Release v1.6.2

Merge pull request #231 from SCENEE/prevent-found-nil-error
Prevent 'unexpectedly found nil' fatal error
2019-07-10 18:55:09 +09:00 · 2019-07-09 21:53:40 +09:00 · 2019-07-09 20:06:16 +09:00 · 2019-07-03 14:24:47 +09:00 · 2019-07-03 11:46:45 +09:00 · 2019-07-03 11:46:45 +09:00
34 changed files with 2321 additions and 660 deletions
@@ -0,0 +1,27 @@
+> Please fill out this template appropriately when filing a bug report.
+>
+> Please remove this line and everything above it before submitting.
+
+### Short description
+
+### Expected behavior
+
+### Actual behavior
+
+### Steps to reproduce
+
+**Code example that reproduces the issue**
+
+### Environment
+
+**Library version**
+
+**Installation method**
+
+- [ ] CocoaPods
+- [ ] Carthage
+- [ ] Git submodules
+
+**iOS version(s)**
+
+**Xcode version**
@@ -22,6 +22,7 @@ xcuserdata/
 *.moved-aside
 *.xccheckout
 *.xcscmblueprint
+*.xcsettings

 ## Obj-C/Swift specific
 *.hmap
@@ -1,8 +1,7 @@
-language: swift
+language: objective-c
 branches:
  only:
    - master
-    - next
 cache:
  directories:
  - /usr/local/Homebrew
@@ -13,43 +12,51 @@ env:
  global:
  - LANG=en_US.UTF-8
  - LC_ALL=en_US.UTF-8
-skip_cleanup: true
 jobs:
  include:
-  - stage: Build framework(swift 4.1)
+  - stage: "Builds"
    osx_image: xcode9.4
-    script:
-    - xcodebuild -scheme FloatingPanel clean build
-
-  - stage: Build framework(swift 4.2)
+    script: xcodebuild -scheme FloatingPanel SWIFT_VERSION=4.1 clean build
+    name: "Swift 4.1"
+  - script: xcodebuild -scheme FloatingPanel SWIFT_VERSION=4.2 clean build
    osx_image: xcode10
-    script:
-    - xcodebuild -scheme FloatingPanel clean build
+    name: "Swift 4.2"
+  - script: xcodebuild -scheme FloatingPanel SWIFT_VERSION=5.0 clean build
+    osx_image: xcode10.2
+    name: "Swift 5.0"
+
+  - stage: "Tests"
+    osx_image: xcode10.2
+    script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=10.3.1,name=iPhone SE'
+    name: "iPhone SE (iOS 10.3)"
+  - script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=11.4,name=iPhone 7'
+    osx_image: xcode10.2
+    name: "iPhone 7 (iOS 11.4)"
+  - script: xcodebuild clean test -scheme FloatingPanel -workspace FloatingPanel.xcworkspace -destination 'platform=iOS Simulator,OS=12.2,name=iPhone X'
+    osx_image: xcode10.2
+    name: "iPhone X (iOS 12.2)"

  - stage: Carthage
-    osx_image: xcode10
+    osx_image: xcode10.2
    before_install:
    - brew update
    - brew outdated carthage || brew upgrade carthage
    script:
    - carthage build --no-skip-current

-  - stage: Podspec
-    osx_image: xcode10
+  - stage: CocoaPods
+    osx_image: xcode10.2
    script:
    - pod spec lint
+    - pod lib lint

-  - stage: Build maps example
-    osx_image: xcode10
-    script:
-    - xcodebuild -scheme Maps -sdk iphonesimulator clean build
-
-  - stage: Build stocks example
-    osx_image: xcode10
-    script:
-    - xcodebuild -scheme Stocks -sdk iphonesimulator clean build
-
-  - stage: Build samples example
-    osx_image: xcode10
-    script:
-    - xcodebuild -scheme Samples -sdk iphonesimulator clean build
+  - stage: Build examples
+    osx_image: xcode10.2
+    script: xcodebuild -scheme Maps -sdk iphonesimulator clean build
+    name: "Maps"
+  - script: xcodebuild -scheme Stocks -sdk iphonesimulator clean build
+    osx_image: xcode10.2
+    name: "Stocks"
+  - script: xcodebuild -scheme Samples -sdk iphonesimulator clean build
+    osx_image: xcode10.2
+    name: "Samples"
@@ -312,7 +312,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -331,7 +331,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -21,7 +21,11 @@ class ViewController: UIViewController, MKMapViewDelegate, UISearchBarDelegate,

        // Initialize FloatingPanelController and add the view
        fpc.surfaceView.backgroundColor = .clear
-        fpc.surfaceView.cornerRadius = 9.0
+        if #available(iOS 11, *) {
+            fpc.surfaceView.cornerRadius = 9.0
+        } else {
+            fpc.surfaceView.cornerRadius = 0.0
+        }
        fpc.surfaceView.shadowHidden = false

        searchVC = storyboard?.instantiateViewController(withIdentifier: "SearchPanel") as? SearchPanelViewController
@@ -135,7 +139,10 @@ class SearchPanelViewController: UIViewController, UITableViewDataSource, UITabl
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var visualEffectView: UIVisualEffectView!
-    
+
+    // For iOS 10 only
+    private lazy var shadowLayer: CAShapeLayer = CAShapeLayer()
+
    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.dataSource = self
@@ -150,9 +157,24 @@ class SearchPanelViewController: UIViewController, UITableViewDataSource, UITabl

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
-        if #available(iOS 10, *) {
+        if #available(iOS 11, *) {
+        } else {
+            // Exmaple: Add rounding corners on iOS 10
            visualEffectView.layer.cornerRadius = 9.0
            visualEffectView.clipsToBounds = true
+
+            // Exmaple: Add shadow manually on iOS 10
+            view.layer.insertSublayer(shadowLayer, at: 0)
+            let rect = visualEffectView.frame
+            let path = UIBezierPath(roundedRect: rect,
+                                    byRoundingCorners: [.topLeft, .topRight],
+                                    cornerRadii: CGSize(width: 9.0, height: 9.0))
+            shadowLayer.frame = visualEffectView.frame
+            shadowLayer.shadowPath = path.cgPath
+            shadowLayer.shadowColor = UIColor.black.cgColor
+            shadowLayer.shadowOffset = CGSize(width: 0.0, height: 1.0)
+            shadowLayer.shadowOpacity = 0.2
+            shadowLayer.shadowRadius = 3.0
        }
    }

@@ -499,7 +499,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelSample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -518,7 +518,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelSample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -162,7 +162,7 @@
            </objects>
            <point key="canvasLocation" x="708" y="-200"/>
        </scene>
-        <!--Item 2-->
+        <!--Layout 2-->
        <scene sceneID="lRc-OZ-sL4">
            <objects>
                <viewController id="RpE-lI-27a" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
@@ -170,12 +170,6 @@
                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
-                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Item 2" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="AiP-dx-mFn">
-                                <rect key="frame" x="163.66666666666666" y="395.66666666666669" width="48" height="21"/>
-                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                <nil key="textColor"/>
-                                <nil key="highlightedColor"/>
-                            </label>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IvG-yp-yzI">
                                <rect key="frame" x="20" y="44" width="39" height="30"/>
                                <state key="normal" title="Close"/>
@@ -188,19 +182,49 @@
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                        <constraints>
                            <constraint firstItem="IvG-yp-yzI" firstAttribute="top" secondItem="954-Dk-zvc" secondAttribute="top" id="18k-sV-PgT"/>
-                            <constraint firstItem="AiP-dx-mFn" firstAttribute="centerY" secondItem="JER-jz-KSq" secondAttribute="centerY" id="NUc-tM-0dN"/>
-                            <constraint firstItem="AiP-dx-mFn" firstAttribute="centerX" secondItem="954-Dk-zvc" secondAttribute="centerX" id="hwP-mu-Vmz"/>
+                            <constraint firstItem="954-Dk-zvc" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="IvG-yp-yzI" secondAttribute="trailing" id="mpr-u5-MZu"/>
                            <constraint firstItem="IvG-yp-yzI" firstAttribute="leading" secondItem="954-Dk-zvc" secondAttribute="leading" constant="20" id="pYt-jE-CTF"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="954-Dk-zvc"/>
                    </view>
-                    <tabBarItem key="tabBarItem" tag="1" title="Item 2" id="qb3-RB-B28"/>
+                    <tabBarItem key="tabBarItem" tag="1" title="Layout 2" id="qb3-RB-B28"/>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="NhZ-u5-Beh" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="-308" y="1546"/>
        </scene>
-        <!--Item 1-->
+        <!--Layout 3-->
+        <scene sceneID="r9h-Ql-gIv">
+            <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"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="NbG-e8-HdI">
+                                <rect key="frame" x="20" y="44" width="39" height="30"/>
+                                <state key="normal" title="Close"/>
+                                <connections>
+                                    <action selector="closeWithSender:" destination="pOk-Zm-vD9" eventType="touchUpInside" id="111-PD-Pop"/>
+                                    <action selector="closeWithSender:" destination="bYI-y3-Rzb" eventType="touchUpInside" id="1Rg-YG-TtU"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <constraints>
+                            <constraint firstItem="0ao-SI-QZW" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="NbG-e8-HdI" secondAttribute="trailing" id="K9F-6x-KWn"/>
+                            <constraint firstItem="NbG-e8-HdI" firstAttribute="top" secondItem="0ao-SI-QZW" secondAttribute="top" id="nsE-so-rTl"/>
+                            <constraint firstItem="NbG-e8-HdI" firstAttribute="leading" secondItem="0ao-SI-QZW" secondAttribute="leading" constant="20" id="sF4-Dm-aoY"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="0ao-SI-QZW"/>
+                    </view>
+                    <tabBarItem key="tabBarItem" tag="2" title="Layout 3" id="RJD-TF-Sdh"/>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="Oe3-FT-q1C" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="332" y="1546"/>
+        </scene>
+        <!--Layout 1-->
        <scene sceneID="m6X-j6-yBM">
            <objects>
                <viewController id="lto-Zc-Vtp" customClass="TabBarContentViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
@@ -208,12 +232,6 @@
                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
-                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Item 1" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="uoW-c8-9wx">
-                                <rect key="frame" x="164.66666666666666" y="395.66666666666669" width="46" height="21"/>
-                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                <nil key="textColor"/>
-                                <nil key="highlightedColor"/>
-                            </label>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eFN-tN-4Ct">
                                <rect key="frame" x="20" y="44" width="39" height="30"/>
                                <state key="normal" title="Close"/>
@@ -226,13 +244,12 @@
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                        <constraints>
                            <constraint firstItem="eFN-tN-4Ct" firstAttribute="leading" secondItem="5Ns-4l-Ufg" secondAttribute="leading" constant="20" id="5BT-yZ-EKe"/>
-                            <constraint firstItem="uoW-c8-9wx" firstAttribute="centerY" secondItem="ji9-Ez-N7i" secondAttribute="centerY" id="Nyw-Wt-78z"/>
+                            <constraint firstItem="5Ns-4l-Ufg" firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="eFN-tN-4Ct" secondAttribute="trailing" id="OzZ-Dz-RNF"/>
                            <constraint firstItem="eFN-tN-4Ct" firstAttribute="top" secondItem="5Ns-4l-Ufg" secondAttribute="top" id="hUV-3a-XkY"/>
-                            <constraint firstItem="uoW-c8-9wx" firstAttribute="centerX" secondItem="5Ns-4l-Ufg" secondAttribute="centerX" id="wDv-OH-7PX"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="5Ns-4l-Ufg"/>
                    </view>
-                    <tabBarItem key="tabBarItem" title="Item 1" id="HEV-kf-jxH"/>
+                    <tabBarItem key="tabBarItem" title="Layout 1" id="HEV-kf-jxH"/>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="bkL-bc-hZC" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
@@ -280,6 +297,7 @@
                    <connections>
                        <segue destination="lto-Zc-Vtp" kind="relationship" relationship="viewControllers" id="6hP-AH-YiH"/>
                        <segue destination="RpE-lI-27a" kind="relationship" relationship="viewControllers" id="g6X-Sq-uSW"/>
+                        <segue destination="pOk-Zm-vD9" kind="relationship" relationship="viewControllers" id="OPp-iO-iDK"/>
                    </connections>
                </tabBarController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="Z9x-EI-p2b" userLabel="First Responder" sceneMemberID="firstResponder"/>
@@ -654,6 +672,8 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
                    <size key="freeformSize" width="375" height="778"/>
                    <connections>
                        <outlet property="textView" destination="rN1-HL-YHv" id="gmr-Uf-jd8"/>
+                        <outlet property="textViewTopConstraint" destination="fiO-LL-nSC" id="Rum-TN-c2e"/>
+                        <outlet property="view" destination="9YG-0j-Zzg" id="jhb-eT-nEn"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="x1h-y1-h8q" userLabel="First Responder" sceneMemberID="firstResponder"/>
@@ -9,7 +9,7 @@
 import UIKit
 import FloatingPanel

-class SampleListViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, FloatingPanelControllerDelegate, FloatingPanelLayout {
+class SampleListViewController: UIViewController {
    @IBOutlet weak var tableView: UITableView!

    enum Menu: Int, CaseIterable {
@@ -19,9 +19,11 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        case showModal
        case showFloatingPanelModal
        case showTabBar
+        case showPageView
        case showNestedScrollView
        case showRemovablePanel
        case showIntrinsicView
+        case showContentInset

        var name: String {
            switch self {
@@ -31,9 +33,11 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
            case .showModal: return "Show Modal"
            case .showFloatingPanelModal: return "Show Floating Panel Modal"
            case .showTabBar: return "Show Tab Bar"
+            case .showPageView: return "Show Page View"
            case .showNestedScrollView: return "Show Nested ScrollView"
            case .showRemovablePanel: return "Show Removable Panel"
            case .showIntrinsicView: return "Show Intrinsic View"
+            case .showContentInset: return "Show with ContentInset"
            }
        }

@@ -45,9 +49,11 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
            case .showModal: return "ModalViewController"
            case .showFloatingPanelModal: return nil
            case .showTabBar: return "TabBarViewController"
+            case .showPageView: return nil
            case .showNestedScrollView: return "NestedScrollViewController"
            case .showRemovablePanel: return "DetailViewController"
            case .showIntrinsicView: return "IntrinsicViewController"
+            case .showContentInset: return nil
            }
        }
    }
@@ -61,6 +67,19 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
    var mainPanelObserves: [NSKeyValueObservation] = []
    var settingsObserves: [NSKeyValueObservation] = []

+    lazy var pages: [UIViewController] = {
+        let page1 = FloatingPanelController(delegate: self)
+        page1.view.backgroundColor = .blue
+        page1.show()
+        let page2 = FloatingPanelController(delegate: self)
+        page2.view.backgroundColor = .red
+        page2.show()
+        let page3 = FloatingPanelController(delegate: self)
+        page3.view.backgroundColor = .green
+        page3.show()
+        return [page1, page2, page3]
+    }()
+
    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.dataSource = self
@@ -113,6 +132,11 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable

        // 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
+            mainPanelVC.surfaceView.addGestureRecognizer(tapGesture)
        case .showRemovablePanel, .showIntrinsicView:
            mainPanelVC.isRemovalInteractionEnabled = true

@@ -143,8 +167,14 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        mainPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
    }

-    @objc func dismissDetailPanelVC()  {
-        detailPanelVC.removePanelFromParent(animated: true, completion: nil)
+    @objc
+    func handleSurface(tapGesture: UITapGestureRecognizer) {
+        switch mainPanelVC.position {
+        case .full:
+            mainPanelVC.move(to: .half, animated: true)
+        default:
+            mainPanelVC.move(to: .full, animated: true)
+        }
    }

    @objc func handleBackdrop(tapGesture: UITapGestureRecognizer) {
@@ -159,31 +189,6 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        }
    }

-    // MARK:- TableViewDatasource
-
-    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        if #available(iOS 11.0, *) {
-            if navigationController?.navigationBar.prefersLargeTitles == true {
-                return Menu.allCases.count + 30
-            } else {
-                return Menu.allCases.count
-            }
-        } else {
-            return Menu.allCases.count
-        }
-    }
-
-    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
-        if Menu.allCases.count > indexPath.row {
-            let menu = Menu.allCases[indexPath.row]
-            cell.textLabel?.text = menu.name
-        } else {
-            cell.textLabel?.text = "\(indexPath.row) row"
-        }
-        return cell
-    }
-
    // MARK:- Actions
    @IBAction func showDebugMenu(_ sender: UIBarButtonItem) {
        guard settingsPanelVC == nil else { return }
@@ -208,9 +213,34 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        //  Add FloatingPanel to self.view
        settingsPanelVC.addPanel(toParent: self, belowView: nil, animated: true)
    }
+}

-    // MARK:- TableViewDelegate
+extension SampleListViewController: UITableViewDataSource {
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        if #available(iOS 11.0, *) {
+            if navigationController?.navigationBar.prefersLargeTitles == true {
+                return Menu.allCases.count + 30
+            } else {
+                return Menu.allCases.count
+            }
+        } else {
+            return Menu.allCases.count
+        }
+    }

+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        if Menu.allCases.count > indexPath.row {
+            let menu = Menu.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 Menu.allCases.count > indexPath.row else { return }
        let menu = Menu.allCases[indexPath.row]
@@ -241,6 +271,22 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        case .showModal, .showTabBar:
            let modalVC = contentVC
            present(modalVC, animated: true, completion: nil)
+
+        case .showPageView:
+            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)
+            present(pageVC, animated: true, completion: nil)
+
        case .showFloatingPanelModal:
            let fpc = FloatingPanelController()
            let contentVC = self.storyboard!.instantiateViewController(withIdentifier: "DetailViewController")
@@ -253,6 +299,18 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
            fpc.isRemovalInteractionEnabled = true

            self.present(fpc, animated: true, completion: nil)
+            
+        case .showContentInset:
+            let contentViewController = UIViewController()
+            contentViewController.view.backgroundColor = .green
+            
+            let fpc = FloatingPanelController()
+            fpc.set(contentViewController: contentViewController)
+            fpc.surfaceView.contentInsets = .init(top: 20, left: 20, bottom: 0, right: 20)
+            
+            fpc.delegate = self
+            fpc.isRemovalInteractionEnabled = true
+            self.present(fpc, animated: true, completion: nil)
        default:
            detailPanelVC?.removePanelFromParent(animated: true, completion: nil)
            mainPanelVC?.removePanelFromParent(animated: true) {
@@ -261,6 +319,12 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        }
    }

+    @objc func dismissPresentedVC() {
+        self.presentedViewController?.dismiss(animated: true, completion: nil)
+    }
+}
+
+extension SampleListViewController: FloatingPanelControllerDelegate {
    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
        if vc == settingsPanelVC {
            return IntrinsicPanelLayout()
@@ -285,6 +349,9 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
        switch currentMenu {
        case .showNestedScrollView:
            return (vc.contentViewController as? NestedScrollViewController)?.nestedScrollView.gestureRecognizers?.contains(gestureRecognizer) ?? false
+        case .showPageView:
+            // Tips: Need to allow recognizing the pan gesture of UIPageViewController simultaneously.
+            return true
        default:
            return false
        }
@@ -298,7 +365,14 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
            break
        }
    }
+}

+/**
+ - Attention: `FloatingPanelLayout` must not be applied by the parent view
+ controller of a floating panel. But here `SampleListViewController` adopts it
+ purposely to check if the library prints an appropriate warning.
+ */
+extension SampleListViewController: FloatingPanelLayout {
    var initialPosition: FloatingPanelPosition {
        return .half
    }
@@ -313,6 +387,23 @@ class SampleListViewController: UIViewController, UITableViewDataSource, UITable
    }
 }

+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]
+    }
+}
+
 class IntrinsicPanelLayout: FloatingPanelIntrinsicLayout { }

 class RemovablePanelLayout: FloatingPanelIntrinsicLayout {
@@ -384,6 +475,7 @@ class NestedScrollViewController: UIViewController {

 class DebugTextViewController: UIViewController, UITextViewDelegate {
    @IBOutlet weak var textView: UITextView!
+    @IBOutlet weak var textViewTopConstraint: NSLayoutConstraint!

    override func viewDidLoad() {
        super.viewDidLoad()
@@ -467,7 +559,7 @@ class InspectableViewController: UIViewController {
    }
 }

-class DebugTableViewController: InspectableViewController, UITableViewDataSource, UITableViewDelegate {
+class DebugTableViewController: InspectableViewController {
    weak var tableView: UITableView!
    var items: [String] = []
    var itemHeight: CGFloat = 66.0
@@ -585,7 +677,9 @@ class DebugTableViewController: InspectableViewController, UITableViewDataSource
        //  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
    }
@@ -599,6 +693,12 @@ class DebugTableViewController: InspectableViewController, UITableViewDataSource
        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 [
@@ -725,10 +825,24 @@ class ModalSecondLayout: FloatingPanelLayout {

 class TabBarViewController: UITabBarController {}

-class TabBarContentViewController: UIViewController, FloatingPanelControllerDelegate {
+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)"
+            }
+        }
+    }
    var fpc: FloatingPanelController!
    var consoleVC: DebugTextViewController!

+    var threeLayout: ThreeTabBarPanelLayout!
+    var tab3Mode: Tab3Mode = .changeAutoLayout
+    var switcherLabel: UILabel!
+
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // Initialize FloatingPanelController
@@ -742,11 +856,47 @@ class TabBarContentViewController: UIViewController, FloatingPanelControllerDele
        // 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)
+
+
+        if tabBarItem.tag == 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
+        }
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        fpc.updateLayout()
    }

    override func viewWillDisappear(_ animated: Bool) {
@@ -755,19 +905,143 @@ class TabBarContentViewController: UIViewController, FloatingPanelControllerDele
        fpc.removePanelFromParent(animated: false)
    }

+    // 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.position != .full, fpc.surfaceView.frame.minY < fpc.originYOfSurface(for: .full) {
+            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 TwoTabBarPanel2Layout()
+            return TwoTabBarPanelLayout()
+        case 2:
+            threeLayout = ThreeTabBarPanelLayout(parent: self)
+            return threeLayout
        default:
            return nil
        }
    }

-    @IBAction func close(sender: UIButton) {
-        dismiss(animated: true, completion: nil)
+    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
+        switch self.tabBarItem.tag {
+        case 1:
+            return TwoTabBarPanelBehavior()
+        default:
+            return nil
+        }
+    }
+
+    func floatingPanelDidMove(_ vc: FloatingPanelController) {
+        guard self.tabBarItem.tag == 2 else { return }
+
+        switch tab3Mode {
+        case .changeAutoLayout:
+            /* Good solution: Manipulate top constraint */
+            assert(consoleVC.textViewTopConstraint != nil)
+            if vc.surfaceView.frame.minY + threeLayout.topPadding < vc.layoutInsets.top {
+                consoleVC.textViewTopConstraint?.constant = vc.layoutInsets.top - vc.surfaceView.frame.minY
+            } 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.surfaceView.frame.minY > vc.originYOfSurface(for: .half) {
+            let progress = (vc.surfaceView.frame.minY - vc.originYOfSurface(for: .half)) / (vc.originYOfSurface(for: .tip) - vc.originYOfSurface(for: .half))
+            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
+        }
+
+        vc.view.layoutIfNeeded() // MUST
+    }
+
+    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) {
+        guard self.tabBarItem.tag == 2 else { return }
+
+        switch tab3Mode {
+        case .changeAutoLayout:
+            /* Good Solution: Manipulate top constraint */
+            assert(consoleVC.textViewTopConstraint != nil)
+            consoleVC.textViewTopConstraint?.constant = (vc.position == .full) ? vc.layoutInsets.top : 17.0
+
+        case .changeOffset:
+            /* Bad Solution: Manipulate scroll content inset */
+            guard let scrollView = consoleVC.textView else { return }
+            var insets = vc.adjustedContentInsets
+            insets.top = (vc.position == .full) ? vc.layoutInsets.top : 0.0
+            scrollView.contentInset = insets
+            if scrollView.contentOffset.y - scrollView.contentInset.top < 0.0  {
+                scrollView.contentOffset = CGPoint(x: 0.0,
+                                                   y: 0.0 - scrollView.contentInset.top)
+            }
+        }
+
+        if vc.position == .tip {
+            threeLayout.leftConstraint.constant = threeLayout.sideMargin
+            threeLayout.rightConstraint.constant = -threeLayout.sideMargin
+        } else {
+            threeLayout.leftConstraint.constant = 0.0
+            threeLayout.rightConstraint.constant = 0.0
+        }
+        // Can call it, but it's not necessary because it will be also called
+        // by FloatingPanelController after the delegate method
+        vc.view.layoutIfNeeded()
    }
 }

@@ -804,26 +1078,80 @@ class OneTabBarPanelLayout: FloatingPanelLayout {
    }
 }

-class TwoTabBarPanel2Layout: FloatingPanelLayout {
+class TwoTabBarPanelLayout: FloatingPanelLayout {
    var initialPosition: FloatingPanelPosition {
        return .half
    }
    var supportedPositions: Set<FloatingPanelPosition> {
        return [.full, .half]
    }
+    var topInteractionBuffer: CGFloat {
+        return 100.0
+    }
    var bottomInteractionBuffer: CGFloat {
        return 261.0 - 22.0
    }

    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
        switch position {
-        case .full: return 16.0
+        case .full: return 100.0
        case .half: return 261.0
        default: return nil
        }
    }
 }

+class TwoTabBarPanelBehavior: FloatingPanelBehavior {
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
+        return (edge == .bottom || edge == .top)
+    }
+}
+
+
+class ThreeTabBarPanelLayout: FloatingPanelFullScreenLayout {
+    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 bottomInteractionBuffer: CGFloat = 44.0
+
+    var initialPosition: FloatingPanelPosition {
+        return .half
+    }
+    var supportedPositions: Set<FloatingPanelPosition> {
+        return [.full, .half, .tip]
+    }
+    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
+        switch position {
+        case .full: return 0.0
+        case .half: return 261.0 + parentVC.layoutInsets.bottom
+        case .tip: return 88.0 + parentVC.layoutInsets.bottom
+        default: return nil
+        }
+    }
+    func backdropAlphaFor(position: FloatingPanelPosition) -> 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!
@@ -832,7 +1160,7 @@ class SettingsViewController: InspectableViewController {
    override func viewDidLoad() {
        versionLabel.text = "Version: \(Bundle.main.infoDictionary?["CFBundleVersion"] ?? "--")"
    }
-    
+
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        if #available(iOS 11.0, *) {
@@ -312,7 +312,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Stocks;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -331,7 +331,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.Stocks;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|

  s.name                = "FloatingPanel"
-  s.version             = "1.3.2"
+  s.version             = "1.6.2"
  s.summary             = "FloatingPanel is a clean and easy-to-use UI component of a floating panel interface."
  s.description         = <<-DESC
 FloatingPanel is a clean and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app.
@@ -14,7 +14,6 @@ The new interface displays the related contents and utilities in parallel as a u
  s.source              = { :git => "https://github.com/SCENEE/FloatingPanel.git", :tag => "v#{s.version}" }
  s.source_files        = "Framework/Sources/*.swift"
  s.swift_version       = "4.0"
-  s.pod_target_xcconfig = { 'SWIFT_WHOLE_MODULE_OPTIMIZATION' => 'YES', 'APPLICATION_EXTENSION_API_ONLY' => 'YES' }

  s.framework           = "UIKit"

@@ -7,20 +7,26 @@
 	objects = {

 /* Begin PBXBuildFile section */
+		542753C622C49A6E00D17955 /* FloatingPanelLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542753C522C49A6E00D17955 /* FloatingPanelLayoutTests.swift */; };
+		542753C822C49A8F00D17955 /* Utils.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542753C722C49A8F00D17955 /* Utils.swift */; };
 		54352E9621A51A2500CBCA08 /* FloatingPanelTransitioning.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54352E9521A51A2500CBCA08 /* FloatingPanelTransitioning.swift */; };
 		54352E9821A521CA00CBCA08 /* FloatingPanelView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54352E9721A521CA00CBCA08 /* FloatingPanelView.swift */; };
 		5450EEE421646DF500135936 /* FloatingPanelBehavior.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5450EEE321646DF500135936 /* FloatingPanelBehavior.swift */; };
 		545DB9CB2151169500CA77B8 /* FloatingPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 545DB9C12151169500CA77B8 /* FloatingPanel.framework */; };
-		545DB9D02151169500CA77B8 /* ViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9CF2151169500CA77B8 /* ViewTests.swift */; };
-		545DB9D22151169500CA77B8 /* FloatingPanelController.h in Headers */ = {isa = PBXBuildFile; fileRef = 545DB9C42151169500CA77B8 /* FloatingPanelController.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		545DB9D02151169500CA77B8 /* FloatingPanelControllerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9CF2151169500CA77B8 /* FloatingPanelControllerTests.swift */; };
+		545DB9D22151169500CA77B8 /* FloatingPanel.h in Headers */ = {isa = PBXBuildFile; fileRef = 545DB9C42151169500CA77B8 /* FloatingPanel.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		545DB9DE215118C800CA77B8 /* UIExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9DD215118C800CA77B8 /* UIExtensions.swift */; };
 		545DB9E021511AC100CA77B8 /* FloatingPanelController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DB9DF21511AC100CA77B8 /* FloatingPanelController.swift */; };
 		545DBA2B2152383100CA77B8 /* GrabberHandleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 545DBA2A2152383100CA77B8 /* GrabberHandleView.swift */; };
+		54A6B6B122968B530077F348 /* FloatingPanelTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B022968B530077F348 /* FloatingPanelTests.swift */; };
+		54A6B6B622968F710077F348 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 54A6B6B522968F710077F348 /* LaunchScreen.storyboard */; };
+		54A6B6B82296A8520077F348 /* FloatingPanelSurfaceViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54A6B6B72296A8520077F348 /* FloatingPanelSurfaceViewTests.swift */; };
 		54ABD7AF216CCFF7002E6C13 /* Logger.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54ABD7AE216CCFF7002E6C13 /* Logger.swift */; };
 		54CDC5D3215B6D5A007D205C /* FloatingPanelSurfaceView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D2215B6D5A007D205C /* FloatingPanelSurfaceView.swift */; };
 		54CDC5D5215B6D8D007D205C /* FloatingPanelBackdropView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CDC5D4215B6D8D007D205C /* FloatingPanelBackdropView.swift */; };
 		54CFBFC3215CD045006B5735 /* FloatingPanelLayout.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC2215CD045006B5735 /* FloatingPanelLayout.swift */; };
 		54CFBFC5215CD09C006B5735 /* FloatingPanel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54CFBFC4215CD09C006B5735 /* FloatingPanel.swift */; };
+		54E740CD218AFD67005C1A34 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E740CC218AFD67005C1A34 /* AppDelegate.swift */; };
 /* End PBXBuildFile section */

 /* Begin PBXContainerItemProxy section */
@@ -31,26 +37,41 @@
 			remoteGlobalIDString = 545DB9C02151169500CA77B8;
 			remoteInfo = FloatingModalController;
 		};
+		54E740DC218AFE9F005C1A34 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 545DB9B82151169500CA77B8 /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 54E740C9218AFD67005C1A34;
+			remoteInfo = TestingHost;
+		};
 /* End PBXContainerItemProxy section */

 /* Begin PBXFileReference section */
+		542753C522C49A6E00D17955 /* FloatingPanelLayoutTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelLayoutTests.swift; sourceTree = "<group>"; };
+		542753C722C49A8F00D17955 /* Utils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Utils.swift; sourceTree = "<group>"; };
 		54352E9521A51A2500CBCA08 /* FloatingPanelTransitioning.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelTransitioning.swift; sourceTree = "<group>"; };
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-		545DB9C42151169500CA77B8 /* FloatingPanelController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = FloatingPanelController.h; sourceTree = "<group>"; };
+		545DB9C42151169500CA77B8 /* FloatingPanel.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = FloatingPanel.h; sourceTree = "<group>"; };
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-		545DB9CF2151169500CA77B8 /* ViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewTests.swift; sourceTree = "<group>"; };
+		545DB9CF2151169500CA77B8 /* FloatingPanelControllerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelControllerTests.swift; sourceTree = "<group>"; };
 		545DB9D12151169500CA77B8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
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 		545DBA2A2152383100CA77B8 /* GrabberHandleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GrabberHandleView.swift; sourceTree = "<group>"; };
+		54A6B6B022968B530077F348 /* FloatingPanelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelTests.swift; sourceTree = "<group>"; };
+		54A6B6B522968F710077F348 /* LaunchScreen.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; path = LaunchScreen.storyboard; sourceTree = "<group>"; };
+		54A6B6B72296A8520077F348 /* FloatingPanelSurfaceViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelSurfaceViewTests.swift; sourceTree = "<group>"; };
 		54ABD7AE216CCFF7002E6C13 /* Logger.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Logger.swift; sourceTree = "<group>"; };
 		54CDC5D2215B6D5A007D205C /* FloatingPanelSurfaceView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelSurfaceView.swift; sourceTree = "<group>"; };
 		54CDC5D4215B6D8D007D205C /* FloatingPanelBackdropView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelBackdropView.swift; sourceTree = "<group>"; };
 		54CFBFC2215CD045006B5735 /* FloatingPanelLayout.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanelLayout.swift; sourceTree = "<group>"; };
 		54CFBFC4215CD09C006B5735 /* FloatingPanel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FloatingPanel.swift; sourceTree = "<group>"; };
+		54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = FloatingPanelTesting.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		54E740CC218AFD67005C1A34 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		54E740D8218AFD6A005C1A34 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 /* End PBXFileReference section */

 /* Begin PBXFrameworksBuildPhase section */
@@ -69,6 +90,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		54E740C7218AFD67005C1A34 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXFrameworksBuildPhase section */

 /* Begin PBXGroup section */
@@ -77,6 +105,7 @@
 			children = (
 				545DB9C32151169500CA77B8 /* Sources */,
 				545DB9CE2151169500CA77B8 /* Tests */,
+				54E740CB218AFD67005C1A34 /* TestingApp */,
 				545DB9C22151169500CA77B8 /* Products */,
 			);
 			sourceTree = "<group>";
@@ -86,6 +115,7 @@
 			children = (
 				545DB9C12151169500CA77B8 /* FloatingPanel.framework */,
 				545DB9CA2151169500CA77B8 /* FloatingPanelTests.xctest */,
+				54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -94,7 +124,7 @@
 			isa = PBXGroup;
 			children = (
 				545DB9C52151169500CA77B8 /* Info.plist */,
-				545DB9C42151169500CA77B8 /* FloatingPanelController.h */,
+				545DB9C42151169500CA77B8 /* FloatingPanel.h */,
 				545DB9DF21511AC100CA77B8 /* FloatingPanelController.swift */,
 				54352E9521A51A2500CBCA08 /* FloatingPanelTransitioning.swift */,
 				54CFBFC4215CD09C006B5735 /* FloatingPanel.swift */,
@@ -113,12 +143,26 @@
 		545DB9CE2151169500CA77B8 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
-				545DB9CF2151169500CA77B8 /* ViewTests.swift */,
+				54A6B6B022968B530077F348 /* FloatingPanelTests.swift */,
+				542753C522C49A6E00D17955 /* FloatingPanelLayoutTests.swift */,
+				54A6B6B72296A8520077F348 /* FloatingPanelSurfaceViewTests.swift */,
+				545DB9CF2151169500CA77B8 /* FloatingPanelControllerTests.swift */,
+				542753C722C49A8F00D17955 /* Utils.swift */,
 				545DB9D12151169500CA77B8 /* Info.plist */,
 			);
 			path = Tests;
 			sourceTree = "<group>";
 		};
+		54E740CB218AFD67005C1A34 /* TestingApp */ = {
+			isa = PBXGroup;
+			children = (
+				54E740CC218AFD67005C1A34 /* AppDelegate.swift */,
+				54E740D8218AFD6A005C1A34 /* Info.plist */,
+				54A6B6B522968F710077F348 /* LaunchScreen.storyboard */,
+			);
+			path = TestingApp;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */

 /* Begin PBXHeadersBuildPhase section */
@@ -126,7 +170,7 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				545DB9D22151169500CA77B8 /* FloatingPanelController.h in Headers */,
+				545DB9D22151169500CA77B8 /* FloatingPanel.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -163,19 +207,37 @@
 			);
 			dependencies = (
 				545DB9CD2151169500CA77B8 /* PBXTargetDependency */,
+				54E740DD218AFE9F005C1A34 /* PBXTargetDependency */,
 			);
 			name = FloatingPanelTests;
 			productName = FloatingModalControllerTests;
 			productReference = 545DB9CA2151169500CA77B8 /* FloatingPanelTests.xctest */;
 			productType = "com.apple.product-type.bundle.unit-test";
 		};
+		54E740C9218AFD67005C1A34 /* TestingApp */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 54E740D9218AFD6A005C1A34 /* Build configuration list for PBXNativeTarget "TestingApp" */;
+			buildPhases = (
+				54E740C6218AFD67005C1A34 /* Sources */,
+				54E740C7218AFD67005C1A34 /* Frameworks */,
+				54E740C8218AFD67005C1A34 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = TestingApp;
+			productName = TestingHost;
+			productReference = 54E740CA218AFD67005C1A34 /* FloatingPanelTesting.app */;
+			productType = "com.apple.product-type.application";
+		};
 /* End PBXNativeTarget section */

 /* Begin PBXProject section */
 		545DB9B82151169500CA77B8 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastSwiftUpdateCheck = 1000;
+				LastSwiftUpdateCheck = 1010;
 				LastUpgradeCheck = 1000;
 				ORGANIZATIONNAME = scenee;
 				TargetAttributes = {
@@ -185,6 +247,10 @@
 					};
 					545DB9C92151169500CA77B8 = {
 						CreatedOnToolsVersion = 10.0;
+						TestTargetID = 54E740C9218AFD67005C1A34;
+					};
+					54E740C9218AFD67005C1A34 = {
+						CreatedOnToolsVersion = 10.1;
 					};
 				};
 			};
@@ -194,6 +260,7 @@
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
+				Base,
 			);
 			mainGroup = 545DB9B72151169500CA77B8;
 			productRefGroup = 545DB9C22151169500CA77B8 /* Products */;
@@ -202,6 +269,7 @@
 			targets = (
 				545DB9C02151169500CA77B8 /* FloatingPanel */,
 				545DB9C92151169500CA77B8 /* FloatingPanelTests */,
+				54E740C9218AFD67005C1A34 /* TestingApp */,
 			);
 		};
 /* End PBXProject section */
@@ -221,6 +289,14 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		54E740C8218AFD67005C1A34 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				54A6B6B622968F710077F348 /* LaunchScreen.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXResourcesBuildPhase section */

 /* Begin PBXSourcesBuildPhase section */
@@ -239,6 +315,7 @@
 				545DBA2B2152383100CA77B8 /* GrabberHandleView.swift in Sources */,
 				54352E9621A51A2500CBCA08 /* FloatingPanelTransitioning.swift in Sources */,
 				545DB9DE215118C800CA77B8 /* UIExtensions.swift in Sources */,
+				542753C822C49A8F00D17955 /* Utils.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -246,7 +323,18 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				545DB9D02151169500CA77B8 /* ViewTests.swift in Sources */,
+				54A6B6B122968B530077F348 /* FloatingPanelTests.swift in Sources */,
+				545DB9D02151169500CA77B8 /* FloatingPanelControllerTests.swift in Sources */,
+				542753C622C49A6E00D17955 /* FloatingPanelLayoutTests.swift in Sources */,
+				54A6B6B82296A8520077F348 /* FloatingPanelSurfaceViewTests.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		54E740C6218AFD67005C1A34 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				54E740CD218AFD67005C1A34 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -258,6 +346,11 @@
 			target = 545DB9C02151169500CA77B8 /* FloatingPanel */;
 			targetProxy = 545DB9CC2151169500CA77B8 /* PBXContainerItemProxy */;
 		};
+		54E740DD218AFE9F005C1A34 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 54E740C9218AFD67005C1A34 /* TestingApp */;
+			targetProxy = 54E740DC218AFE9F005C1A34 /* PBXContainerItemProxy */;
+		};
 /* End PBXTargetDependency section */

 /* Begin XCBuildConfiguration section */
@@ -386,6 +479,7 @@
 		545DB9D62151169500CA77B8 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
@@ -405,6 +499,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -414,6 +509,7 @@
 		545DB9D72151169500CA77B8 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
@@ -432,6 +528,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
+				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -442,7 +539,9 @@
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Tests/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -450,8 +549,9 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FloatingPanelTesting.app/FloatingPanelTesting";
 			};
 			name = Debug;
 		};
@@ -460,7 +560,9 @@
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Tests/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -468,11 +570,177 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FloatingPanelTesting.app/FloatingPanelTesting";
+			};
+			name = Release;
+		};
+		54E740DA218AFD6A005C1A34 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = TestingApp/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTesting;
+				PRODUCT_NAME = FloatingPanelTesting;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		54E740DB218AFD6A005C1A34 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = TestingApp/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTesting;
+				PRODUCT_NAME = FloatingPanelTesting;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
+		54E79ADF224F6C9800717BC6 /* Test */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				CURRENT_PROJECT_VERSION = 1;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				VERSIONING_SYSTEM = "apple-generic";
+				VERSION_INFO_PREFIX = "";
+			};
+			name = Test;
+		};
+		54E79AE0224F6C9800717BC6 /* Test */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_IDENTITY = "";
+				CODE_SIGN_STYLE = Automatic;
+				DEFINES_MODULE = YES;
+				DYLIB_COMPATIBILITY_VERSION = 1;
+				DYLIB_CURRENT_VERSION = 1;
+				DYLIB_INSTALL_NAME_BASE = "@rpath";
+				INFOPLIST_FILE = Sources/Info.plist;
+				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanel;
+				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				SKIP_INSTALL = YES;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG __FP_LOG";
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Test;
+		};
+		54E79AE1224F6C9800717BC6 /* Test */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = Tests/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingModalControllerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FloatingPanelTesting.app/FloatingPanelTesting";
+			};
+			name = Test;
+		};
+		54E8AC6A2286CFB6000C5A12 /* Test */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = TestingApp/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				LD_RUNPATH_SEARCH_PATHS = "@executable_path/Frameworks";
+				PRODUCT_BUNDLE_IDENTIFIER = com.scenee.FloatingPanelTesting;
+				PRODUCT_NAME = FloatingPanelTesting;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Test;
+		};
 /* End XCBuildConfiguration section */

 /* Begin XCConfigurationList section */
@@ -480,6 +748,7 @@
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				545DB9D32151169500CA77B8 /* Debug */,
+				54E79ADF224F6C9800717BC6 /* Test */,
 				545DB9D42151169500CA77B8 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
@@ -489,6 +758,7 @@
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				545DB9D62151169500CA77B8 /* Debug */,
+				54E79AE0224F6C9800717BC6 /* Test */,
 				545DB9D72151169500CA77B8 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
@@ -498,11 +768,22 @@
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				545DB9D92151169500CA77B8 /* Debug */,
+				54E79AE1224F6C9800717BC6 /* Test */,
 				545DB9DA2151169500CA77B8 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		54E740D9218AFD6A005C1A34 /* Build configuration list for PBXNativeTarget "TestingApp" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				54E740DA218AFD6A005C1A34 /* Debug */,
+				54E740DB218AFD6A005C1A34 /* Release */,
+				54E8AC6A2286CFB6000C5A12 /* Test */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 545DB9B82151169500CA77B8 /* Project object */;
@@ -23,12 +23,33 @@
      </BuildActionEntries>
   </BuildAction>
   <TestAction
-      buildConfiguration = "Debug"
+      buildConfiguration = "Test"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES"
+            testExecutionOrdering = "random">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "545DB9C92151169500CA77B8"
+               BuildableName = "FloatingPanelTests.xctest"
+               BlueprintName = "FloatingPanelTests"
+               ReferencedContainer = "container:FloatingPanel.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "545DB9C02151169500CA77B8"
+            BuildableName = "FloatingPanel.framework"
+            BlueprintName = "FloatingPanel"
+            ReferencedContainer = "container:FloatingPanel.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
      <AdditionalOptions>
      </AdditionalOptions>
   </TestAction>
@@ -6,9 +6,20 @@
 import UIKit

 public protocol FloatingPanelBehavior {
-    /// Returns the progress to redirect to the previous position
+    /// Asks the behavior if the floating panel should project a momentum of a user interaction to move the proposed position.
    ///
-    /// The progress is represented by a floating-point value between 0.0 and 1.0, inclusive, where 1.0 indicates the floating panel is impossible to move to the next posiiton. The default value is 0.5. Values less than 0.0 and greater than 1.0 are pinned to those limits.
+    /// The default implementation of this method returns true. This method is called for a layout to support all positions(tip, half and full).
+    /// Therefore, `proposedTargetPosition` can only be `FloatingPanelPosition.tip` or `FloatingPanelPosition.full`.
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, for proposedTargetPosition: FloatingPanelPosition) -> Bool
+
+    /// Returns a deceleration rate to calculate a target position projected a dragging momentum.
+    ///
+    /// The default implementation of this method returns the normal deceleration rate of UIScrollView.
+    func momentumProjectionRate(_ fpc: FloatingPanelController) -> CGFloat
+
+    /// Returns the progress to redirect to the previous position.
+    ///
+    /// The progress is represented by a floating-point value between 0.0 and 1.0, inclusive, where 1.0 indicates the floating panel is impossible to move to the next position. The default value is 0.5. Values less than 0.0 and greater than 1.0 are pinned to those limits.
    func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> CGFloat

    /// Returns a UIViewPropertyAnimator object to project a floating panel to a position on finger up if the user dragged.
@@ -46,13 +57,42 @@ public protocol FloatingPanelBehavior {
    ///
    /// Default is a spring animator with 1.0 damping ratio. This method is called when FloatingPanelController.isRemovalInteractionEnabled is true.
    func removalInteractionAnimator(_ fpc: FloatingPanelController, with velocity: CGVector) -> UIViewPropertyAnimator
+
+
+    /// Asks the behavior whether the rubber band effect is enabled in moving over a given edge of the surface view.
+    ///
+    /// This method allows the behavior to activate the rubber band effect to a given edge of the surface view. By default, the effect is disabled.
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool
 }

 public extension FloatingPanelBehavior {
+    func shouldProjectMomentum(_ fpc: FloatingPanelController, for proposedTargetPosition: FloatingPanelPosition) -> Bool {
+        switch (fpc.position, proposedTargetPosition) {
+        case (.full, .tip):
+            return false
+        case (.tip,  .full):
+            return false
+        default:
+            return true
+        }
+    }
+
+    func momentumProjectionRate(_ fpc: FloatingPanelController) -> CGFloat {
+        #if swift(>=4.2)
+        return UIScrollView.DecelerationRate.normal.rawValue
+        #else
+        return UIScrollViewDecelerationRateNormal
+        #endif
+    }
+
    func redirectionalProgress(_ fpc: FloatingPanelController, from: FloatingPanelPosition, to: FloatingPanelPosition) -> CGFloat {
        return 0.5
    }

+    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
+        return defaultBehavior.interactionAnimator(fpc, to: targetPosition, with: velocity)
+    }
+
    func addAnimator(_ fpc: FloatingPanelController, to: FloatingPanelPosition) -> UIViewPropertyAnimator {
        return UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
    }
@@ -80,10 +120,18 @@ public extension FloatingPanelBehavior {
                                        initialVelocity: velocity)
        return UIViewPropertyAnimator(duration: 0, timingParameters: timing)
    }
+
+    func allowsRubberBanding(for edge: UIRectEdge) -> Bool {
+        return false
+    }
 }

-class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
-    func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
+private let defaultBehavior = FloatingPanelDefaultBehavior()
+
+public class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
+    public init() { }
+
+    public func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
        let timing = timeingCurve(with: velocity)
        let animator = UIViewPropertyAnimator(duration: 0, timingParameters: timing)
        animator.isInterruptible = false
@@ -14,7 +14,10 @@ public protocol FloatingPanelControllerDelegate: class {

    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) // changed the settled position in the model layer

-    func floatingPanelDidMove(_ vc: FloatingPanelController) // any offset changes
+    /// Asks the delegate if dragging should begin by the pan gesture recognizer.
+    func floatingPanelShouldBeginDragging(_ vc: FloatingPanelController) -> Bool
+
+    func floatingPanelDidMove(_ vc: FloatingPanelController) // any surface frame changes in dragging

    // called on start of dragging (may require some time and or distance to move)
    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController)
@@ -28,7 +31,10 @@ public protocol FloatingPanelControllerDelegate: class {
    // called when its views are removed from a parent view controller
    func floatingPanelDidEndRemove(_ vc: FloatingPanelController)

-    func floatingPanel(_ vc: FloatingPanelController, shouldRecognizeSimultaneouslyWith gestureRecognizer: UIGestureRecognizer) -> Bool
+    /// Asks the delegate if the other gesture recognizer should be allowed to recognize the gesture in parallel.
+    ///
+    /// By default, any tap and long gesture recognizers are allowed to recognize gestures simultaneously.
+    func floatingPanel(_ vc: FloatingPanelController, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool
 }

 public extension FloatingPanelControllerDelegate {
@@ -39,6 +45,9 @@ public extension FloatingPanelControllerDelegate {
        return nil
    }
    func floatingPanelDidChangePosition(_ vc: FloatingPanelController) {}
+    func floatingPanelShouldBeginDragging(_ vc: FloatingPanelController) -> Bool {
+        return true
+    }
    func floatingPanelDidMove(_ vc: FloatingPanelController) {}
    func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {}
    func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {}
@@ -48,7 +57,9 @@ public extension FloatingPanelControllerDelegate {
    func floatingPanelDidEndDraggingToRemove(_ vc: FloatingPanelController, withVelocity velocity: CGPoint) {}
    func floatingPanelDidEndRemove(_ vc: FloatingPanelController) {}

-    func floatingPanel(_ vc: FloatingPanelController, shouldRecognizeSimultaneouslyWith gestureRecognizer: UIGestureRecognizer) -> Bool { return false }
+    func floatingPanel(_ vc: FloatingPanelController, shouldRecognizeSimultaneouslyWith gestureRecognizer: UIGestureRecognizer) -> Bool {
+        return false
+    }
 }


@@ -57,12 +68,16 @@ public enum FloatingPanelPosition: Int {
    case half
    case tip
    case hidden
+
+    static var allCases: [FloatingPanelPosition] {
+        return [.full, .half, .tip, .hidden]
+    }
 }

 ///
 /// A container view controller to display a floating panel to present contents in parallel as a user wants.
 ///
-public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UIGestureRecognizerDelegate {
+open class FloatingPanelController: UIViewController, UIScrollViewDelegate, UIGestureRecognizerDelegate {
    /// Constants indicating how safe area insets are added to the adjusted content inset.
    public enum ContentInsetAdjustmentBehavior: Int {
        case always
@@ -93,7 +108,7 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI

    // The underlying gesture recognizer for pan gestures
    public var panGestureRecognizer: UIPanGestureRecognizer {
-        return floatingPanel.panGesture
+        return floatingPanel.panGestureRecognizer
    }

    /// The current position of the floating panel controller's contents.
@@ -134,7 +149,8 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
    }
    private var _contentViewController: UIViewController?

-    private var floatingPanel: FloatingPanel!
+    private(set) var floatingPanel: FloatingPanel!
+    private var preSafeAreaInsets: UIEdgeInsets = .zero // Capture the latest one
    private var safeAreaInsetsObservation: NSKeyValueObservation?
    private let modalTransition = FloatingPanelModalTransition()

@@ -169,7 +185,7 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
    // MARK:- Overrides

    /// Creates the view that the controller manages.
-    override public func loadView() {
+    open override func loadView() {
        assert(self.storyboard == nil, "Storyboard isn't supported")

        let view = FloatingPanelPassThroughView()
@@ -184,16 +200,18 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
        self.view = view as UIView
    }

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

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

        if view.translatesAutoresizingMaskIntoConstraints {
@@ -202,13 +220,22 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
        }
    }

-    public override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+    open override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
        super.willTransition(to: newCollection, with: coordinator)
+        self.prepare(for: newCollection)
+    }

-        // Change layout for a new trait collection
+    open override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        safeAreaInsetsObservation = nil
+    }
+
+    // MARK:- Internals
+    func prepare(for newCollection: UITraitCollection) {
+        guard newCollection.shouldUpdateLayout(from: traitCollection) else { return }
+        // Change a layout & behavior for a new trait collection
        reloadLayout(for: newCollection)
-        setUpLayout()
-
+        activateLayout()
        floatingPanel.behavior = fetchBehavior(for: newCollection)
    }

@@ -228,17 +255,17 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
    }

    private func update(safeAreaInsets: UIEdgeInsets) {
-        // Don't re-layout the surface on SafeArea.Bottom enabled/disabled in interaction progress
        guard
-            floatingPanel.layoutAdapter.safeAreaInsets != safeAreaInsets,
-            self.floatingPanel.interactionInProgress == false
-        else { return }
+            preSafeAreaInsets != safeAreaInsets,
+            self.floatingPanel.isDecelerating == false
+            else { return }

        log.debug("Update safeAreaInsets", safeAreaInsets)
-        
-        floatingPanel.layoutAdapter.safeAreaInsets = safeAreaInsets

-        setUpLayout()
+        // Prevent an infinite loop on iOS 10: setUpLayout() -> viewDidLayoutSubviews() -> setUpLayout()
+        preSafeAreaInsets = safeAreaInsets
+
+        activateLayout()

        switch contentInsetAdjustmentBehavior {
        case .always:
@@ -252,9 +279,18 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
    private func reloadLayout(for traitCollection: UITraitCollection) {
        floatingPanel.layoutAdapter.layout = fetchLayout(for: traitCollection)
        floatingPanel.layoutAdapter.prepareLayout(in: self)
+
+        if let parent = self.parent {
+            if let layout = layout as? UIViewController, layout == parent {
+                log.warning("A memory leak will occur by a retain cycle because \(self) owns the parent view controller(\(parent)) as the layout object. Don't let the parent adopt FloatingPanelLayout.")
+            }
+            if let behavior = behavior as? UIViewController, behavior == parent {
+                log.warning("A memory leak will occur by a retain cycle because \(self) owns the parent view controller(\(parent)) as the behavior object. Don't let the parent adopt FloatingPanelBehavior.")
+            }
+        }
    }

-    private func setUpLayout() {
+    private func activateLayout() {
        // preserve the current content offset
        let contentOffset = scrollView?.contentOffset

@@ -270,7 +306,7 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
    public func show(animated: Bool = false, completion: (() -> Void)? = nil) {
        // Must apply the current layout here
        reloadLayout(for: traitCollection)
-        setUpLayout()
+        activateLayout()

        if #available(iOS 11.0, *) {
            // Must track the safeAreaInsets of `self.view` to update the layout.
@@ -279,9 +315,9 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
            // inset's update expectedly.
            // 2. The safe area top inset can be variable on the large title navigation bar(iOS11+).
            // That's why it needs the observation to keep `adjustedContentInsets` correct.
-            safeAreaInsetsObservation = self.observe(\.view.safeAreaInsets) { [weak self] (vc, chaneg) in
-                guard let `self` = self else { return }
-                self.update(safeAreaInsets: vc.layoutInsets)
+            safeAreaInsetsObservation = self.observe(\.view.safeAreaInsets, options: [.initial, .new, .old]) { [weak self] (vc, change) in
+                guard change.oldValue != change.newValue else { return }
+                self?.update(safeAreaInsets: vc.layoutInsets)
            }
        } else {
            // KVOs for topLayoutGuide & bottomLayoutGuide are not effective.
@@ -323,8 +359,11 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
            parent.view.addSubview(self.view)
        }

+        #if swift(>=4.2)
+        parent.addChild(self)
+        #else
        parent.addChildViewController(self)
-
+        #endif

        view.frame = parent.view.bounds // Needed for a correct safe area configuration
        view.translatesAutoresizingMaskIntoConstraints = false
@@ -337,7 +376,11 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI

        show(animated: animated) { [weak self] in
            guard let `self` = self else { return }
+            #if swift(>=4.2)
+            self.didMove(toParent: self)
+            #else
            self.didMove(toParentViewController: self)
+            #endif
        }
    }

@@ -353,9 +396,20 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI

        hide(animated: animated) { [weak self] in
            guard let `self` = self else { return }
+            #if swift(>=4.2)
+            self.willMove(toParent: nil)
+            #else
            self.willMove(toParentViewController: nil)
+            #endif
+
            self.view.removeFromSuperview()
+
+            #if swift(>=4.2)
+            self.removeFromParent()
+            #else
            self.removeFromParentViewController()
+            #endif
+
            completion?()
        }
    }
@@ -370,33 +424,53 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
        floatingPanel.move(to: to, animated: animated, completion: completion)
    }

-    /// Sets the view controller responsible for the content portion of the floating panel..
+    /// Sets the view controller responsible for the content portion of the floating panel.
    public func set(contentViewController: UIViewController?) {
        if let vc = _contentViewController {
+            #if swift(>=4.2)
+            vc.willMove(toParent: nil)
+            #else
            vc.willMove(toParentViewController: nil)
+            #endif
+
            vc.view.removeFromSuperview()
+
+            #if swift(>=4.2)
+            vc.removeFromParent()
+            #else
            vc.removeFromParentViewController()
+            #endif
        }

        if let vc = contentViewController {
+            #if swift(>=4.2)
+            addChild(vc)
+            #else
            addChildViewController(vc)
+            #endif
+
            let surfaceView = floatingPanel.surfaceView
            surfaceView.add(contentView: vc.view)
+
+            #if swift(>=4.2)
+            vc.didMove(toParent: self)
+            #else
            vc.didMove(toParentViewController: self)
+            #endif
        }

        _contentViewController = contentViewController
    }
-    
+
    @available(*, unavailable, renamed: "set(contentViewController:)")
-    public override func show(_ vc: UIViewController, sender: Any?) {
+    open  override func show(_ vc: UIViewController, sender: Any?) {
        if let target = self.parent?.targetViewController(forAction: #selector(UIViewController.show(_:sender:)), sender: sender) {
            target.show(vc, sender: sender)
        }
    }

    @available(*, unavailable, renamed: "set(contentViewController:)")
-    public override func showDetailViewController(_ vc: UIViewController, sender: Any?) {
+    open  override func showDetailViewController(_ vc: UIViewController, sender: Any?) {
        if let target = self.parent?.targetViewController(forAction: #selector(UIViewController.showDetailViewController(_:sender:)), sender: sender) {
            target.showDetailViewController(vc, sender: sender)
        }
@@ -406,23 +480,30 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI

    /// Tracks the specified scroll view to correspond with the scroll.
    ///
-    /// - Attention:
-    ///     The specified scroll view must be already assigned to the delegate property because the controller intermediates between the various delegate methods.
-    ///
-    public func track(scrollView: UIScrollView) {
-        floatingPanel.scrollView = scrollView
-        if scrollView.delegate !== floatingPanel {
-            floatingPanel.userScrollViewDelegate = scrollView.delegate
-            scrollView.delegate = floatingPanel
+    /// - Parameters:
+    ///     - scrollView: Specify a scroll view to continuously and seamlessly work in concert with interactions of the surface view or nil to cancel it.
+    public func track(scrollView: UIScrollView?) {
+        guard let scrollView = scrollView else {
+            floatingPanel.scrollView = nil
+            return
        }
+
+        floatingPanel.scrollView = scrollView
+
        switch contentInsetAdjustmentBehavior {
        case .always:
            if #available(iOS 11.0, *) {
                scrollView.contentInsetAdjustmentBehavior = .never
            } else {
+                #if swift(>=4.2)
+                children.forEach { (vc) in
+                    vc.automaticallyAdjustsScrollViewInsets = false
+                }
+                #else
                childViewControllers.forEach { (vc) in
                    vc.automaticallyAdjustsScrollViewInsets = false
                }
+                #endif
            }
        default:
            break
@@ -440,10 +521,10 @@ public class FloatingPanelController: UIViewController, UIScrollViewDelegate, UI
    /// animation block.
    public func updateLayout() {
        reloadLayout(for: traitCollection)
-        setUpLayout()
+        activateLayout()
    }

-    /// Returns the y-coordinate of the point at the origin of the surface view
+    /// Returns the y-coordinate of the point at the origin of the surface view.
    public func originYOfSurface(for pos: FloatingPanelPosition) -> CGFloat {
        switch pos {
        case .full:
@@ -476,10 +557,10 @@ extension FloatingPanelController {
 }

 public extension UIViewController {
-    @objc public func fp_original_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+    @objc func fp_original_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
        // Implementation will be replaced by IMP of self.dismiss(animated:completion:)
    }
-    @objc public func fp_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+    @objc func fp_dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
        // Call dismiss(animated:completion:) to a content view controller
        if let fpc = parent as? FloatingPanelController {
            if fpc.presentingViewController != nil {
@@ -5,12 +5,21 @@

 import UIKit

+/// FloatingPanelFullScreenLayout
+///
+/// Use the layout protocol if you configure full, half and tip insets from the superview, not the safe area.
+/// It can't be used with FloatingPanelIntrinsicLayout.
+public protocol FloatingPanelFullScreenLayout: FloatingPanelLayout { }
+
 /// FloatingPanelIntrinsicLayout
 ///
+/// Use the layout protocol if you want to layout a panel using the intrinsic height.
+/// It can't be used with FloatingPanelFullScreenLayout.
+///
 /// - Attention:
-///     `insetFor(position:)` must return `nil` for full position because the inset is determined automatically.
-///     You can customize insets only for half, tip and hidden positions
-///     on FloatingPanelIntrinsicLayout.
+///     `insetFor(position:)` must return `nil` for the full position. Because
+///     the inset is determined automatically by the intrinsic height.
+///     You can customize insets only for the half, tip and hidden positions.
 public protocol FloatingPanelIntrinsicLayout: FloatingPanelLayout { }

 public extension FloatingPanelIntrinsicLayout {
@@ -34,7 +43,7 @@ public protocol FloatingPanelLayout: class {
    /// Returns a set of FloatingPanelPosition objects to tell the applicable
    /// positions of the floating panel controller.
    ///
-    /// By default, it returns all position exepct for `hidden` position. Because
+    /// By default, it returns all position except for `hidden` position. Because
    /// it's always supported by `FloatingPanelController` so you don't need to return it.
    var supportedPositions: Set<FloatingPanelPosition> { get }

@@ -46,7 +55,7 @@ public protocol FloatingPanelLayout: class {

    /// Returns a CGFloat value to determine a Y coordinate of a floating panel for each position(full, half, tip and hidden).
    ///
-    /// Its returning value indicates a different inset for each positiion.
+    /// Its returning value indicates a different inset for each position.
    /// For full position, a top inset from a safe area in `FloatingPanelController.view`.
    /// For half or tip position, a bottom inset from the safe area.
    /// For hidden position, a bottom inset from `FloatingPanelController.view`.
@@ -72,7 +81,7 @@ public extension FloatingPanelLayout {
    var supportedPositions: Set<FloatingPanelPosition> {
        return Set([.full, .half, .tip])
    }
-    
+
    func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
        return [
            surfaceView.leftAnchor.constraint(equalTo: view.sideLayoutGuide.leftAnchor, constant: 0.0),
@@ -86,6 +95,8 @@ public extension FloatingPanelLayout {
 }

 public class FloatingPanelDefaultLayout: FloatingPanelLayout {
+    public init() { }
+
    public var initialPosition: FloatingPanelPosition {
        return .half
    }
@@ -101,6 +112,8 @@ public class FloatingPanelDefaultLayout: FloatingPanelLayout {
 }

 public class FloatingPanelDefaultLandscapeLayout: FloatingPanelLayout {
+    public init() { }
+
    public var initialPosition: FloatingPanelPosition {
        return .tip
    }
@@ -129,15 +142,20 @@ class FloatingPanelLayoutAdapter {
        }
    }

-    var safeAreaInsets: UIEdgeInsets = .zero
+    private var safeAreaInsets: UIEdgeInsets {
+        return vc?.layoutInsets ?? .zero
+    }
+
+    private var initialConst: CGFloat = 0.0

-    private var heightBuffer: CGFloat = 88.0 // For bounce
    private var fixedConstraints: [NSLayoutConstraint] = []
    private var fullConstraints: [NSLayoutConstraint] = []
    private var halfConstraints: [NSLayoutConstraint] = []
    private var tipConstraints: [NSLayoutConstraint] = []
    private var offConstraints: [NSLayoutConstraint] = []
-    private var heightConstraints: [NSLayoutConstraint] = []
+    private var interactiveTopConstraint: NSLayoutConstraint?
+
+    private var heightConstraint: NSLayoutConstraint?

    private var fullInset: CGFloat {
        if layout is FloatingPanelIntrinsicLayout {
@@ -162,11 +180,22 @@ class FloatingPanelLayoutAdapter {
        return supportedPositions
    }

+    var topMostState: FloatingPanelPosition {
+        return supportedPositions.sorted(by: { $0.rawValue < $1.rawValue }).first ?? .hidden
+    }
+
+    var bottomMostState: FloatingPanelPosition {
+        return supportedPositions.sorted(by: { $0.rawValue < $1.rawValue }).last ?? .hidden
+    }
+
    var topY: CGFloat {
        if supportedPositions.contains(.full) {
-            if layout is FloatingPanelIntrinsicLayout {
+            switch layout {
+            case is FloatingPanelIntrinsicLayout:
                return surfaceView.superview!.bounds.height - surfaceView.bounds.height
-            } else {
+            case is FloatingPanelFullScreenLayout:
+                return fullInset
+            default:
                return (safeAreaInsets.top + fullInset)
            }
        } else {
@@ -175,12 +204,20 @@ class FloatingPanelLayoutAdapter {
    }

    var middleY: CGFloat {
-        return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + halfInset)
+        if layout is FloatingPanelFullScreenLayout {
+            return surfaceView.superview!.bounds.height - halfInset
+        } else{
+            return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + halfInset)
+        }
    }

    var bottomY: CGFloat {
        if supportedPositions.contains(.tip) {
-            return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + tipInset)
+            if layout is FloatingPanelFullScreenLayout {
+                return surfaceView.superview!.bounds.height - tipInset
+            } else{
+                return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + tipInset)
+            }
        } else {
            return middleY
        }
@@ -190,12 +227,17 @@ class FloatingPanelLayoutAdapter {
        return surfaceView.superview!.bounds.height
    }

-    var safeAreaBottomY: CGFloat {
-        return surfaceView.superview!.bounds.height - (safeAreaInsets.bottom + hiddenInset)
+    var topMaxY: CGFloat {
+        return layout is FloatingPanelFullScreenLayout ? 0.0 : safeAreaInsets.top
    }

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

    var adjustedContentInsets: UIEdgeInsets {
        return UIEdgeInsets(top: 0.0,
@@ -226,7 +268,11 @@ class FloatingPanelLayoutAdapter {
    }

    func updateIntrinsicHeight() {
+        #if swift(>=4.2)
+        let fittingSize = UIView.layoutFittingCompressedSize
+        #else
        let fittingSize = UILayoutFittingCompressedSize
+        #endif
        var intrinsicHeight = surfaceView.contentView?.systemLayoutSizeFitting(fittingSize).height ?? 0.0
        var safeAreaBottom: CGFloat = 0.0
        if #available(iOS 11.0, *) {
@@ -262,50 +308,98 @@ class FloatingPanelLayoutAdapter {

        fixedConstraints = surfaceConstraints + backdropConstraints

-        // Flexible surface constarints for full, half, tip and off
-        if layout is FloatingPanelIntrinsicLayout {
+        // Flexible surface constraints for full, half, tip and off
+        let topAnchor: NSLayoutYAxisAnchor = {
+            if layout is FloatingPanelFullScreenLayout {
+                return vc.view.topAnchor
+            } else {
+                return vc.layoutGuide.topAnchor
+            }
+        }()
+
+        switch layout {
+        case is FloatingPanelIntrinsicLayout:
            // Set up on updateHeight()
-        } else {
+            break
+        default:
            fullConstraints = [
-                surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.topAnchor,
+                surfaceView.topAnchor.constraint(equalTo: topAnchor,
                                                 constant: fullInset),
            ]
        }
+
+        let bottomAnchor: NSLayoutYAxisAnchor = {
+            if layout is FloatingPanelFullScreenLayout {
+                return vc.view.bottomAnchor
+            } else {
+                return vc.layoutGuide.bottomAnchor
+            }
+        }()
+
        halfConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.bottomAnchor,
+            surfaceView.topAnchor.constraint(equalTo: bottomAnchor,
                                             constant: -halfInset),
        ]
        tipConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.bottomAnchor,
+            surfaceView.topAnchor.constraint(equalTo: bottomAnchor,
                                             constant: -tipInset),
        ]
+
        offConstraints = [
-            surfaceView.topAnchor.constraint(equalTo: vc.view.bottomAnchor,
+            surfaceView.topAnchor.constraint(equalTo:vc.view.bottomAnchor,
                                             constant: -hiddenInset),
        ]
    }

+    func startInteraction(at state: FloatingPanelPosition) {
+        NSLayoutConstraint.deactivate(fullConstraints + halfConstraints + tipConstraints + offConstraints)
+
+        let interactiveTopConstraint: NSLayoutConstraint
+        switch layout {
+        case is FloatingPanelIntrinsicLayout,
+             is FloatingPanelFullScreenLayout:
+            initialConst = surfaceView.frame.minY
+            interactiveTopConstraint = surfaceView.topAnchor.constraint(equalTo: vc.view.topAnchor,
+                                                                        constant: initialConst)
+        default:
+            initialConst = surfaceView.frame.minY - safeAreaInsets.top
+            interactiveTopConstraint = surfaceView.topAnchor.constraint(equalTo: vc.layoutGuide.topAnchor,
+                                                                        constant: initialConst)
+        }
+        NSLayoutConstraint.activate([interactiveTopConstraint])
+        self.interactiveTopConstraint = interactiveTopConstraint
+    }
+
+    func endInteraction(at state: FloatingPanelPosition) {
+        // Don't deactivate `interactiveTopConstraint` here because it leads to
+        // unsatisfiable constraints
+    }
+
    // The method is separated from prepareLayout(to:) for the rotation support
    // It must be called in FloatingPanelController.traitCollectionDidChange(_:)
    func updateHeight() {
        guard let vc = vc else { return }

-        NSLayoutConstraint.deactivate(heightConstraints)
-
-        if layout is FloatingPanelIntrinsicLayout {
-            updateIntrinsicHeight()
-            heightConstraints = [
-                surfaceView.heightAnchor.constraint(equalToConstant: intrinsicHeight + safeAreaInsets.bottom),
-            ]
-        } else {
-            heightConstraints = [
-                surfaceView.heightAnchor.constraint(equalTo: vc.view.heightAnchor,
-                                                    constant: -(safeAreaInsets.top + fullInset)),
-            ]
+        if let const = self.heightConstraint {
+            NSLayoutConstraint.deactivate([const])
        }
-        NSLayoutConstraint.activate(heightConstraints)

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

        if layout is FloatingPanelIntrinsicLayout {
            NSLayoutConstraint.deactivate(fullConstraints)
@@ -316,6 +410,59 @@ class FloatingPanelLayoutAdapter {
        }
    }

+    func updateInteractiveTopConstraint(diff: CGFloat, allowsTopBuffer: Bool, with behavior: FloatingPanelBehavior) {
+        defer {
+            surfaceView.superview!.layoutIfNeeded() // MUST call here to update `surfaceView.frame`
+        }
+
+        let topMostConst: CGFloat = {
+            var ret: CGFloat = 0.0
+            switch layout {
+            case is FloatingPanelIntrinsicLayout, is FloatingPanelFullScreenLayout:
+                ret = topY
+            default:
+                ret = topY - safeAreaInsets.top
+            }
+            return max(ret, 0.0) // The top boundary is equal to the related topAnchor.
+        }()
+        let bottomMostConst: CGFloat = {
+            var ret: CGFloat = 0.0
+            switch layout {
+            case is FloatingPanelIntrinsicLayout, is FloatingPanelFullScreenLayout:
+                ret = bottomY
+            default:
+                ret = bottomY - safeAreaInsets.top
+            }
+            return min(ret, bottomMaxY)
+        }()
+        let minConst = allowsTopBuffer ? topMostConst - layout.topInteractionBuffer : topMostConst
+        let maxConst = bottomMostConst + layout.bottomInteractionBuffer
+
+        var const = initialConst + diff
+
+        // Rubberbanding top buffer
+        if behavior.allowsRubberBanding(for: .top), const < topMostConst {
+            let buffer = topMostConst - const
+            const = topMostConst - rubberbandEffect(for: buffer, base: vc.view.bounds.height)
+        }
+
+        // Rubberbanding bottom buffer
+        if behavior.allowsRubberBanding(for: .bottom), const > bottomMostConst {
+            let buffer = const - bottomMostConst
+            const = bottomMostConst + rubberbandEffect(for: buffer, base: vc.view.bounds.height)
+        }
+
+        interactiveTopConstraint?.constant = max(minConst, min(maxConst, const))
+    }
+
+    // According to @chpwn's tweet: https://twitter.com/chpwn/status/285540192096497664
+    // x = distance from the edge
+    // c = constant value, UIScrollView uses 0.55
+    // d = dimension, either width or height
+    private func rubberbandEffect(for buffer: CGFloat, base: CGFloat) -> CGFloat {
+        return (1.0 - (1.0 / ((buffer * 0.55 / base) + 1.0))) * base
+    }
+
    func activateLayout(of state: FloatingPanelPosition) {
        defer {
            surfaceView.superview!.layoutIfNeeded()
@@ -325,6 +472,11 @@ class FloatingPanelLayoutAdapter {

        setBackdropAlpha(of: state)

+        // Must deactivate `interactiveTopConstraint` here
+        if let interactiveTopConstraint = interactiveTopConstraint {
+            NSLayoutConstraint.deactivate([interactiveTopConstraint])
+            self.interactiveTopConstraint = nil
+        }
        NSLayoutConstraint.activate(fixedConstraints)

        if supportedPositions.union([.hidden]).contains(state) == false {
@@ -344,7 +496,7 @@ class FloatingPanelLayoutAdapter {
        }
    }

-    func setBackdropAlpha(of target: FloatingPanelPosition) {
+    private func setBackdropAlpha(of target: FloatingPanelPosition) {
        if target == .hidden {
            self.backdropView.alpha = 0.0
        } else {
@@ -355,8 +507,8 @@ class FloatingPanelLayoutAdapter {
    private func checkLayoutConsistance() {
        // Verify layout configurations
        assert(supportedPositions.count > 0)
-        assert(supportedPositions.contains(layout.initialPosition),
-               "Does not include an initial potision(\(layout.initialPosition)) in supportedPositions(\(supportedPositions))")
+        assert(supportedPositions.union([.hidden]).contains(layout.initialPosition),
+               "Does not include an initial position (\(layout.initialPosition)) in supportedPositions (\(supportedPositions))")

        if layout is FloatingPanelIntrinsicLayout {
            assert(layout.insetFor(position: .full) == nil, "Return `nil` for full position on FloatingPanelIntrinsicLayout")
@@ -5,24 +5,45 @@

 import UIKit

-class FloatingPanelSurfaceContentView: UIView {}
-
 /// A view that presents a surface interface in a floating panel.
 public class FloatingPanelSurfaceView: UIView {

    /// A GrabberHandleView object displayed at the top of the surface view.
    ///
    /// To use a custom grabber handle, hide this and then add the custom one
-    /// to the surface view at appropirate coordinates.
-    public var grabberHandle: GrabberHandleView!
+    /// to the surface view at appropriate coordinates.
+    public let grabberHandle: GrabberHandleView = GrabberHandleView()
+
+    /// Offset of the grabber handle from the top
+    public var grabberTopPadding: CGFloat = 6.0 { didSet {
+        setNeedsUpdateConstraints()
+    } }

    /// The height of the grabber bar area
-    public static var topGrabberBarHeight: CGFloat {
-        return Default.grabberTopPadding * 2 + GrabberHandleView.Default.height // 17.0
+    public var topGrabberBarHeight: CGFloat {
+        return grabberTopPadding * 2 + grabberHandleHeight
    }

+    /// Grabber view width and height
+    public var grabberHandleWidth: CGFloat = 36.0 { didSet {
+        setNeedsUpdateConstraints()
+    } }
+    public var grabberHandleHeight: CGFloat = 5.0 { didSet {
+        setNeedsUpdateConstraints()
+    } }
+
    /// A root view of a content view controller
    public weak var contentView: UIView!
+    
+    /// The content insets specifying the insets around the content view.
+    ///
+    /// - important: Currently the `bottom` inset is ignored.
+    public var contentInsets: UIEdgeInsets = .zero {
+        didSet {
+            // Needs update constraints
+            self.setNeedsUpdateConstraints()
+        }
+    }

    private var color: UIColor? = .white { didSet { setNeedsLayout() } }
    var bottomOverflow: CGFloat = 0.0 // Must not call setNeedsLayout()
@@ -36,7 +57,10 @@ public class FloatingPanelSurfaceView: UIView {
    ///
    /// `self.contentView` is masked with the top rounded corners automatically on iOS 11 and later.
    /// On iOS 10, they are not automatically masked because of a UIVisualEffectView issue. See https://forums.developer.apple.com/thread/50854
-    public var cornerRadius: CGFloat = 0.0 { didSet { setNeedsLayout() } }
+    public var cornerRadius: CGFloat {
+        set { containerView.layer.cornerRadius = newValue; setNeedsLayout() }
+        get { return containerView.layer.cornerRadius }
+    }

    /// A Boolean indicating whether the surface shadow is displayed.
    public var shadowHidden: Bool = false  { didSet { setNeedsLayout() } }
@@ -59,103 +83,154 @@ public class FloatingPanelSurfaceView: UIView {
    /// The color of the surface border.
    public var borderWidth: CGFloat = 0.0  { didSet { setNeedsLayout() } }

-    private var backgroundLayer: CAShapeLayer!  { didSet { setNeedsLayout() } }
+    /// Offset of the container view from the top
+    public var containerTopInset: CGFloat = 0.0 { didSet {
+        setNeedsUpdateConstraints()
+    } }

-    private struct Default {
-        public static let grabberTopPadding: CGFloat = 6.0
-    }
+    /// The view presents an actual surface shape.
+    ///
+    /// It renders the background color, border line and top rounded corners,
+    /// specified by other properties. The reason why they're not be applied to
+    /// a content view directly is because it avoids any side-effects to the
+    /// content view.
+    public let containerView: UIView = UIView()
+
+    @available(*, unavailable, renamed: "containerView")
+    public var backgroundView: UIView!
+
+    private lazy var containerViewTopInsetConstraint: NSLayoutConstraint = containerView.topAnchor.constraint(equalTo: topAnchor, constant: containerTopInset)
+    private lazy var containerViewHeightConstraint: NSLayoutConstraint = containerView.heightAnchor.constraint(equalTo: heightAnchor, multiplier: 1.0)
+    
+    /// The content view top constraint
+    private var contentViewTopConstraint: NSLayoutConstraint?
+    /// The content view left constraint
+    private var contentViewLeftConstraint: NSLayoutConstraint?
+    /// The content right constraint
+    private var contentViewRightConstraint: NSLayoutConstraint?
+    /// The content height constraint
+    private var contentViewHeightConstraint: NSLayoutConstraint?
+
+    private lazy var grabberHandleWidthConstraint: NSLayoutConstraint = grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandleWidth)
+    private lazy var grabberHandleHeightConstraint: NSLayoutConstraint = grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandleHeight)
+    private lazy var grabberHandleTopConstraint: NSLayoutConstraint = grabberHandle.topAnchor.constraint(equalTo: topAnchor, constant: grabberTopPadding)

    override init(frame: CGRect) {
        super.init(frame: frame)
-        render()
+        addSubViews()
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
-        render()
+        addSubViews()
    }

-    private func render() {
+    private func addSubViews() {
        super.backgroundColor = .clear
        self.clipsToBounds = false

-        let backgroundLayer = CAShapeLayer()
-        layer.insertSublayer(backgroundLayer, at: 0)
-        self.backgroundLayer = backgroundLayer
+        addSubview(containerView)
+        containerView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            containerViewTopInsetConstraint,
+            containerView.leftAnchor.constraint(equalTo: leftAnchor, constant: 0.0),
+            containerView.rightAnchor.constraint(equalTo: rightAnchor, constant: 0.0),
+            containerViewHeightConstraint,
+            ])

-        let grabberHandle = GrabberHandleView()
        addSubview(grabberHandle)
-        self.grabberHandle = grabberHandle
-
        grabberHandle.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
-            grabberHandle.topAnchor.constraint(equalTo: topAnchor, constant: Default.grabberTopPadding),
-            grabberHandle.widthAnchor.constraint(equalToConstant: grabberHandle.frame.width),
-            grabberHandle.heightAnchor.constraint(equalToConstant: grabberHandle.frame.height),
+            grabberHandleWidthConstraint,
+            grabberHandleHeightConstraint,
+            grabberHandleTopConstraint,
            grabberHandle.centerXAnchor.constraint(equalTo: centerXAnchor),
            ])
    }

+    public override func updateConstraints() {
+        containerViewTopInsetConstraint.constant = containerTopInset
+        containerViewHeightConstraint.constant = bottomOverflow
+
+        contentViewTopConstraint?.constant = contentInsets.top
+        contentViewLeftConstraint?.constant = contentInsets.left
+        contentViewRightConstraint?.constant = contentInsets.right
+        contentViewHeightConstraint?.constant = -containerTopInset
+
+        grabberHandleTopConstraint.constant = grabberTopPadding
+        grabberHandleWidthConstraint.constant = grabberHandleWidth
+        grabberHandleHeightConstraint.constant = grabberHandleHeight
+
+        super.updateConstraints()
+    }
+
    public override func layoutSubviews() {
        super.layoutSubviews()
-        log.debug("SurfaceView frame", frame)
+        log.debug("surface view frame = \(frame)")

-        updateLayers()
-        updateContentViewMask()
+        containerView.backgroundColor = color

-        contentView?.layer.borderColor = borderColor?.cgColor
-        contentView?.layer.borderWidth = borderWidth
-        contentView?.frame = bounds
+        updateShadow()
+        updateCornerRadius()
+        updateBorder()
    }

-    private func updateLayers() {
-        log.debug("SurfaceView bounds", bounds)
-        
-        var rect = bounds
-        rect.size.height += bottomOverflow // Expand the height for overflow buffer
-        let path = UIBezierPath(roundedRect: rect,
-                                byRoundingCorners: [.topLeft, .topRight],
-                                cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
-        backgroundLayer.path = path.cgPath
-        backgroundLayer.fillColor = color?.cgColor
-		
+    private func updateShadow() {
        if shadowHidden == false {
-            layer.shadowColor = shadowColor.cgColor
-            layer.shadowOffset = shadowOffset
-            layer.shadowOpacity = shadowOpacity
-            layer.shadowRadius = shadowRadius
+            if #available(iOS 11, *) {
+                // For clear background. See also, https://github.com/SCENEE/FloatingPanel/pull/51.
+                layer.shadowColor = shadowColor.cgColor
+                layer.shadowOffset = shadowOffset
+                layer.shadowOpacity = shadowOpacity
+                layer.shadowRadius = shadowRadius
+            } else {
+                // Can't update `layer.shadow*` directly because of a UIVisualEffectView issue in iOS 10, https://forums.developer.apple.com/thread/50854
+                // Instead, a user should display shadow appropriately.
+            }
        }
    }

-    private func updateContentViewMask() {
+    private func updateCornerRadius() {
+        guard containerView.layer.cornerRadius != 0.0 else {
+            containerView.layer.masksToBounds = false
+            return
+        }
+        containerView.layer.masksToBounds = true
        if #available(iOS 11, *) {
            // Don't use `contentView.clipToBounds` because it prevents content view from expanding the height of a subview of it
-            // for the bottom overflow like Auto Layout settings of UIVisualEffectView in Main.storyborad of Example/Maps.
+            // for the bottom overflow like Auto Layout settings of UIVisualEffectView in Main.storyboard of Example/Maps.
            // Because the bottom of contentView must be fit to the bottom of a screen to work the `safeLayoutGuide` of a content VC.
-            let maskLayer = CAShapeLayer()
-            var rect = bounds
-            rect.size.height += bottomOverflow
-            let path = UIBezierPath(roundedRect: rect,
-                                    byRoundingCorners: [.topLeft, .topRight],
-                                    cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
-            maskLayer.path = path.cgPath
-            contentView?.layer.mask = maskLayer
+            containerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        } else {
-            // Don't use `contentView.layer.mask` because of a UIVisualEffectView issue in iOS 10, https://forums.developer.apple.com/thread/50854
-            // Instead, a user can mask the content view manually in an application.
+            // Can't use `containerView.layer.mask` because of a UIVisualEffectView issue in iOS 10, https://forums.developer.apple.com/thread/50854
+            // Instead, a user should display rounding corners appropriately.
        }
    }

+    private func updateBorder() {
+        containerView.layer.borderColor = borderColor?.cgColor
+        containerView.layer.borderWidth = borderWidth
+    }
+
    func add(contentView: UIView) {
-        insertSubview(contentView, belowSubview: grabberHandle)
+        containerView.addSubview(contentView)
        self.contentView = contentView
        /* contentView.frame = bounds */ // MUST NOT: Because the top safe area inset of a content VC will be incorrect.
        contentView.translatesAutoresizingMaskIntoConstraints = false
+
+        let topConstraint = contentView.topAnchor.constraint(equalTo: topAnchor, constant: contentInsets.top)
+        let leftConstraint = contentView.leftAnchor.constraint(equalTo: leftAnchor, constant: contentInsets.left)
+        let rightConstraint = rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: contentInsets.right)
+        let heightConstraint = contentView.heightAnchor.constraint(equalTo: heightAnchor, constant: -containerTopInset)
        NSLayoutConstraint.activate([
-            contentView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0),
-            contentView.leftAnchor.constraint(equalTo: leftAnchor, constant: 0.0),
-            contentView.rightAnchor.constraint(equalTo: rightAnchor, constant: 0.0),
-            contentView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0),
+            topConstraint,
+            leftConstraint,
+            rightConstraint,
+            heightConstraint,
            ])
+        self.contentViewTopConstraint = topConstraint
+        self.contentViewLeftConstraint = leftConstraint
+        self.contentViewRightConstraint = rightConstraint
+        self.contentViewHeightConstraint = heightConstraint
    }
 }
@@ -22,7 +22,11 @@ class FloatingPanelModalTransition: NSObject, UIViewControllerTransitioningDeleg
 }

 class FloatingPanelPresentationController: UIPresentationController {
-    override func presentationTransitionWillBegin() { }
+    override func presentationTransitionWillBegin() {
+        // Must call here even if duplicating on in containerViewWillLayoutSubviews()
+        // Because it let the floating panel present correctly with the presentation animation
+        addFloatingPanel()
+    }

    override func presentationTransitionDidEnd(_ completed: Bool) {
        // For non-animated presentation
@@ -39,34 +43,23 @@ class FloatingPanelPresentationController: UIPresentationController {
            }
            fpc.view.removeFromSuperview()
        }
-
    }

    override func containerViewWillLayoutSubviews() {
        guard
-            let containerView = self.containerView,
-            let fpc = presentedViewController as? FloatingPanelController,
-            let fpView = fpc.view
+            let fpc = presentedViewController as? FloatingPanelController
            else { fatalError() }

        /*
         * Layout the views managed by `FloatingPanelController` here for the
-         * sake of the presentation and disimissal modally from the controller.
+         * sake of the presentation and dismissal modally from the controller.
         */
-        containerView.addSubview(fpView)
-        fpView.frame = containerView.bounds
-        fpView.translatesAutoresizingMaskIntoConstraints = false
-        NSLayoutConstraint.activate([
-            fpView.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 0.0),
-            fpView.leftAnchor.constraint(equalTo: containerView.leftAnchor, constant: 0.0),
-            fpView.rightAnchor.constraint(equalTo: containerView.rightAnchor, constant: 0.0),
-            fpView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor, constant: 0.0),
-            ])
+        addFloatingPanel()

        // Forward touch events to the presenting view controller
-        (fpView as? FloatingPanelPassThroughView)?.eventForwardingView = presentingViewController.view
+        (fpc.view as? FloatingPanelPassThroughView)?.eventForwardingView = presentingViewController.view

-        // Set tap-to-dimiss in the backdrop view
+        // Set tap-to-dismiss in the backdrop view
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleBackdrop(tapGesture:)))
        fpc.backdropView.addGestureRecognizer(tapGesture)
    }
@@ -74,6 +67,17 @@ class FloatingPanelPresentationController: UIPresentationController {
    @objc func handleBackdrop(tapGesture: UITapGestureRecognizer) {
        presentedViewController.dismiss(animated: true, completion: nil)
    }
+
+    private func addFloatingPanel() {
+        guard
+            let containerView = self.containerView,
+            let fpc = presentedViewController as? FloatingPanelController
+            else { fatalError() }
+
+        containerView.addSubview(fpc.view)
+        fpc.view.frame = containerView.bounds
+        fpc.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+    }
 }

 class FloatingPanelModalPresentTransition: NSObject, UIViewControllerAnimatedTransitioning {
@@ -91,9 +95,6 @@ class FloatingPanelModalPresentTransition: NSObject, UIViewControllerAnimatedTra
            let fpc = transitionContext.viewController(forKey: .to) as? FloatingPanelController
        else { fatalError() }

-        // Must set the container's bounds to the floating panel view
-        fpc.view?.frame = transitionContext.containerView.bounds
-
        fpc.show(animated: true) {
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }
@@ -6,32 +6,30 @@
 import UIKit

 public class GrabberHandleView: UIView {
-    public struct Default {
-        public static let width: CGFloat = 36.0
-        public static let height: CGFloat = 5.0
-        public static let barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0)
-    }
+
+    public var barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0) { didSet { backgroundColor = barColor } }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
-        render()
    }

    init() {
-        let size = CGSize(width: Default.width,
-                          height: Default.height)
-        super.init(frame: CGRect(origin: .zero, size: size))
-        self.backgroundColor = Default.barColor
-        render()
+        super.init(frame: .zero)
+        backgroundColor = barColor
    }

-    private func render() {
-        self.layer.masksToBounds = true
-        self.layer.cornerRadius = frame.size.height * 0.5
+    public override func layoutSubviews() {
+        super.layoutSubviews()
+        render()
    }

    public override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let view = super.hitTest(point, with: event)
        return view == self ? nil : view
    }
+
+    private func render() {
+        self.layer.masksToBounds = true
+        self.layer.cornerRadius = frame.size.height * 0.5
+    }
 }
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.1.0</string>
+	<string>1.6.2</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 </dict>
@@ -19,29 +19,17 @@ struct Logger {
        case info = 1
        case warning = 2
        case error = 3
-        case fault = 4

-        var name: String {
-            switch self {
-            case .debug: return "DEBUG"
-            case .info: return "INFO"
-            case .warning: return "WARNING"
-            case .error: return "ERROR"
-            case .fault: return "FAULT"
-            }
-        }
-        var shortName: String {
+        var displayName: String {
            switch self {
            case .debug:
                return "D/"
            case .info:
                return "I/"
            case .warning:
-                return "W/"
+                return "Warning:"
            case .error:
-                return "E/"
-            case .fault:
-                return "F/"
+                return "Error:"
            }
        }
        @available(iOS 10.0, *)
@@ -49,31 +37,40 @@ struct Logger {
            switch self {
            case .debug: return .debug
            case .info: return .info
-            case .warning: return .info
+            case .warning: return .default
            case .error: return .error
-            case .fault: return .fault
            }
        }

-        public static func < (lhs: Logger.Level, rhs: Logger.Level) -> Bool {
+        static func < (lhs: Logger.Level, rhs: Logger.Level) -> Bool {
            return lhs.rawValue < rhs.rawValue
        }
    }

-    init() {
+    typealias Hook = ((String, Level) -> Void)
+    var hook: Hook?
+
+    fileprivate init() {
        osLog = OSLog(subsystem: "com.scenee.FloatingPanel", category: "FloatingPanel")
    }

    private func log(_ level: Level, _ message: Any, _ arguments: [Any], function: String, line: UInt) {
-        #if __FP_LOG
        _ = s.wait(timeout: .now() + 0.033)
        defer { s.signal() }

        let extraMessage: String = arguments.map({ String(describing: $0) }).joined(separator: " ")
-        let log = "\(level.shortName) \(message) \(extraMessage) (\(function):\(line))"
+        let log: String = {
+            switch level {
+            case .debug:
+                return "\(level.displayName) \(message) \(extraMessage) (\(function):\(line))"
+            default:
+                return "\(level.displayName) \(message) \(extraMessage)"
+            }
+        }()
+
+        hook?(log, level)

        os_log("%@", log: osLog, type: level.osLogType, log)
-        #endif
    }

    private func getPrettyFunction(_ function: String, _ file: String) -> String {
@@ -85,7 +82,9 @@ struct Logger {
    }

    func debug(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
+        #if __FP_LOG
        self.log(.debug, log, arguments, function: getPrettyFunction(function, file), line: line)
+        #endif
    }

    func info(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
@@ -99,8 +98,4 @@ struct Logger {
    func error(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
        self.log(.error, log, arguments, function: getPrettyFunction(function, file), line: line)
    }
-
-    func fault(_ log: Any, _ arguments: Any..., function: String = #function, file: String  = #file, line: UInt = #line) {
-        self.log(.fault, log, arguments, function: getPrettyFunction(function, file), line: line)
-    }
 }
@@ -73,24 +73,43 @@ extension UIView {
    }
 }

-
-extension UIGestureRecognizerState: CustomDebugStringConvertible {
+#if __FP_LOG
+#if swift(>=4.2)
+extension UIGestureRecognizer.State: CustomDebugStringConvertible {
    public var debugDescription: String {
        switch self {
-        case .began: return "Began"
-        case .changed: return "Changed"
-        case .failed: return "Failed"
-        case .cancelled: return "Cancelled"
-        case .ended: return "Endeded"
-        case .possible: return "Possible"
+        case .began: return "began"
+        case .changed: return "changed"
+        case .failed: return "failed"
+        case .cancelled: return "cancelled"
+        case .ended: return "endeded"
+        case .possible: return "possible"
        }
    }
 }
+#else
+extension UIGestureRecognizerState: CustomDebugStringConvertible {
+    public var debugDescription: String {
+        switch self {
+        case .began: return "began"
+        case .changed: return "changed"
+        case .failed: return "failed"
+        case .cancelled: return "cancelled"
+        case .ended: return "endeded"
+        case .possible: return "possible"
+        }
+    }
+}
+#endif
+#endif

 extension UIScrollView {
    var contentOffsetZero: CGPoint {
        return CGPoint(x: 0.0, y: 0.0 - contentInset.top)
    }
+    var isLocked: Bool {
+        return !showsVerticalScrollIndicator && !bounces &&  isDirectionalLockEnabled
+    }
 }

 extension UISpringTimingParameters {
@@ -101,3 +120,19 @@ extension UISpringTimingParameters {
        self.init(mass: mass, stiffness: stiffness, damping: damp, initialVelocity: initialVelocity)
    }
 }
+
+extension CGPoint {
+    static var nan: CGPoint {
+        return CGPoint(x: CGFloat.nan,
+                       y: CGFloat.nan)
+    }
+}
+
+extension UITraitCollection {
+    func shouldUpdateLayout(from previous: UITraitCollection) -> Bool {
+        return previous.horizontalSizeClass != horizontalSizeClass
+            || previous.verticalSizeClass != verticalSizeClass
+            || previous.preferredContentSizeCategory != preferredContentSizeCategory
+            || previous.layoutDirection != layoutDirection
+    }
+}
@@ -0,0 +1,22 @@
+//
+//  Created by Shin Yamamoto on 2018/11/01.
+//  Copyright © 2018 Shin Yamamoto. All rights reserved.
+//
+
+import UIKit
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+    var window: UIWindow?
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+        let rootVC = UIViewController(nibName: nil, bundle: nil)
+        rootVC.view.backgroundColor = .gray
+
+        let window = UIWindow()
+        window.rootViewController = rootVC
+        window.makeKeyAndVisible()
+        self.window = window
+
+        return true
+    }
+}
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13142" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12042"/>
+        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Copyright © 2019 scenee. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="obG-Y5-kRd">
+                                <rect key="frame" x="0.0" y="626.5" width="375" height="20.5"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="TestingApp" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="GJd-Yh-RWb">
+                                <rect key="frame" x="0.0" y="202" width="375" height="43"/>
+                                <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
+                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="centerX" secondItem="obG-Y5-kRd" secondAttribute="centerX" id="5cz-MP-9tL"/>
+                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="centerX" secondItem="GJd-Yh-RWb" secondAttribute="centerX" id="Q3B-4B-g5h"/>
+                            <constraint firstItem="obG-Y5-kRd" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" constant="20" symbolic="YES" id="SfN-ll-jLj"/>
+                            <constraint firstAttribute="bottom" secondItem="obG-Y5-kRd" secondAttribute="bottom" constant="20" id="Y44-ml-fuU"/>
+                            <constraint firstItem="GJd-Yh-RWb" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="bottom" multiplier="1/3" constant="1" id="moa-c2-u7t"/>
+                            <constraint firstItem="GJd-Yh-RWb" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" constant="20" symbolic="YES" id="x7j-FC-K8j"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="Bcu-3y-fUS"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
@@ -0,0 +1,82 @@
+//
+//  Created by Shin Yamamoto on 2018/09/18.
+//  Copyright © 2018 Shin Yamamoto. All rights reserved.
+//
+
+import XCTest
+@testable import FloatingPanel
+
+class FloatingPanelControllerTests: XCTestCase {
+
+    override func setUp() {}
+
+    override func tearDown() {}
+
+    func test_warningRetainCycle() {
+        let myVC = MyZombieViewController(nibName: nil, bundle: nil)
+        let exp = expectation(description: "Warning retain cycle")
+        exp.expectedFulfillmentCount = 2 // For layout & behavior logs
+        log.hook = {(log, level) in
+            if log.contains("A memory leak will occur by a retain cycle because") {
+                XCTAssert(level == .warning)
+                exp.fulfill()
+            }
+        }
+        myVC.loadViewIfNeeded()
+        wait(for: [exp], timeout: 10)
+    }
+
+    func test_addPanel() {
+        guard let rootVC = UIApplication.shared.keyWindow?.rootViewController else { fatalError() }
+        let fpc = FloatingPanelController()
+        fpc.addPanel(toParent: rootVC)
+        XCTAssert(fpc.surfaceView.frame.minY ==  (fpc.view.bounds.height - fpc.layoutInsets.bottom) - fpc.layout.insetFor(position: .half)!)
+        fpc.move(to: .tip, animated: false)
+        XCTAssert(fpc.surfaceView.frame.minY == (fpc.view.bounds.height - fpc.layoutInsets.bottom) - fpc.layout.insetFor(position: .tip)!)
+    }
+
+    @available(iOS 12.0, *)
+    func test_updateLayout_willTransition() {
+        class MyDelegate: FloatingPanelControllerDelegate {
+            func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
+                if newCollection.userInterfaceStyle == .dark {
+                    XCTFail()
+                }
+                return nil
+            }
+        }
+        let myDelegate = MyDelegate()
+        let fpc = FloatingPanelController(delegate: myDelegate)
+        let traitCollection = UITraitCollection(traitsFrom: [fpc.traitCollection,
+                                                             UITraitCollection(userInterfaceStyle: .dark)])
+        XCTAssertEqual(traitCollection.userInterfaceStyle, .dark)
+        fpc.prepare(for: traitCollection)
+    }
+}
+
+private class MyZombieViewController: UIViewController, FloatingPanelLayout, FloatingPanelBehavior, FloatingPanelControllerDelegate {
+    var fpc: FloatingPanelController?
+    override func viewDidLoad() {
+        fpc = FloatingPanelController(delegate: self)
+        fpc?.addPanel(toParent: self)
+    }
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
+        return self
+    }
+
+    func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
+        return self
+    }
+    var initialPosition: FloatingPanelPosition {
+        return .half
+    }
+
+    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
+        switch position {
+        case .full: return UIScreen.main.bounds.height == 667.0 ? 18.0 : 16.0
+        case .half: return 262.0
+        case .tip: return 69.0
+        case .hidden: return nil
+        }
+    }
+}
@@ -0,0 +1,41 @@
+//
+//  Created by Shin Yamamoto on 2019/06/27.
+//  Copyright © 2019 scenee. All rights reserved.
+//
+
+import XCTest
+@testable import FloatingPanel
+
+class FloatingPanelLayoutTests: XCTestCase {
+    override func setUp() {}
+    override func tearDown() {}
+
+    func test_layoutAdapter_topAndBottomMostState() {
+        let fpc = FloatingPanelController(delegate: nil)
+        fpc.loadViewIfNeeded()
+        fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
+        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.topMostState, .full)
+        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.bottomMostState, .tip)
+
+        class FloatingPanelLayoutWithHidden: FloatingPanelLayout {
+            func insetFor(position: FloatingPanelPosition) -> CGFloat? { return nil }
+            let initialPosition: FloatingPanelPosition = .hidden
+            let supportedPositions: Set<FloatingPanelPosition> = [.hidden, .half, .full]
+        }
+        class FloatingPanelLayout2Positions: FloatingPanelLayout {
+            func insetFor(position: FloatingPanelPosition) -> CGFloat? { return nil }
+            let initialPosition: FloatingPanelPosition = .tip
+            let supportedPositions: Set<FloatingPanelPosition> = [.tip, .half]
+        }
+        let delegate = FloatingPanelTestDelegate()
+        delegate.layout = FloatingPanelLayoutWithHidden()
+        fpc.delegate = delegate
+        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.topMostState, .full)
+        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.bottomMostState, .half) // Will fixed on fix-hidden-position branch
+
+        delegate.layout = FloatingPanelLayout2Positions()
+        fpc.delegate = delegate
+        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.topMostState, .half)
+        XCTAssertEqual(fpc.floatingPanel.layoutAdapter.bottomMostState, .tip)
+    }
+}
@@ -0,0 +1,86 @@
+//
+//  Created by Shin Yamamoto on 2019/05/23.
+//  Copyright © 2019 Shin Yamamoto. All rights reserved.
+//
+
+import XCTest
+@testable import FloatingPanel
+
+class FloatingPanelSurfaceViewTests: XCTestCase {
+    override func setUp() {}
+
+    override func tearDown() {}
+
+    func test_surfaceView() {
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        XCTAssert(surface.contentView == nil)
+        surface.layoutIfNeeded()
+        XCTAssert(surface.grabberHandle.frame.minY == 6.0)
+        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth)
+        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight)
+        surface.backgroundColor = .red
+        surface.layoutIfNeeded()
+        XCTAssert(surface.backgroundColor == surface.containerView.backgroundColor)
+    }
+
+    func test_surfaceView_constraintsUpdate() {
+        let window = UIWindow()
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        window.addSubview(surface)
+        window.makeKeyAndVisible()
+        XCTAssert(surface.contentView == nil)
+        surface.layoutIfNeeded()
+        XCTAssert(surface.grabberHandle.frame.minY == 6.0)
+        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth)
+        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight)
+
+        surface.grabberHandleWidth = 44.0
+        surface.grabberHandleHeight = 12.0
+        surface.layoutIfNeeded()
+        waitRunLoop(secs: 0.000_001)
+        XCTAssert(surface.grabberHandle.frame.width == surface.grabberHandleWidth, "\(surface.grabberHandle.frame.width) == \(surface.grabberHandleWidth)")
+        XCTAssert(surface.grabberHandle.frame.height == surface.grabberHandleHeight, "\(surface.grabberHandle.frame.height) == \(surface.grabberHandleHeight)")
+        window.resignKey()
+    }
+
+    func test_surfaceView_cornderRaduis() {
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        XCTAssert(surface.cornerRadius == 0.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == false)
+
+        surface.cornerRadius = 10.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 10.0)
+        XCTAssert(surface.containerView.layer.cornerRadius == 10.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == true)
+
+        surface.containerView.layer.cornerRadius = 12.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 12.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == true)
+
+        surface.cornerRadius = 0.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 0.0)
+        XCTAssert(surface.containerView.layer.cornerRadius == 0.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == false)
+
+        surface.containerView.layer.cornerRadius = 12.0
+        surface.setNeedsLayout()
+        surface.layoutIfNeeded()
+        XCTAssert(surface.cornerRadius == 12.0)
+        XCTAssert(surface.containerView.layer.masksToBounds == true)
+    }
+
+    func test_surfaceView_border() {
+        let surface = FloatingPanelSurfaceView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))
+        XCTAssert(surface.borderColor == nil)
+        XCTAssert(surface.borderWidth == 0.0)
+
+        surface.borderColor = .red
+        surface.borderWidth = 3.0
+        surface.layoutIfNeeded()
+        XCTAssert(surface.containerView.layer.borderColor == UIColor.red.cgColor)
+        XCTAssert(surface.containerView.layer.borderWidth == 3.0)
+    }
+}
@@ -0,0 +1,78 @@
+//
+//  Created by Shin Yamamoto on 2019/05/23.
+//  Copyright © 2019 Shin Yamamoto. All rights reserved.
+//
+
+import XCTest
+@testable import FloatingPanel
+
+class FloatingPanelTests: XCTestCase {
+
+    override func setUp() {}
+
+    override func tearDown() {}
+
+    func test_scrolllock() {
+        let fpc = FloatingPanelController()
+        fpc.loadViewIfNeeded()
+        fpc.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
+        let contentVC1 = UITableViewController(nibName: nil, bundle: nil)
+        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, true)
+        XCTAssertEqual(contentVC1.tableView.bounces, true)
+
+        fpc.set(contentViewController: contentVC1)
+        fpc.track(scrollView: contentVC1.tableView)
+        fpc.show(animated: false, completion: nil) // half
+        XCTAssertEqual(fpc.position, .half)
+        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, false)
+        XCTAssertEqual(contentVC1.tableView.bounces, false)
+
+        fpc.move(to: .full, animated: false)
+        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, true)
+        XCTAssertEqual(contentVC1.tableView.bounces, true)
+
+        fpc.move(to: .tip, animated: false)
+        XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, false)
+        XCTAssertEqual(contentVC1.tableView.bounces, false)
+
+        let exp1 = expectation(description: "move to full with animation")
+        fpc.move(to: .full, animated: true) {
+            XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, true)
+            XCTAssertEqual(contentVC1.tableView.bounces, true)
+            exp1.fulfill()
+        }
+        wait(for: [exp1], timeout: 1.0)
+
+        let exp2 = expectation(description: "move to tip with animation")
+        fpc.move(to: .tip, animated: false) {
+            XCTAssertEqual(contentVC1.tableView.showsVerticalScrollIndicator, false)
+            XCTAssertEqual(contentVC1.tableView.bounces, false)
+            exp2.fulfill()
+        }
+        wait(for: [exp2], timeout: 1.0)
+
+        // Reset the content vc
+        let contentVC2 = UITableViewController(nibName: nil, bundle: nil)
+        XCTAssertEqual(contentVC2.tableView.showsVerticalScrollIndicator, true)
+        XCTAssertEqual(contentVC2.tableView.bounces, true)
+        fpc.set(contentViewController: contentVC2)
+        fpc.track(scrollView: contentVC2.tableView)
+        fpc.show(animated: false, completion: nil)
+        XCTAssertEqual(fpc.position, .half)
+        XCTAssertEqual(contentVC2.tableView.showsVerticalScrollIndicator, false)
+        XCTAssertEqual(contentVC2.tableView.bounces, false)
+    }
+
+}
+
+private protocol FloatingPanelTestLayout: FloatingPanelLayout {}
+private extension FloatingPanelTestLayout {
+    func insetFor(position: FloatingPanelPosition) -> CGFloat? {
+        switch position {
+        case .full: return 18.0
+        case .half: return 262.0
+        case .tip: return 69.0
+        default: return nil
+        }
+    }
+}
@@ -0,0 +1,18 @@
+//
+//  Created by Shin Yamamoto on 2019/06/27.
+//  Copyright © 2019 scenee. All rights reserved.
+//
+
+import Foundation
+@testable import FloatingPanel
+
+func waitRunLoop(secs: TimeInterval = 0) {
+    RunLoop.main.run(until: Date(timeIntervalSinceNow: secs))
+}
+
+class FloatingPanelTestDelegate: FloatingPanelControllerDelegate {
+    var layout: FloatingPanelLayout?
+    func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
+        return layout
+    }
+}
@@ -1,14 +0,0 @@
-//
-//  Created by Shin Yamamoto on 2018/09/18.
-//  Copyright © 2018 Shin Yamamoto. All rights reserved.
-//
-
-import XCTest
-@testable import FloatingPanelController
-
-class ViewTests: XCTestCase {
-
-    override func setUp() {}
-
-    override func tearDown() {}
-}
@@ -0,0 +1,27 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "FloatingPanel",
+    platforms: [
+        .iOS(.v10)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "FloatingPanel",
+            targets: ["FloatingPanel"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(name: "FloatingPanel", path: "Framework/Sources"),
+    ],
+    swiftLanguageVersions: [.version("5")]
+)
@@ -4,6 +4,7 @@
 [![Platform](https://img.shields.io/cocoapods/p/FloatingPanel.svg)](https://cocoapods.org/pods/FloatingPanel)
 [![Swift 4.1](https://img.shields.io/badge/Swift-4.1-orange.svg?style=flat)](https://swift.org/)
 [![Swift 4.2](https://img.shields.io/badge/Swift-4.2-orange.svg?style=flat)](https://swift.org/)
+[![Swift 5.0](https://img.shields.io/badge/Swift-5.0-orange.svg?style=flat)](https://swift.org/)

 #  FloatingPanel

@@ -67,7 +68,9 @@ Examples are here.

 ## Requirements

-FloatingPanel is written in Swift 4.2. Compatible with iOS 10.0+
+FloatingPanel is written in Swift 4.0+. It can be built by Xcode 9.4.1 or later. Compatible with iOS 10.0+.
+
+✏️ The default Swift version is 4.0 because it avoids build errors with Carthage on each Xcode version from the source compatibility between Swift 4.0, 4.2 and 5.0.

 ## Installation

@@ -80,6 +83,8 @@ it, simply add the following line to your Podfile:
 pod 'FloatingPanel'
 ```

+✏️ To suppress "Swift Conversion" warnings in Xcode, please set a Swift version to `SWIFT_VERSION` for the project in your Podfile. It will be resolved in CocoaPods v1.7.0.
+
 ### Carthage

 For [Carthage](https://github.com/Carthage/Carthage), add the following to your `Cartfile`:
@@ -139,9 +144,9 @@ fpc.isRemovalInteractionEnabled = true // Optional: Let it removable by a swipe-
 self.present(fpc, animated: true, completion: nil)
 ```

-You can show a floating panel over UINavigationController from the containnee view controllers as a modality of `.overCurrentContext` style.
+You can show a floating panel over UINavigationController from the container view controllers as a modality of `.overCurrentContext` style.

-NOTE: FloatingPanelController has the custom presentation controller. If you would like to customize the presentation/dismissal, please see [FloatingPanelTransitioning](https://github.com/SCENEE/FloatingPanel/blob/feat-modality/Framework/Sources/FloatingPanelTransitioning.swift).
+✏️ FloatingPanelController has the custom presentation controller. If you would like to customize the presentation/dismissal, please see [FloatingPanelTransitioning](https://github.com/SCENEE/FloatingPanel/blob/master/Framework/Sources/FloatingPanelTransitioning.swift).

 ## View hierarchy

@@ -151,8 +156,9 @@ NOTE: FloatingPanelController has the custom presentation controller. If you wou
 FloatingPanelController.view (FloatingPanelPassThroughView)
 ├─ .backdropView (FloatingPanelBackdropView)
 └─ .surfaceView (FloatingPanelSurfaceView)
-          ├─ .contentView  == FloatingPanelController.contentViewController.view
-          └─ .grabberHandle (GrabberHandleView)
+    ├─ .containerView (UIView)
+    │  └─ .contentView (FloatingPanelController.contentViewController.view)
+    └─ .grabberHandle (GrabberHandleView)
 ```

 ## Usage
@@ -251,7 +257,7 @@ class FloatingPanelLandscapeLayout: FloatingPanelLayout {

    public func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
        return [
-            surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuid.leftAnchor, constant: 8.0),
+            surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 8.0),
            surfaceView.widthAnchor.constraint(equalToConstant: 291),
        ]
    }