From 00ce2324206618af11cc5f2eb13c8cd7a683d647 Mon Sep 17 00:00:00 2001
From: Shin Yamamoto <shin@scenee.com>
Date: Sat, 8 May 2021 13:17:02 +0900
Subject: [PATCH] Refactor the samples app (#459)

* Add UseCaseController
* Add Layouts.swift
* Add PagePanelController
* Append access modifiers into some objects
* Split view controllers into each file
* Organize the project
* Rename currentMenu with currentUseCase
* Rename SampleListVC with MainVC
* Update UseCase enum
* Update DebugTableViewController to test the scroll (un)tracking functions
---
 .../Samples/Samples.xcodeproj/project.pbxproj |   86 +-
 .../Sources/Base.lproj/Main.storyboard        |   75 +-
 .../{UIComponents.swift => Components.swift}  |    6 +-
 Examples/Samples/Sources/Layouts.swift        |   90 ++
 .../Samples/Sources/MainViewController.swift  |   93 ++
 .../Samples/Sources/UseCaseController.swift   |  329 +++++
 .../UseCases/PagePanelController.swift        |   82 +
 .../{UseCases.swift => UseCase.swift}         |   20 +-
 Examples/Samples/Sources/ViewController.swift | 1313 -----------------
 .../DebugTableViewController.swift            |  272 ++++
 .../DebugTextViewController.swift             |   44 +
 .../DetailViewController.swift                |   39 +
 .../ViewControllers/ImageViewController.swift |   69 +
 .../InspectorViewController.swift             |   48 +
 .../ViewControllers/ModalViewController.swift |   79 +
 .../MultiPanelController.swift                |   67 +
 .../NestedScrollViewController.swift          |   18 +
 .../SettingsViewController.swift              |   36 +
 .../TabBarViewController.swift                |  248 ++++
 19 files changed, 1634 insertions(+), 1380 deletions(-)
 rename Examples/Samples/Sources/{UIComponents.swift => Components.swift} (96%)
 create mode 100644 Examples/Samples/Sources/Layouts.swift
 create mode 100644 Examples/Samples/Sources/MainViewController.swift
 create mode 100644 Examples/Samples/Sources/UseCaseController.swift
 create mode 100644 Examples/Samples/Sources/UseCases/PagePanelController.swift
 rename Examples/Samples/Sources/UseCases/{UseCases.swift => UseCase.swift} (81%)
 delete mode 100644 Examples/Samples/Sources/ViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/DebugTableViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/DebugTextViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/DetailViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/ImageViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/InspectorViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/ModalViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/MultiPanelController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/NestedScrollViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/SettingsViewController.swift
 create mode 100644 Examples/Samples/Sources/ViewControllers/TabBarViewController.swift

diff --git a/Examples/Samples/Samples.xcodeproj/project.pbxproj b/Examples/Samples/Samples.xcodeproj/project.pbxproj
index 1c82edd..cf83eb3 100644
--- a/Examples/Samples/Samples.xcodeproj/project.pbxproj
+++ b/Examples/Samples/Samples.xcodeproj/project.pbxproj
@@ -7,19 +7,32 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		5442E22425FC51AF00A26F43 /* ImageViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22325FC51AF00A26F43 /* ImageViewController.swift */; };
+		5442E22825FC51E200A26F43 /* MultiPanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22725FC51E200A26F43 /* MultiPanelController.swift */; };
+		5442E22C25FC521F00A26F43 /* SettingsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22B25FC521F00A26F43 /* SettingsViewController.swift */; };
+		5442E23025FC525200A26F43 /* TabBarViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E22F25FC525200A26F43 /* TabBarViewController.swift */; };
+		5442E23425FC528400A26F43 /* DetailViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E23325FC528400A26F43 /* DetailViewController.swift */; };
+		5442E23A25FC52CD00A26F43 /* ModalViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E23925FC52CD00A26F43 /* ModalViewController.swift */; };
+		5442E24025FC533800A26F43 /* DebugTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E23F25FC533800A26F43 /* DebugTableViewController.swift */; };
+		5442E24425FC538200A26F43 /* InspectorViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E24325FC538200A26F43 /* InspectorViewController.swift */; };
+		5442E24A25FC53C100A26F43 /* DebugTextViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E24925FC53C100A26F43 /* DebugTextViewController.swift */; };
+		5442E25225FC541700A26F43 /* NestedScrollViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5442E25125FC541700A26F43 /* NestedScrollViewController.swift */; };
+		54496C59263A7E5A0031E0C8 /* UseCaseController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54496C58263A7E5A0031E0C8 /* UseCaseController.swift */; };
 		545DB9EE21511E6300CA77B8 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9ED21511E6300CA77B8 /* AppDelegate.swift */; };
-		545DB9F021511E6300CA77B8 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9EF21511E6300CA77B8 /* ViewController.swift */; };
+		545DB9F021511E6300CA77B8 /* MainViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9EF21511E6300CA77B8 /* MainViewController.swift */; };
 		545DB9F321511E6300CA77B8 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F121511E6300CA77B8 /* Main.storyboard */; };
 		545DB9F521511E6400CA77B8 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F421511E6400CA77B8 /* Assets.xcassets */; };
 		545DB9F821511E6400CA77B8 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 545DB9F621511E6400CA77B8 /* LaunchScreen.storyboard */; };
 		545DBA0321511E6400CA77B8 /* SampleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0221511E6400CA77B8 /* SampleTests.swift */; };
 		545DBA0E21511E6400CA77B8 /* SampleUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA0D21511E6400CA77B8 /* SampleUITests.swift */; };
-		546341A125C6415100CA0596 /* UseCases.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341A025C6415100CA0596 /* UseCases.swift */; };
+		546341A125C6415100CA0596 /* UseCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341A025C6415100CA0596 /* UseCase.swift */; };
 		546341AC25C6426500CA0596 /* CustomState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 546341AB25C6426500CA0596 /* CustomState.swift */; };
 		549D23CB233C7779008EF4D7 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; };
 		549D23CC233C7779008EF4D7 /* FloatingPanel.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 549D23CA233C7779008EF4D7 /* FloatingPanel.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		54B51116216AFE5F0033A6F3 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B51115216AFE5F0033A6F3 /* Extensions.swift */; };
-		54CDC5D8215BBE23007D205C /* UIComponents.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D7215BBE23007D205C /* UIComponents.swift */; };
+		54CDC5D8215BBE23007D205C /* Components.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D7215BBE23007D205C /* Components.swift */; };
+		54EAD35B263A75EB006A36EA /* Layouts.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54EAD35A263A75EB006A36EA /* Layouts.swift */; };
+		54EAD365263A765F006A36EA /* PagePanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54EAD364263A765F006A36EA /* PagePanelController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -54,9 +67,20 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		5442E22325FC51AF00A26F43 /* ImageViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageViewController.swift; sourceTree = "<group>"; };
+		5442E22725FC51E200A26F43 /* MultiPanelController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MultiPanelController.swift; sourceTree = "<group>"; };
+		5442E22B25FC521F00A26F43 /* SettingsViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsViewController.swift; sourceTree = "<group>"; };
+		5442E22F25FC525200A26F43 /* TabBarViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TabBarViewController.swift; sourceTree = "<group>"; };
+		5442E23325FC528400A26F43 /* DetailViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DetailViewController.swift; sourceTree = "<group>"; };
+		5442E23925FC52CD00A26F43 /* ModalViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ModalViewController.swift; sourceTree = "<group>"; };
+		5442E23F25FC533800A26F43 /* DebugTableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DebugTableViewController.swift; sourceTree = "<group>"; };
+		5442E24325FC538200A26F43 /* InspectorViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InspectorViewController.swift; sourceTree = "<group>"; };
+		5442E24925FC53C100A26F43 /* DebugTextViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DebugTextViewController.swift; sourceTree = "<group>"; };
+		5442E25125FC541700A26F43 /* NestedScrollViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NestedScrollViewController.swift; sourceTree = "<group>"; };
+		54496C58263A7E5A0031E0C8 /* UseCaseController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCaseController.swift; sourceTree = "<group>"; };
 		545DB9EA21511E6300CA77B8 /* Samples.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Samples.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		545DB9ED21511E6300CA77B8 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
-		545DB9EF21511E6300CA77B8 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
+		545DB9EF21511E6300CA77B8 /* MainViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MainViewController.swift; sourceTree = "<group>"; };
 		545DB9F221511E6300CA77B8 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
 		545DB9F421511E6400CA77B8 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		545DB9F721511E6400CA77B8 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
@@ -67,11 +91,13 @@
 		545DBA0921511E6400CA77B8 /* SamplesUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = SamplesUITests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		545DBA0D21511E6400CA77B8 /* SampleUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SampleUITests.swift; sourceTree = "<group>"; };
 		545DBA0F21511E6400CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		546341A025C6415100CA0596 /* UseCases.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCases.swift; sourceTree = "<group>"; };
+		546341A025C6415100CA0596 /* UseCase.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UseCase.swift; sourceTree = "<group>"; };
 		546341AB25C6426500CA0596 /* CustomState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CustomState.swift; sourceTree = "<group>"; };
 		549D23CA233C7779008EF4D7 /* FloatingPanel.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = FloatingPanel.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		54B51115216AFE5F0033A6F3 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
-		54CDC5D7215BBE23007D205C /* UIComponents.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIComponents.swift; sourceTree = "<group>"; };
+		54CDC5D7215BBE23007D205C /* Components.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Components.swift; sourceTree = "<group>"; };
+		54EAD35A263A75EB006A36EA /* Layouts.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Layouts.swift; sourceTree = "<group>"; };
+		54EAD364263A765F006A36EA /* PagePanelController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PagePanelController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -100,6 +126,23 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		5442E22225FC519700A26F43 /* ViewControllers */ = {
+			isa = PBXGroup;
+			children = (
+				5442E23F25FC533800A26F43 /* DebugTableViewController.swift */,
+				5442E24925FC53C100A26F43 /* DebugTextViewController.swift */,
+				5442E23325FC528400A26F43 /* DetailViewController.swift */,
+				5442E24325FC538200A26F43 /* InspectorViewController.swift */,
+				5442E22325FC51AF00A26F43 /* ImageViewController.swift */,
+				5442E25125FC541700A26F43 /* NestedScrollViewController.swift */,
+				5442E23925FC52CD00A26F43 /* ModalViewController.swift */,
+				5442E22725FC51E200A26F43 /* MultiPanelController.swift */,
+				5442E22B25FC521F00A26F43 /* SettingsViewController.swift */,
+				5442E22F25FC525200A26F43 /* TabBarViewController.swift */,
+			);
+			path = ViewControllers;
+			sourceTree = "<group>";
+		};
 		545DB9E121511E6300CA77B8 = {
 			isa = PBXGroup;
 			children = (
@@ -128,10 +171,13 @@
 				545DB9F621511E6400CA77B8 /* LaunchScreen.storyboard */,
 				545DB9F121511E6300CA77B8 /* Main.storyboard */,
 				545DB9ED21511E6300CA77B8 /* AppDelegate.swift */,
-				545DB9EF21511E6300CA77B8 /* ViewController.swift */,
-				54B51115216AFE5F0033A6F3 /* Extensions.swift */,
-				54CDC5D7215BBE23007D205C /* UIComponents.swift */,
+				545DB9EF21511E6300CA77B8 /* MainViewController.swift */,
+				54496C58263A7E5A0031E0C8 /* UseCaseController.swift */,
 				546341AA25C6421000CA0596 /* UseCases */,
+				5442E22225FC519700A26F43 /* ViewControllers */,
+				54EAD35A263A75EB006A36EA /* Layouts.swift */,
+				54B51115216AFE5F0033A6F3 /* Extensions.swift */,
+				54CDC5D7215BBE23007D205C /* Components.swift */,
 				545DB9F921511E6400CA77B8 /* Info.plist */,
 			);
 			path = Sources;
@@ -158,8 +204,9 @@
 		546341AA25C6421000CA0596 /* UseCases */ = {
 			isa = PBXGroup;
 			children = (
-				546341A025C6415100CA0596 /* UseCases.swift */,
+				546341A025C6415100CA0596 /* UseCase.swift */,
 				546341AB25C6426500CA0596 /* CustomState.swift */,
+				54EAD364263A765F006A36EA /* PagePanelController.swift */,
 			);
 			path = UseCases;
 			sourceTree = "<group>";
@@ -317,12 +364,25 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				54CDC5D8215BBE23007D205C /* UIComponents.swift in Sources */,
+				5442E23425FC528400A26F43 /* DetailViewController.swift in Sources */,
+				54496C59263A7E5A0031E0C8 /* UseCaseController.swift in Sources */,
+				54CDC5D8215BBE23007D205C /* Components.swift in Sources */,
 				54B51116216AFE5F0033A6F3 /* Extensions.swift in Sources */,
+				5442E24A25FC53C100A26F43 /* DebugTextViewController.swift in Sources */,
 				546341AC25C6426500CA0596 /* CustomState.swift in Sources */,
-				546341A125C6415100CA0596 /* UseCases.swift in Sources */,
-				545DB9F021511E6300CA77B8 /* ViewController.swift in Sources */,
+				5442E23A25FC52CD00A26F43 /* ModalViewController.swift in Sources */,
+				5442E22425FC51AF00A26F43 /* ImageViewController.swift in Sources */,
+				5442E24025FC533800A26F43 /* DebugTableViewController.swift in Sources */,
+				5442E25225FC541700A26F43 /* NestedScrollViewController.swift in Sources */,
+				5442E22825FC51E200A26F43 /* MultiPanelController.swift in Sources */,
+				546341A125C6415100CA0596 /* UseCase.swift in Sources */,
+				545DB9F021511E6300CA77B8 /* MainViewController.swift in Sources */,
 				545DB9EE21511E6300CA77B8 /* AppDelegate.swift in Sources */,
+				5442E23025FC525200A26F43 /* TabBarViewController.swift in Sources */,
+				54EAD35B263A75EB006A36EA /* Layouts.swift in Sources */,
+				54EAD365263A765F006A36EA /* PagePanelController.swift in Sources */,
+				5442E24425FC538200A26F43 /* InspectorViewController.swift in Sources */,
+				5442E22C25FC521F00A26F43 /* SettingsViewController.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Examples/Samples/Sources/Base.lproj/Main.storyboard b/Examples/Samples/Sources/Base.lproj/Main.storyboard
index 4cd2235..5ce6e79 100644
--- a/Examples/Samples/Sources/Base.lproj/Main.storyboard
+++ b/Examples/Samples/Sources/Base.lproj/Main.storyboard
@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17506" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
-    <device id="retina5_9" orientation="portrait" appearance="light"/>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17701" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
     <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17505"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17703"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="Stack View standard spacing" minToolsVersion="9.0"/>
         <capability name="System colors in document resources" minToolsVersion="11.0"/>
@@ -29,24 +27,24 @@
         <!--Samples-->
         <scene sceneID="35L-Gs-Vts">
             <objects>
-                <viewController id="jF4-A0-Eq6" customClass="SampleListViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController id="jF4-A0-Eq6" customClass="MainViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Smh-Bd-AAc">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="7IS-PU-x0P">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                                <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <prototypes>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="Cell" textLabel="M0G-C8-hAO" style="IBUITableViewCellStyleDefault" id="ySY-oA-g81">
-                                        <rect key="frame" x="0.0" y="28" width="375" height="43.666667938232422"/>
+                                        <rect key="frame" x="0.0" y="28" width="600" height="43.5"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="ySY-oA-g81" id="sXB-nH-2g2">
-                                            <rect key="frame" x="0.0" y="0.0" width="375" height="43.666667938232422"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="600" height="43.5"/>
                                             <autoresizingMask key="autoresizingMask"/>
                                             <subviews>
                                                 <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" insetsLayoutMarginsFromSafeArea="NO" text="Title" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="M0G-C8-hAO">
-                                                    <rect key="frame" x="16" y="0.0" width="343" height="43.666667938232422"/>
+                                                    <rect key="frame" x="16" y="0.0" width="568" height="43.5"/>
                                                     <autoresizingMask key="autoresizingMask"/>
                                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                     <nil key="textColor"/>
@@ -87,23 +85,23 @@
             <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" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="n93-ZL-fmC">
-                                <rect key="frame" x="32" y="16" width="311" height="149.33333333333334"/>
+                                <rect key="frame" x="32" y="16" width="311" height="149.5"/>
                                 <subviews>
                                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" alignment="center" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="DCi-Iv-o6d">
-                                        <rect key="frame" x="0.0" y="0.0" width="311" height="52.666666666666664"/>
+                                        <rect key="frame" x="0.0" y="0.0" width="311" height="53"/>
                                         <subviews>
                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Version: 1.0" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WmC-Tq-NDN">
-                                                <rect key="frame" x="118.33333333333334" y="0.0" width="74.333333333333343" height="17.333333333333332"/>
+                                                <rect key="frame" x="118.5" y="0.0" width="74.5" height="17.5"/>
                                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                                 <nil key="textColor"/>
                                                 <nil key="highlightedColor"/>
                                             </label>
                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="UINavigationBar" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Ulg-gS-ah0">
-                                                <rect key="frame" x="78.333333333333329" y="25.333333333333336" width="154.66666666666669" height="27.333333333333336"/>
+                                                <rect key="frame" x="78.5" y="25.5" width="154.5" height="27.5"/>
                                                 <fontDescription key="fontDescription" style="UICTFontTextStyleTitle2"/>
                                                 <nil key="textColor"/>
                                                 <nil key="highlightedColor"/>
@@ -111,19 +109,19 @@
                                         </subviews>
                                     </stackView>
                                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="J8j-7w-yCZ">
-                                        <rect key="frame" x="0.0" y="68.666666666666657" width="311" height="80.666666666666657"/>
+                                        <rect key="frame" x="0.0" y="69" width="311" height="80.5"/>
                                         <subviews>
                                             <stackView opaque="NO" contentMode="scaleToFill" alignment="center" spacingType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="uEf-g4-CeU">
                                                 <rect key="frame" x="0.0" y="0.0" width="311" height="32"/>
                                                 <subviews>
                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Large Titles" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ogl-S5-4tJ">
-                                                        <rect key="frame" x="0.0" y="5.9999999999999982" width="254" height="20.333333333333329"/>
+                                                        <rect key="frame" x="0.0" y="5.5" width="254" height="20.5"/>
                                                         <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                                         <nil key="textColor"/>
                                                         <nil key="highlightedColor"/>
                                                     </label>
                                                     <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="js8-Qv-lUC">
-                                                        <rect key="frame" x="262" y="0.66666666666665719" width="51" height="31"/>
+                                                        <rect key="frame" x="262" y="0.5" width="51" height="31"/>
                                                         <connections>
                                                             <action selector="toggleLargeTitle:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="FJS-Ty-mCY"/>
                                                         </connections>
@@ -131,16 +129,16 @@
                                                 </subviews>
                                             </stackView>
                                             <stackView opaque="NO" contentMode="scaleToFill" alignment="center" spacingType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="ZtZ-Dz-4cC">
-                                                <rect key="frame" x="0.0" y="47.999999999999986" width="311" height="32.666666666666671"/>
+                                                <rect key="frame" x="0.0" y="48" width="311" height="32.5"/>
                                                 <subviews>
                                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Translucent" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Z5i-rm-QgL">
-                                                        <rect key="frame" x="0.0" y="6.333333333333341" width="254" height="20.333333333333329"/>
+                                                        <rect key="frame" x="0.0" y="6" width="254" height="20.5"/>
                                                         <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                                         <nil key="textColor"/>
                                                         <nil key="highlightedColor"/>
                                                     </label>
                                                     <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="s6b-j9-8Kw">
-                                                        <rect key="frame" x="262" y="1" width="51" height="31"/>
+                                                        <rect key="frame" x="262" y="0.5" width="51" height="31"/>
                                                         <connections>
                                                             <action selector="toggleTranslucent:" destination="C1X-9Z-TyQ" eventType="valueChanged" id="nL4-3L-9hh"/>
                                                         </connections>
@@ -177,11 +175,11 @@
             <objects>
                 <viewController id="RpE-lI-27a" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="JER-jz-KSq">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IvG-yp-yzI">
-                                <rect key="frame" x="20" y="44" width="39" height="30"/>
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="RpE-lI-27a" eventType="touchUpInside" id="hj3-Xv-6Gq"/>
@@ -208,11 +206,11 @@
             <objects>
                 <viewController id="pOk-Zm-vD9" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="85d-ub-G8k">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="NbG-e8-HdI">
-                                <rect key="frame" x="20" y="44" width="39" height="30"/>
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="pOk-Zm-vD9" eventType="touchUpInside" id="111-PD-Pop"/>
@@ -239,11 +237,11 @@
             <objects>
                 <viewController id="lto-Zc-Vtp" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="ji9-Ez-N7i">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eFN-tN-4Ct">
-                                <rect key="frame" x="20" y="44" width="39" height="30"/>
+                                <rect key="frame" x="20" y="0.0" width="39" height="30"/>
                                 <state key="normal" title="Close"/>
                                 <connections>
                                     <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="YL4-GP-ZEZ"/>
@@ -274,7 +272,7 @@
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="1000" verticalHuggingPriority="1000" horizontalCompressionResistancePriority="1000" verticalCompressionResistancePriority="1000" text="Change this text" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ge4-RW-Gmz">
-                                <rect key="frame" x="125.66666666666669" y="24" width="124" height="20.333333333333329"/>
+                                <rect key="frame" x="125.5" y="24" width="124" height="20.5"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                 <nil key="textColor"/>
                                 <nil key="highlightedColor"/>
@@ -383,11 +381,11 @@
             <objects>
                 <viewController storyboardIdentifier="ModalViewController" id="bYI-y3-Rzb" customClass="ModalViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="qwo-GK-p1U">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="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="758" width="375" height="0.0"/>
                                 <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                             </view>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sbF-Az-7sy">
@@ -398,7 +396,7 @@
                                 </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="134.5" y="88" width="106" height="326"/>
                                 <subviews>
                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="i9x-x5-n1q">
                                         <rect key="frame" x="0.0" y="0.0" width="80" height="30"/>
@@ -598,11 +596,11 @@
                                 </constraints>
                             </view>
                             <view alpha="0.5" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Kva-Z7-0qY" customClass="OnSafeAreaView" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="0.0" y="44" width="375" height="734"/>
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
                                 <color key="backgroundColor" red="0.0078431372550000003" green="0.72156862749999995" blue="0.45882352939999999" alpha="1" colorSpace="calibratedRGB"/>
                             </view>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="noi-1a-5bZ" customClass="CloseButton" customModule="Samples" customModuleProvider="target">
-                                <rect key="frame" x="319" y="44" width="44" height="44"/>
+                                <rect key="frame" x="319" y="0.0" width="44" height="44"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="44" id="0jg-5D-A1F"/>
                                     <constraint firstAttribute="width" constant="44" id="1Cq-PA-wgW"/>
@@ -612,10 +610,10 @@
                                 </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" height="31"/>
+                                <rect key="frame" x="8" y="8" width="148" height="31"/>
                                 <subviews>
                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="fitToBounds" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7lq-d3-PKi">
-                                        <rect key="frame" x="0.0" y="5.3333333333333357" width="91" height="20.333333333333332"/>
+                                        <rect key="frame" x="0.0" y="5.5" width="91" height="20.5"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                         <nil key="textColor"/>
                                         <nil key="highlightedColor"/>
@@ -629,7 +627,7 @@
                                 </subviews>
                             </stackView>
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="22" translatesAutoresizingMaskIntoConstraints="NO" id="tP3-oJ-4EB">
-                                <rect key="frame" x="130.66666666666666" y="88" width="114" height="134"/>
+                                <rect key="frame" x="130.5" y="88" width="114" height="134"/>
                                 <subviews>
                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="c5r-jU-haj">
                                         <rect key="frame" x="0.0" y="0.0" width="114" height="30"/>
@@ -783,11 +781,6 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
             <point key="canvasLocation" x="-1" y="734"/>
         </scene>
     </scenes>
-    <designables>
-        <designable name="noi-1a-5bZ">
-            <size key="intrinsicContentSize" width="30" height="30"/>
-        </designable>
-    </designables>
     <inferredMetricsTieBreakers>
         <segue reference="r1P-2i-NDe"/>
     </inferredMetricsTieBreakers>
diff --git a/Examples/Samples/Sources/UIComponents.swift b/Examples/Samples/Sources/Components.swift
similarity index 96%
rename from Examples/Samples/Sources/UIComponents.swift
rename to Examples/Samples/Sources/Components.swift
index a3e2c37..e2fdf59 100644
--- a/Examples/Samples/Sources/UIComponents.swift
+++ b/Examples/Samples/Sources/Components.swift
@@ -3,7 +3,7 @@
 import UIKit
 
 @IBDesignable
-class CloseButton: UIButton {
+final class CloseButton: UIButton {
     required init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
         render()
@@ -71,7 +71,7 @@ class CloseButton: UIButton {
 }
 
 @IBDesignable
-class SafeAreaView: UIView {
+final class SafeAreaView: UIView {
     override func prepareForInterfaceBuilder() {
         let label = UILabel()
         label.text = "Safe Area"
@@ -86,7 +86,7 @@ class SafeAreaView: UIView {
 
 
 @IBDesignable
-class OnSafeAreaView: UIView {
+final class OnSafeAreaView: UIView {
     override func prepareForInterfaceBuilder() {
         let label = UILabel()
         label.text = "On Safe Area"
diff --git a/Examples/Samples/Sources/Layouts.swift b/Examples/Samples/Sources/Layouts.swift
new file mode 100644
index 0000000..6adf808
--- /dev/null
+++ b/Examples/Samples/Sources/Layouts.swift
@@ -0,0 +1,90 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+/**
+ - Attention: `FloatingPanelLayout` must not be applied by the parent view
+ controller of a panel. But here `MainViewController` adopts it
+ purposely to check if the library prints an appropriate warning.
+ */
+extension MainViewController: FloatingPanelLayout {
+    var position: FloatingPanelPosition { .bottom }
+    var initialState: FloatingPanelState { .half }
+    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 262.0, edge: .bottom, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class TopPositionedPanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .top
+    let initialState: FloatingPanelState = .full
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 88.0, edge: .bottom, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .top, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class IntrinsicPanelLayout: FloatingPanelBottomLayout {
+    override var initialState: FloatingPanelState { .full }
+    override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class RemovablePanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .half
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 130.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+}
+
+class RemovablePanelLandscapeLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .full
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+}
+
+class ModalPanelLayout: FloatingPanelLayout {
+    let position: FloatingPanelPosition = .bottom
+    let initialState: FloatingPanelState = .full
+
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+}
diff --git a/Examples/Samples/Sources/MainViewController.swift b/Examples/Samples/Sources/MainViewController.swift
new file mode 100644
index 0000000..25b3442
--- /dev/null
+++ b/Examples/Samples/Sources/MainViewController.swift
@@ -0,0 +1,93 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class MainViewController: UIViewController {
+    @IBOutlet weak var tableView: UITableView!
+    private var observations: [NSKeyValueObservation] = []
+
+    private lazy var useCaseController = UseCaseController(mainVC: self)
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        tableView.dataSource = self
+        tableView.delegate = self
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
+        automaticallyAdjustsScrollViewInsets = false
+
+        let searchController = UISearchController(searchResultsController: nil)
+        if #available(iOS 11.0, *) {
+            navigationItem.searchController = searchController
+            navigationItem.hidesSearchBarWhenScrolling = false
+            navigationItem.largeTitleDisplayMode = .automatic
+        } else {
+            // Fallback on earlier versions
+        }
+        var insets = UIEdgeInsets.zero
+        insets.bottom += 69.0
+        tableView.contentInset = insets
+
+        // Show the initial panel
+        useCaseController.set(useCase: .trackingTableView)
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        if #available(iOS 11.0, *) {
+            if let observation = navigationController?.navigationBar.observe(\.prefersLargeTitles, changeHandler: { (bar, _) in
+                self.tableView.reloadData()
+            }) {
+                observations.append(observation)
+            }
+        }
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        observations.removeAll()
+    }
+
+    // MARK:- Actions
+    @IBAction func showDebugMenu(_ sender: UIBarButtonItem) {
+        useCaseController.setUpSettingsPanel(for: self)
+    }
+}
+
+extension MainViewController: UITableViewDataSource {
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        if #available(iOS 11.0, *) {
+            if navigationController?.navigationBar.prefersLargeTitles == true {
+                return UseCase.allCases.count + 30
+            } else {
+                return UseCase.allCases.count
+            }
+        } else {
+            return UseCase.allCases.count
+        }
+    }
+
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        if UseCase.allCases.count > indexPath.row {
+            let menu = UseCase.allCases[indexPath.row]
+            cell.textLabel?.text = menu.name
+        } else {
+            cell.textLabel?.text = "\(indexPath.row) row"
+        }
+        return cell
+    }
+}
+
+extension MainViewController: UITableViewDelegate {
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        guard UseCase.allCases.count > indexPath.row else { return }
+
+        // Change panels
+        useCaseController.set(useCase: UseCase.allCases[indexPath.row])
+    }
+
+    @objc func dismissPresentedVC() {
+        self.presentedViewController?.dismiss(animated: true, completion: nil)
+    }
+}
diff --git a/Examples/Samples/Sources/UseCaseController.swift b/Examples/Samples/Sources/UseCaseController.swift
new file mode 100644
index 0000000..ca3c202
--- /dev/null
+++ b/Examples/Samples/Sources/UseCaseController.swift
@@ -0,0 +1,329 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class UseCaseController: NSObject {
+    unowned let mainVC: MainViewController
+    private(set) var useCase: UseCase = .trackingTableView
+
+    fileprivate var mainPanelVC: FloatingPanelController!
+    private var detailPanelVC: FloatingPanelController!
+    private var settingsPanelVC: FloatingPanelController!
+
+    private lazy var pagePanelController = PagePanelController()
+
+    private var mainPanelObserves: [NSKeyValueObservation] = []
+
+    init(mainVC: MainViewController) {
+        self.mainVC = mainVC
+    }
+
+    func set(useCase: UseCase) {
+        self.useCase = useCase
+
+        let contentVC = useCase.makeContentViewController(with: mainVC.storyboard!)
+
+        detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
+        detailPanelVC = nil
+
+        switch useCase {
+        case .showDetail:
+            detailPanelVC?.removePanelFromParent(animated: false)
+
+            // Initialize FloatingPanelController
+            detailPanelVC = FloatingPanelController()
+            detailPanelVC.delegate = self
+
+            let appearance = SurfaceAppearance()
+            appearance.cornerRadius = 6.0
+            detailPanelVC.surfaceView.appearance = appearance
+
+            // Set a content view controller
+            detailPanelVC.set(contentViewController: contentVC)
+
+            detailPanelVC.contentMode = .fitToBounds
+            (contentVC as? DetailViewController)?.intrinsicHeightConstraint.isActive = false
+
+            //  Add FloatingPanel to self.view
+            detailPanelVC.addPanel(toParent: mainVC, animated: true)
+        case .showModal, .showTabBar:
+            let modalVC = contentVC
+            modalVC.modalPresentationStyle = .fullScreen
+            mainVC.present(modalVC, animated: true, completion: nil)
+
+        case .showPageView:
+            let pageVC = pagePanelController.makePageViewController(for: mainVC)
+            mainVC.present(pageVC, animated: true, completion: nil)
+
+        case .showPageContentView:
+            let pageVC = pagePanelController.makePageViewControllerForContent()
+            self.addMainPanel(with: pageVC)
+        case .showPanelModal:
+            let fpc = FloatingPanelController()
+            let contentVC = mainVC.storyboard!.instantiateViewController(withIdentifier: "DetailViewController")
+            contentVC.loadViewIfNeeded()
+            (contentVC as? DetailViewController)?.modeChangeView.isHidden = true
+            fpc.set(contentViewController: contentVC)
+            fpc.delegate = self
+
+            let appearance = SurfaceAppearance()
+            appearance.cornerRadius = 38.5
+            fpc.surfaceView.appearance = appearance
+            fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+
+            fpc.isRemovalInteractionEnabled = true
+
+            mainVC.present(fpc, animated: true, completion: nil)
+
+        case .showMultiPanelModal:
+            let fpc = MultiPanelController()
+            mainVC.present(fpc, animated: true, completion: nil)
+
+        case .showPanelInSheetModal:
+            let fpc = FloatingPanelController()
+            let contentVC = UIViewController()
+            fpc.set(contentViewController: contentVC)
+            fpc.delegate = self
+
+            let apprearance = SurfaceAppearance()
+            apprearance.cornerRadius = 38.5
+            apprearance.shadows = []
+            fpc.surfaceView.appearance = apprearance
+            fpc.isRemovalInteractionEnabled = true
+
+            let mvc = UIViewController()
+            mvc.view.backgroundColor = UIColor(displayP3Red: 2/255, green: 184/255, blue: 117/255, alpha: 1.0)
+            fpc.addPanel(toParent: mvc)
+            mainVC.present(mvc, animated: true, completion: nil)
+        case .showContentInset:
+            let contentViewController = UIViewController()
+            contentViewController.view.backgroundColor = .green
+
+            let fpc = FloatingPanelController()
+            fpc.set(contentViewController: contentViewController)
+            fpc.surfaceView.contentPadding = .init(top: 20, left: 20, bottom: 20, right: 20)
+
+            fpc.delegate = self
+            fpc.isRemovalInteractionEnabled = true
+            mainVC.present(fpc, animated: true, completion: nil)
+
+        case .showContainerMargins:
+            let fpc = FloatingPanelController()
+
+            let appearance = SurfaceAppearance()
+            appearance.cornerRadius = 38.5
+            fpc.surfaceView.appearance = appearance
+
+            fpc.surfaceView.backgroundColor = .red
+            fpc.surfaceView.containerMargins = .init(top: 24.0, left: 8.0, bottom: max(mainVC.layoutInsets.bottom, 8.0), right: 8.0)
+            #if swift(>=5.1) // Actually Xcode 11 or later
+            if #available(iOS 13.0, *) {
+                fpc.surfaceView.layer.cornerCurve = .continuous
+            }
+            #endif
+
+            fpc.delegate = self
+            fpc.isRemovalInteractionEnabled = true
+            mainVC.present(fpc, animated: true, completion: nil)
+        default:
+            self.addMainPanel(with: contentVC)
+        }
+    }
+
+    private func addMainPanel(with contentVC: UIViewController) {
+        mainPanelObserves.removeAll()
+
+        let oldMainPanelVC = mainPanelVC
+
+        mainPanelVC = FloatingPanelController()
+        mainPanelVC.delegate = self
+        mainPanelVC.contentInsetAdjustmentBehavior = .always
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        mainPanelVC.surfaceView.appearance = appearance
+
+        set(contentViewController: contentVC)
+
+        useCase.setUpInteraction(for: self)
+
+        //  Add FloatingPanel to self.view
+        if let oldMainPanelVC = oldMainPanelVC {
+            oldMainPanelVC.removePanelFromParent(animated: true, completion: {
+                self.mainPanelVC.addPanel(toParent: self.mainVC, animated: true)
+            })
+        } else {
+            mainPanelVC.addPanel(toParent: mainVC, animated: true)
+        }
+    }
+
+    private func set(contentViewController contentVC: UIViewController) {
+        mainPanelVC.set(contentViewController: contentVC)
+        // Track a scroll view
+        switch contentVC {
+        case let consoleVC as DebugTextViewController:
+            mainPanelVC.track(scrollView: consoleVC.textView)
+
+        case let contentVC as DebugTableViewController:
+            let ob = contentVC.tableView.observe(\.isEditing) { (tableView, _) in
+                self.mainPanelVC.panGestureRecognizer.isEnabled = !tableView.isEditing
+            }
+            mainPanelObserves.append(ob)
+            mainPanelVC.track(scrollView: contentVC.tableView)
+        case let contentVC as NestedScrollViewController:
+            mainPanelVC.track(scrollView: contentVC.scrollView)
+        case let navVC as UINavigationController:
+            if let rootVC = (navVC.topViewController as? MainViewController) {
+                rootVC.loadViewIfNeeded()
+                mainPanelVC.track(scrollView: rootVC.tableView)
+            }
+        case let contentVC as ImageViewController:
+            if #available(iOS 11.0, *) {
+                let mode: ImageViewController.Mode = (useCase == .showAdaptivePanelWithCustomGuide) ? .withHeaderFooter : .onlyImage
+                let layoutGuide = contentVC.layoutGuideFor(mode: mode)
+                mainPanelVC.layout = ImageViewController.PanelLayout(targetGuide: layoutGuide)
+            } else {
+                mainPanelVC.layout = ImageViewController.PanelLayout(targetGuide: nil)
+            }
+            mainPanelVC.delegate = nil
+            mainPanelVC.isRemovalInteractionEnabled = true
+            mainPanelVC.track(scrollView: contentVC.scrollView)
+        default:
+            break
+        }
+    }
+
+    @objc
+    fileprivate func handleSurface(tapGesture: UITapGestureRecognizer) {
+        switch mainPanelVC.state {
+        case .full:
+            mainPanelVC.move(to: .half, animated: true)
+        default:
+            mainPanelVC.move(to: .full, animated: true)
+        }
+    }
+
+    func setUpSettingsPanel(for mainVC: MainViewController) {
+        guard settingsPanelVC == nil else { return }
+        // Initialize FloatingPanelController
+        settingsPanelVC = FloatingPanelController()
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        settingsPanelVC.surfaceView.appearance = appearance
+
+        settingsPanelVC.isRemovalInteractionEnabled = true
+        settingsPanelVC.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+        settingsPanelVC.delegate = self
+
+        let contentVC = mainVC.storyboard?.instantiateViewController(withIdentifier: "SettingsViewController")
+
+        // Set a content view controller
+        settingsPanelVC.set(contentViewController: contentVC)
+
+        //  Add FloatingPanel to self.view
+        settingsPanelVC.addPanel(toParent: mainVC, animated: true)
+    }
+}
+
+extension UseCaseController: FloatingPanelControllerDelegate {
+    func floatingPanel(_ vc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint {
+        if useCase == .showNavigationController, #available(iOS 11.0, *) {
+            // 148.0 is the SafeArea's top value for a navigation bar with a large title.
+            return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top - 148.0)
+        }
+        return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top)
+    }
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        if vc == settingsPanelVC {
+            return IntrinsicPanelLayout()
+        }
+
+        switch useCase {
+        case .showTopPositionedPanel:
+            return TopPositionedPanelLayout()
+        case .showRemovablePanel:
+            return newCollection.verticalSizeClass == .compact ? RemovablePanelLandscapeLayout() :  RemovablePanelLayout()
+        case .showIntrinsicView:
+            return IntrinsicPanelLayout()
+        case .showPanelModal:
+            if vc != mainPanelVC && vc != detailPanelVC {
+                return ModalPanelLayout()
+            }
+            fallthrough
+        case .showContentInset:
+            return FloatingPanelBottomLayout()
+        case .showCustomStatePanel:
+            return FloatingPanelLayoutWithCustomState()
+        default:
+            return (newCollection.verticalSizeClass == .compact) ? FloatingPanelBottomLayout() : mainVC
+        }
+    }
+
+    func floatingPanelDidRemove(_ vc: FloatingPanelController) {
+        switch vc {
+        case settingsPanelVC:
+            settingsPanelVC = nil
+        default:
+            break
+        }
+    }
+}
+
+extension UseCaseController: UIGestureRecognizerDelegate {
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        switch useCase {
+        case .showNestedScrollView:
+            return true
+        default:
+            return false
+        }
+    }
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+}
+
+extension UseCase {
+    func makeContentViewController(with storyboard: UIStoryboard) -> UIViewController {
+        guard let storyboardID = self.storyboardID else { return DebugTableViewController() }
+        return storyboard.instantiateViewController(withIdentifier: storyboardID)
+    }
+
+    func setUpInteraction(for useCaseController: UseCaseController) {
+        let mainVC = useCaseController.mainVC
+        let mainPanelVC = useCaseController.mainPanelVC!
+
+        // Enable tap-to-hide and removal interaction
+        switch self {
+        case .trackingTableView:
+            let tapGesture = UITapGestureRecognizer(target: useCaseController, action: #selector(UseCaseController.handleSurface(tapGesture:)))
+            tapGesture.cancelsTouchesInView = false
+            tapGesture.numberOfTapsRequired = 2
+            // Prevents a delay to response a tap in menus of DebugTableViewController.
+            tapGesture.delaysTouchesEnded = false
+            mainPanelVC.surfaceView.addGestureRecognizer(tapGesture)
+        case .showNestedScrollView:
+            mainPanelVC.panGestureRecognizer.delegateProxy = useCaseController
+        case .showPageContentView:
+            if let page = (mainPanelVC.contentViewController as? UIPageViewController)?.viewControllers?.first {
+                mainPanelVC.track(scrollView: (page as! DebugTableViewController).tableView)
+            }
+        case .showRemovablePanel, .showIntrinsicView:
+            mainPanelVC.isRemovalInteractionEnabled = true
+            mainPanelVC.backdropView.dismissalTapGestureRecognizer.isEnabled = true
+        case .showNavigationController:
+            mainPanelVC.contentInsetAdjustmentBehavior = .never
+        case .showTopPositionedPanel: // For debug
+            let contentVC = UIViewController()
+            contentVC.view.backgroundColor = .red
+            mainPanelVC.set(contentViewController: contentVC)
+            mainPanelVC.addPanel(toParent: mainVC, animated: true)
+            return
+        default:
+            break
+        }
+    }
+}
diff --git a/Examples/Samples/Sources/UseCases/PagePanelController.swift b/Examples/Samples/Sources/UseCases/PagePanelController.swift
new file mode 100644
index 0000000..98ad30f
--- /dev/null
+++ b/Examples/Samples/Sources/UseCases/PagePanelController.swift
@@ -0,0 +1,82 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class PagePanelController: NSObject {
+    lazy var pages = [UIColor.blue, .red, .green].compactMap({ (color) -> UIViewController in
+        let page = FloatingPanelController(delegate: self)
+        page.view.backgroundColor = color
+        page.panGestureRecognizer.delegateProxy = self
+        page.show()
+        return page
+    })
+
+    func makePageViewControllerForContent() -> UIPageViewController {
+        pages = [DebugTableViewController(), DebugTableViewController(), DebugTableViewController()]
+        let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
+        pageVC.dataSource = self
+        pageVC.delegate = self
+        pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
+        return pageVC
+    }
+
+    func makePageViewController(for vc: MainViewController) -> UIPageViewController {
+        let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
+        let closeButton = UIButton(type: .custom)
+        pageVC.view.addSubview(closeButton)
+        closeButton.setTitle("Close", for: .normal)
+        closeButton.translatesAutoresizingMaskIntoConstraints = false
+        closeButton.addTarget(vc, action: #selector(MainViewController.dismissPresentedVC), for: .touchUpInside)
+        NSLayoutConstraint.activate([
+            closeButton.topAnchor.constraint(equalTo: pageVC.layoutGuide.topAnchor, constant: 16.0),
+            closeButton.leftAnchor.constraint(equalTo: pageVC.view.leftAnchor, constant: 16.0),
+            ])
+        pageVC.dataSource = self
+        pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
+        pageVC.modalPresentationStyle = .fullScreen
+        return pageVC
+    }
+}
+
+extension PagePanelController: FloatingPanelControllerDelegate {
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        return FloatingPanelBottomLayout()
+    }
+}
+
+extension PagePanelController: UIGestureRecognizerDelegate {
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return true
+    }
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
+}
+
+
+extension PagePanelController: UIPageViewControllerDataSource {
+    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
+        guard
+            let index = pages.firstIndex(of: viewController),
+            index + 1 < pages.count
+            else { return nil }
+        return pages[index + 1]
+    }
+    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
+        guard
+            let index = pages.firstIndex(of: viewController),
+            index - 1 >= 0
+            else { return nil }
+        return pages[index - 1]
+    }
+}
+
+extension PagePanelController: UIPageViewControllerDelegate {
+    // For showPageContent
+    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
+        if completed, let page = pageViewController.viewControllers?.first {
+            (pageViewController.parent as! FloatingPanelController).track(scrollView: (page as! DebugTableViewController).tableView)
+        }
+    }
+}
diff --git a/Examples/Samples/Sources/UseCases/UseCases.swift b/Examples/Samples/Sources/UseCases/UseCase.swift
similarity index 81%
rename from Examples/Samples/Sources/UseCases/UseCases.swift
rename to Examples/Samples/Sources/UseCases/UseCase.swift
index a7bf34f..f231a77 100644
--- a/Examples/Samples/Sources/UseCases/UseCases.swift
+++ b/Examples/Samples/Sources/UseCases/UseCase.swift
@@ -2,7 +2,7 @@
 
 import Foundation
 
-enum UseCases: Int, CaseIterable {
+enum UseCase: Int, CaseIterable {
     case trackingTableView
     case trackingTextView
     case showDetail
@@ -52,25 +52,25 @@ enum UseCases: Int, CaseIterable {
     var storyboardID: String? {
         switch self {
         case .trackingTableView: return nil
-        case .trackingTextView: return "ConsoleViewController"
-        case .showDetail: return "DetailViewController"
-        case .showModal: return "ModalViewController"
+        case .trackingTextView: return "ConsoleViewController" // Storyboard only
+        case .showDetail: return String(describing: DetailViewController.self)
+        case .showModal: return String(describing: ModalViewController.self)
         case .showMultiPanelModal: return nil
         case .showPanelInSheetModal: return nil
         case .showPanelModal: return nil
-        case .showTabBar: return "TabBarViewController"
+        case .showTabBar: return String(describing: TabBarViewController.self)
         case .showPageView: return nil
         case .showPageContentView: return nil
-        case .showNestedScrollView: return "NestedScrollViewController"
-        case .showRemovablePanel: return "DetailViewController"
-        case .showIntrinsicView: return "IntrinsicViewController"
+        case .showNestedScrollView: return String(describing: NestedScrollViewController.self)
+        case .showRemovablePanel: return String(describing: DetailViewController.self)
+        case .showIntrinsicView: return "IntrinsicViewController" // Storyboard only
         case .showContentInset: return nil
         case .showContainerMargins: return nil
-        case .showNavigationController: return "RootNavigationController"
+        case .showNavigationController: return "RootNavigationController" // Storyboard only
         case .showTopPositionedPanel: return nil
         case .showAdaptivePanel,
              .showAdaptivePanelWithCustomGuide:
-            return "ImageViewController"
+            return String(describing: ImageViewController.self)
         case .showCustomStatePanel:
             return nil
         }
diff --git a/Examples/Samples/Sources/ViewController.swift b/Examples/Samples/Sources/ViewController.swift
deleted file mode 100644
index eefc0e3..0000000
--- a/Examples/Samples/Sources/ViewController.swift
+++ /dev/null
@@ -1,1313 +0,0 @@
-// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
-
-import UIKit
-import FloatingPanel
-
-class SampleListViewController: UIViewController {
-    @IBOutlet weak var tableView: UITableView!
-
-    var currentMenu: UseCases = .trackingTableView
-
-    var mainPanelVC: FloatingPanelController!
-    var detailPanelVC: FloatingPanelController!
-    var settingsPanelVC: FloatingPanelController!
-
-    var mainPanelObserves: [NSKeyValueObservation] = []
-    var settingsObserves: [NSKeyValueObservation] = []
-
-    var pages: [UIViewController] = []
-
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        tableView.dataSource = self
-        tableView.delegate = self
-        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
-        automaticallyAdjustsScrollViewInsets = false
-
-        let searchController = UISearchController(searchResultsController: nil)
-        if #available(iOS 11.0, *) {
-            navigationItem.searchController = searchController
-            navigationItem.hidesSearchBarWhenScrolling = false
-            navigationItem.largeTitleDisplayMode = .automatic
-        } else {
-            // Fallback on earlier versions
-        }
-
-        let contentVC = DebugTableViewController()
-        addMainPanel(with: contentVC)
-
-        var insets = UIEdgeInsets.zero
-        insets.bottom += 69.0
-        tableView.contentInset = insets
-    }
-
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-        if #available(iOS 11.0, *) {
-            if let observation = navigationController?.navigationBar.observe(\.prefersLargeTitles, changeHandler: { (bar, _) in
-                self.tableView.reloadData()
-            }) {
-                settingsObserves.append(observation)
-            }
-        }
-    }
-
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        settingsObserves.removeAll()
-    }
-
-    func addMainPanel(with contentVC: UIViewController) {
-        mainPanelObserves.removeAll()
-
-        let oldMainPanelVC = mainPanelVC
-
-        mainPanelVC = FloatingPanelController()
-        mainPanelVC.delegate = self
-        mainPanelVC.contentInsetAdjustmentBehavior = .always
-
-        let appearance = SurfaceAppearance()
-        appearance.cornerRadius = 6.0
-        mainPanelVC.surfaceView.appearance = appearance
-
-        mainPanelVC.set(contentViewController: contentVC)
-
-        // Enable tap-to-hide and removal interaction
-        switch currentMenu {
-        case .trackingTableView:
-            let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleSurface(tapGesture:)))
-            tapGesture.cancelsTouchesInView = false
-            tapGesture.numberOfTapsRequired = 2
-            // Prevents a delay to response a tap in menus of DebugTableViewController.
-            tapGesture.delaysTouchesEnded = false
-            mainPanelVC.surfaceView.addGestureRecognizer(tapGesture)
-        case .showNestedScrollView:
-            mainPanelVC.panGestureRecognizer.delegateProxy = self
-        case .showPageContentView:
-            if let page = (mainPanelVC.contentViewController as? UIPageViewController)?.viewControllers?.first {
-                mainPanelVC.track(scrollView: (page as! DebugTableViewController).tableView)
-            }
-        case .showRemovablePanel, .showIntrinsicView:
-            mainPanelVC.isRemovalInteractionEnabled = true
-            mainPanelVC.backdropView.dismissalTapGestureRecognizer.isEnabled = true
-        case .showNavigationController:
-            mainPanelVC.contentInsetAdjustmentBehavior = .never
-        case .showTopPositionedPanel: // For debug
-            let contentVC = UIViewController()
-            contentVC.view.backgroundColor = .red
-            mainPanelVC.set(contentViewController: contentVC)
-            mainPanelVC.addPanel(toParent: self, animated: true)
-            return
-        default:
-            break
-        }
-
-        // Track a scroll view
-        switch contentVC {
-        case let consoleVC as DebugTextViewController:
-            mainPanelVC.track(scrollView: consoleVC.textView)
-
-        case let contentVC as DebugTableViewController:
-            let ob = contentVC.tableView.observe(\.isEditing) { (tableView, _) in
-                self.mainPanelVC.panGestureRecognizer.isEnabled = !tableView.isEditing
-            }
-            mainPanelObserves.append(ob)
-            mainPanelVC.track(scrollView: contentVC.tableView)
-        case let contentVC as NestedScrollViewController:
-            mainPanelVC.track(scrollView: contentVC.scrollView)
-        case let navVC as UINavigationController:
-            if let rootVC = (navVC.topViewController as? SampleListViewController) {
-                rootVC.loadViewIfNeeded()
-                mainPanelVC.track(scrollView: rootVC.tableView)
-            }
-        case let contentVC as ImageViewController:
-            if #available(iOS 11.0, *) {
-                let mode: ImageViewController.Mode = (currentMenu == .showAdaptivePanelWithCustomGuide) ? .withHeaderFooter : .onlyImage
-                let layoutGuide = contentVC.layoutGuideFor(mode: mode)
-                mainPanelVC.layout = ImageViewController.PanelLayout(targetGuide: layoutGuide)
-            } else {
-                mainPanelVC.layout = ImageViewController.PanelLayout(targetGuide: nil)
-            }
-            mainPanelVC.delegate = nil
-            mainPanelVC.isRemovalInteractionEnabled = true
-            mainPanelVC.track(scrollView: contentVC.scrollView)
-        default:
-            break
-        }
-
-        //  Add FloatingPanel to self.view
-        if let oldMainPanelVC = oldMainPanelVC {
-            oldMainPanelVC.removePanelFromParent(animated: true, completion: {
-                self.mainPanelVC.addPanel(toParent: self, animated: true)
-            })
-        } else {
-            mainPanelVC.addPanel(toParent: self, animated: true)
-        }
-    }
-
-    @objc
-    func handleSurface(tapGesture: UITapGestureRecognizer) {
-        switch mainPanelVC.state {
-        case .full:
-            mainPanelVC.move(to: .half, animated: true)
-        default:
-            mainPanelVC.move(to: .full, animated: true)
-        }
-    }
-
-    // MARK:- Actions
-    @IBAction func showDebugMenu(_ sender: UIBarButtonItem) {
-        guard settingsPanelVC == nil else { return }
-        // Initialize FloatingPanelController
-        settingsPanelVC = FloatingPanelController()
-
-        let appearance = SurfaceAppearance()
-        appearance.cornerRadius = 6.0
-        settingsPanelVC.surfaceView.appearance = appearance
-
-        settingsPanelVC.isRemovalInteractionEnabled = true
-        settingsPanelVC.backdropView.dismissalTapGestureRecognizer.isEnabled = true
-        settingsPanelVC.delegate = self
-
-        let contentVC = storyboard?.instantiateViewController(withIdentifier: "SettingsViewController")
-
-        // Set a content view controller
-        settingsPanelVC.set(contentViewController: contentVC)
-
-        //  Add FloatingPanel to self.view
-        settingsPanelVC.addPanel(toParent: self, animated: true)
-    }
-}
-
-extension SampleListViewController: UITableViewDataSource {
-    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        if #available(iOS 11.0, *) {
-            if navigationController?.navigationBar.prefersLargeTitles == true {
-                return UseCases.allCases.count + 30
-            } else {
-                return UseCases.allCases.count
-            }
-        } else {
-            return UseCases.allCases.count
-        }
-    }
-
-    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
-        if UseCases.allCases.count > indexPath.row {
-            let menu = UseCases.allCases[indexPath.row]
-            cell.textLabel?.text = menu.name
-        } else {
-            cell.textLabel?.text = "\(indexPath.row) row"
-        }
-        return cell
-    }
-}
-
-extension SampleListViewController: UITableViewDelegate {
-    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        guard UseCases.allCases.count > indexPath.row else { return }
-        let menu = UseCases.allCases[indexPath.row]
-        let contentVC: UIViewController = {
-            guard let storyboardID = menu.storyboardID else { return DebugTableViewController() }
-            guard let vc = self.storyboard?.instantiateViewController(withIdentifier: storyboardID) else { fatalError() }
-            return vc
-        }()
-
-        self.currentMenu = menu
-        detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
-        detailPanelVC = nil
-
-        switch menu {
-        case .showDetail:
-            detailPanelVC?.removePanelFromParent(animated: false)
-
-            // Initialize FloatingPanelController
-            detailPanelVC = FloatingPanelController()
-            detailPanelVC.delegate = self
-
-            let appearance = SurfaceAppearance()
-            appearance.cornerRadius = 6.0
-            detailPanelVC.surfaceView.appearance = appearance
-
-            // Set a content view controller
-            detailPanelVC.set(contentViewController: contentVC)
-
-            detailPanelVC.contentMode = .fitToBounds
-            (contentVC as? DetailViewController)?.intrinsicHeightConstraint.isActive = false
-
-            //  Add FloatingPanel to self.view
-            detailPanelVC.addPanel(toParent: self, 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.panGestureRecognizer.delegateProxy = self
-                page.show()
-                return page
-            })
-
-            let pageVC = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
-            let closeButton = UIButton(type: .custom)
-            pageVC.view.addSubview(closeButton)
-            closeButton.setTitle("Close", for: .normal)
-            closeButton.translatesAutoresizingMaskIntoConstraints = false
-            closeButton.addTarget(self, action: #selector(dismissPresentedVC), for: .touchUpInside)
-            NSLayoutConstraint.activate([
-                closeButton.topAnchor.constraint(equalTo: pageVC.layoutGuide.topAnchor, constant: 16.0),
-                closeButton.leftAnchor.constraint(equalTo: pageVC.view.leftAnchor, constant: 16.0),
-                ])
-            pageVC.dataSource = self
-            pageVC.setViewControllers([pages[0]], direction: .forward, animated: false, completion: nil)
-            pageVC.modalPresentationStyle = .fullScreen
-            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:
-            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
-
-            let appearance = SurfaceAppearance()
-            appearance.cornerRadius = 38.5
-            fpc.surfaceView.appearance = appearance
-            fpc.backdropView.dismissalTapGestureRecognizer.isEnabled = true
-
-            fpc.isRemovalInteractionEnabled = true
-
-            self.present(fpc, animated: true, completion: nil)
-
-        case .showMultiPanelModal:
-            let fpc = MultiPanelController()
-            self.present(fpc, animated: true, completion: nil)
-
-        case .showPanelInSheetModal:
-            let fpc = FloatingPanelController()
-            let contentVC = UIViewController()
-            fpc.set(contentViewController: contentVC)
-            fpc.delegate = self
-
-            let apprearance = SurfaceAppearance()
-            apprearance.cornerRadius = 38.5
-            apprearance.shadows = []
-            fpc.surfaceView.appearance = apprearance
-            fpc.isRemovalInteractionEnabled = true
-
-            let mvc = UIViewController()
-            mvc.view.backgroundColor = UIColor(displayP3Red: 2/255, green: 184/255, blue: 117/255, alpha: 1.0)
-            fpc.addPanel(toParent: mvc)
-            self.present(mvc, animated: true, completion: nil)
-        case .showContentInset:
-            let contentViewController = UIViewController()
-            contentViewController.view.backgroundColor = .green
-
-            let fpc = FloatingPanelController()
-            fpc.set(contentViewController: contentViewController)
-            fpc.surfaceView.contentPadding = .init(top: 20, left: 20, bottom: 20, right: 20)
-
-            fpc.delegate = self
-            fpc.isRemovalInteractionEnabled = true
-            self.present(fpc, animated: true, completion: nil)
-
-        case .showContainerMargins:
-            let fpc = FloatingPanelController()
-
-            let appearance = SurfaceAppearance()
-            appearance.cornerRadius = 38.5
-            fpc.surfaceView.appearance = appearance
-
-            fpc.surfaceView.backgroundColor = .red
-            fpc.surfaceView.containerMargins = .init(top: 24.0, left: 8.0, bottom: max(layoutInsets.bottom, 8.0), right: 8.0)
-            #if swift(>=5.1) // Actually Xcode 11 or later
-            if #available(iOS 13.0, *) {
-                fpc.surfaceView.layer.cornerCurve = .continuous
-            }
-            #endif
-
-            fpc.delegate = self
-            fpc.isRemovalInteractionEnabled = true
-            self.present(fpc, animated: true, completion: nil)
-        default:
-            self.addMainPanel(with: contentVC)
-        }
-    }
-
-    @objc func dismissPresentedVC() {
-        self.presentedViewController?.dismiss(animated: true, completion: nil)
-    }
-}
-
-extension SampleListViewController: FloatingPanelControllerDelegate {
-    func floatingPanel(_ vc: FloatingPanelController, contentOffsetForPinning trackingScrollView: UIScrollView) -> CGPoint {
-        if currentMenu == .showNavigationController, #available(iOS 11.0, *) {
-            // 148.0 is the SafeArea's top value for a navigation bar with a large title.
-            return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top - 148.0)
-        }
-        return CGPoint(x: 0.0, y: 0.0 - trackingScrollView.contentInset.top)
-    }
-
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
-        if vc == settingsPanelVC {
-            return IntrinsicPanelLayout()
-        }
-
-        switch currentMenu {
-        case .showTopPositionedPanel:
-            return TopPositionedPanelLayout()
-        case .showRemovablePanel:
-            return newCollection.verticalSizeClass == .compact ? RemovablePanelLandscapeLayout() :  RemovablePanelLayout()
-        case .showIntrinsicView:
-            return IntrinsicPanelLayout()
-        case .showPanelModal:
-            if vc != mainPanelVC && vc != detailPanelVC {
-                return ModalPanelLayout()
-            }
-            fallthrough
-        case .showContentInset:
-            return FloatingPanelBottomLayout()
-        case .showCustomStatePanel:
-            return FloatingPanelLayoutWithCustomState()
-        default:
-            return (newCollection.verticalSizeClass == .compact) ? FloatingPanelBottomLayout() : self
-        }
-    }
-
-    func floatingPanelDidRemove(_ vc: FloatingPanelController) {
-        switch vc {
-        case settingsPanelVC:
-            settingsPanelVC = nil
-        default:
-            break
-        }
-    }
-}
-
-extension SampleListViewController: UIGestureRecognizerDelegate {
-    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
-        switch currentMenu {
-        case .showNestedScrollView:
-            return true
-        case .showPageView:
-            // Tips: Need to allow recognizing the pan gesture of UIPageViewController simultaneously.
-            return true
-        default:
-            return false
-        }
-    }
-    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
-        return false
-    }
-}
-
-/**
- - Attention: `FloatingPanelLayout` must not be applied by the parent view
- controller of a panel. But here `SampleListViewController` adopts it
- purposely to check if the library prints an appropriate warning.
- */
-extension SampleListViewController: FloatingPanelLayout {
-    var position: FloatingPanelPosition { .bottom }
-    var initialState: FloatingPanelState { .half }
-    var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0, edge: .top, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 262.0, edge: .bottom, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 69.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
-}
-
-extension SampleListViewController: UIPageViewControllerDataSource {
-    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
-        guard
-            let index = pages.firstIndex(of: viewController),
-            index + 1 < pages.count
-            else { return nil }
-        return pages[index + 1]
-    }
-    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
-        guard
-            let index = pages.firstIndex(of: viewController),
-            index - 1 >= 0
-            else { return nil }
-        return pages[index - 1]
-    }
-}
-extension 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 TopPositionedPanelLayout: FloatingPanelLayout {
-    let position: FloatingPanelPosition = .top
-    let initialState: FloatingPanelState = .full
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 88.0, edge: .bottom, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .top, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .top, referenceGuide: .safeArea)
-        ]
-    }
-}
-
-class IntrinsicPanelLayout: FloatingPanelBottomLayout {
-    override var initialState: FloatingPanelState { .full }
-    override var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea)
-        ]
-    }
-}
-
-class RemovablePanelLayout: FloatingPanelLayout {
-    let position: FloatingPanelPosition = .bottom
-    let initialState: FloatingPanelState = .half
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 130.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
-
-    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
-        return 0.3
-    }
-}
-
-class RemovablePanelLandscapeLayout: FloatingPanelLayout {
-    let position: FloatingPanelPosition = .bottom
-    let initialState: FloatingPanelState = .full
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(fractionalOffset: 0.0, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 216.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
-
-    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
-        return 0.3
-    }
-}
-
-class ModalPanelLayout: FloatingPanelLayout {
-    let position: FloatingPanelPosition = .bottom
-    let initialState: FloatingPanelState = .full
-
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea),
-        ]
-    }
-
-    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
-        return 0.3
-    }
-}
-
-class NestedScrollViewController: UIViewController {
-    @IBOutlet weak var scrollView: UIScrollView!
-    @IBOutlet weak var nestedScrollView: UIScrollView!
-
-    @IBAction func longPressed(_ sender: Any) {
-        print("LongPressed!")
-    }
-    @IBAction func swipped(_ sender: Any) {
-        print("Swipped!")
-    }
-    @IBAction func tapped(_ sender: Any) {
-        print("Tapped!")
-    }
-}
-
-class DebugTextViewController: UIViewController, UITextViewDelegate {
-    @IBOutlet weak var textView: UITextView!
-    @IBOutlet weak var textViewTopConstraint: NSLayoutConstraint!
-
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        textView.delegate = self
-        print("viewDidLoad: TextView --- ", textView.contentOffset, textView.contentInset)
-
-        if #available(iOS 11.0, *) {
-            textView.contentInsetAdjustmentBehavior = .never
-        }
-    }
-
-    override func viewWillLayoutSubviews() {
-        print("viewWillLayoutSubviews: TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
-    }
-
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        print("viewDidLayoutSubviews: TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
-    }
-
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-        print("TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
-    }
-
-    func scrollViewDidScroll(_ scrollView: UIScrollView) {
-        print("TextView --- ", scrollView.contentOffset, scrollView.contentInset)
-        if #available(iOS 11.0, *) {
-            print("TextView --- ", scrollView.adjustedContentInset)
-        }
-    }
-
-    @IBAction func close(sender: UIButton) {
-        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
-        dismiss(animated: true, completion: nil)
-    }
-}
-
-class InspectableViewController: UIViewController {
-    override func viewWillLayoutSubviews() {
-        super.viewWillLayoutSubviews()
-        print(">>> Content View: viewWillLayoutSubviews", layoutInsets)
-    }
-
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        print(">>> Content View: viewDidLayoutSubviews", layoutInsets)
-    }
-
-    override func viewWillAppear(_ animated: Bool) {
-        super.viewWillAppear(animated)
-        print(">>> Content View: viewWillAppear", layoutInsets)
-    }
-
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-        print(">>> Content View: viewDidAppear", view.bounds, layoutInsets)
-    }
-
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        print(">>> Content View: viewWillDisappear")
-    }
-
-    override func viewDidDisappear(_ animated: Bool) {
-        super.viewDidDisappear(animated)
-        print(">>> Content View: viewDidDisappear")
-    }
-
-    override func willMove(toParent parent: UIViewController?) {
-        super.willMove(toParent: parent)
-        print(">>> Content View: willMove(toParent: \(String(describing: parent))")
-    }
-
-    override func didMove(toParent parent: UIViewController?) {
-        super.didMove(toParent: parent)
-        print(">>> Content View: didMove(toParent: \(String(describing: parent))")
-    }
-    public override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
-        print(">>> Content View: willTransition(to: \(newCollection), with: \(coordinator))", layoutInsets)
-    }
-}
-
-class DebugTableViewController: InspectableViewController {
-    lazy var tableView = UITableView(frame: .zero, style: .plain)
-    lazy var buttonStackView = UIStackView()
-    var items: [String] = []
-    var itemHeight: CGFloat = 66.0
-
-    enum Menu: String, CaseIterable {
-        case animateScroll = "Animate Scroll"
-        case changeContentSize = "Change content size"
-        case reorder = "Reorder"
-        case moveToFull = "Move to Full"
-        case moveToHalf = "Move to Half"
-    }
-
-    var reorderButton: UIButton!
-    override func viewDidLoad() {
-        super.viewDidLoad()
-
-        view.addSubview(tableView)
-        tableView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            tableView.topAnchor.constraint(equalTo: view.topAnchor),
-            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
-            tableView.leftAnchor.constraint(equalTo: view.leftAnchor),
-            tableView.rightAnchor.constraint(equalTo: view.rightAnchor)
-            ])
-        tableView.dataSource = self
-        tableView.delegate = self
-        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
-
-        view.addSubview(buttonStackView)
-        buttonStackView.axis = .vertical
-        buttonStackView.distribution = .fillEqually
-        buttonStackView.alignment = .trailing
-        buttonStackView.spacing = 10.0
-        buttonStackView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            buttonStackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 22.0),
-            buttonStackView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -22.0),
-            ])
-
-        for menu in Menu.allCases {
-            let button = UIButton()
-            button.setTitle(menu.rawValue, for: .normal)
-            button.setTitleColor(view.tintColor, for: .normal)
-            switch menu {
-            case .animateScroll:
-                button.addTarget(self, action: #selector(animateScroll), for: .touchUpInside)
-            case .changeContentSize:
-                button.addTarget(self, action: #selector(changeContentSize), for: .touchUpInside)
-            case .reorder:
-                button.addTarget(self, action: #selector(reorderItems), for: .touchUpInside)
-                reorderButton = button
-            case .moveToFull:
-                button.addTarget(self, action: #selector(moveToFull), for: .touchUpInside)
-            case .moveToHalf:
-                button.addTarget(self, action: #selector(moveToHalf), for: .touchUpInside)
-            }
-            buttonStackView.addArrangedSubview(button)
-        }
-
-        for i in 0...100 {
-            items.append("Items \(i)")
-        }
-    }
-
-    @objc func animateScroll() {
-        tableView.scrollToRow(at: IndexPath(row: lround(Double(items.count) / 2.0),
-                                            section: 0),
-                              at: .top, animated: true)
-    }
-
-    @objc func changeContentSize() {
-        let actionSheet = UIAlertController(title: "Change content size", message: "", preferredStyle: .actionSheet)
-        actionSheet.addAction(UIAlertAction(title: "Large", style: .default, handler: { (_) in
-            self.itemHeight = 66.0
-            self.changeItems(100)
-        }))
-        actionSheet.addAction(UIAlertAction(title: "Match", style: .default, handler: { (_) in
-            switch self.tableView.bounds.height {
-            case 585: // iPhone 6,7,8
-                self.itemHeight = self.tableView.bounds.height / 13.0
-                self.changeItems(13)
-            case 656: // iPhone {6,7,8} Plus
-                self.itemHeight = self.tableView.bounds.height / 16.0
-                self.changeItems(16)
-            default: // iPhone X family
-                self.itemHeight = self.tableView.bounds.height / 12.0
-                self.changeItems(12)
-            }
-        }))
-        actionSheet.addAction(UIAlertAction(title: "Short", style: .default, handler: { (_) in
-            self.itemHeight = 66.0
-            self.changeItems(3)
-        }))
-
-        self.present(actionSheet, animated: true, completion: nil)
-    }
-
-    @objc func reorderItems() {
-        if reorderButton.titleLabel?.text == Menu.reorder.rawValue {
-            tableView.isEditing = true
-            reorderButton.setTitle("Cancel", for: .normal)
-        } else {
-            tableView.isEditing = false
-            reorderButton.setTitle(Menu.reorder.rawValue, for: .normal)
-        }
-    }
-
-    func changeItems(_ count: Int) {
-        items.removeAll()
-        for i in 0..<count {
-            items.append("Items \(i)")
-        }
-        tableView.reloadData()
-    }
-
-    @objc func moveToFull() {
-        (self.parent as! FloatingPanelController).move(to: .full, animated: true)
-    }
-
-    @objc func moveToHalf() {
-        (self.parent as! FloatingPanelController).move(to: .half, animated: true)
-    }
-
-    @objc func close(sender: UIButton) {
-        //  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 {
-    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return items.count
-    }
-
-    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
-        return itemHeight
-    }
-
-    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
-        cell.textLabel?.text = items[indexPath.row]
-        return cell
-    }
-}
-
-extension DebugTableViewController: UITableViewDelegate {
-    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        print("DebugTableViewController -- select row \(indexPath.row)")
-    }
-
-    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
-        return [
-            UITableViewRowAction(style: .destructive, title: "Delete", handler: { (action, path) in
-                self.items.remove(at: path.row)
-                tableView.deleteRows(at: [path], with: .automatic)
-            }),
-        ]
-    }
-
-    func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
-        return true
-    }
-
-    func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
-        items.insert(items.remove(at: sourceIndexPath.row), at: destinationIndexPath.row)
-    }
-}
-
-class DetailViewController: InspectableViewController {
-    @IBOutlet weak var modeChangeView: UIStackView!
-    @IBOutlet weak var intrinsicHeightConstraint: NSLayoutConstraint!
-    @IBOutlet weak var closeButton: UIButton!
-    @IBAction func close(sender: UIButton) {
-        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
-        dismiss(animated: true, completion: nil)
-    }
-
-    @IBAction func buttonPressed(_ sender: UIButton) {
-        switch sender.titleLabel?.text {
-        case "Show":
-            performSegue(withIdentifier: "ShowSegue", sender: self)
-        case "Present Modally":
-            performSegue(withIdentifier: "PresentModallySegue", sender: self)
-        default:
-            break
-        }
-    }
-    @IBAction func modeChanged(_ sender: Any) {
-        guard let fpc = parent as? FloatingPanelController else { return }
-        fpc.contentMode = (fpc.contentMode == .static) ? .fitToBounds : .static
-    }
-
-    @IBAction func tapped(_ sender: Any) {
-        print("Detail panel is tapped!")
-    }
-    @IBAction func swipped(_ sender: Any) {
-        print("Detail panel is swipped!")
-    }
-    @IBAction func longPressed(_ sender: Any) {
-        print("Detail panel is longPressed!")
-    }
-}
-
-class ModalViewController: UIViewController, FloatingPanelControllerDelegate {
-    var fpc: FloatingPanelController!
-    var consoleVC: DebugTextViewController!
-
-    @IBOutlet weak var safeAreaView: UIView!
-
-    var isNewlayout: Bool = false
-
-    override func viewDidLoad() {
-        // Initialize FloatingPanelController
-        fpc = FloatingPanelController()
-        fpc.delegate = self
-
-        let appearance = SurfaceAppearance()
-        appearance.cornerRadius = 6.0
-        fpc.surfaceView.appearance = appearance
-
-        // Set a content view controller and track the scroll view
-        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
-        fpc.set(contentViewController: consoleVC)
-        fpc.track(scrollView: consoleVC.textView)
-
-        self.consoleVC = consoleVC
-
-        //  Add FloatingPanel to self.view
-        fpc.addPanel(toParent: self, at: view.subviews.firstIndex(of: safeAreaView) ?? -1)
-    }
-
-    override func viewDidDisappear(_ animated: Bool) {
-        super.viewDidDisappear(animated)
-        //  Remove FloatingPanel from a view
-        fpc.removePanelFromParent(animated: false)
-    }
-
-    @IBAction func close(sender: UIButton) {
-        dismiss(animated: true, completion: nil)
-    }
-
-    @IBAction func moveToFull(sender: UIButton) {
-        fpc.move(to: .full, animated: true)
-    }
-    @IBAction func moveToHalf(sender: UIButton) {
-        fpc.move(to: .half, animated: true)
-    }
-    @IBAction func moveToTip(sender: UIButton) {
-        fpc.move(to: .tip, animated: true)
-    }
-    @IBAction func moveToHidden(sender: UIButton) {
-        fpc.move(to: .hidden, animated: true)
-    }
-    @IBAction func updateLayout(_ sender: Any) {
-        isNewlayout = !isNewlayout
-        UIView.animate(withDuration: 0.5) {
-            self.fpc.layout = (self.isNewlayout) ? ModalSecondLayout() : FloatingPanelBottomLayout()
-            self.fpc.invalidateLayout()
-        }
-    }
-
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
-        return (isNewlayout) ? ModalSecondLayout() : FloatingPanelBottomLayout()
-    }
-}
-
-class ModalSecondLayout: FloatingPanelLayout {
-    var position: FloatingPanelPosition = .bottom
-    var initialState: FloatingPanelState { .half }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
-}
-
-class TabBarViewController: UITabBarController {}
-
-class TabBarContentViewController: UIViewController {
-    enum Tab3Mode {
-        case changeOffset
-        case changeAutoLayout
-        var label: String {
-            switch self {
-            case .changeAutoLayout: return "Use AutoLayout(OK)"
-            case .changeOffset: return "Use ContentOffset(NG)"
-            }
-        }
-    }
-    lazy var fpc = FloatingPanelController()
-    var consoleVC: DebugTextViewController!
-
-    var threeLayout: ThreeTabBarPanelLayout!
-    var tab3Mode: Tab3Mode = .changeAutoLayout
-    var switcherLabel: UILabel!
-
-    override func viewDidLoad() {
-        fpc.delegate = self
-
-        let appearance = SurfaceAppearance()
-        appearance.cornerRadius = 6.0
-        fpc.surfaceView.appearance = appearance
-
-        // Set a content view controller and track the scroll view
-        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
-        fpc.set(contentViewController: consoleVC)
-        consoleVC.textView.delegate = self // MUST call it before fpc.track(scrollView:)
-        fpc.track(scrollView: consoleVC.textView)
-        self.consoleVC = consoleVC
-
-        //  Add FloatingPanel to self.view
-        fpc.addPanel(toParent: self)
-
-
-        switch tabBarItem.tag {
-        case 1:
-            fpc.behavior = TwoTabBarPanelBehavior()
-        case 2:
-            let switcher = UISwitch()
-            fpc.view.addSubview(switcher)
-            switcher.translatesAutoresizingMaskIntoConstraints = false
-            NSLayoutConstraint.activate([
-                switcher.bottomAnchor.constraint(equalTo: fpc.surfaceView.topAnchor, constant: -16.0),
-                switcher.rightAnchor.constraint(equalTo: fpc.surfaceView.rightAnchor, constant: -16.0),
-                ])
-            switcher.isOn = true
-            switcher.tintColor = .white
-            switcher.backgroundColor = .white
-            switcher.layer.cornerRadius = 16.0
-            switcher.addTarget(self,
-                               action: #selector(changeTab3Mode(_:)),
-                               for: .valueChanged)
-            let label = UILabel()
-            label.text = tab3Mode.label
-            fpc.view.addSubview(label)
-            switcherLabel = label
-            label.translatesAutoresizingMaskIntoConstraints = false
-            NSLayoutConstraint.activate([
-                label.centerYAnchor.constraint(equalTo: switcher.centerYAnchor, constant: 0.0),
-                label.rightAnchor.constraint(equalTo: switcher.leftAnchor, constant: -16.0),
-                ])
-
-            // Turn off the mask instead of content inset change
-            consoleVC.textView.clipsToBounds = false
-        default:
-            break
-        }
-    }
-
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-        fpc.invalidateLayout()
-    }
-
-    // MARK: - Action
-
-    @IBAction func close(sender: UIButton) {
-        dismiss(animated: true, completion: nil)
-    }
-
-    // MARK: - Private
-
-    @objc
-    private func changeTab3Mode(_ sender: UISwitch) {
-        if sender.isOn {
-            tab3Mode = .changeAutoLayout
-        } else {
-            tab3Mode = .changeOffset
-        }
-        switcherLabel.text = tab3Mode.label
-    }
-}
-
-extension TabBarContentViewController: UITextViewDelegate {
-    func scrollViewDidScroll(_ scrollView: UIScrollView) {
-        guard self.tabBarItem.tag == 2 else { return }
-        // Reset an invalid content offset by a user after updating the layout
-        // of `consoleVC.textView`.
-        // NOTE: FloatingPanel doesn't implicitly reset the offset(i.e.
-        // Using KVO of `scrollView.contentOffset`). Because it can lead to an
-        // infinite loop if a user also resets a content offset as below and,
-        // in the situation, a user has to modify the library.
-        if fpc.state != .full, fpc.surfaceLocation.y > fpc.surfaceLocation(for: .full).y {
-            scrollView.contentOffset = .zero
-        }
-    }
-}
-
-extension TabBarContentViewController: FloatingPanelControllerDelegate {
-    // MARK: - FloatingPanel
-
-    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
-        switch self.tabBarItem.tag {
-        case 0:
-            return OneTabBarPanelLayout()
-        case 1:
-            return TwoTabBarPanelLayout()
-        case 2:
-            threeLayout = ThreeTabBarPanelLayout(parent: self)
-            return threeLayout
-        default:
-            return FloatingPanelBottomLayout()
-        }
-    }
-
-    func floatingPanelDidMove(_ vc: FloatingPanelController) {
-        guard self.tabBarItem.tag == 2 else { return }
-        switch tab3Mode {
-        case .changeAutoLayout:
-            /* Good solution: Manipulate top constraint */
-            assert(consoleVC.textViewTopConstraint != nil)
-            let safeAreaTop = vc.layoutInsets.top
-            if vc.surfaceLocation.y + threeLayout.topPadding < safeAreaTop {
-                consoleVC.textViewTopConstraint?.constant = min(safeAreaTop - vc.surfaceLocation.y,
-                                                                safeAreaTop)
-            } else {
-                consoleVC.textViewTopConstraint?.constant = threeLayout.topPadding
-            }
-        case .changeOffset:
-            /*
-             Bad solution: Manipulate scroll content inset
-
-             FloatingPanelController keeps a content offset in moving a panel
-             so that changing content inset or offset causes a buggy behavior.
-             */
-            guard let scrollView = consoleVC.textView else { return }
-            var insets = vc.adjustedContentInsets
-            if vc.surfaceView.frame.minY < vc.layoutInsets.top {
-                insets.top = vc.layoutInsets.top - vc.surfaceView.frame.minY
-            } else {
-                insets.top = 0.0
-            }
-            scrollView.contentInset = insets
-
-            if vc.surfaceView.frame.minY > 0 {
-                scrollView.contentOffset = CGPoint(x: 0.0,
-                                                   y: 0.0 - scrollView.contentInset.top)
-            }
-        }
-
-        if vc.surfaceLocation.y > vc.surfaceLocation(for: .half).y {
-            let progress = (vc.surfaceLocation.y - vc.surfaceLocation(for: .half).y)
-                / (vc.surfaceLocation(for: .tip).y - vc.surfaceLocation(for: .half).y)
-            threeLayout.leftConstraint.constant = max(min(progress, 1.0), 0.0) * threeLayout.sideMargin
-            threeLayout.rightConstraint.constant = -max(min(progress, 1.0), 0.0) * threeLayout.sideMargin
-        } else {
-            threeLayout.leftConstraint.constant = 0.0
-            threeLayout.rightConstraint.constant = 0.0
-        }
-    }
-}
-
-class OneTabBarPanelLayout: FloatingPanelLayout {
-    var initialState: FloatingPanelState { .tip }
-    var position: FloatingPanelPosition { .bottom }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 22.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
-}
-
-class TwoTabBarPanelLayout: FloatingPanelLayout {
-    var initialState: FloatingPanelState { .half }
-    var position: FloatingPanelPosition { .bottom }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0, edge: .bottom, referenceGuide: .safeArea)
-        ]
-    }
-}
-
-class TwoTabBarPanelBehavior: FloatingPanelBehavior {
-    func allowsRubberBanding(for edges: UIRectEdge) -> Bool {
-        return [UIRectEdge.top, UIRectEdge.bottom].contains(edges)
-    }
-}
-
-
-class ThreeTabBarPanelLayout: FloatingPanelLayout {
-    weak var parentVC: UIViewController!
-
-    var leftConstraint: NSLayoutConstraint!
-    var rightConstraint: NSLayoutConstraint!
-
-    let topPadding: CGFloat = 17.0
-    let sideMargin: CGFloat = 16.0
-
-    init(parent: UIViewController) {
-        parentVC = parent
-    }
-
-    var initialState: FloatingPanelState { .half }
-    var position: FloatingPanelPosition { .bottom }
-    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-        return [
-            .full: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
-            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0 + parentVC.layoutInsets.bottom, edge: .bottom, referenceGuide: .superview),
-            .tip: FloatingPanelLayoutAnchor(absoluteInset: 88.0 + parentVC.layoutInsets.bottom, edge: .bottom, referenceGuide: .superview),
-        ]
-    }
-
-    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
-        return 0.3
-    }
-
-    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
-        if #available(iOS 11.0, *) {
-            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0)
-            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0)
-        } else {
-            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0)
-            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0)
-        }
-        return [ leftConstraint, rightConstraint ]
-    }
-}
-
-class SettingsViewController: InspectableViewController {
-    @IBOutlet weak var largeTitlesSwicth: UISwitch!
-    @IBOutlet weak var translucentSwicth: UISwitch!
-    @IBOutlet weak var versionLabel: UILabel!
-
-    override func viewDidLoad() {
-        versionLabel.text = "Version: \(Bundle.main.infoDictionary?["CFBundleVersion"] ?? "--")"
-    }
-
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        if #available(iOS 11.0, *) {
-            let prefersLargeTitles = navigationController!.navigationBar.prefersLargeTitles
-            largeTitlesSwicth.setOn(prefersLargeTitles, animated: false)
-        } else {
-            largeTitlesSwicth.isEnabled = false
-        }
-        let isTranslucent = navigationController!.navigationBar.isTranslucent
-        translucentSwicth.setOn(isTranslucent, animated: false)
-    }
-
-    @IBAction func toggleLargeTitle(_ sender: UISwitch) {
-        if #available(iOS 11.0, *) {
-            navigationController?.navigationBar.prefersLargeTitles = sender.isOn
-        }
-    }
-    @IBAction func toggleTranslucent(_ sender: UISwitch) {
-        navigationController?.navigationBar.isTranslucent = sender.isOn
-    }
-}
-
-// MARK -: Multi Panel
-
-import WebKit
-final class MultiPanelController: FloatingPanelController, FloatingPanelControllerDelegate {
-
-    private final class FirstPanelContentViewController: UIViewController {
-
-        lazy var webView: WKWebView = WKWebView()
-
-        override func viewDidLoad() {
-            super.viewDidLoad()
-            view.addSubview(webView)
-            webView.frame = view.bounds
-            webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
-            webView.load(URLRequest(url: URL(string: "https://www.apple.com")!))
-
-            let vc = MultiSecondPanelController()
-            vc.setUpContent()
-            vc.addPanel(toParent: self)
-        }
-    }
-
-    private final class MultiSecondPanelController: FloatingPanelController {
-
-        private final class SecondPanelContentViewController: DebugTableViewController {}
-
-        func setUpContent() {
-            contentInsetAdjustmentBehavior = .never
-            let vc = SecondPanelContentViewController()
-            vc.loadViewIfNeeded()
-            vc.title = "Second Panel"
-            vc.buttonStackView.isHidden = true
-            let navigationController = UINavigationController(rootViewController: vc)
-            navigationController.navigationBar.barTintColor = .white
-            navigationController.navigationBar.titleTextAttributes = [
-                .foregroundColor: UIColor.black
-            ]
-            set(contentViewController: navigationController)
-            self.track(scrollView: vc.tableView)
-            surfaceView.containerMargins = .init(top: 24.0, left: 0.0, bottom: layoutInsets.bottom, right: 0.0)
-        }
-    }
-
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        layout = FirstViewLayout()
-        isRemovalInteractionEnabled = true
-
-        let vc = FirstPanelContentViewController()
-        set(contentViewController: vc)
-        track(scrollView: vc.webView.scrollView)
-    }
-
-    private final class FirstViewLayout: FloatingPanelLayout {
-        let position: FloatingPanelPosition = .bottom
-        let initialState: FloatingPanelState = .full
-        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-            return [
-                .full: FloatingPanelLayoutAnchor(absoluteInset: 40.0, edge: .top, referenceGuide: .superview)
-            ]
-        }
-    }
-}
-
-class ImageViewController: UIViewController {
-    class PanelLayout: FloatingPanelLayout {
-        weak var targetGuide: UILayoutGuide?
-        init(targetGuide: UILayoutGuide?) {
-            self.targetGuide = targetGuide
-        }
-        let position: FloatingPanelPosition = .bottom
-        let initialState: FloatingPanelState = .full
-        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
-            if #available(iOS 11.0, *), let targetGuide = targetGuide {
-                return [
-                    .full: FloatingPanelAdaptiveLayoutAnchor(absoluteOffset: 0,
-                                                             contentLayout: targetGuide,
-                                                             referenceGuide: .superview),
-                    .half: FloatingPanelAdaptiveLayoutAnchor(fractionalOffset: 0.5,
-                                                             contentLayout: targetGuide,
-                                                             referenceGuide: .superview)
-                ]
-            } else {
-                return [
-                    .full: FloatingPanelLayoutAnchor(absoluteInset: 500,
-                                                     edge: .bottom,
-                                                     referenceGuide: .superview)
-                ]
-            }
-        }
-    }
-
-    @IBOutlet weak var headerView: UIView!
-    @IBOutlet weak var footerView: UIView!
-    @IBOutlet weak var scrollView: UIScrollView!
-    @IBOutlet weak var stackView: UIStackView!
-
-    enum Mode {
-        case onlyImage
-        case withHeaderFooter
-    }
-
-    @available(iOS 11.0, *)
-    func layoutGuideFor(mode: Mode) -> UILayoutGuide {
-        switch mode {
-        case .onlyImage:
-            self.headerView.isHidden = true
-            self.footerView.isHidden = true
-            return scrollView.contentLayoutGuide
-        case .withHeaderFooter:
-            self.headerView.isHidden = false
-            self.footerView.isHidden = false
-            let guide = UILayoutGuide()
-            view.addLayoutGuide(guide)
-
-            NSLayoutConstraint.activate([
-                scrollView.heightAnchor.constraint(equalTo: scrollView.contentLayoutGuide.heightAnchor),
-
-                guide.topAnchor.constraint(equalTo: stackView.topAnchor),
-                guide.leftAnchor.constraint(equalTo: stackView.leftAnchor),
-                guide.bottomAnchor.constraint(equalTo: stackView.bottomAnchor),
-                guide.rightAnchor.constraint(equalTo: stackView.rightAnchor),
-            ])
-            return guide
-        }
-    }
-}
diff --git a/Examples/Samples/Sources/ViewControllers/DebugTableViewController.swift b/Examples/Samples/Sources/ViewControllers/DebugTableViewController.swift
new file mode 100644
index 0000000..dc31a9f
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/DebugTableViewController.swift
@@ -0,0 +1,272 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+class DebugTableViewController: InspectableViewController {
+    // MARK: - Views
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView(frame: .zero, style: .plain)
+        tableView.dataSource = self
+        tableView.delegate = self
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
+        return tableView
+    }()
+    lazy var buttonStackView: UIStackView = {
+        let stackView = UIStackView()
+        stackView.axis = .vertical
+        stackView.distribution = .fillEqually
+        stackView.alignment = .trailing
+        stackView.spacing = 10.0
+        return stackView
+    }()
+    private lazy var reorderButton: UIButton = {
+        let button = UIButton()
+        button.setTitle(Menu.reorder.rawValue, for: .normal)
+        button.setTitleColor(view.tintColor, for: .normal)
+        button.addTarget(self, action: #selector(reorderItems), for: .touchUpInside)
+        return button
+    }()
+    private lazy var trackingSwitchWrapper: UIStackView = {
+        let stackView = UIStackView()
+        stackView.axis = .horizontal
+        stackView.distribution = .fillProportionally
+        stackView.alignment = .center
+        stackView.spacing = 8.0
+        stackView.addArrangedSubview(trackingLabel)
+        stackView.addArrangedSubview(trackingSwitch)
+        return stackView
+    }()
+    private lazy var trackingLabel: UILabel = {
+        let label = UILabel()
+        label.text = "Tracking"
+        label.font = UIFont.systemFont(ofSize: 17.0, weight: .regular)
+        return label
+    }()
+    private lazy var trackingSwitch: UISwitch = {
+        let trackingSwitch = UISwitch()
+        trackingSwitch.isOn = true
+        trackingSwitch.addTarget(self, action: #selector(turnTrackingOn), for: .touchUpInside)
+        return trackingSwitch
+    }()
+
+    // MARK: - Properties
+
+    private lazy var items: [String] = {
+        let items = (0..<100).map { "Items \($0)" }
+        return Command.replace(items: items)
+    }()
+    private var itemHeight: CGFloat = 66.0
+
+    enum Menu: String, CaseIterable {
+        case turnOffTracking = "Tracking"
+        case reorder = "Reorder"
+    }
+
+    enum Command: Int, CaseIterable {
+        case animateScroll
+        case changeContentSize
+        case moveToFull
+        case moveToHalf
+        var text: String {
+            switch self {
+            case .animateScroll: return "Scroll in the middle"
+            case .changeContentSize: return "Change content size"
+            case .moveToFull: return "Move to Full"
+            case.moveToHalf: return "Move to Half"
+            }
+        }
+
+        static func replace(items: [String]) -> [String] {
+            return items.enumerated().map { (index, text) -> String in
+                if let action = Command(rawValue: index) {
+                    return "\(index). \(action.text)"
+                }
+                return text
+            }
+        }
+
+        func execute(for vc: DebugTableViewController) {
+            switch self {
+            case .animateScroll:
+                vc.animateScroll()
+            case .changeContentSize:
+                vc.changeContentSize()
+            case .moveToFull:
+                vc.moveToFull()
+            case .moveToHalf:
+                vc.moveToHalf()
+            }
+        }
+    }
+
+    // MARK: - Lifecycle
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        layoutTableView()
+        layoutMenuStackView()
+        setUpMenu()
+    }
+
+    private func layoutTableView() {
+        view.addSubview(tableView)
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            tableView.leftAnchor.constraint(equalTo: view.leftAnchor),
+            tableView.rightAnchor.constraint(equalTo: view.rightAnchor)
+            ])
+    }
+
+    private func layoutMenuStackView() {
+        view.addSubview(buttonStackView)
+        buttonStackView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            buttonStackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 22.0),
+            buttonStackView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -22.0),
+            ])
+    }
+
+    private func setUpMenu() {
+        for menu in Menu.allCases {
+            switch menu {
+            case .reorder:
+                buttonStackView.addArrangedSubview(reorderButton)
+            case .turnOffTracking:
+                buttonStackView.addArrangedSubview(trackingSwitchWrapper)
+            }
+        }
+    }
+
+    // MARK: - Menu
+    @objc
+    private func reorderItems() {
+        if reorderButton.titleLabel?.text == Menu.reorder.rawValue {
+            tableView.isEditing = true
+            reorderButton.setTitle("Cancel", for: .normal)
+        } else {
+            tableView.isEditing = false
+            reorderButton.setTitle(Menu.reorder.rawValue, for: .normal)
+        }
+    }
+
+    @objc
+    private func turnTrackingOn(_ sender: UISwitch) {
+        guard let fpc = self.parent as? FloatingPanelController else { return }
+        if sender.isOn {
+            fpc.track(scrollView: tableView)
+        } else {
+            fpc.untrack(scrollView: tableView)
+        }
+    }
+
+    // MARK: - Actions
+
+    private func execute(command: Command) {
+        command.execute(for: self)
+    }
+
+    @objc
+    private func animateScroll() {
+        tableView.scrollToRow(at: IndexPath(row: lround(Double(items.count) / 2.0),
+                                            section: 0),
+                              at: .top, animated: true)
+    }
+
+    @objc
+    private func changeContentSize() {
+        let actionSheet = UIAlertController(title: "Change content size", message: "", preferredStyle: .actionSheet)
+        actionSheet.addAction(UIAlertAction(title: "Large", style: .default, handler: { (_) in
+            self.itemHeight = 66.0
+            self.changeItems(100)
+        }))
+        actionSheet.addAction(UIAlertAction(title: "Match", style: .default, handler: { (_) in
+            switch self.tableView.bounds.height {
+            case 585: // iPhone 6,7,8
+                self.itemHeight = self.tableView.bounds.height / 13.0
+                self.changeItems(13)
+            case 656: // iPhone {6,7,8} Plus
+                self.itemHeight = self.tableView.bounds.height / 16.0
+                self.changeItems(16)
+            default: // iPhone X family
+                self.itemHeight = self.tableView.bounds.height / 12.0
+                self.changeItems(12)
+            }
+        }))
+        actionSheet.addAction(UIAlertAction(title: "Short", style: .default, handler: { (_) in
+            self.itemHeight = 66.0
+            self.changeItems(3)
+        }))
+
+        self.present(actionSheet, animated: true, completion: nil)
+    }
+
+    private func changeItems(_ count: Int) {
+        items = Command.replace(items: (0..<count).map{ "\($0). No action" })
+        tableView.reloadData()
+    }
+
+    @objc
+    private func moveToFull() {
+        (self.parent as! FloatingPanelController).move(to: .full, animated: true)
+    }
+
+    @objc
+    private func moveToHalf() {
+        (self.parent as! FloatingPanelController).move(to: .half, animated: true)
+    }
+
+    @objc
+    private func close(sender: UIButton) {
+        //  Remove FloatingPanel from a view
+        (self.parent as! FloatingPanelController).removePanelFromParent(animated: true, completion: nil)
+    }
+}
+
+extension DebugTableViewController: UITableViewDataSource {
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return items.count
+    }
+
+    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
+        return itemHeight
+    }
+
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        cell.textLabel?.text = items[indexPath.row]
+        return cell
+    }
+}
+
+extension DebugTableViewController: UITableViewDelegate {
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        print("TableView --- ", scrollView.contentOffset, scrollView.contentInset)
+    }
+
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        print("DebugTableViewController -- select row \(indexPath.row)")
+        guard let action = Command(rawValue: indexPath.row) else { return }
+        execute(command: action)
+    }
+
+    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
+        return [
+            UITableViewRowAction(style: .destructive, title: "Delete", handler: { (action, path) in
+                self.items.remove(at: path.row)
+                tableView.deleteRows(at: [path], with: .automatic)
+            }),
+        ]
+    }
+
+    func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
+        return true
+    }
+
+    func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
+        items.insert(items.remove(at: sourceIndexPath.row), at: destinationIndexPath.row)
+    }
+}
diff --git a/Examples/Samples/Sources/ViewControllers/DebugTextViewController.swift b/Examples/Samples/Sources/ViewControllers/DebugTextViewController.swift
new file mode 100644
index 0000000..d89418e
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/DebugTextViewController.swift
@@ -0,0 +1,44 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+final class DebugTextViewController: UIViewController, UITextViewDelegate {
+    @IBOutlet weak var textView: UITextView!
+    @IBOutlet weak var textViewTopConstraint: NSLayoutConstraint!
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        textView.delegate = self
+        print("viewDidLoad: TextView --- ", textView.contentOffset, textView.contentInset)
+
+        if #available(iOS 11.0, *) {
+            textView.contentInsetAdjustmentBehavior = .never
+        }
+    }
+
+    override func viewWillLayoutSubviews() {
+        print("viewWillLayoutSubviews: TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        print("viewDidLayoutSubviews: TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        print("TextView --- ", textView.contentOffset, textView.contentInset, textView.frame)
+    }
+
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        print("TextView --- ", scrollView.contentOffset, scrollView.contentInset)
+        if #available(iOS 11.0, *) {
+            print("TextView --- ", scrollView.adjustedContentInset)
+        }
+    }
+
+    @IBAction func close(sender: UIButton) {
+        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
+        dismiss(animated: true, completion: nil)
+    }
+}
diff --git a/Examples/Samples/Sources/ViewControllers/DetailViewController.swift b/Examples/Samples/Sources/ViewControllers/DetailViewController.swift
new file mode 100644
index 0000000..dceb324
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/DetailViewController.swift
@@ -0,0 +1,39 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class DetailViewController: InspectableViewController {
+    @IBOutlet weak var modeChangeView: UIStackView!
+    @IBOutlet weak var intrinsicHeightConstraint: NSLayoutConstraint!
+    @IBOutlet weak var closeButton: UIButton!
+    @IBAction func close(sender: UIButton) {
+        // (self.parent as? FloatingPanelController)?.removePanelFromParent(animated: true, completion: nil)
+        dismiss(animated: true, completion: nil)
+    }
+
+    @IBAction func buttonPressed(_ sender: UIButton) {
+        switch sender.titleLabel?.text {
+        case "Show":
+            performSegue(withIdentifier: "ShowSegue", sender: self)
+        case "Present Modally":
+            performSegue(withIdentifier: "PresentModallySegue", sender: self)
+        default:
+            break
+        }
+    }
+    @IBAction func modeChanged(_ sender: Any) {
+        guard let fpc = parent as? FloatingPanelController else { return }
+        fpc.contentMode = (fpc.contentMode == .static) ? .fitToBounds : .static
+    }
+
+    @IBAction func tapped(_ sender: Any) {
+        print("Detail panel is tapped!")
+    }
+    @IBAction func swipped(_ sender: Any) {
+        print("Detail panel is swipped!")
+    }
+    @IBAction func longPressed(_ sender: Any) {
+        print("Detail panel is longPressed!")
+    }
+}
diff --git a/Examples/Samples/Sources/ViewControllers/ImageViewController.swift b/Examples/Samples/Sources/ViewControllers/ImageViewController.swift
new file mode 100644
index 0000000..3aa2635
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/ImageViewController.swift
@@ -0,0 +1,69 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class ImageViewController: UIViewController {
+    class PanelLayout: FloatingPanelLayout {
+        weak var targetGuide: UILayoutGuide?
+        init(targetGuide: UILayoutGuide?) {
+            self.targetGuide = targetGuide
+        }
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .full
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            if #available(iOS 11.0, *), let targetGuide = targetGuide {
+                return [
+                    .full: FloatingPanelAdaptiveLayoutAnchor(absoluteOffset: 0,
+                                                             contentLayout: targetGuide,
+                                                             referenceGuide: .superview),
+                    .half: FloatingPanelAdaptiveLayoutAnchor(fractionalOffset: 0.5,
+                                                             contentLayout: targetGuide,
+                                                             referenceGuide: .superview)
+                ]
+            } else {
+                return [
+                    .full: FloatingPanelLayoutAnchor(absoluteInset: 500,
+                                                     edge: .bottom,
+                                                     referenceGuide: .superview)
+                ]
+            }
+        }
+    }
+
+    @IBOutlet weak var headerView: UIView!
+    @IBOutlet weak var footerView: UIView!
+    @IBOutlet weak var scrollView: UIScrollView!
+    @IBOutlet weak var stackView: UIStackView!
+
+    enum Mode {
+        case onlyImage
+        case withHeaderFooter
+    }
+
+    @available(iOS 11.0, *)
+    func layoutGuideFor(mode: Mode) -> UILayoutGuide {
+        switch mode {
+        case .onlyImage:
+            self.headerView.isHidden = true
+            self.footerView.isHidden = true
+            return scrollView.contentLayoutGuide
+        case .withHeaderFooter:
+            self.headerView.isHidden = false
+            self.footerView.isHidden = false
+            let guide = UILayoutGuide()
+            view.addLayoutGuide(guide)
+
+            NSLayoutConstraint.activate([
+                scrollView.heightAnchor.constraint(equalTo: scrollView.contentLayoutGuide.heightAnchor),
+
+                guide.topAnchor.constraint(equalTo: stackView.topAnchor),
+                guide.leftAnchor.constraint(equalTo: stackView.leftAnchor),
+                guide.bottomAnchor.constraint(equalTo: stackView.bottomAnchor),
+                guide.rightAnchor.constraint(equalTo: stackView.rightAnchor),
+            ])
+            return guide
+        }
+    }
+}
+
diff --git a/Examples/Samples/Sources/ViewControllers/InspectorViewController.swift b/Examples/Samples/Sources/ViewControllers/InspectorViewController.swift
new file mode 100644
index 0000000..9ad4556
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/InspectorViewController.swift
@@ -0,0 +1,48 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+class InspectableViewController: UIViewController {
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+        print(">>> Content View: viewWillLayoutSubviews", layoutInsets)
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        print(">>> Content View: viewDidLayoutSubviews", layoutInsets)
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        print(">>> Content View: viewWillAppear", layoutInsets)
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        print(">>> Content View: viewDidAppear", view.bounds, layoutInsets)
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        print(">>> Content View: viewWillDisappear")
+    }
+
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        print(">>> Content View: viewDidDisappear")
+    }
+
+    override func willMove(toParent parent: UIViewController?) {
+        super.willMove(toParent: parent)
+        print(">>> Content View: willMove(toParent: \(String(describing: parent))")
+    }
+
+    override func didMove(toParent parent: UIViewController?) {
+        super.didMove(toParent: parent)
+        print(">>> Content View: didMove(toParent: \(String(describing: parent))")
+    }
+    public override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+        print(">>> Content View: willTransition(to: \(newCollection), with: \(coordinator))", layoutInsets)
+    }
+}
diff --git a/Examples/Samples/Sources/ViewControllers/ModalViewController.swift b/Examples/Samples/Sources/ViewControllers/ModalViewController.swift
new file mode 100644
index 0000000..aafdb6b
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/ModalViewController.swift
@@ -0,0 +1,79 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class ModalViewController: UIViewController, FloatingPanelControllerDelegate {
+    var fpc: FloatingPanelController!
+    var consoleVC: DebugTextViewController!
+
+    @IBOutlet weak var safeAreaView: UIView!
+
+    var isNewlayout: Bool = false
+
+    override func viewDidLoad() {
+        // Initialize FloatingPanelController
+        fpc = FloatingPanelController()
+        fpc.delegate = self
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        fpc.surfaceView.appearance = appearance
+
+        // Set a content view controller and track the scroll view
+        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
+        fpc.set(contentViewController: consoleVC)
+        fpc.track(scrollView: consoleVC.textView)
+
+        self.consoleVC = consoleVC
+
+        //  Add FloatingPanel to self.view
+        fpc.addPanel(toParent: self, at: view.subviews.firstIndex(of: safeAreaView) ?? -1)
+    }
+
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        //  Remove FloatingPanel from a view
+        fpc.removePanelFromParent(animated: false)
+    }
+
+    @IBAction func close(sender: UIButton) {
+        dismiss(animated: true, completion: nil)
+    }
+
+    @IBAction func moveToFull(sender: UIButton) {
+        fpc.move(to: .full, animated: true)
+    }
+    @IBAction func moveToHalf(sender: UIButton) {
+        fpc.move(to: .half, animated: true)
+    }
+    @IBAction func moveToTip(sender: UIButton) {
+        fpc.move(to: .tip, animated: true)
+    }
+    @IBAction func moveToHidden(sender: UIButton) {
+        fpc.move(to: .hidden, animated: true)
+    }
+    @IBAction func updateLayout(_ sender: Any) {
+        isNewlayout = !isNewlayout
+        UIView.animate(withDuration: 0.5) {
+            self.fpc.layout = (self.isNewlayout) ? ModalSecondLayout() : FloatingPanelBottomLayout()
+            self.fpc.invalidateLayout()
+        }
+    }
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        return (isNewlayout) ? ModalSecondLayout() : FloatingPanelBottomLayout()
+    }
+
+    class ModalSecondLayout: FloatingPanelLayout {
+        var position: FloatingPanelPosition = .bottom
+        var initialState: FloatingPanelState { .half }
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            return [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+                .half: FloatingPanelLayoutAnchor(absoluteInset: 262, edge: .top, referenceGuide: .safeArea),
+                .tip: FloatingPanelLayoutAnchor(absoluteInset: 44.0, edge: .bottom, referenceGuide: .safeArea)
+            ]
+        }
+    }
+}
diff --git a/Examples/Samples/Sources/ViewControllers/MultiPanelController.swift b/Examples/Samples/Sources/ViewControllers/MultiPanelController.swift
new file mode 100644
index 0000000..4b2206c
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/MultiPanelController.swift
@@ -0,0 +1,67 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+import WebKit
+
+final class MultiPanelController: FloatingPanelController, FloatingPanelControllerDelegate {
+
+    private final class FirstPanelContentViewController: UIViewController {
+
+        lazy var webView: WKWebView = WKWebView()
+
+        override func viewDidLoad() {
+            super.viewDidLoad()
+            view.addSubview(webView)
+            webView.frame = view.bounds
+            webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+            webView.load(URLRequest(url: URL(string: "https://www.apple.com")!))
+
+            let vc = MultiSecondPanelController()
+            vc.setUpContent()
+            vc.addPanel(toParent: self)
+        }
+    }
+
+    private final class MultiSecondPanelController: FloatingPanelController {
+
+        private final class SecondPanelContentViewController: DebugTableViewController {}
+
+        func setUpContent() {
+            contentInsetAdjustmentBehavior = .never
+            let vc = SecondPanelContentViewController()
+            vc.loadViewIfNeeded()
+            vc.title = "Second Panel"
+            vc.buttonStackView.isHidden = true
+            let navigationController = UINavigationController(rootViewController: vc)
+            navigationController.navigationBar.barTintColor = .white
+            navigationController.navigationBar.titleTextAttributes = [
+                .foregroundColor: UIColor.black
+            ]
+            set(contentViewController: navigationController)
+            self.track(scrollView: vc.tableView)
+            surfaceView.containerMargins = .init(top: 24.0, left: 0.0, bottom: layoutInsets.bottom, right: 0.0)
+        }
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        layout = FirstViewLayout()
+        isRemovalInteractionEnabled = true
+
+        let vc = FirstPanelContentViewController()
+        set(contentViewController: vc)
+        track(scrollView: vc.webView.scrollView)
+    }
+
+    private final class FirstViewLayout: FloatingPanelLayout {
+        let position: FloatingPanelPosition = .bottom
+        let initialState: FloatingPanelState = .full
+        var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+            return [
+                .full: FloatingPanelLayoutAnchor(absoluteInset: 40.0, edge: .top, referenceGuide: .superview)
+            ]
+        }
+    }
+}
+
diff --git a/Examples/Samples/Sources/ViewControllers/NestedScrollViewController.swift b/Examples/Samples/Sources/ViewControllers/NestedScrollViewController.swift
new file mode 100644
index 0000000..d358d7b
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/NestedScrollViewController.swift
@@ -0,0 +1,18 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+final class NestedScrollViewController: UIViewController {
+    @IBOutlet weak var scrollView: UIScrollView!
+    @IBOutlet weak var nestedScrollView: UIScrollView!
+
+    @IBAction func longPressed(_ sender: Any) {
+        print("LongPressed!")
+    }
+    @IBAction func swipped(_ sender: Any) {
+        print("Swipped!")
+    }
+    @IBAction func tapped(_ sender: Any) {
+        print("Tapped!")
+    }
+}
diff --git a/Examples/Samples/Sources/ViewControllers/SettingsViewController.swift b/Examples/Samples/Sources/ViewControllers/SettingsViewController.swift
new file mode 100644
index 0000000..d11d0c2
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/SettingsViewController.swift
@@ -0,0 +1,36 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class SettingsViewController: InspectableViewController {
+    @IBOutlet weak var largeTitlesSwicth: UISwitch!
+    @IBOutlet weak var translucentSwicth: UISwitch!
+    @IBOutlet weak var versionLabel: UILabel!
+
+    override func viewDidLoad() {
+        versionLabel.text = "Version: \(Bundle.main.infoDictionary?["CFBundleVersion"] ?? "--")"
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        if #available(iOS 11.0, *) {
+            let prefersLargeTitles = navigationController!.navigationBar.prefersLargeTitles
+            largeTitlesSwicth.setOn(prefersLargeTitles, animated: false)
+        } else {
+            largeTitlesSwicth.isEnabled = false
+        }
+        let isTranslucent = navigationController!.navigationBar.isTranslucent
+        translucentSwicth.setOn(isTranslucent, animated: false)
+    }
+
+    @IBAction func toggleLargeTitle(_ sender: UISwitch) {
+        if #available(iOS 11.0, *) {
+            navigationController?.navigationBar.prefersLargeTitles = sender.isOn
+        }
+    }
+    @IBAction func toggleTranslucent(_ sender: UISwitch) {
+        navigationController?.navigationBar.isTranslucent = sender.isOn
+    }
+}
+
diff --git a/Examples/Samples/Sources/ViewControllers/TabBarViewController.swift b/Examples/Samples/Sources/ViewControllers/TabBarViewController.swift
new file mode 100644
index 0000000..4cbeded
--- /dev/null
+++ b/Examples/Samples/Sources/ViewControllers/TabBarViewController.swift
@@ -0,0 +1,248 @@
+// Copyright 2018-Present Shin Yamamoto. All rights reserved. MIT license.
+
+import UIKit
+import FloatingPanel
+
+final class TabBarViewController: UITabBarController {}
+
+final class TabBarContentViewController: UIViewController {
+    enum Tab3Mode {
+        case changeOffset
+        case changeAutoLayout
+        var label: String {
+            switch self {
+            case .changeAutoLayout: return "Use AutoLayout(OK)"
+            case .changeOffset: return "Use ContentOffset(NG)"
+            }
+        }
+    }
+    lazy var fpc = FloatingPanelController()
+    var consoleVC: DebugTextViewController!
+
+    var threeLayout: ThreeTabBarPanelLayout!
+    var tab3Mode: Tab3Mode = .changeAutoLayout
+    var switcherLabel: UILabel!
+
+    override func viewDidLoad() {
+        fpc.delegate = self
+
+        let appearance = SurfaceAppearance()
+        appearance.cornerRadius = 6.0
+        fpc.surfaceView.appearance = appearance
+
+        // Set a content view controller and track the scroll view
+        let consoleVC = storyboard?.instantiateViewController(withIdentifier: "ConsoleViewController") as! DebugTextViewController
+        fpc.set(contentViewController: consoleVC)
+        consoleVC.textView.delegate = self // MUST call it before fpc.track(scrollView:)
+        fpc.track(scrollView: consoleVC.textView)
+        self.consoleVC = consoleVC
+
+        //  Add FloatingPanel to self.view
+        fpc.addPanel(toParent: self)
+
+
+        switch tabBarItem.tag {
+        case 1:
+            fpc.behavior = TwoTabBarPanelBehavior()
+        case 2:
+            let switcher = UISwitch()
+            fpc.view.addSubview(switcher)
+            switcher.translatesAutoresizingMaskIntoConstraints = false
+            NSLayoutConstraint.activate([
+                switcher.bottomAnchor.constraint(equalTo: fpc.surfaceView.topAnchor, constant: -16.0),
+                switcher.rightAnchor.constraint(equalTo: fpc.surfaceView.rightAnchor, constant: -16.0),
+                ])
+            switcher.isOn = true
+            switcher.tintColor = .white
+            switcher.backgroundColor = .white
+            switcher.layer.cornerRadius = 16.0
+            switcher.addTarget(self,
+                               action: #selector(changeTab3Mode(_:)),
+                               for: .valueChanged)
+            let label = UILabel()
+            label.text = tab3Mode.label
+            fpc.view.addSubview(label)
+            switcherLabel = label
+            label.translatesAutoresizingMaskIntoConstraints = false
+            NSLayoutConstraint.activate([
+                label.centerYAnchor.constraint(equalTo: switcher.centerYAnchor, constant: 0.0),
+                label.rightAnchor.constraint(equalTo: switcher.leftAnchor, constant: -16.0),
+                ])
+
+            // Turn off the mask instead of content inset change
+            consoleVC.textView.clipsToBounds = false
+        default:
+            break
+        }
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        fpc.invalidateLayout()
+    }
+
+    // MARK: - Action
+
+    @IBAction func close(sender: UIButton) {
+        dismiss(animated: true, completion: nil)
+    }
+
+    // MARK: - Private
+
+    @objc
+    private func changeTab3Mode(_ sender: UISwitch) {
+        if sender.isOn {
+            tab3Mode = .changeAutoLayout
+        } else {
+            tab3Mode = .changeOffset
+        }
+        switcherLabel.text = tab3Mode.label
+    }
+}
+
+extension TabBarContentViewController: UITextViewDelegate {
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        guard self.tabBarItem.tag == 2 else { return }
+        // Reset an invalid content offset by a user after updating the layout
+        // of `consoleVC.textView`.
+        // NOTE: FloatingPanel doesn't implicitly reset the offset(i.e.
+        // Using KVO of `scrollView.contentOffset`). Because it can lead to an
+        // infinite loop if a user also resets a content offset as below and,
+        // in the situation, a user has to modify the library.
+        if fpc.state != .full, fpc.surfaceLocation.y > fpc.surfaceLocation(for: .full).y {
+            scrollView.contentOffset = .zero
+        }
+    }
+}
+
+extension TabBarContentViewController: FloatingPanelControllerDelegate {
+    // MARK: - FloatingPanel
+
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout {
+        switch self.tabBarItem.tag {
+        case 0:
+            return OneTabBarPanelLayout()
+        case 1:
+            return TwoTabBarPanelLayout()
+        case 2:
+            threeLayout = ThreeTabBarPanelLayout(parent: self)
+            return threeLayout
+        default:
+            return FloatingPanelBottomLayout()
+        }
+    }
+
+    func floatingPanelDidMove(_ vc: FloatingPanelController) {
+        guard self.tabBarItem.tag == 2 else { return }
+        switch tab3Mode {
+        case .changeAutoLayout:
+            /* Good solution: Manipulate top constraint */
+            assert(consoleVC.textViewTopConstraint != nil)
+            let safeAreaTop = vc.layoutInsets.top
+            if vc.surfaceLocation.y + threeLayout.topPadding < safeAreaTop {
+                consoleVC.textViewTopConstraint?.constant = min(safeAreaTop - vc.surfaceLocation.y,
+                                                                safeAreaTop)
+            } else {
+                consoleVC.textViewTopConstraint?.constant = threeLayout.topPadding
+            }
+        case .changeOffset:
+            /*
+             Bad solution: Manipulate scroll content inset
+
+             FloatingPanelController keeps a content offset in moving a panel
+             so that changing content inset or offset causes a buggy behavior.
+             */
+            guard let scrollView = consoleVC.textView else { return }
+            var insets = vc.adjustedContentInsets
+            if vc.surfaceView.frame.minY < vc.layoutInsets.top {
+                insets.top = vc.layoutInsets.top - vc.surfaceView.frame.minY
+            } else {
+                insets.top = 0.0
+            }
+            scrollView.contentInset = insets
+
+            if vc.surfaceView.frame.minY > 0 {
+                scrollView.contentOffset = CGPoint(x: 0.0,
+                                                   y: 0.0 - scrollView.contentInset.top)
+            }
+        }
+
+        if vc.surfaceLocation.y > vc.surfaceLocation(for: .half).y {
+            let progress = (vc.surfaceLocation.y - vc.surfaceLocation(for: .half).y)
+                / (vc.surfaceLocation(for: .tip).y - vc.surfaceLocation(for: .half).y)
+            threeLayout.leftConstraint.constant = max(min(progress, 1.0), 0.0) * threeLayout.sideMargin
+            threeLayout.rightConstraint.constant = -max(min(progress, 1.0), 0.0) * threeLayout.sideMargin
+        } else {
+            threeLayout.leftConstraint.constant = 0.0
+            threeLayout.rightConstraint.constant = 0.0
+        }
+    }
+}
+
+class OneTabBarPanelLayout: FloatingPanelLayout {
+    var initialState: FloatingPanelState { .tip }
+    var position: FloatingPanelPosition { .bottom }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 16.0, edge: .top, referenceGuide: .safeArea),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 22.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class TwoTabBarPanelLayout: FloatingPanelLayout {
+    var initialState: FloatingPanelState { .half }
+    var position: FloatingPanelPosition { .bottom }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 100.0, edge: .top, referenceGuide: .safeArea),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0, edge: .bottom, referenceGuide: .safeArea)
+        ]
+    }
+}
+
+class TwoTabBarPanelBehavior: FloatingPanelBehavior {
+    func allowsRubberBanding(for edges: UIRectEdge) -> Bool {
+        return [UIRectEdge.top, UIRectEdge.bottom].contains(edges)
+    }
+}
+
+
+class ThreeTabBarPanelLayout: FloatingPanelLayout {
+    weak var parentVC: UIViewController!
+
+    var leftConstraint: NSLayoutConstraint!
+    var rightConstraint: NSLayoutConstraint!
+
+    let topPadding: CGFloat = 17.0
+    let sideMargin: CGFloat = 16.0
+
+    init(parent: UIViewController) {
+        parentVC = parent
+    }
+
+    var initialState: FloatingPanelState { .half }
+    var position: FloatingPanelPosition { .bottom }
+    var anchors: [FloatingPanelState : FloatingPanelLayoutAnchoring] {
+        return [
+            .full: FloatingPanelLayoutAnchor(absoluteInset: 0.0, edge: .top, referenceGuide: .superview),
+            .half: FloatingPanelLayoutAnchor(absoluteInset: 261.0 + parentVC.layoutInsets.bottom, edge: .bottom, referenceGuide: .superview),
+            .tip: FloatingPanelLayoutAnchor(absoluteInset: 88.0 + parentVC.layoutInsets.bottom, edge: .bottom, referenceGuide: .superview),
+        ]
+    }
+
+    func backdropAlpha(for state: FloatingPanelState) -> CGFloat {
+        return 0.3
+    }
+
+    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
+        if #available(iOS 11.0, *) {
+            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0)
+            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0)
+        } else {
+            leftConstraint = surfaceView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0)
+            rightConstraint = surfaceView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0)
+        }
+        return [ leftConstraint, rightConstraint ]
+    }
+}