updated Motion identifier values and internal handling of associated objects

1dfc3fb8 · Daniel Dahan · 398021c6 · 1dfc3fb8 · 1dfc3fb8 · 1dfc3fb8
Commit 1dfc3fb8 authored Jun 06, 2017 by Daniel Dahan
10 changed files
--- a/Motion.xcodeproj/project.pbxproj
+++ b/Motion.xcodeproj/project.pbxproj
@@ -25,7 +25,6 @@
 		96AEB6951EE4610F009A3BE0 /* Motion+CALayer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB66F1EE4610F009A3BE0 /* Motion+CALayer.swift */; };
 		96AEB6961EE4610F009A3BE0 /* Motion+CAMediaTimingFunction.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB6701EE4610F009A3BE0 /* Motion+CAMediaTimingFunction.swift */; };
 		96AEB6971EE4610F009A3BE0 /* Motion+CG.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB6711EE4610F009A3BE0 /* Motion+CG.swift */; };
-		96AEB6981EE4610F009A3BE0 /* Motion+DispatchQueue.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB6721EE4610F009A3BE0 /* Motion+DispatchQueue.swift */; };
 		96AEB6991EE4610F009A3BE0 /* Motion+UIKit.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB6731EE4610F009A3BE0 /* Motion+UIKit.swift */; };
 		96AEB69A1EE4610F009A3BE0 /* Motion+UIView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB6741EE4610F009A3BE0 /* Motion+UIView.swift */; };
 		96AEB69B1EE4610F009A3BE0 /* Motion+UIViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 96AEB6751EE4610F009A3BE0 /* Motion+UIViewController.swift */; };
@@ -69,7 +68,6 @@
 		96AEB66F1EE4610F009A3BE0 /* Motion+CALayer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+CALayer.swift"; sourceTree = "<group>"; };
 		96AEB6701EE4610F009A3BE0 /* Motion+CAMediaTimingFunction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+CAMediaTimingFunction.swift"; sourceTree = "<group>"; };
 		96AEB6711EE4610F009A3BE0 /* Motion+CG.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+CG.swift"; sourceTree = "<group>"; };
-		96AEB6721EE4610F009A3BE0 /* Motion+DispatchQueue.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+DispatchQueue.swift"; sourceTree = "<group>"; };
 		96AEB6731EE4610F009A3BE0 /* Motion+UIKit.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+UIKit.swift"; sourceTree = "<group>"; };
 		96AEB6741EE4610F009A3BE0 /* Motion+UIView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+UIView.swift"; sourceTree = "<group>"; };
 		96AEB6751EE4610F009A3BE0 /* Motion+UIViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Motion+UIViewController.swift"; sourceTree = "<group>"; };
@@ -139,11 +137,10 @@
 				96AEB66F1EE4610F009A3BE0 /* Motion+CALayer.swift */,
 				96AEB6701EE4610F009A3BE0 /* Motion+CAMediaTimingFunction.swift */,
 				96AEB6711EE4610F009A3BE0 /* Motion+CG.swift */,
-				96AEB6721EE4610F009A3BE0 /* Motion+DispatchQueue.swift */,
+				963150D11EE50DA6002B0D42 /* Motion+Obj-C.swift */,
 				96AEB6731EE4610F009A3BE0 /* Motion+UIKit.swift */,
 				96AEB6741EE4610F009A3BE0 /* Motion+UIView.swift */,
 				96AEB6751EE4610F009A3BE0 /* Motion+UIViewController.swift */,
-				963150D11EE50DA6002B0D42 /* Motion+Obj-C.swift */,
 				963150D91EE51EB4002B0D42 /* MotionAnimationFillMode.swift */,
 			);
 			path = Extensions;
@@ -311,7 +308,6 @@
 				96AEB6961EE4610F009A3BE0 /* Motion+CAMediaTimingFunction.swift in Sources */,
 				96AEB6941EE4610F009A3BE0 /* Motion+Array.swift in Sources */,
 				96AEB6951EE4610F009A3BE0 /* Motion+CALayer.swift in Sources */,
-				96AEB6981EE4610F009A3BE0 /* Motion+DispatchQueue.swift in Sources */,
 				96AEB6A61EE4610F009A3BE0 /* MotionTypes.swift in Sources */,
 				96AEB68E1EE4610F009A3BE0 /* MotionCoreAnimationViewContext.swift in Sources */,
 				96AEB6921EE4610F009A3BE0 /* MotionDebugView.swift in Sources */,

--- a/Sources/Debug Plugin/MotionDebugView.swift
+++ b/Sources/Debug Plugin/MotionDebugView.swift
@@ -56,7 +56,7 @@ class MotionDebugView: UIView {
  }
  var showOnTop: Bool = false
-  var rotation: CGFloat = π / 6
+  var rotation: CGFloat = .pi / 6
  var scale: CGFloat = 0.6
  var translation: CGPoint = .zero
  var progress: Float {
@@ -145,10 +145,10 @@ class MotionDebugView: UIView {
      startRotation = rotation
    }
    rotation = startRotation + panGR.translation(in: nil).x / 150
-    if rotation > π {
+    if rotation > .pi {
-      rotation -= 2 * π
+      rotation -= 2 * .pi
-    } else if rotation < -π {
+    } else if rotation < -.pi {
-      rotation += 2 * π
+      rotation += 2 * .pi
    }
    delegate?.onPerspectiveChanged(translation:translation, rotation: rotation, scale:scale)
  }

--- a/Sources/Extensions/Motion+CG.swift
+++ b/Sources/Extensions/Motion+CG.swift
 /*
- * The MIT License (MIT)
+ * Copyright (C) 2015 - 2017, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
- *
- * Copyright (C) 2017, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
 * All rights reserved.
 *
- * Original Inspiration & Author
+ * Redistribution and use in source and binary forms, with or without
- * Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
+ * 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.
 *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
+ *	*	Redistributions in binary form must reproduce the above copyright notice,
- * of this software and associated documentation files (the "Software"), to deal
+ *		this list of conditions and the following disclaimer in the documentation
- * in the Software without restriction, including without limitation the rights
+ *		and/or other materials provided with the distribution.
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
 *
- * The above copyright notice and this permission notice shall be included in
+ *	*	Neither the name of CosmicMind nor the names of its
- * all copies or substantial portions of the Software.
+ *		contributors may be used to endorse or promote products derived from
+ *		this software without specific prior written permission.
 *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * THE SOFTWARE.
+ * 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 MetalKit
-let π = CGFloat.pi
 internal struct KeySet<Key: Hashable, Value: Hashable> {
-  var dict: [Key:Set<Value>] = [:]
+    /// A reference to the dictionary storing the key / Set pairs.
-  internal subscript(key: Key) -> Set<Value> {
+    fileprivate var dictionary = [Key: Set<Value>]()
+    /**
+     Subscript for matching keys and returning the corresponding set.
+     - Parameter key: A Key type.
+     - Returns: A Set<Value> type.
+     */
+    subscript(key: Key) -> Set<Value> {
        mutating get {
-      if dict[key] == nil {
+            if nil == dictionary[key] {
-        dict[key] = Set<Value>()
+                dictionary[key] = Set<Value>()
            }
-      return dict[key]!
+            return dictionary[key]!
        }
-    set {
+        set(value) {
-      dict[key] = newValue
+            dictionary[key] = value
        }
    }
 }
@@ -49,81 +57,91 @@ internal extension CGSize {
    internal var center: CGPoint {
        return CGPoint(x: width / 2, y: height / 2)
    }
    internal var point: CGPoint {
        return CGPoint(x: width, y: height)
    }
    internal func transform(_ t: CGAffineTransform) -> CGSize {
-    return self.applying(t)
+        return applying(t)
    }
    internal func transform(_ t: CATransform3D) -> CGSize {
-    return self.applying(CATransform3DGetAffineTransform(t))
+        return applying(CATransform3DGetAffineTransform(t))
    }
 }
 internal extension CGRect {
-  internal var center: CGPoint {
+    var center: CGPoint {
-    return CGPoint(x: origin.x + size.width/2, y: origin.y + size.height/2)
+        return CGPoint(x: origin.x + size.width / 2, y: origin.y + size.height / 2)
    }
-  internal var bounds: CGRect {
+    var bounds: CGRect {
        return CGRect(origin: CGPoint.zero, size: size)
    }
    init(center: CGPoint, size: CGSize) {
-    self.init(x: center.x - size.width/2, y: center.y - size.height/2, width: size.width, height: size.height)
+        self.init(x: center.x - size.width / 2, y: center.y - size.height / 2, width: size.width, height: size.height)
    }
 }
-extension CGFloat {
+internal extension CGFloat {
-  internal func clamp(_ a: CGFloat, _ b: CGFloat) -> CGFloat {
+    func clamp(_ a: CGFloat, _ b: CGFloat) -> CGFloat {
-    return self < a ? a : (self > b ? b : self)
+        return self < a ? a : self > b ? b : self
    }
 }
-extension CGPoint {
-  internal func translate(_ dx: CGFloat, dy: CGFloat) -> CGPoint {
+internal extension CGPoint {
-    return CGPoint(x: self.x+dx, y: self.y+dy)
+    func translate(_ dx: CGFloat, dy: CGFloat) -> CGPoint {
+        return CGPoint(x: x + dx, y: y + dy)
    }
-  internal func transform(_ t: CGAffineTransform) -> CGPoint {
+    func transform(_ t: CGAffineTransform) -> CGPoint {
-    return self.applying(t)
+        return applying(t)
    }
-  internal func transform(_ t: CATransform3D) -> CGPoint {
+    func transform(_ t: CATransform3D) -> CGPoint {
-    return self.applying(CATransform3DGetAffineTransform(t))
+        return applying(CATransform3DGetAffineTransform(t))
    }
-  internal func distance(_ b: CGPoint) -> CGFloat {
+    func distance(_ b: CGPoint) -> CGFloat {
-    return sqrt(pow(self.x - b.x, 2) + pow(self.y - b.y, 2))
+        return sqrt(pow(x - b.x, 2) + pow(y - b.y, 2))
    }
 }
-internal func + (left: CGPoint, right: CGPoint) -> CGPoint {
+internal func +(left: CGPoint, right: CGPoint) -> CGPoint {
    return CGPoint(x: left.x + right.x, y: left.y + right.y)
 }
-internal func - (left: CGPoint, right: CGPoint) -> CGPoint {
+internal func -(left: CGPoint, right: CGPoint) -> CGPoint {
    return CGPoint(x: left.x - right.x, y: left.y - right.y)
 }
-internal func / (left: CGPoint, right: CGFloat) -> CGPoint {
+internal func /(left: CGPoint, right: CGFloat) -> CGPoint {
-  return CGPoint(x: left.x/right, y: left.y/right)
+    return CGPoint(x: left.x / right, y: left.y / right)
 }
-internal func / (left: CGPoint, right: CGPoint) -> CGPoint {
-  return CGPoint(x: left.x/right.x, y: left.y/right.y)
+internal func /(left: CGPoint, right: CGPoint) -> CGPoint {
+    return CGPoint(x: left.x / right.x, y: left.y / right.y)
 }
-internal func * (left: CGPoint, right: CGFloat) -> CGPoint {
-  return CGPoint(x: left.x*right, y: left.y*right)
+internal func *(left: CGPoint, right: CGFloat) -> CGPoint {
+    return CGPoint(x: left.x * right, y: left.y * right)
 }
-internal func * (left: CGPoint, right: CGSize) -> CGPoint {
-  return CGPoint(x: left.x*right.width, y: left.y*right.width)
+internal func *(left: CGPoint, right: CGSize) -> CGPoint {
+    return CGPoint(x: left.x * right.width, y: left.y * right.width)
 }
-internal func * (left: CGFloat, right: CGPoint) -> CGPoint {
+internal func *(left: CGFloat, right: CGPoint) -> CGPoint {
    return right * left
 }
-internal func * (left: CGPoint, right: CGPoint) -> CGPoint {
+internal func *(left: CGPoint, right: CGPoint) -> CGPoint {
-  return CGPoint(x: left.x*right.x, y: left.y*right.y)
+    return CGPoint(x: left.x * right.x, y: left.y * right.y)
 }
-internal prefix func - (point: CGPoint) -> CGPoint {
+internal prefix func -(point: CGPoint) -> CGPoint {
    return CGPoint.zero - point
 }
@@ -131,14 +149,16 @@ internal func abs(_ p: CGPoint) -> CGPoint {
    return CGPoint(x: abs(p.x), y: abs(p.y))
 }
-internal func * (left: CGSize, right: CGFloat) -> CGSize {
+internal func *(left: CGSize, right: CGFloat) -> CGSize {
-  return CGSize(width: left.width*right, height: left.height*right)
+    return CGSize(width: left.width * right, height: left.height * right)
 }
-internal func * (left: CGSize, right: CGSize) -> CGSize {
-  return CGSize(width: left.width*right.width, height: left.height*right.width)
+internal func *(left: CGSize, right: CGSize) -> CGSize {
+    return CGSize(width: left.width * right.width, height: left.height * right.width)
 }
-internal func / (left: CGSize, right: CGSize) -> CGSize {
-  return CGSize(width: left.width/right.width, height: left.height/right.height)
+internal func /(left: CGSize, right: CGSize) -> CGSize {
+    return CGSize(width: left.width / right.width, height: left.height / right.height)
 }
 internal func == (lhs: CATransform3D, rhs: CATransform3D) -> Bool {

--- a/Sources/Extensions/Motion+DispatchQueue.swift
+++ b/Sources/Extensions/Motion+DispatchQueue.swift
-/*
- * The MIT License (MIT)
- *
- * Copyright (C) 2017, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
- * All rights reserved.
- *
- * Original Inspiration & Author
- * Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-import Foundation
-func delay(_ time: Double, execute: @escaping () -> Void) {
-  if time > 0 {
-    DispatchQueue.main.asyncAfter(deadline: .now() + time, execute: execute)
-  } else {
-    DispatchQueue.main.async(execute: execute)
-  }
-}
--- a/Sources/Extensions/Motion+UIView.swift
+++ b/Sources/Extensions/Motion+UIView.swift
@@ -51,49 +51,101 @@ internal extension UIView {
    }
 }
-public extension UIView {
+fileprivate var MotionInstanceKey: UInt8 = 0
-  private struct AssociatedKeys {
-    static var motionID    = "motionID"
+fileprivate struct MotionInstance {
-    static var motionModifiers = "motionModifers"
+    /// A boolean indicating whether Motion is enabled.
-    static var motionStoredAlpha = "motionStoredAlpha"
+    fileprivate var isEnabled: Bool
-    static var motionEnabled = "motionEnabled"
+    /// An optional reference to the motion identifier.
+    fileprivate var identifier: String?
+    /// An optional reference to the motion animations.
+    fileprivate var animations: [MotionAnimation]?
+    /// An optional reference to the motion transition animations.
+    fileprivate var transitions: [MotionTransition]?
+    /// An alpha value.
+    fileprivate var alpha: CGFloat?
+}
+extension UIView {
+    /// MotionInstance reference.
+    fileprivate var motionInstance: MotionInstance {
+        get {
+            return AssociatedObject.get(base: self, key: &MotionInstanceKey) {
+                return MotionInstance(isEnabled: true, identifier: nil, animations: nil, transitions: nil, alpha: 1)
+            }
+        }
+        set(value) {
+            AssociatedObject.set(base: self, key: &MotionInstanceKey, value: value)
+        }
    }
-  /**
+    /// A boolean that indicates whether motion is enabled.
-   **motionID** is the identifier for the view. When doing a transition between two view controllers,
+    @IBInspectable
-   Motion will search through all the subviews for both view controllers and matches views with the same **motionID**.
+    public var isMotionEnabled: Bool {
+        get {
+            return motionInstance.isEnabled
+        }
+        set(value) {
+            motionInstance.isEnabled = value
+        }
+    }
-   Whenever a pair is discovered,
+    /// An identifier value used to connect views across UIViewControllers.
-   Motion will automatically transit the views from source state to the destination state.
+    @IBInspectable
-   */
+    open var motionIdentifier: String? {
-  @IBInspectable public var motionID: String? {
+        get {
-    get { return objc_getAssociatedObject(self, &AssociatedKeys.motionID) as? String }
+            return motionInstance.identifier
-    set { objc_setAssociatedObject(self, &AssociatedKeys.motionID, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) }
+        }
+        set(value) {
+            motionInstance.identifier = value
+        }
    }
-  /**
+    /// The animations to run.
-   **isMotionEnabled** allows to specify whether a view and its subviews should be consider for animations.
+    open var motionAnimations: [MotionAnimation]? {
-   If true, Motion will search through all the subviews for motionIds and modifiers. Defaults to true
+        get {
-   */
+            return motionInstance.animations
-  @IBInspectable public var isMotionEnabled: Bool {
+        }
-    get { return objc_getAssociatedObject(self, &AssociatedKeys.motionEnabled) as? Bool ?? true }
+        set(value) {
-    set { objc_setAssociatedObject(self, &AssociatedKeys.motionEnabled, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) }
+            motionInstance.animations = value
+        }
    }
-  /**
+    /// The animations to run while in transition.
-   Use **motionModifiers** to specify animations alongside the main transition. Checkout `MotionTransition.swift` for available modifiers.
+    open var motionTransitions: [MotionTransition]? {
-   */
+        get {
-  public var motionModifiers: [MotionTransition]? {
+            return motionInstance.transitions
-    get { return objc_getAssociatedObject(self, &AssociatedKeys.motionModifiers) as? [MotionTransition] }
+        }
-    set { objc_setAssociatedObject(self, &AssociatedKeys.motionModifiers, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) }
+        set(value) {
+            motionInstance.transitions = value
        }
+    }
+    /// The animations to run while in transition.
+    @IBInspectable
+    open var motionAlpha: CGFloat? {
+        get {
+            return motionInstance.alpha
+        }
+        set(value) {
+            motionInstance.alpha = value
+        }
+    }
+}
+public extension UIView {
  /**
-   **motionModifierString** provides another way to set **motionModifiers**. It can be assigned through storyboard.
+   **motionModifierString** provides another way to set **motionTransitions**. It can be assigned through storyboard.
   */
  @IBInspectable public var motionModifierString: String? {
    get { fatalError("Reverse lookup is not supported") }
-    set { motionModifiers = newValue?.parse() }
+    set { motionTransitions = newValue?.parse() }
  }
  internal func slowSnapshotView() -> UIView {
@@ -117,54 +169,6 @@ public extension UIView {
    }
    return isHidden && (superview is UICollectionView || self is UITableViewCell) ? [] : ([self] + subviews.flatMap { $0.flattenedViewHierarchy })
  }
-  /// Used for .overFullScreen presentation
-  internal var motionStoredAlpha: CGFloat? {
-    get {
-      if let doubleValue = (objc_getAssociatedObject(self, &AssociatedKeys.motionStoredAlpha) as? NSNumber)?.doubleValue {
-        return CGFloat(doubleValue)
-      }
-      return nil
-    }
-    set {
-      if let newValue = newValue {
-        objc_setAssociatedObject(self, &AssociatedKeys.motionStoredAlpha, NSNumber(value:newValue.native), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
-      } else {
-        objc_setAssociatedObject(self, &AssociatedKeys.motionStoredAlpha, nil, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
-      }
-    }
-  }
-}
-fileprivate var MotionInstanceKey: UInt8 = 0
-fileprivate struct MotionInstance {
-    /// An optional reference to the motion animations.
-    fileprivate var animations: [MotionAnimation]?
-}
-extension UIView {
-    /// MotionInstance reference.
-    fileprivate var motionInstance: MotionInstance {
-        get {
-            return AssociatedObject.get(base: self, key: &MotionInstanceKey) {
-                return MotionInstance(animations: nil)
-            }
-        }
-        set(value) {
-            AssociatedObject.set(base: self, key: &MotionInstanceKey, value: value)
-        }
-    }
-    /// The animations to run.
-    open var motionAnimations: [MotionAnimation]? {
-        get {
-            return motionInstance.animations
-        }
-        set(value) {
-            motionInstance.animations = value
-        }
-    }
 }
 extension UIView {

--- a/Sources/Motion.swift
+++ b/Sources/Motion.swift
@@ -111,7 +111,7 @@ public extension Motion {
  }
  /// Set the default animation for next transition
-  /// This usually overrides rootView's motionModifiers during the transition
+  /// This usually overrides rootView's motionTransitions during the transition
  ///
  /// - Parameter animation: animation type
  func setDefaultAnimationForNextTransition(_ animation: MotionDefaultAnimationType) {

--- a/Sources/MotionContext.swift
+++ b/Sources/MotionContext.swift
@@ -29,8 +29,8 @@
 import UIKit
 public class MotionContext {
-  internal var motionIDToSourceView = [String: UIView]()
+  internal var motionIdentifierToSourceView = [String: UIView]()
-  internal var motionIDToDestinationView = [String: UIView]()
+  internal var motionIdentifierToDestinationView = [String: UIView]()
  internal var snapshotViews = [UIView: UIView]()
  internal var viewAlphas = [UIView: CGFloat]()
  internal var targetStates = [UIView: MotionTargetState]()
@@ -45,18 +45,18 @@ public class MotionContext {
  internal func set(fromViews: [UIView], toViews: [UIView]) {
    self.fromViews = fromViews
    self.toViews = toViews
-    process(views: fromViews, idMap: &motionIDToSourceView)
+    process(views: fromViews, idMap: &motionIdentifierToSourceView)
-    process(views: toViews, idMap: &motionIDToDestinationView)
+    process(views: toViews, idMap: &motionIdentifierToDestinationView)
  }
  internal func process(views: [UIView], idMap: inout [String: UIView]) {
    for view in views {
      view.layer.removeAllAnimations()
      if container.convert(view.bounds, from: view).intersects(container.bounds) {
-        if let motionID = view.motionID {
+        if let motionIdentifier = view.motionIdentifier {
-          idMap[motionID] = view
+          idMap[motionIdentifier] = view
        }
-        if let modifiers = view.motionModifiers {
+        if let modifiers = view.motionTransitions {
          targetStates[view] = MotionTargetState(modifiers: modifiers)
        }
      }
@@ -83,24 +83,24 @@ public class MotionContext {
 extension MotionContext {
  /**
-   - Returns: a source view matching the motionID, nil if not found
+   - Returns: a source view matching the motionIdentifier, nil if not found
   */
-  public func sourceView(for motionID: String) -> UIView? {
+  public func sourceView(for motionIdentifier: String) -> UIView? {
-    return motionIDToSourceView[motionID]
+    return motionIdentifierToSourceView[motionIdentifier]
  }
  /**
-   - Returns: a destination view matching the motionID, nil if not found
+   - Returns: a destination view matching the motionIdentifier, nil if not found
   */
-  public func destinationView(for motionID: String) -> UIView? {
+  public func destinationView(for motionIdentifier: String) -> UIView? {
-    return motionIDToDestinationView[motionID]
+    return motionIdentifierToDestinationView[motionIdentifier]
  }
  /**
-   - Returns: a view with the same motionID, but on different view controller, nil if not found
+   - Returns: a view with the same motionIdentifier, but on different view controller, nil if not found
   */
  public func pairedView(for view: UIView) -> UIView? {
-    if let id = view.motionID {
+    if let id = view.motionIdentifier {
      if sourceView(for: id) == view {
        return destinationView(for: id)
      } else if destinationView(for: id) == view {
@@ -237,7 +237,7 @@ extension MotionContext {
    }
    snapshot.frame = containerView.convert(view.bounds, from: view)
-    snapshot.motionID = view.motionID
+    snapshot.motionIdentifier = view.motionIdentifier
    hide(view: view)
@@ -352,16 +352,16 @@ extension MotionContext {
    return snapshots
  }
  internal func loadViewAlpha(rootView: UIView) {
-    if let storedAlpha = rootView.motionStoredAlpha {
+    if let storedAlpha = rootView.motionAlpha {
      rootView.alpha = storedAlpha
-      rootView.motionStoredAlpha = nil
+      rootView.motionAlpha = nil
    }
    for subview in rootView.subviews {
      loadViewAlpha(rootView: subview)
    }
  }
  internal func storeViewAlpha(rootView: UIView) {
-    rootView.motionStoredAlpha = viewAlphas[rootView]
+    rootView.motionAlpha = viewAlphas[rootView]
    for subview in rootView.subviews {
      storeViewAlpha(rootView: subview)
    }

--- a/Sources/MotionTransition+MotionStringConvertible.swift
+++ b/Sources/MotionTransition+MotionStringConvertible.swift
@@ -102,8 +102,8 @@ extension MotionTransition: MotionStringConvertible {
      }
      return .cascade(delta: parameters.getDouble(0) ?? 0.02, direction: cascadeDirection, delayMatchedViews:parameters.getBool(2) ?? false)
    case "source":
-      if let motionID = parameters.get(0)?.name {
+      if let motionIdentifier = parameters.get(0)?.name {
-        return .source(motionID: motionID)
+        return .source(motionIdentifier: motionIdentifier)
      }
    case "useGlobalCoordinateSpace":
      return .useGlobalCoordinateSpace

--- a/Sources/MotionTransition.swift
+++ b/Sources/MotionTransition.swift
@@ -408,7 +408,7 @@ extension MotionTransition {
 // other modifiers
 extension MotionTransition {
  /**
-   Transition from/to the state of the view with matching motionID
+   Transition from/to the state of the view with matching motionIdentifier
   Will also force the view to use global coordinate space.
   The following layer properties will be animated from the given view.
@@ -430,11 +430,11 @@ extension MotionTransition {
       borderColor
   - Parameters:
-     - motionID: the source view's motionId.
+     - motionIdentifier: the source view's motionId.
   */
-  public static func source(motionID: String) -> MotionTransition {
+  public static func source(motionIdentifier: String) -> MotionTransition {
    return MotionTransition { targetState in
-      targetState.source = motionID
+      targetState.source = motionIdentifier
    }
  }
@@ -531,12 +531,12 @@ extension MotionTransition {
  }
  /**
-   ignore all motionModifiers attributes for a view's direct subviews.
+   ignore all motionTransitions attributes for a view's direct subviews.
   */
  public static var ignoreSubviewModifiers: MotionTransition = .ignoreSubviewModifiers()
  /**
-   ignore all motionModifiers attributes for a view's subviews.
+   ignore all motionTransitions attributes for a view's subviews.
   - Parameters:
   - recursive: if false, will only ignore direct subviews' modifiers. default false.
   */

--- a/Sources/Preprocessors/MatchPreprocessor.swift
+++ b/Sources/Preprocessors/MatchPreprocessor.swift
@@ -31,7 +31,7 @@ import UIKit
 class MatchPreprocessor: BasePreprocessor {
  override func process(fromViews: [UIView], toViews: [UIView]) {
    for tv in toViews {
-      guard let id = tv.motionID, let fv = context.sourceView(for: id) else { continue }
+      guard let id = tv.motionIdentifier, let fv = context.sourceView(for: id) else { continue }
      var tvState = context[tv] ?? MotionTargetState()
      var fvState = context[fv] ?? MotionTargetState()