development: added new Motion for Material 2.5.0

cb8adf42 · Daniel Dahan · b77365ad · cb8adf42 · b77365ad · cb8adf42
Commit cb8adf42 authored Feb 03, 2017 by Daniel Dahan
6 changed files
--- a/Material.xcodeproj/project.pbxproj
+++ b/Material.xcodeproj/project.pbxproj
@@ -51,8 +51,6 @@
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 		96334EF61C8B84660083986B /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 96334EF51C8B84660083986B /* Assets.xcassets */; };
 		965E80C81DD4C50600D61E4B /* Motion.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96BCB76D1CB40DC500C806FE /* Motion.swift */; };
-		965E80C91DD4C50600D61E4B /* MotionTransition.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96BCB78B1CB40DC500C806FE /* MotionTransition.swift */; };
-		965E80CA1DD4C50600D61E4B /* KeyframeMotion.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96BCB77E1CB40DC500C806FE /* KeyframeMotion.swift */; };
 		965E80CB1DD4C50600D61E4B /* MotionAnimation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96E3C39D1D3A1D0C0086A024 /* MotionAnimation.swift */; };
 		965E80CC1DD4C50600D61E4B /* Bar.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96BCB7981CB40DC500C806FE /* Bar.swift */; };
 		965E80CD1DD4C50600D61E4B /* Button.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96BCB7701CB40DC500C806FE /* Button.swift */; };
@@ -154,9 +152,7 @@
 		96BCB7FA1CB40DE900C806FE /* Roboto-Regular.ttf in Resources */ = {isa = PBXBuildFile; fileRef = 96BCB7F11CB40DE900C806FE /* Roboto-Regular.ttf */; };
 		96BCB7FB1CB40DE900C806FE /* Roboto-Thin.ttf in Resources */ = {isa = PBXBuildFile; fileRef = 96BCB7F21CB40DE900C806FE /* Roboto-Thin.ttf */; };
 		96BCB7FC1CB40DE900C806FE /* Roboto-Thin.ttf in Resources */ = {isa = PBXBuildFile; fileRef = 96BCB7F21CB40DE900C806FE /* Roboto-Thin.ttf */; };
-		96BCB8101CB4115200C806FE /* MotionTransition.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96BCB78B1CB40DC500C806FE /* MotionTransition.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		96BCB8111CB4115200C806FE /* Motion.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96BCB76D1CB40DC500C806FE /* Motion.swift */; settings = {ATTRIBUTES = (Public, ); }; };
-		96BCB8131CB4115200C806FE /* KeyframeMotion.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96BCB77E1CB40DC500C806FE /* KeyframeMotion.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		96BCB8141CB4115200C806FE /* PulseMotion.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96BCB7821CB40DC500C806FE /* PulseMotion.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		96BCB8151CB4115200C806FE /* FABButton.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96BCB75F1CB40DC500C806FE /* FABButton.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		96BCB8161CB4115200C806FE /* FlatButton.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96BCB7601CB40DC500C806FE /* FlatButton.swift */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -276,7 +272,6 @@
 		96BCB77B1CB40DC500C806FE /* Font.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Font.swift; sourceTree = "<group>"; };
 		96BCB77C1CB40DC500C806FE /* Gravity.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Gravity.swift; sourceTree = "<group>"; };
 		96BCB77D1CB40DC500C806FE /* Icon.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Icon.swift; sourceTree = "<group>"; };
-		96BCB77E1CB40DC500C806FE /* KeyframeMotion.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KeyframeMotion.swift; sourceTree = "<group>"; };
 		96BCB7801CB40DC500C806FE /* Layer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Layer.swift; sourceTree = "<group>"; };
 		96BCB7811CB40DC500C806FE /* Layout.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Layout.swift; sourceTree = "<group>"; };
 		96BCB7821CB40DC500C806FE /* PulseMotion.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PulseMotion.swift; sourceTree = "<group>"; };
@@ -286,7 +281,6 @@
 		96BCB7871CB40DC500C806FE /* InterimSpace.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = InterimSpace.swift; sourceTree = "<group>"; };
 		96BCB7881CB40DC500C806FE /* Switch.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Switch.swift; sourceTree = "<group>"; };
 		96BCB7891CB40DC500C806FE /* TableViewCell.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TableViewCell.swift; sourceTree = "<group>"; };
-		96BCB78B1CB40DC500C806FE /* MotionTransition.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MotionTransition.swift; sourceTree = "<group>"; };
 		96BCB78C1CB40DC500C806FE /* View.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = View.swift; sourceTree = "<group>"; };
 		96BCB78E1CB40DC500C806FE /* Menu.swift */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 4; lastKnownFileType = sourcecode.swift; path = Menu.swift; sourceTree = "<group>"; tabWidth = 4; };
 		96BCB7901CB40DC500C806FE /* NavigationBar.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NavigationBar.swift; sourceTree = "<group>"; };
@@ -752,8 +746,6 @@
 			children = (
 				96BCB76D1CB40DC500C806FE /* Motion.swift */,
 				96E3C39D1D3A1D0C0086A024 /* MotionAnimation.swift */,
-				96BCB78B1CB40DC500C806FE /* MotionTransition.swift */,
-				96BCB77E1CB40DC500C806FE /* KeyframeMotion.swift */,
 				96BCB7821CB40DC500C806FE /* PulseMotion.swift */,
 				961730351E0E156400A9A297 /* SpringMotion.swift */,
 			);
@@ -832,9 +824,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				96D88C321C1328D800B91418 /* Material.h in Headers */,
-				96BCB8101CB4115200C806FE /* MotionTransition.swift in Headers */,
 				96BCB8111CB4115200C806FE /* Motion.swift in Headers */,
-				96BCB8131CB4115200C806FE /* KeyframeMotion.swift in Headers */,
 				96BCB8141CB4115200C806FE /* PulseMotion.swift in Headers */,
 				96BCB8151CB4115200C806FE /* FABButton.swift in Headers */,
 				96BCB8161CB4115200C806FE /* FlatButton.swift in Headers */,
@@ -1109,8 +1099,6 @@
 				965E80FE1DD4D59500D61E4B /* ToolbarController.swift in Sources */,
 				96328B971E05C0BB009A4C90 /* TableView.swift in Sources */,
 				965E80C81DD4C50600D61E4B /* Motion.swift in Sources */,
-				965E80C91DD4C50600D61E4B /* MotionTransition.swift in Sources */,
-				965E80CA1DD4C50600D61E4B /* KeyframeMotion.swift in Sources */,
 				965E80F81DD4D59500D61E4B /* ImageCard.swift in Sources */,
 				96328B991E05C0CE009A4C90 /* TableViewController.swift in Sources */,
 				965E80F91DD4D59500D61E4B /* PresenterCard.swift in Sources */,

--- a/Sources/iOS/KeyframeMotion.swift
+++ b/Sources/iOS/KeyframeMotion.swift
-/*
- * Copyright (C) 2015 - 2017, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *	*	Redistributions of source code must retain the above copyright notice, this
- *		list of conditions and the following disclaimer.
- *
- *	*	Redistributions in binary form must reproduce the above copyright notice,
- *		this list of conditions and the following disclaimer in the documentation
- *		and/or other materials provided with the distribution.
- *
- *	*	Neither the name of CosmicMind nor the names of its
- *		contributors may be used to endorse or promote products derived from
- *		this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-import UIKit
-@objc(AnimationRotationMode)
-public enum AnimationRotationMode: Int {
-	case `default`
-	case auto
-	case autoReverse
-}
-/**
- Converts an AnimationRotationMode to a corresponding CAAnimationRotate key.
- - Parameter mode: An AnimationRotationMode.
- - Returns: An optional CAAnimationRotate key String.
- */
-public func AnimationRotationModeToValue(mode: AnimationRotationMode) -> String? {
-	switch mode {
-    case .default:
-        return nil
-    case .auto:
-		return kCAAnimationRotateAuto
-	case .autoReverse:
-		return kCAAnimationRotateAutoReverse
-	}
-}
-extension Motion {
-	/**
-     Creates a CAKeyframeAnimation.
-     - Parameter bezierPath: A UIBezierPath.
-     - Parameter mode: An AnimationRotationMode.
-     - Parameter duration: An animation duration time.
-     - Returns: A CAKeyframeAnimation.
-     */
-	public static func path(bezierPath: UIBezierPath, mode: AnimationRotationMode = .auto, duration: CFTimeInterval? = nil) -> CAKeyframeAnimation {
-		let animation = CAKeyframeAnimation()
-		animation.keyPath = MotionAnimationKeyPath.position.rawValue
-		animation.path = bezierPath.cgPath
-        animation.rotationMode = AnimationRotationModeToValue(mode: mode)
-        if let v = duration {
-			animation.duration = v
-		}
-		return animation
-	}
-}
--- a/Sources/iOS/Motion.swift
+++ b/Sources/iOS/Motion.swift
@@ -86,7 +86,275 @@ public func MotionAnimationTimingFunctionToValue(timingFunction: MotionAnimation
 public typealias MotionDelayCancelBlock = (Bool) -> Void
-public struct Motion {
+fileprivate var MotionInstanceKey: UInt8 = 0
+fileprivate var MotionInstanceControllerKey: UInt8 = 0
+fileprivate struct MotionInstance {
+    fileprivate var identifier: String
+    fileprivate var animations: [MotionAnimation]
+}
+fileprivate struct MotionInstanceController {
+    fileprivate var isEnabled: Bool
+    fileprivate weak var delegate: MotionDelegate?
+}
+extension UIViewController: MotionDelegate, UIViewControllerTransitioningDelegate {
+    /// MotionInstanceController Reference.
+    fileprivate var motionInstanceController: MotionInstanceController {
+        get {
+            return AssociatedObject(base: self, key: &MotionInstanceControllerKey) {
+                return MotionInstanceController(isEnabled: false, delegate: nil)
+            }
+        }
+        set(value) {
+            AssociateObject(base: self, key: &MotionInstanceControllerKey, value: value)
+        }
+    }
+    open var isMotionEnabled: Bool {
+        get {
+            return motionInstanceController.isEnabled
+        }
+        set(value) {
+            if value {
+                modalPresentationStyle = .custom
+                transitioningDelegate = self
+                motionDelegate = self
+            }
+            motionInstanceController.isEnabled = value
+        }
+    }
+    open weak var motionDelegate: MotionDelegate? {
+        get {
+            return motionInstanceController.delegate
+        }
+        set(value) {
+            motionInstanceController.delegate = value
+        }
+    }
+}
+extension UIViewController {
+    open func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
+        return isMotionEnabled ? Motion(isPresenting: true) : nil
+    }
+    open func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
+        return isMotionEnabled ? Motion() : nil
+    }
+    open func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
+        return isMotionEnabled ? MotionPresentationController(presentedViewController: presented, presenting: presenting) : nil
+    }
+}
+extension UIView {
+    /// MaterialTransitionItem Reference.
+    fileprivate var motionInstance: MotionInstance {
+        get {
+            return AssociatedObject(base: self, key: &MotionInstanceKey) {
+                return MotionInstance(identifier: "", animations: [])
+            }
+        }
+        set(value) {
+            AssociateObject(base: self, key: &MotionInstanceKey, value: value)
+        }
+    }
+    open var motionIdentifier: String {
+        get {
+            return motionInstance.identifier
+        }
+        set(value) {
+            motionInstance.identifier = value
+        }
+    }
+    open var motionAnimations: [MotionAnimation] {
+        get {
+            return motionInstance.animations
+        }
+        set(value) {
+            motionInstance.animations = value
+        }
+    }
+    open func transitionSnapshot(afterUpdates: Bool, shouldHide: Bool = true) -> UIView {
+        isHidden = false
+        let oldCornerRadius = cornerRadius
+        cornerRadius = 0
+        var oldBackgroundColor: UIColor?
+        if shouldHide {
+            oldBackgroundColor = backgroundColor
+            backgroundColor = .clear
+        }
+        let oldTransform = motionTransform
+        motionTransform = CATransform3DIdentity
+        let v = snapshotView(afterScreenUpdates: afterUpdates)!
+        cornerRadius = oldCornerRadius
+        if shouldHide {
+            backgroundColor = oldBackgroundColor
+        }
+        motionTransform = oldTransform
+        let contentView = v.subviews.first!
+        contentView.cornerRadius = cornerRadius
+        contentView.masksToBounds = true
+        v.motionIdentifier = motionIdentifier
+        v.position = motionPosition
+        v.bounds = bounds
+        v.cornerRadius = cornerRadius
+        v.zPosition = zPosition
+        v.opacity = opacity
+        v.isOpaque = isOpaque
+        v.anchorPoint = anchorPoint
+        v.masksToBounds = masksToBounds
+        v.borderColor = borderColor
+        v.borderWidth = borderWidth
+        v.shadowRadius = shadowRadius
+        v.shadowOpacity = shadowOpacity
+        v.shadowColor = shadowColor
+        v.shadowOffset = shadowOffset
+        v.contentMode = contentMode
+        v.motionTransform = motionTransform
+        v.backgroundColor = backgroundColor
+        isHidden = shouldHide
+        return v
+    }
+}
+open class MotionPresentationController: UIPresentationController {
+    open override func presentationTransitionWillBegin() {
+        guard nil != containerView else {
+            return
+        }
+        presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (context) in
+            print("Animating")
+        })
+        print("presentationTransitionWillBegin")
+    }
+    open override func presentationTransitionDidEnd(_ completed: Bool) {
+        print("presentationTransitionDidEnd")
+    }
+    open override func dismissalTransitionWillBegin() {
+        guard nil != containerView else {
+            return
+        }
+        presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (context) in
+            print("Animating")
+        })
+        print("dismissalTransitionWillBegin")
+    }
+    open override func dismissalTransitionDidEnd(_ completed: Bool) {
+        print("dismissalTransitionDidEnd")
+    }
+    open override var frameOfPresentedViewInContainerView: CGRect {
+        return containerView?.bounds ?? .zero
+    }
+}
+@objc(MotionDelegate)
+public protocol MotionDelegate {
+    @objc
+    optional func motion(motion: Motion, willTransition fromView: UIView, toView: UIView)
+    @objc
+    optional func motion(motion: Motion, didTransition fromView: UIView, toView: UIView)
+    @objc
+    optional func motionModifyDelay(motion: Motion) -> TimeInterval
+    @objc
+    optional func motionTransitionAnimation(motion: Motion)
+}
+open class Motion: NSObject {
+    open var isPresenting: Bool
+    open fileprivate(set) var transitionPairs = [(UIView, UIView)]()
+    open var transitionSnapshot: UIView!
+    open let transitionBackgroundView = UIView()
+    open var toViewController: UIViewController!
+    open var fromViewController: UIViewController!
+    open var transitionContext: UIViewControllerContextTransitioning!
+    open var delay: TimeInterval = 0
+    open var duration: TimeInterval = 0.35
+    open var containerView: UIView!
+    open var transitionView = UIView()
+    fileprivate var modifiedDelay: TimeInterval {
+        return fromViewController?.motionDelegate?.motionModifyDelay?(motion: self) ?? 0
+    }
+    public override init() {
+        isPresenting = false
+        super.init()
+    }
+    public init(isPresenting: Bool) {
+        self.isPresenting = isPresenting
+        super.init()
+    }
+    open var toView: UIView {
+        return toViewController.view
+    }
+    open var toSubviews: [UIView] {
+        return Motion.subviews(of: toView)
+    }
+    open var fromView: UIView {
+        return fromViewController.view
+    }
+    open var fromSubviews: [UIView] {
+        return Motion.subviews(of: fromView)
+    }
+    open class func subviews(of view: UIView) -> [UIView] {
+        var views: [UIView] = []
+        Motion.subviews(of: view, views: &views)
+        return views
+    }
+    open class func subviews(of view: UIView, views: inout [UIView]) {
+        for v in view.subviews {
+            if 0 < v.motionIdentifier.utf16.count {
+                views.append(v)
+            }
+            subviews(of: v, views: &views)
+        }
+    }
    /**
     Executes a block of code after a time delay.
     - Parameter duration: An animation duration time.
@@ -95,10 +363,9 @@ public struct Motion {
     the animations have completed.
     */
    @discardableResult
-    public static func delay(_ time: TimeInterval, execute block: @escaping () -> Void) -> MotionDelayCancelBlock? {
+    open class func delay(_ time: TimeInterval, execute block: @escaping () -> Void) -> MotionDelayCancelBlock? {
        func asyncAfter(completion: @escaping () -> Void) {
-			DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + time, execute: completion)
+            DispatchQueue.main.asyncAfter(deadline: .now() + time, execute: completion)
        }
        var cancelable: MotionDelayCancelBlock?
@@ -124,35 +391,168 @@ public struct Motion {
     Cancels the delayed MotionDelayCancelBlock.
     - Parameter delayed completion: An MotionDelayCancelBlock.
     */
-	public static func cancel(delayed completion: MotionDelayCancelBlock) {
+    open class func cancel(delayed completion: MotionDelayCancelBlock) {
        completion(true)
    }
+}
-	/**
+extension Motion: UIViewControllerAnimatedTransitioning {
-     Disables the default animations set on CALayers. 
+    @objc(animateTransition:)
-     - Parameter animations: A callback that wraps the animations to disable.
+    open func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
-     */
+        self.transitionContext = transitionContext
-	public static func disable(animations: (() -> Void)) {
+        prepareToViewController()
-		animate(duration: 0, animations: animations)
+        prepareFromViewController()
+        fromViewController.motionDelegate?.motion?(motion: self, willTransition: fromView, toView: toView)
+        Motion.delay(modifiedDelay) { [weak self] in
+            guard let s = self else {
+                return
            }
-	/**
+            s.prepareContainerView()
-     Runs an animation with a specified duration.
+            s.prepareTransitionSnapshot()
-     - Parameter duration: An animation duration time.
+            s.prepareTransitionPairs()
-     - Parameter animations: An animation block.
+            s.prepareTransitionView()
-     - Parameter timingFunction: An MotionAnimationTimingFunction value.
+            s.prepareTransitionBackgroundView()
-     - Parameter completion: A completion block that is executed once
+            s.prepareTransitionToView()
-     the animations have completed.
+            s.prepareTransitionAnimation()
-     */
+        }
-	public static func animate(duration: CFTimeInterval, timingFunction: MotionAnimationTimingFunction = .easeInEaseOut, animations: (() -> Void), completion: (() -> Void)? = nil) {
+    }
-		CATransaction.begin()
-		CATransaction.setAnimationDuration(duration)
+    @objc(transitionDuration:)
-		CATransaction.setCompletionBlock(completion)
+    open func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
-        CATransaction.setAnimationTimingFunction(MotionAnimationTimingFunctionToValue(timingFunction: timingFunction))
+        return delay + duration
-		animations()
+    }
-		CATransaction.commit()
+}
+extension Motion {
+    fileprivate func prepareToViewController() {
+        guard let v = transitionContext.viewController(forKey: .to) else {
+            return
+        }
+        toViewController = v
+    }
+    fileprivate func prepareFromViewController() {
+        guard let v = transitionContext.viewController(forKey: .from) else {
+            return
+        }
+        fromViewController = v
    }
+    fileprivate func prepareContainerView() {
+        containerView = transitionContext.containerView
+    }
+    fileprivate func prepareTransitionSnapshot() {
+        transitionSnapshot = fromView.transitionSnapshot(afterUpdates: true, shouldHide: false)
+        transitionSnapshot.frame = containerView.bounds
+        containerView.insertSubview(transitionSnapshot, aboveSubview: fromView)
+    }
+    fileprivate func prepareTransitionPairs() {
+        for from in fromSubviews {
+            for to in toSubviews {
+                guard to.motionIdentifier == from.motionIdentifier else {
+                    continue
+                }
+                transitionPairs.append((from, to))
+            }
+        }
+    }
+    fileprivate func prepareTransitionView() {
+        transitionView.frame = containerView.bounds
+        transitionView.isUserInteractionEnabled = false
+        containerView.insertSubview(transitionView, belowSubview: transitionSnapshot)
+    }
+    fileprivate func prepareTransitionBackgroundView() {
+        transitionBackgroundView.backgroundColor = isPresenting ? .clear : fromView.backgroundColor ?? .clear
+        transitionBackgroundView.frame = transitionView.bounds
+        transitionView.addSubview(transitionBackgroundView)
+    }
+    fileprivate func prepareTransitionToView() {
+        toView.isHidden = isPresenting
+        containerView.insertSubview(toView, belowSubview: transitionView)
+        toView.updateConstraints()
+        toView.setNeedsLayout()
+        toView.layoutIfNeeded()
+    }
+    fileprivate func prepareTransitionAnimation() {
+        addTransitionAnimations()
+        addBackgroundMotionAnimation()
+        cleanupAnimation()
+        removeTransitionSnapshot()
+    }
+}
+extension Motion {
+    fileprivate func addTransitionAnimations() {
+        for (from, to) in transitionPairs {
+            var snapshotAnimations = [CABasicAnimation]()
+            var snapshotChildAnimations = [CABasicAnimation]()
+            let sizeAnimation = Motion.size(to.bounds.size)
+            let cornerRadiusAnimation = Motion.corner(radius: to.cornerRadius)
+            snapshotAnimations.append(sizeAnimation)
+            snapshotAnimations.append(cornerRadiusAnimation)
+            snapshotAnimations.append(Motion.position(to: to.motionPosition))
+            snapshotAnimations.append(Motion.transform(transform: to.motionTransform))
+            snapshotAnimations.append(Motion.background(color: to.backgroundColor ?? .clear))
+            snapshotChildAnimations.append(cornerRadiusAnimation)
+            snapshotChildAnimations.append(sizeAnimation)
+            snapshotChildAnimations.append(Motion.position(x: to.bounds.width / 2, y: to.bounds.height / 2))
+            let d = transitionDuration(animations: to.motionAnimations)
+            let snapshot = from.transitionSnapshot(afterUpdates: true)
+            transitionView.addSubview(snapshot)
+            Motion.delay(motionDelay(animations: to.motionAnimations)) { [weak self, weak to] in
+                guard let s = self else {
+                    return
+                }
+                guard let v = to else {
+                    return
+                }
+                let tf = s.motionTimingFunction(animations: v.motionAnimations)
+                let snapshotGroup = Motion.animate(group: snapshotAnimations, duration: d)
+                snapshotGroup.fillMode = MotionAnimationFillModeToValue(mode: .forwards)
+                snapshotGroup.isRemovedOnCompletion = false
+                snapshotGroup.timingFunction = MotionAnimationTimingFunctionToValue(timingFunction: tf)
+                let snapshotChildGroup = Motion.animate(group: snapshotChildAnimations, duration: d)
+                snapshotChildGroup.fillMode = MotionAnimationFillModeToValue(mode: .forwards)
+                snapshotChildGroup.isRemovedOnCompletion = false
+                snapshotChildGroup.timingFunction = MotionAnimationTimingFunctionToValue(timingFunction: tf)
+                snapshot.animate(snapshotGroup)
+                snapshot.subviews.first!.animate(snapshotChildGroup)
+            }
+        }
+        fromViewController.motionDelegate?.motionTransitionAnimation?(motion: self)
+        toViewController.motionDelegate?.motionTransitionAnimation?(motion: self)
+    }
+    fileprivate func addBackgroundMotionAnimation() {
+        transitionBackgroundView.motion(.backgroundColor(isPresenting ? toView.backgroundColor ?? .clear : .clear), .duration(transitionDuration(using: transitionContext)))
+    }
+}
+extension Motion {
    /**
     Creates a CAAnimationGroup.
     - Parameter animations: An Array of CAAnimation objects.
@@ -160,7 +560,7 @@ public struct Motion {
     - Parameter duration: An animation duration time for the group.
     - Returns: A CAAnimationGroup.
     */
-    public static func animate(group animations: [CAAnimation], timingFunction: MotionAnimationTimingFunction = .easeInEaseOut, duration: CFTimeInterval = 0.5) -> CAAnimationGroup {
+    internal class func animate(group animations: [CAAnimation], timingFunction: MotionAnimationTimingFunction = .easeInEaseOut, duration: CFTimeInterval = 0.5) -> CAAnimationGroup {
        let group = CAAnimationGroup()
        group.fillMode = MotionAnimationFillModeToValue(mode: .forwards)
        group.isRemovedOnCompletion = false
@@ -169,19 +569,92 @@ public struct Motion {
        group.timingFunction = MotionAnimationTimingFunctionToValue(timingFunction: timingFunction)
        return group
    }
+}
-	/**
+extension Motion {
-     Executes an animation block with a given delay and duration.
+    fileprivate func motionDelay(animations: [MotionAnimation]) -> TimeInterval {
-     - Parameter delay time: A CFTimeInterval.
+        var t: TimeInterval = 0
-     - Parameter duration: An animation duration time.
+        for a in animations {
-     - Parameter animations: An animation block.
+            switch a {
-     - Parameter completion: A completion block that is executed once
+            case let .delay(time):
-     the animations have completed.
+                if time > delay {
-     */
+                    delay = time
-	public static func animate(delay time: CFTimeInterval, duration: CFTimeInterval, animations: @escaping (() -> Void), completion: (() -> Void)? = nil) {
+                }
-        delay(time) {
+                t = time
-            animate(duration: duration, animations: animations, completion: completion)
+            default:break
            }
        }
+        return t
+    }
+    fileprivate func transitionDuration(animations: [MotionAnimation]) -> TimeInterval {
+        var t: TimeInterval = 0.35
+        for a in animations {
+            switch a {
+            case let .duration(time):
+                if time > duration {
+                    duration = time
+                }
+                t = time
+            default:break
+            }
+        }
+        return t
+    }
+    fileprivate func motionTimingFunction(animations: [MotionAnimation]) -> MotionAnimationTimingFunction {
+        var t = MotionAnimationTimingFunction.easeInEaseOut
+        for a in animations {
+            switch a {
+            case let .timingFunction(timingFunction):
+                t = timingFunction
+            default:break
+            }
+        }
+        return t
+    }
 }
+extension Motion {
+    fileprivate func cleanupAnimation() {
+        Motion.delay(transitionDuration(using: transitionContext) + modifiedDelay) { [weak self] in
+            guard let s = self else {
+                return
+            }
+            s.showToSubviews()
+            s.clearTransitionView()
+            s.clearTransitionPairs()
+            s.completeTransition()
+        }
+    }
+    fileprivate func removeTransitionSnapshot() {
+        Motion.delay(delay) { [weak self] in
+            self?.transitionSnapshot.removeFromSuperview()
+        }
+    }
+    fileprivate func showToSubviews() {
+        toSubviews.forEach {
+            $0.isHidden = false
+        }
+        toView.isHidden = false
+    }
+    fileprivate func clearTransitionPairs() {
+        transitionPairs.removeAll()
+    }
+    fileprivate func clearTransitionView() {
+        transitionView.removeFromSuperview()
+        transitionView.subviews.forEach {
+            $0.removeFromSuperview()
+        }
+    }
+    fileprivate func completeTransition() {
+        toViewController.motionDelegate?.motion?(motion: self, didTransition: fromView, toView: toView)
+        transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
+    }
+}
--- a/Sources/iOS/MotionAnimation.swift
+++ b/Sources/iOS/MotionAnimation.swift
@@ -32,6 +32,7 @@ import UIKit
 public enum MotionAnimationKeyPath: String {
    case backgroundColor
+    case barTintColor
    case cornerRadius
    case transform
    case rotation  = "transform.rotation"
@@ -61,6 +62,7 @@ public enum MotionAnimation {
    case duration(TimeInterval)
    case custom(CABasicAnimation)
    case backgroundColor(UIColor)
+    case barTintColor(UIColor)
    case cornerRadius(CGFloat)
    case transform(CATransform3D)
    case rotationAngle(CGFloat)
@@ -243,6 +245,8 @@ extension CALayer {
                    a.append(animation)
                case let .backgroundColor(color):
                    a.append(Motion.background(color: color))
+                case let .barTintColor(color):
+                    a.append(Motion.barTint(color: color))
                case let .cornerRadius(radius):
                    a.append(Motion.corner(radius: radius))
                case let .transform(transform):
@@ -325,6 +329,21 @@ extension UIView {
        }
    }
+    /// The global position of a view.
+    open var motionPosition: CGPoint {
+        return superview?.convert(position, to: nil) ?? position
+    }
+    /// The layer.transform of a view.
+    open var motionTransform: CATransform3D {
+        get {
+            return layer.transform
+        }
+        set(value) {
+            layer.transform = value
+        }
+    }
    /// Computes the scale X axis value of the view.
    open var motionScaleX: CGFloat {
        return transform.a
@@ -395,6 +414,17 @@ extension Motion {
    }
    /**
+     Creates a CABasicAnimation for the barTintColor key path.
+     - Parameter color: A UIColor.
+     - Returns: A CABasicAnimation.
+     */
+    public static func barTint(color: UIColor) -> CABasicAnimation {
+        let animation = CABasicAnimation(keyPath: .barTintColor)
+        animation.toValue = color.cgColor
+        return animation
+    }
+    /**
     Creates a CABasicAnimation for the cornerRadius key path.
     - Parameter radius: A CGFloat.
     - Returns: A CABasicAnimation.

--- a/Sources/iOS/MotionTransition.swift
+++ b/Sources/iOS/MotionTransition.swift
-/*
- * Copyright (C) 2015 - 2017, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *	*	Redistributions of source code must retain the above copyright notice, this
- *		list of conditions and the following disclaimer.
- *
- *	*	Redistributions in binary form must reproduce the above copyright notice,
- *		this list of conditions and the following disclaimer in the documentation
- *		and/or other materials provided with the distribution.
- *
- *	*	Neither the name of CosmicMind nor the names of its
- *		contributors may be used to endorse or promote products derived from
- *		this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-import UIKit
-fileprivate var MotionTransitionInstanceKey: UInt8 = 0
-fileprivate var MotionTransitionInstanceControllerKey: UInt8 = 0
-fileprivate struct MotionTransitionInstance {
-    fileprivate var identifier: String
-    fileprivate var animations: [MotionAnimation]
-}
-fileprivate struct MotionTransitionInstanceController {
-    fileprivate var isEnabled: Bool
-}
-extension UIViewController: UIViewControllerTransitioningDelegate {
-    /// MotionTransitionInstanceController Reference.
-    fileprivate var motionTransition: MotionTransitionInstanceController {
-        get {
-            return AssociatedObject(base: self, key: &MotionTransitionInstanceControllerKey) {
-                return MotionTransitionInstanceController(isEnabled: false)
-            }
-        }
-        set(value) {
-            AssociateObject(base: self, key: &MotionTransitionInstanceControllerKey, value: value)
-        }
-    }
-    open var isMotionTransitionEnabled: Bool {
-        get {
-            return motionTransition.isEnabled
-        }
-        set(value) {
-            if value {
-                modalPresentationStyle = .custom
-                transitioningDelegate = self
-            }
-            motionTransition.isEnabled = value
-        }
-    }
-}
-extension UIViewController {
-    open func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
-        return isMotionTransitionEnabled ? MotionTransition(isPresenting: true) : nil
-    }
-    open func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
-        return isMotionTransitionEnabled ? MotionTransition() : nil
-    }
-    open func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
-        return isMotionTransitionEnabled ? MotionTransitionPresentationController(presentedViewController: presented, presenting: presenting) : nil
-    }
-}
-extension UIViewController {
-    open func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
-        return isMotionTransitionEnabled ? MotionTransition(isPresenting: operation == .push) : nil
-    }
-}
-extension UIViewController {
-    open func tabBarController(_ tabBarController: UITabBarController, animationControllerForTransitionFrom fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
-        return isMotionTransitionEnabled ? MotionTransition() : nil
-    }
-}
-extension UIView {
-    /// The global position of a view.
-    open var motionPosition: CGPoint {
-        return superview?.convert(position, to: nil) ?? position
-    }
-    /// MaterialTransitionItem Reference.
-    fileprivate var motionTransition: MotionTransitionInstance {
-        get {
-            return AssociatedObject(base: self, key: &MotionTransitionInstanceKey) {
-                return MotionTransitionInstance(identifier: "", animations: [])
-            }
-        }
-        set(value) {
-            AssociateObject(base: self, key: &MotionTransitionInstanceKey, value: value)
-        }
-    }
-    open var motionTransitionIdentifier: String {
-        get {
-            return motionTransition.identifier
-        }
-        set(value) {
-            motionTransition.identifier = value
-        }
-    }
-    open var motionTransitionAnimations: [MotionAnimation] {
-        get {
-            return motionTransition.animations
-        }
-        set(value) {
-            motionTransition.animations = value
-        }
-    }
-    open func motionTransitionSnapshot(afterUpdates: Bool) -> UIView {
-        isHidden = false
-        (self as? Pulseable)?.pulse.pulseLayer?.isHidden = true
-        let oldCornerRadius = cornerRadius
-        cornerRadius = 0
-        let oldBackgroundColor = backgroundColor
-        backgroundColor = .clear
-        let oldTransform = transform
-        transform = .identity
-        let v = snapshotView(afterScreenUpdates: afterUpdates)!
-        cornerRadius = oldCornerRadius
-        backgroundColor = oldBackgroundColor
-        transform = oldTransform
-        let contentView = v.subviews.first!
-        contentView.cornerRadius = cornerRadius
-        contentView.masksToBounds = true
-        v.motionTransitionIdentifier = motionTransitionIdentifier
-        v.position = motionPosition
-        v.bounds = bounds
-        v.cornerRadius = cornerRadius
-        v.zPosition = zPosition
-        v.opacity = opacity
-        v.isOpaque = isOpaque
-        v.anchorPoint = anchorPoint
-        v.masksToBounds = masksToBounds
-        v.borderColor = borderColor
-        v.borderWidth = borderWidth
-        v.shadowRadius = shadowRadius
-        v.shadowOpacity = shadowOpacity
-        v.shadowColor = shadowColor
-        v.shadowOffset = shadowOffset
-        v.contentMode = contentMode
-        v.transform = transform
-        v.backgroundColor = backgroundColor
-        isHidden = true
-        (self as? Pulseable)?.pulse.pulseLayer?.isHidden = false
-        return v
-    }
-}
-open class MotionTransitionPresentationController: UIPresentationController {
-    open override func presentationTransitionWillBegin() {
-        guard nil != containerView else {
-            return
-        }
-        presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (context) in
-            print("Animating")
-        })
-        print("presentationTransitionWillBegin")
-    }
-    open override func presentationTransitionDidEnd(_ completed: Bool) {
-        print("presentationTransitionDidEnd")
-    }
-    open override func dismissalTransitionWillBegin() {
-        guard nil != containerView else {
-            return
-        }
-        presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (context) in
-            print("Animating")
-        })
-        print("dismissalTransitionWillBegin")
-    }
-    open override func dismissalTransitionDidEnd(_ completed: Bool) {
-        print("dismissalTransitionDidEnd")
-    }
-    open override var frameOfPresentedViewInContainerView: CGRect {
-        return containerView?.bounds ?? .zero
-    }
-}
-open class MotionTransition: NSObject {
-    open var isPresenting: Bool
-    open fileprivate(set) var transitionPairs = [(UIView, UIView)]()
-    open var transitionSnapshot: UIView!
-    open let transitionBackgroundView = UIView()
-    open var toViewController: UIViewController!
-    open var fromViewController: UIViewController!
-    open var transitionContext: UIViewControllerContextTransitioning!
-    open var delay: TimeInterval = 0
-    open var duration: TimeInterval = 0.35
-    open var containerView: UIView!
-    open var transitionView = UIView()
-    public override init() {
-        isPresenting = false
-        super.init()
-    }
-    public init(isPresenting: Bool) {
-        self.isPresenting = isPresenting
-        super.init()
-    }
-    open var toView: UIView {
-        return toViewController.view
-    }
-    open var toSubviews: [UIView] {
-        return subviews(of: toView)
-    }
-    open var fromView: UIView {
-        return fromViewController.view
-    }
-    open var fromSubviews: [UIView] {
-        return subviews(of: fromView)
-    }
-    open func subviews(of view: UIView) -> [UIView] {
-        var views: [UIView] = []
-        subviews(of: view, views: &views)
-        return views
-    }
-    open func subviews(of view: UIView, views: inout [UIView]) {
-        for v in view.subviews {
-            if 0 < v.motionTransitionIdentifier.utf16.count {
-                views.append(v)
-            }
-            subviews(of: v, views: &views)
-        }
-    }
-}
-extension MotionTransition: UIViewControllerAnimatedTransitioning {
-    @objc(animateTransition:)
-    open func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
-        self.transitionContext = transitionContext
-        prepareToViewController()
-        prepareFromViewController()
-        prepareContainerView()
-        prepareTransitionSnapshot()
-        prepareTransitionPairs()
-        prepareTransitionView()
-        prepareTransitionBackgroundView()
-        prepareTransitionToView()
-        prepareTransitionAnimation()
-    }
-    @objc(transitionDuration:)
-    open func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
-        return delay + duration
-    }
-}
-extension MotionTransition {
-    fileprivate func prepareToViewController() {
-        guard let v = transitionContext.viewController(forKey: .to) else {
-            return
-        }
-        toViewController = v
-    }
-    fileprivate func prepareFromViewController() {
-        guard let v = transitionContext.viewController(forKey: .from) else {
-            return
-        }
-        fromViewController = v
-    }
-    fileprivate func prepareContainerView() {
-        containerView = transitionContext.containerView
-    }
-    fileprivate func prepareTransitionSnapshot() {
-        transitionSnapshot = fromView.motionTransitionSnapshot(afterUpdates: true)
-        transitionSnapshot.frame = containerView.bounds
-        containerView.addSubview(transitionSnapshot)
-    }
-    fileprivate func prepareTransitionPairs() {
-        for from in fromSubviews {
-            guard 0 < from.motionTransitionIdentifier.utf16.count else {
-                continue
-            }
-            for to in toSubviews {
-                guard to.motionTransitionIdentifier == from.motionTransitionIdentifier else {
-                    continue
-                }
-                transitionPairs.append((from, to))
-            }
-        }
-    }
-    fileprivate func prepareTransitionView() {
-        transitionView.frame = containerView.bounds
-        containerView.insertSubview(transitionView, belowSubview: transitionSnapshot)
-    }
-    fileprivate func prepareTransitionBackgroundView() {
-        transitionBackgroundView.backgroundColor = fromView.backgroundColor
-        transitionBackgroundView.frame = transitionView.bounds
-        transitionView.addSubview(transitionBackgroundView)
-    }
-    fileprivate func prepareTransitionToView() {
-        if isPresenting {
-            containerView.insertSubview(toView, belowSubview: transitionView)
-        }
-        toView.isHidden = false
-        toView.updateConstraints()
-        toView.setNeedsLayout()
-        toView.layoutIfNeeded()
-    }
-    fileprivate func prepareTransitionAnimation() {
-        addTransitionAnimations()
-        addBackgroundMotionAnimation()
-        cleanupAnimation()
-        hideFromView()
-        removeTransitionSnapshot()
-    }
-}
-extension MotionTransition {
-    fileprivate func addTransitionAnimations() {
-        for (from, to) in transitionPairs {
-            var snapshotAnimations = [CABasicAnimation]()
-            var snapshotChildAnimations = [CABasicAnimation]()
-            let sizeAnimation = Motion.size(to.bounds.size)
-            let cornerRadiusAnimation = Motion.corner(radius: to.cornerRadius)
-            snapshotAnimations.append(sizeAnimation)
-            snapshotAnimations.append(cornerRadiusAnimation)
-            snapshotAnimations.append(Motion.position(to: to.motionPosition))
-            snapshotAnimations.append(Motion.rotation(angle: to.motionRotationAngle))
-            snapshotAnimations.append(Motion.background(color: to.backgroundColor ?? .clear))
-            snapshotChildAnimations.append(cornerRadiusAnimation)
-            snapshotChildAnimations.append(sizeAnimation)
-            snapshotChildAnimations.append(Motion.position(x: to.bounds.width / 2, y: to.bounds.height / 2))
-            let d = motionDuration(animations: to.motionTransitionAnimations)
-            let snapshot = from.motionTransitionSnapshot(afterUpdates: true)
-            transitionView.addSubview(snapshot)
-            Motion.delay(motionDelay(animations: to.motionTransitionAnimations)) { [weak self, weak to] in
-                guard let s = self else {
-                    return
-                }
-                guard let v = to else {
-                    return
-                }
-                let tf = s.motionTimingFunction(animations: v.motionTransitionAnimations)
-                let snapshotGroup = Motion.animate(group: snapshotAnimations, duration: d)
-                snapshotGroup.fillMode = MotionAnimationFillModeToValue(mode: .forwards)
-                snapshotGroup.isRemovedOnCompletion = false
-                snapshotGroup.timingFunction = MotionAnimationTimingFunctionToValue(timingFunction: tf)
-                let snapshotChildGroup = Motion.animate(group: snapshotChildAnimations, duration: d)
-                snapshotChildGroup.fillMode = MotionAnimationFillModeToValue(mode: .forwards)
-                snapshotChildGroup.isRemovedOnCompletion = false
-                snapshotChildGroup.timingFunction = MotionAnimationTimingFunctionToValue(timingFunction: tf)
-                snapshot.animate(snapshotGroup)
-                snapshot.subviews.first!.animate(snapshotChildGroup)
-            }
-        }
-    }
-    fileprivate func addBackgroundMotionAnimation() {
-        transitionBackgroundView.motion(.backgroundColor(toView.backgroundColor ?? .clear), .duration(transitionDuration(using: transitionContext)))
-    }
-}
-extension MotionTransition {
-    fileprivate func motionDelay(animations: [MotionAnimation]) -> TimeInterval {
-        var t: TimeInterval = 0
-        for a in animations {
-            switch a {
-            case let .delay(time):
-                if time > delay {
-                    delay = time
-                }
-                t = time
-            default:break
-            }
-        }
-        return t
-    }
-    fileprivate func motionDuration(animations: [MotionAnimation]) -> TimeInterval {
-        var t: TimeInterval = 0.35
-        for a in animations {
-            switch a {
-            case let .duration(time):
-                if time > duration {
-                    duration = time
-                }
-                t = time
-            default:break
-            }
-        }
-        return t
-    }
-    fileprivate func motionTimingFunction(animations: [MotionAnimation]) -> MotionAnimationTimingFunction {
-        var t = MotionAnimationTimingFunction.easeInEaseOut
-        for a in animations {
-            switch a {
-            case let .timingFunction(timingFunction):
-                t = timingFunction
-            default:break
-            }
-        }
-        return t
-    }
-}
-extension MotionTransition {
-    fileprivate func cleanupAnimation() {
-        Motion.delay(transitionDuration(using: transitionContext)) { [weak self] in
-            guard let s = self else {
-                return
-            }
-            s.hideToSubviews()
-            s.clearTransitionView()
-            s.clearTransitionPairs()
-            s.completeTransition()
-        }
-    }
-    fileprivate func hideFromView() {
-        Motion.delay(delay) { [weak self] in
-            self?.fromView.isHidden = true
-        }
-    }
-    fileprivate func removeTransitionSnapshot() {
-        Motion.delay(delay) { [weak self] in
-            self?.transitionSnapshot.removeFromSuperview()
-        }
-    }
-    fileprivate func hideToSubviews() {
-        toSubviews.forEach {
-            $0.isHidden = false
-        }
-    }
-    fileprivate func clearTransitionPairs() {
-        transitionPairs.removeAll()
-    }
-    fileprivate func clearTransitionView() {
-        transitionView.removeFromSuperview()
-        transitionView.subviews.forEach {
-            $0.removeFromSuperview()
-        }
-    }
-    fileprivate func completeTransition() {
-        transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
-    }
-}
--- a/Sources/iOS/NavigationBar.swift
+++ b/Sources/iOS/NavigationBar.swift
@@ -98,8 +98,11 @@ open class NavigationBar: UINavigationBar {
 	/// A property that accesses the backing layer's background
 	@IBInspectable
    open override var backgroundColor: UIColor? {
-		didSet {
+        get {
-			barTintColor = backgroundColor
+            return barTintColor
+        }
+        set(value) {
+            barTintColor = value
        }
 	}