {
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, for proposedTargetPosition: FloatingPanelPosition) -> Bool {
-        return true
-    }
 }
@@ -0,0 +1,67 @@
+//
+//  Created by Shin Yamamoto on 2019/05/23.
+//  Copyright © 2019 Shin Yamamoto. All rights reserved.
+//
+
+import XCTest
+@testable import FloatingPanel
+
+class FloatingPanelViewTests: XCTestCase {
+
+    override func setUp() {}
+
+    override func tearDown() {}
+
+    func test_surfaceView() {
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        XCTAssert(surface.contentView == nil)
+        surface.layoutIfNeeded()
+        XCTAssert(surface.grabberHandle.frame.minY == 6.0)
+        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth)
+        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight)
+        surface.backgroundColor = .red
+        surface.layoutIfNeeded()
+        XCTAssert(surface.backgroundColor == surface.containerView.backgroundColor)
+    }
+
+    func test_surfaceView_cornderRaduis() {
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        XCTAssert(surface.cornerRadius == 0.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == false)
+
+        surface.cornerRadius = 10.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 10.0)
+        XCTAssert(surface.containerView.layer.cornerRadius == 10.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == true)
+
+        surface.containerView.layer.cornerRadius = 12.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 12.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == true)
+
+        surface.cornerRadius = 0.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 0.0)
+        XCTAssert(surface.containerView.layer.cornerRadius == 0.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == false)
+
+        surface.containerView.layer.cornerRadius = 12.0
+        surface.setNeedsLayout()
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 12.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == true)
+    }
+
+    func test_surfaceView_border() {
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        XCTAssert(surface.borderColor == nil)
+        XCTAssert(surface.borderWidth == 0.0)
+
+        surface.borderColor = .red
+        surface.borderWidth = 3.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.containerView.layer.borderColor == UIColor.red.cgColor)
+        XCTAssert(surface.containerView.layer.borderWidth == 3.0)
+    }
+}
@@ -1,46 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2019/06/27.
-//  Copyright © 2019 scenee. All rights reserved.
-//
-
-import Foundation
-@testable import FloatingPanel
-
-func waitRunLoop(secs: TimeInterval = 0) {
-    RunLoop.main.run(until: Date(timeIntervalSinceNow: secs))
-}
-
-extension FloatingPanelController {
-    func showForTest() {
-        loadViewIfNeeded()
-        view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
-        show(animated: false, completion: nil)
-    }
-}
-
-class FloatingPanelTestDelegate: FloatingPanelControllerDelegate {
-    var layout: FloatingPanelLayout?
-    var behavior: FloatingPanelBehavior?
-    var position: FloatingPanelPosition = .hidden
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
-        return layout
-    }
-    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
-        return behavior
-    }
-    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) {
-        position = vc.position
-    }
-}
-
-protocol FloatingPanelTestLayout: FloatingPanelFullScreenLayout {}
-extension FloatingPanelTestLayout {
-    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
-        switch position {
-        case .full: return 20.0
-        case .half: return 250.0
-        case .tip: return 60.0
-        default: return nil
-        }
-    }
-}
@@ -1,27 +0,0 @@
-// swift-tools-version:5.0
-// The swift-tools-version declares the minimum version of Swift required to build this package.
-
-import PackageDescription
-
-let package = Package(
-    name: "FloatingPanel",
-    platforms: [
-        .iOS(.v10)
-    ],
-    products: [
-        // Products define the executables and libraries produced by a package, and make them visible to other packages.
-        .library(
-            name: "FloatingPanel",
-            targets: ["FloatingPanel"]),
-    ],
-    dependencies: [
-        // Dependencies declare other packages that this package depends on.
-        // .package(url: /* package url */, from: "1.0.0"),
-    ],
-    targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
-        .target(name: "FloatingPanel", path: "Framework/Sources"),
-    ],
-    swiftLanguageVersions: [.version("5")]
-)
@@ -5,9 +5,9 @@
 [![Swift 4.1](https://img.shields.io/badge/Swift-4.1-orange.svg?style=flat)](https://swift.org/)
 [![Swift 4.2](https://img.shields.io/badge/Swift-4.2-orange.svg?style=flat)](https://swift.org/)
 [![Swift 5.0](https://img.shields.io/badge/Swift-5.0-orange.svg?style=flat)](https://swift.org/)
-[![Swift 5.1](https://img.shields.io/badge/Swift-5.1-orange.svg?style=flat)](https://swift.org/)

-# FloatingPanel
+#  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.
@@ -24,37 +24,25 @@ The new interface displays the related contents and utilities in parallel as a u
 - [Installation](#installation)
  - [CocoaPods](#cocoapods)
  - [Carthage](#carthage)
-  - [Swift Package Manager with Xcode 11](#swift-package-manager-with-xcode-11)
 - [Getting Started](#getting-started)
  - [Add a floating panel as a child view controller](#add-a-floating-panel-as-a-child-view-controller)
  - [Present a floating panel as a modality](#present-a-floating-panel-as-a-modality)
 - [View hierarchy](#view-hierarchy)
 - [Usage](#usage)
  - [Show/Hide a floating panel in a view with your view hierarchy](#showhide-a-floating-panel-in-a-view-with-your-view-hierarchy)
-  - [Scale the content view when the surface position changes](#scale-the-content-view-when-the-surface-position-changes)
  - [Customize the layout with `FloatingPanelLayout` protocol](#customize-the-layout-with-floatingpanellayout-protocol)
    - [Change the initial position and height](#change-the-initial-position-and-height)
    - [Support your landscape layout](#support-your-landscape-layout)
    - [Use Intrinsic height layout](#use-intrinsic-height-layout)
-    - [Specify position insets from the frame of `FloatingPanelContrller.view`, not the SafeArea](#specify-position-insets-from-the-frame-of-floatingpanelcontrllerview-not-the-safearea)
  - [Customize the behavior with `FloatingPanelBehavior` protocol](#customize-the-behavior-with-floatingpanelbehavior-protocol)
    - [Modify your floating panel's interaction](#modify-your-floating-panels-interaction)
-    - [Activate the rubber-band effect on the top/bottom edges](#activate-the-rubber-band-effect-on-the-topbottom-edges)
-    - [Manage the projection of a pan gesture momentum](#manage-the-projection-of-a-pan-gesture-momentum)
-  - [Customize the surface design](#customize-the-surface-design)
-    - [Use a custom grabber handle](#use-a-custom-grabber-handle)
-    - [Customize layout of the grabber handle](#customize-layout-of-the-grabber-handle)
-    - [Customize content padding from surface edges](#customize-content-padding-from-surface-edges)
-    - [Customize margins of the surface edges](#customize-margins-of-the-surface-edges)
-  - [Customize gestures](#customize-gestures)
-    - [Suppress the panel interaction](#suppress-the-panel-interaction)
-    - [Add tap gestures to the surface or backdrop views](#add-tap-gestures-to-the-surface-or-backdrop-views)
+  - [Use a custom grabber handle](#use-a-custom-grabber-handle)
+  - [Add tap gestures to the surface or backdrop views](#add-tap-gestures-to-the-surface-or-backdrop-views)
  - [Create an additional floating panel for a detail](#create-an-additional-floating-panel-for-a-detail)
  - [Move a position with an animation](#move-a-position-with-an-animation)
  - [Work your contents together with a floating panel behavior](#work-your-contents-together-with-a-floating-panel-behavior)
 - [Notes](#notes)
  - ['Show' or 'Show Detail' Segues from `FloatingPanelController`'s content view controller](#show-or-show-detail-segues-from-floatingpanelcontrollers-content-view-controller)
-  - [UISearchController issue](#uisearchcontroller-issue)
  - [FloatingPanelSurfaceView's issue on iOS 10](#floatingpanelsurfaceviews-issue-on-ios-10)
 - [Author](#author)
 - [License](#license)
@@ -95,7 +83,7 @@ it, simply add the following line to your Podfile:
 pod 'FloatingPanel'
 ```

-✏️FloatingPanel v1.7.0 or later requires CocoaPods v1.7.0+ for `swift_versions` support.
+✏️ To suppress "Swift Conversion" warnings in Xcode, please set a Swift version to `SWIFT_VERSION` for the project in your Podfile. It will be resolved in CocoaPods v1.7.0.

 ### Carthage

@@ -105,10 +93,6 @@ For [Carthage](https://github.com/Carthage/Carthage), add the following to your
 github "scenee/FloatingPanel"
 ```

-### Swift Package Manager with Xcode 11
-
-Follow [this doc](https://developer.apple.com/documentation/swift_packages/adding_package_dependencies_to_your_app).
-
 ## Getting Started

 ### Add a floating panel as a child view controller
@@ -181,72 +165,41 @@ FloatingPanelController.view (FloatingPanelPassThroughView)

 ### Show/Hide a floating panel in a view with your view hierarchy

-If you need more control over showing and hiding the floating panel, you can forgo the `addPanel` and `removePanelFromParent` methods. These methods are a convenience wrapper for **FloatingPanel**'s `show` and `hide` methods along with some required setup.
-
-There are two ways to work with the `FloatingPanelController`:
-1. Add it to the hierarchy once and then call `show` and `hide` methods to make it appear/disappear.
-2. Add it to the hierarchy when needed and remove afterwards.
-
-The following example shows how to add the controller to your `UIViewController` and how to remove it. Make sure that you never add the same `FloatingPanelController` to the hierarchy before removing it.
-
-**NOTE**: `self.` prefix is not required, nor recommended. It's used here to make it clearer where do the functions used come from. `self` is an instance of a custom UIViewController in your code.
-
 ```swift
-// Add the floating panel view to the controller's view on top of other views.
-self.view.addSubview(fpc.view)
-
-// REQUIRED. It makes the floating panel view have the same size as the controller's view.
-fpc.view.frame = self.view.bounds
+// Add the controller and the managed views to a view controller.
+// From the second time, just call `show(animated:completion)`.
+view.addSubview(fpc.view)

+fpc.view.frame = view.bounds // MUST
 // In addition, Auto Layout constraints are highly recommended.
-// Constraint the fpc.view to all four edges of your controller's view.
-// It makes the layout more robust on trait collection change.
-fpc.view.translatesAutoresizingMaskIntoConstraints = false
-NSLayoutConstraint.activate([
-  fpc.view.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0.0),
-  fpc.view.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 0.0),
-  fpc.view.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: 0.0),
-  fpc.view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0.0),
-])
+// Because it makes the layout more robust on trait collection change.
+//
+//     fpc.view.translatesAutoresizingMaskIntoConstraints = false
+//     NSLayoutConstraint.activate([...])
+// 

-// Add the floating panel controller to the controller hierarchy.
-self.addChild(fpc)
+parent.addChild(fpc)

-// Show the floating panel at the initial position defined in your `FloatingPanelLayout` object.
+// Show a floating panel to the initial position defined in your `FloatingPanelLayout` object.
 fpc.show(animated: true) {
-    // Inform the floating panel controller that the transition to the controller hierarchy has completed.
-    fpc.didMove(toParent: self)
+
+    // Only for the first time
+    self.didMove(toParent: self)
 }
-```

-After you add the `FloatingPanelController` as seen above, you can call `fpc.show(animated: true) { }` to show the panel and `fpc.hide(animated: true) { }` to hide it.
+...

-To remove the `FloatingPanelController` from the hierarchy, follow the example below.
-
-```swift
-// Inform the panel controller that it will be removed from the hierarchy.
-fpc.willMove(toParent: nil)
-    
-// Hide the floating panel.
+// Hide it
 fpc.hide(animated: true) {
-    // Remove the floating panel view from your controller's view.
-    fpc.view.removeFromSuperview()
-    // Remove the floating panel controller from the controller hierarchy.
-    fpc.removeFromParent()
+
+    // Remove it if needed
+    self.willMove(toParent: nil)
+    self.view.removeFromSuperview()
+    self.removeFromParent()
 }
 ```

-### Scale the content view when the surface position changes
-
-Specify the `contentMode` to `.fitToBounds` if the surface height fits the bounds of `FloatingPanelController.view` when the surface position changes
-
-```swift
-fpc.contentMode = .fitToBounds
-```
-
-Otherwise, `FloatingPanelController` fixes the content by the height of the top most position.
-
-✏️ In `.fitToBounds` mode, the surface height changes as following a user interaction so that you have a responsibility to configure Auto Layout constrains not to break the layout of a content view by the elastic surface height.
+NOTE: `FloatingPanelController` wraps `show`/`hide` with `addPanel`/`removePanelFromParent` for easy-to-use. But `show`/`hide` are more convenience for your app.

 ### Customize the layout with `FloatingPanelLayout` protocol

@@ -338,27 +291,6 @@ class RemovablePanelLayout: FloatingPanelIntrinsicLayout {
 }
 ```

-#### Specify position insets from the frame of `FloatingPanelContrller.view`, not the SafeArea
-
-There are 2 ways. One is returning `.fromSuperview` for `FloatingPanelLayout.positionReference` in your layout.
-
-```swift
-class MyFullScreenLayout: FloatingPanelLayout {
-    ...
-    var positionReference: FloatingPanelLayoutReference {
-        return .fromSuperview
-    }
-}
-```
-
-Another is using `FloatingPanelFullScreenLayout` protocol.
-
-```swift
-class MyFullScreenLayout: FloatingPanelFullScreenLayout {
-    ...
-}
-```
-
 ### Customize the behavior with `FloatingPanelBehavior` protocol

 #### Modify your floating panel's interaction
@@ -381,33 +313,7 @@ class FloatingPanelStocksBehavior: FloatingPanelBehavior {
 }
 ```

-#### Activate the rubber-band effect on the top/bottom edges
-
-```swift
-class FloatingPanelBehavior: FloatingPanelBehavior {
-    ...
-    func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
-        return true
-    }
-}
-```
-
-#### Manage the projection of a pan gesture momentum
-
-This allows full projectional panel behavior. For example, a user can swipe up a panel from tip to full nearby the tip position.
-
-```swift
-class FloatingPanelBehavior: FloatingPanelBehavior {
-    ...
-    func shouldProjectMomentum(_ fpc: FloatingPanelController, for proposedTargetPosition: FloatingPanelPosition) -> Bool {
-        return true
-    }
-}
-```
-
-### Customize the surface design
-
-#### Use a custom grabber handle
+### Use a custom grabber handle

 ```swift
 let myGrabberHandleView = MyGrabberHandleView()
@@ -415,50 +321,7 @@ fpc.surfaceView.grabberHandle.isHidden = true
 fpc.surfaceView.addSubview(myGrabberHandleView)
 ```

-#### Customize layout of the grabber handle
-
-```swift
-fpc.surfaceView.grabberTopPadding = 10.0
-fpc.surfaceView.grabberHandleWidth = 44.0
-fpc.surfaceView.grabberHandleHeight = 12.0
-```
-
-#### Customize content padding from surface edges
-
-```swift
-fpc.surfaceView.contentInsets = .init(top: 20, left: 20, bottom: 20, right: 20)
-```
-
-#### Customize margins of the surface edges
-
-```swift
-fpc.surfaceView.containerMargins = .init(top: 20.0, left: 16.0, bottom: 16.0, right: 16.0)
-```
-
-The feature can be used for these 2 kind panels
-
-* Facebook/Slack-like panel whose surface top edge is separated from the grabber handle.
-* iOS native panel to display AirPods information, for example.
-
-### Customize gestures
-
-#### Suppress the panel interaction
-
-You can disable the pan gesture recognizer directly
-
-```swift
-fpc.panGestureRecognizer.isEnable = false
-```
-
-Or use this `FloatingPanelControllerDelegate` method.
-
-```swift
-func floatingPanelShouldBeginDragging(_ vc: FloatingPanelController) -> Bool {
-    return aCondition ?  false : true
-}
-```
-
-#### Add tap gestures to the surface or backdrop views
+### Add tap gestures to the surface or backdrop views

 ```swift
 override func viewDidLoad() {
@@ -572,12 +435,6 @@ A `FloatingPanelController` object proxies an action for `show(_:sender)` to the

 It's a great way to decouple between a floating panel and the content VC.

-### UISearchController issue
-
-`UISearchController` isn't able to be used with `FloatingPanelController` by the system design.
-
-Because `UISearchController` automatically presents itself modally when a user interacts with the search bar, and then it swaps the superview of the search bar to the view managed by itself while it displays. As a result, `FloatingPanelController` can't control the search bar when it's active, as you can see from [the screen shot](https://github.com/SCENEE/FloatingPanel/issues/248#issuecomment-521263831).
-
 ### FloatingPanelSurfaceView's issue on iOS 10

 * On iOS 10, `FloatingPanelSurfaceView.cornerRadius` isn't not automatically masked with the top rounded corners  because of `UIVisualEffectView` issue. See https://forums.developer.apple.com/thread/50854.
Author	SHA1	Message	Date
Shin Yamamoto	837edc6abf	Update sample	2019-06-01 23:36:20 +09:00
Shin Yamamoto	20fda3888f	GrabberHandleView supports UIAppearance	2019-06-01 23:36:20 +09:00
Shin Yamamoto	4728c6848b	FloatingPanelBackdropView supports UIAppearance	2019-06-01 23:36:20 +09:00
Shin Yamamoto	70c945c9f5	FloatingPanelSurfaceView supports UIAppearance	2019-06-01 23:36:20 +09:00