progression update for latest internal changes in Motion

Sources/Animator/MotionAnimator.swift

@@ -30,7 +30,7 @@ import UIKit
 
 public protocol MotionAnimator: class {
     /// A reference to Motion.
-    weak var motion: Motion! { get set }
+    weak var motion: MotionTransition! { get set }
     
     /// Cleans the contexts.
     func clean()
@@ -68,8 +68,8 @@ public protocol MotionAnimator: class {
     
     /**
      Applies the given state to the given view.
-     - Parameter state: A MotionTransitionState.
+     - Parameter state: A MotionModifier.
      - Parameter to view: A UIView.
      */
-    func apply(state: MotionTransitionState, to view: UIView)
+    func apply(state: MotionTargetState, to view: UIView)
 }

Sources/Animator/MotionAnimatorViewContext.swift

@@ -36,7 +36,7 @@ internal class MotionAnimatorViewContext {
     var snapshot: UIView
     
     /// The animation target state.
-    var targetState: MotionTransitionState
+    var targetState: MotionTargetState
     
     /// A boolean indicating if the view is appearing.
     var isAppearing: Bool
@@ -58,10 +58,10 @@ internal class MotionAnimatorViewContext {
      An initializer. 
      - Parameter animator: A MotionAnimator.
      - Parameter snapshot: A UIView.
-     - Parameter targetState: A MotionTransitionState.
+     - Parameter targetState: A MotionModifier.
      - Parameter isAppearing: A Boolean.
      */
-    required init(animator: MotionCoreAnimator, snapshot: UIView, targetState: MotionTransitionState, isAppearing: Bool) {
+    required init(animator: MotionCoreAnimator, snapshot: UIView, targetState: MotionTargetState, isAppearing: Bool) {
         self.animator = animator
         self.snapshot = snapshot
         self.targetState = targetState
@@ -77,11 +77,11 @@ internal class MotionAnimatorViewContext {
      A class function that determines if a view can be animated
      to a given state.
      - Parameter view: A UIView.
-     - Parameter state: A MotionTransitionState.
+     - Parameter state: A MotionModifier.
      - Parameter isAppearing: A boolean that determines whether the
      view is appearing.
      */
-    class func canAnimate(view: UIView, state: MotionTransitionState, isAppearing: Bool) -> Bool {
+    class func canAnimate(view: UIView, state: MotionTargetState, isAppearing: Bool) -> Bool {
         return false
     }
 
@@ -106,9 +106,9 @@ internal class MotionAnimatorViewContext {
 
     /**
      Applies the given state to the target state.
-     - Parameter state: A MotionTransitionState.
+     - Parameter state: A MotionModifier.
      */
-    func apply(state: MotionTransitionState) {}
+    func apply(state: MotionTargetState) {}
     
     /**
      Starts the animations with an appearing boolean flag.

Sources/Animator/MotionCoreAnimationViewContext.swift

@@ -30,7 +30,7 @@ import UIKit
 
 internal class MotionCoreAnimationViewContext: MotionAnimatorViewContext {
     /// The transition states.
-    fileprivate var transitionStates = [String: (Any?, Any?)]()
+    fileprivate var state = [String: (Any?, Any?)]()
     
     /// A reference to the animation timing function.
     fileprivate var timingFunction = CAMediaTimingFunction.standard
@@ -51,7 +51,7 @@ internal class MotionCoreAnimationViewContext: MotionAnimatorViewContext {
         overlayLayer = nil
     }
     
-    override class func canAnimate(view: UIView, state: MotionTransitionState, isAppearing: Bool) -> Bool {
+    override class func canAnimate(view: UIView, state: MotionTargetState, isAppearing: Bool) -> Bool {
         return  nil != state.position           ||
                 nil != state.size               ||
                 nil != state.transform          ||
@@ -70,13 +70,13 @@ internal class MotionCoreAnimationViewContext: MotionAnimatorViewContext {
                        state.forceAnimate
     }
     
-    override func apply(state: MotionTransitionState) {
+    override func apply(state: MotionTargetState) {
         let targetState = viewState(targetState: state)
         
         for (key, targetValue) in targetState {
-            if nil == transitionStates[key] {
+            if nil == state[key] {
                 let current = currentValue(for: key)
-                transitionStates[key] = (current, current)
+                state[key] = (current, current)
             }
             
             let oldAnimations = animations
@@ -87,8 +87,8 @@ internal class MotionCoreAnimationViewContext: MotionAnimatorViewContext {
     }
 
     override func resume(at elapsedTime: TimeInterval, isReversed: Bool) -> TimeInterval {
-        for (key, (fromValue, toValue)) in transitionStates {
-            transitionStates[key] = (currentValue(for: key), isReversed ? fromValue : toValue)
+        for (key, (fromValue, toValue)) in state {
+            state[key] = (currentValue(for: key), isReversed ? fromValue : toValue)
         }
         
         if isReversed {
@@ -125,26 +125,29 @@ internal class MotionCoreAnimationViewContext: MotionAnimatorViewContext {
     }
 
     override func startAnimations() -> TimeInterval {
-        if let beginState = targetState.beginState?.state {
+        if let beginStateModifiers = targetState.beginState {
+            let beginState = MotionTargetState(modifiers: beginStateModifiers)
+            
             let appeared = viewState(targetState: beginState)
+            
             for (k, v) in appeared {
                 snapshot.layer.setValue(v, forKeyPath: k)
             }
             
-            if let (k, v) = beginState.overlay {
+            if let (color, opacity) = beginState.overlay {
                 let overlay = getOverlayLayer()
-                overlay.backgroundColor = k
-                overlay.opacity = Float(v)
+                overlay.backgroundColor = color
+                overlay.opacity = Float(opacity)
             }
         }
         
         let disappeared = viewState(targetState: targetState)
-        for (k, v) in disappeared {
-            let isAppearingState = currentValue(for: k)
-            let toValue = isAppearing ? isAppearingState : v
-            let fromValue = !isAppearing ? isAppearingState : v
         
-            transitionStates[k] = (fromValue, toValue)
+        for (k, disappearedState) in disappeared {
+            let appearingState = currentValue(for: k)
+            let toValue = isAppearing ? appearingState : disappearedState
+            let fromValue = !isAppearing ? appearingState : disappearedState
+            state[k] = (fromValue, toValue)
         }
         
         return animate(delay: targetState.delay, duration: duration)
@@ -416,7 +419,7 @@ fileprivate extension MotionCoreAnimationViewContext {
         
         animations = []
         
-        for (key, (fromValue, toValue)) in transitionStates {
+        for (key, (fromValue, toValue)) in state {
             let neededTime = animate(key: key, beginTime: currentTime + delay, duration: duration, fromValue: fromValue, toValue: toValue)
             timeUntilStop = max(timeUntilStop, neededTime)
         }
@@ -426,10 +429,10 @@ fileprivate extension MotionCoreAnimationViewContext {
     
     /**
      Constructs a map of key paths to animation state values.
-     - Parameter targetState state: A MotionTransitionState.
+     - Parameter targetState state: A MotionModifier.
      - Returns: A map of key paths to animation values.
      */
-    func viewState(targetState ts: MotionTransitionState) -> [String: Any?] {
+    func viewState(targetState ts: MotionTargetState) -> [String: Any?] {
         var ts = ts
         var values = [String: Any?]()
         

Sources/Animator/MotionCoreAnimator.swift

@@ -29,7 +29,7 @@
 import UIKit
 
 class MotionCoreAnimator: MotionAnimator {
-    weak public var motion: Motion!
+    weak public var motion: MotionTransition!
     
     /// A reference to the MotionContext.
     public var context: MotionContext! {
@@ -52,7 +52,7 @@ class MotionCoreAnimator: MotionAnimator {
         return 0
     }
     
-    func apply(state: MotionTransitionState, to view: UIView) {}
+    func apply(state: MotionTargetState, to view: UIView) {}
 }
 
 

Sources/Animator/MotionTransitionAnimator.swift

@@ -28,7 +28,7 @@
 
 import UIKit
 
-internal class MotionTransitionAnimator<T: MotionAnimatorViewContext>: MotionCoreAnimator {
+internal class MotionTargetStateAnimator<T: MotionAnimatorViewContext>: MotionCoreAnimator {
     /// An index of views to their corresponding animator context.
     var viewToContexts = [UIView: T]()
 
@@ -132,10 +132,10 @@ internal class MotionTransitionAnimator<T: MotionAnimatorViewContext>: MotionCor
     
     /**
      Applies the given state to the given view.
-     - Parameter state: A MotionTransitionState.
+     - Parameter state: A MotionModifier.
      - Parameter to view: A UIView.
      */
-    override func apply(state: MotionTransitionState, to view: UIView) {
+    override func apply(state: MotionTargetState, to view: UIView) {
         guard let v = viewToContexts[view] else {
             return
         }
@@ -144,7 +144,7 @@ internal class MotionTransitionAnimator<T: MotionAnimatorViewContext>: MotionCor
     }
 }
 
-fileprivate extension MotionTransitionAnimator {
+fileprivate extension MotionTargetStateAnimator {
     /**
      Creates a view context for a given view.
      - Parameter view: A UIView.

Sources/Animator/MotionViewPropertyViewContext.swift

@@ -39,7 +39,7 @@ internal class MotionViewPropertyViewContext: MotionAnimatorViewContext {
     /// Starting effect.
     fileprivate var startEffect: UIVisualEffect?
     
-    override class func canAnimate(view: UIView, state: MotionTransitionState, isAppearing: Bool) -> Bool {
+    override class func canAnimate(view: UIView, state: MotionTargetState, isAppearing: Bool) -> Bool {
         return view is UIVisualEffectView && nil != state.opacity
     }
 

Sources/Extensions/Motion+UIView.swift

@@ -43,8 +43,8 @@ fileprivate struct AssociatedInstance {
     /// An optional reference to the motion animations.
     fileprivate var animations: [MotionAnimation]?
     
-    /// An optional reference to the motion transition animations.
-    fileprivate var transitions: [MotionTransition]?
+    /// An optional reference to the motion animation modifiers.
+    fileprivate var modifiers: [MotionModifier]?
     
     /// An alpha value.
     fileprivate var alpha: CGFloat?
@@ -55,7 +55,7 @@ fileprivate extension UIView {
     fileprivate var associatedInstance: AssociatedInstance {
         get {
             return AssociatedObject.get(base: self, key: &AssociatedInstanceKey) {
-                return AssociatedInstance(isEnabled: true, isEnabledForSubviews: true, identifier: nil, animations: nil, transitions: nil, alpha: 1)
+                return AssociatedInstance(isEnabled: true, isEnabledForSubviews: true, identifier: nil, animations: nil, modifiers: nil, alpha: 1)
             }
         }
         set(value) {
@@ -136,30 +136,30 @@ public extension UIView {
     }
     
     /**
-     A function that accepts a list of MotionTransition values.
-     - Parameter transitions: A list of MotionTransition values.
+     A function that accepts a list of MotionTargetState values.
+     - Parameter transitions: A list of MotionTargetState values.
      */
-    func transition(_ transitions: MotionTransition...) {
-        transition(transitions)
+    func transition(_ modifiers: MotionModifier...) {
+        transition(modifiers)
     }
     
     /**
-     A function that accepts an Array of MotionTransition values.
-     - Parameter transitions: An Array of MotionTransition values.
+     A function that accepts an Array of MotionTargetState values.
+     - Parameter transitions: An Array of MotionTargetState values.
      */
-    func transition(_ transitions: [MotionTransition]) {
-        motionTransitions = transitions
+    func transition(_ modifiers: [MotionModifier]) {
+        motionModifiers = modifiers
     }
 }
 
 internal extension UIView {
     /// The animations to run while in transition.
-    var motionTransitions: [MotionTransition]? {
+    var motionModifiers: [MotionModifier]? {
         get {
-            return associatedInstance.transitions
+            return associatedInstance.modifiers
         }
         set(value) {
-            associatedInstance.transitions = value
+            associatedInstance.modifiers = value
         }
     }
     
@@ -286,10 +286,10 @@ internal extension UIView {
     
     /**
      Calculates the optimized duration for a view.
-     - Parameter targetState: A MotionTransitionState.
+     - Parameter targetState: A MotionTargetState.
      - Returns: A TimeInterval.
      */
-    func optimizedDuration(targetState: MotionTransitionState) -> TimeInterval {
+    func optimizedDuration(targetState: MotionTargetState) -> TimeInterval {
         return optimizedDuration(position: targetState.position,
                                      size: targetState.size,
                                 transform: targetState.transform)

Sources/Extensions/Motion+UIViewController.swift

@@ -32,13 +32,13 @@ fileprivate var AssociatedInstanceKey: UInt8 = 0
 
 fileprivate struct AssociatedInstance {
     /// A reference to the modal animation.
-    var modalTransitionType: MotionTransitionType
+    var modalTransitionType: MotionTransitionAnimationType
 
     /// A reference to the navigation animation.
-    var navigationTransitionType: MotionTransitionType
+    var navigationTransitionType: MotionTransitionAnimationType
 
     /// A reference to the tabBar animation.
-    var tabBarTransitionType: MotionTransitionType
+    var tabBarTransitionType: MotionTransitionAnimationType
 
     /// A reference to the stored snapshot.
     var storedSnapshot: UIView?
@@ -75,7 +75,7 @@ extension UIViewController {
     }
 
     /// Default motion animation type for presenting & dismissing modally.
-    public var motionTransitionType: MotionTransitionType {
+    public var motionTransitionType: MotionTransitionAnimationType {
         get {
             return associatedInstance.modalTransitionType
         }
@@ -161,7 +161,7 @@ extension UIViewController {
 
 extension UINavigationController {
     /// Default motion animation type for push and pop within the navigation controller.
-    public var motionNavigationTransitionType: MotionTransitionType {
+    public var motionNavigationTransitionType: MotionTransitionAnimationType {
         get {
             return associatedInstance.navigationTransitionType
         }
@@ -173,7 +173,7 @@ extension UINavigationController {
 
 extension UITabBarController {
     /// Default motion animation type for switching tabs within the tab bar controller.
-    public var motionTabBarTransitionType: MotionTransitionType {
+    public var motionTabBarTransitionType: MotionTransitionAnimationType {
         get {
             return associatedInstance.tabBarTransitionType
         }

Sources/MotionContext.swift

@@ -45,7 +45,7 @@ public class MotionContext {
     internal var viewToAlphas = [UIView: CGFloat]()
     
     /// A reference of view to transition target state.
-    internal var viewToTargetState = [UIView: MotionTransitionState]()
+    internal var viewToTargetState = [UIView: MotionTargetState]()
     
     /// A reference of the superview to the subviews snapshots.
     internal var superviewToNoSnapshotSubviewMap = [UIView: [(Int, UIView)]]()
@@ -94,14 +94,21 @@ internal extension MotionContext {
         for v in views {
             v.layer.removeAllAnimations()
             
-            if container.convert(v.bounds, from: v).intersects(container.bounds) {
-                if let i = v.motionIdentifier {
-                    identifierMap[i] = v
+            let targetState: MotionTargetState?
+            
+            if let modifiers = v.motionModifiers {
+                targetState = MotionTargetState(modifiers: modifiers)
+            
+            } else {
+                targetState = nil
             }
             
-                if let i = v.motionTransitions {
-                    viewToTargetState[v] = MotionTransitionState(transitions: i)
+            if true == targetState?.forceAnimate || container.convert(v.bounds, from: v).intersects(container.bounds) {
+                if let motionIdentifier = v.motionIdentifier {
+                    identifierMap[motionIdentifier] = v
                 }
+            
+                viewToTargetState[v] = targetState
             }
         }
     }
@@ -110,11 +117,11 @@ internal extension MotionContext {
 public extension MotionContext {
     /**
      A subscript that takes a given view and retrieves a
-     MotionTransitionState if one exists.
+     MotionModifier if one exists.
      - Parameter view: A UIView.
-     - Returns: An optional MotionTransitionState.
+     - Returns: An optional MotionTargetState.
      */
-    subscript(view: UIView) -> MotionTransitionState? {
+    subscript(view: UIView) -> MotionTargetState? {
         get {
             return viewToTargetState[view]
         }

Sources/MotionPlugin.swift

@@ -125,27 +125,32 @@ class MotionPlugin: MotionCorePreprocessor, MotionAnimator {
        - state: the target state to override
        - view: the view to override
    */
-  open func apply(state: MotionTransitionState, to view: UIView) {}
+  open func apply(state: MotionTargetState, to view: UIView) {}
 }
 
 // methods for enable/disable the current plugin
 extension MotionPlugin {
+    /// A boolean indicating whether plugins are available.
     public static var isEnabled: Bool {
         get {
-      return Motion.isEnabled(plugin: self)
+            return MotionTransition.isEnabled(plugin: self)
         }
-    set {
-      if newValue {
+        set(value) {
+            if value {
                 enable()
             } else {
                 disable()
             }
         }
     }
+
+    /// Enable plugins.
     public static func enable() {
-    Motion.enable(plugin: self)
+        MotionTransition.enable(plugin: self)
     }
+
+    /// Disable plugins.
     public static func disable() {
-    Motion.disable(plugin: self)
+        MotionTransition.disable(plugin: self)
     }
 }

Sources/MotionState.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.
- */
-
-@objc(MotionState)
-public enum MotionState: Int {
-    /// Motion is able to start a new transition.
-    case possible
-    
-    /// UIKit has notified Motion about a pending transition.
-    /// Motion hasn't started preparation.
-    case notified
-    
-    /// Motion's `start` method has been called. Preparing the animation.
-    case starting
-    
-    /// Motions's `animate` method has been called. Animation has started.
-    case animating
-    
-    /// Motions's `complete` method has been called. Transition has ended or has
-    /// been cancelled. Motion is cleaning up.
-    case completing
-}
-

Sources/MotionTransitionState.swift → Sources/MotionTargetState.swift

@@ -28,28 +28,11 @@
 
 import UIKit
 
-internal class MotionTransitionStateWrapper {
-    /// A reference to a MotionTransitionState.
-    internal var state: MotionTransitionState
-    
-    /**
-     An initializer that accepts a given MotionTransitionState.
-     - Parameter state: A MotionTransitionState.
-     */
-    internal init(state: MotionTransitionState) {
-        self.state = state
-    }
-}
-
-public struct MotionTransitionState {
+public struct MotionTargetState {
     /// The initial state that the transition will start at.
-    internal var beginState: MotionTransitionStateWrapper?
-    
-    
-    public var conditionalTransitions: [((MotionConditionalContext) -> Bool, [MotionTransition])]?
+    internal var beginState: [MotionModifier]?
     
-    /// The start state if there is a match in the desition view controller.
-    public var beginStateIfMatched: [MotionTransition]?
+    public var conditionalModifiers: [((MotionConditionalContext) -> Bool, [MotionModifier])]?
     
     /// A reference to the position.
     public var position: CGPoint?
@@ -154,29 +137,29 @@ public struct MotionTransitionState {
     public var custom: [String: Any]?
 
     /**
-     An initializer that accepts an Array of MotionTransitions.
-     - Parameter transitions: An Array of MotionTransitions.
+     An initializer that accepts an Array of MotionTargetStates.
+     - Parameter transitions: An Array of MotionTargetStates.
      */
-    init(transitions: [MotionTransition]) {
-        append(contentsOf: transitions)
+    init(modifiers: [MotionModifier]) {
+        append(contentsOf: modifiers)
     }
 }
 
-extension MotionTransitionState {
+extension MotionTargetState {
     /**
-     Adds a MotionTransition to the current state.
-     - Parameter _ element: A MotionTransition.
+     Adds a MotionTargetState to the current state.
+     - Parameter _ modifier: A MotionTargetState.
      */
-    public mutating func append(_ element: MotionTransition) {
-        element.apply(&self)
+    public mutating func append(_ modifier: MotionModifier) {
+        modifier.apply(&self)
     }
     
     /**
-     Adds an Array of MotionTransitions to the current state.
-     - Parameter contentsOf elements: An Array of MotionTransitions.
+     Adds an Array of MotionTargetStates to the current state.
+     - Parameter contentsOf modifiers: An Array of MotionTargetStates.
      */
-    public mutating func append(contentsOf elements: [MotionTransition]) {
-        for v in elements {
+    public mutating func append(contentsOf modifiers: [MotionModifier]) {
+        for v in modifiers {
             v.apply(&self)
         }
     }
@@ -200,12 +183,12 @@ extension MotionTransitionState {
     }
 }
 
-extension MotionTransitionState: ExpressibleByArrayLiteral {
+extension MotionTargetState: ExpressibleByArrayLiteral {
     /**
      An initializer implementing the ExpressibleByArrayLiteral protocol.
-     - Parameter arrayLiteral elements: A list of MotionTransitions.
+     - Parameter arrayLiteral elements: A list of MotionTargetStates.
      */
-    public init(arrayLiteral elements: MotionTransition...) {
+    public init(arrayLiteral elements: MotionModifier...) {
         append(contentsOf: elements)
     }
 }

Sources/MotionTransitionObserver.swift

@@ -28,11 +28,11 @@
 
 import Foundation
 
-public protocol MotionTransitionObserver {
+public protocol MotionTargetStateObserver {
     /**
      Executed when the elapsed time changes during a transition.
-     - Parameter transitionObserver: A MotionTransitionObserver. 
+     - Parameter transitionObserver: A MotionTargetStateObserver. 
      - Parameter didUpdateWith elapsedTime: A TimeInterval.
      */
-    func motion(transitionObserver: MotionTransitionObserver, didUpdateWith elapsedTime: TimeInterval)
+    func motion(transitionObserver: MotionTargetStateObserver, didUpdateWith elapsedTime: TimeInterval)
 }

Sources/Preprocessors/ConditionalPreprocessor.swift

@@ -29,7 +29,7 @@
 import UIKit
 
 public struct MotionConditionalContext {
-    internal weak var motion: Motion!
+    internal weak var motion: MotionTransition!
     public weak var view: UIView!
     
     public private(set) var isAppearing: Bool
@@ -97,11 +97,11 @@ class ConditionalPreprocessor: MotionCorePreprocessor {
     
     func process(views: [UIView], isAppearing: Bool) {
         for v in views {
-            guard let conditionalTransitions = context[v]?.conditionalTransitions else {
+            guard let conditionalModifiers = context[v]?.conditionalModifiers else {
                 continue
             }
             
-            for (condition, transitions) in conditionalTransitions {
+            for (condition, transitions) in conditionalModifiers {
                 if condition(MotionConditionalContext(motion: motion, view: v, isAppearing: isAppearing)) {
                     context[v]!.append(contentsOf: transitions)
                 }

Sources/Preprocessors/MatchPreprocessor.swift

@@ -40,8 +40,8 @@ class MatchPreprocessor: MotionCorePreprocessor {
                 continue
             }
             
-            var tvState = context[tv] ?? MotionTransitionState()
-            var fvState = context[fv] ?? MotionTransitionState()
+            var tvState = context[tv] ?? MotionTargetState()
+            var fvState = context[fv] ?? MotionTargetState()
             
             // match is just a two-way source effect
             tvState.motionIdentifier = motionIdentifier

Sources/Preprocessors/MotionCorePreprocessor.swift

@@ -29,11 +29,11 @@
 import UIKit
 
 class MotionCorePreprocessor: MotionPreprocessor {
-    weak public var motion: Motion!
+    weak public var motion: MotionTransition!
     
     /// A reference to the MotionContext.
     public var context: MotionContext! {
-        return motion?.context
+        return motion!.context
     }
     
     func process(fromViews: [UIView], toViews: [UIView]) {}

Sources/Preprocessors/MotionPreprocessor.swift

@@ -30,7 +30,7 @@ import UIKit
 
 public protocol MotionPreprocessor: class {
     /// A reference to Motion.
-    weak var motion: Motion! { get set }
+    weak var motion: MotionTransition! { get set }
     
     /**
      Processes the transitionary views.

Sources/Preprocessors/TransitionPreprocessor.swift

@@ -28,7 +28,7 @@
 
 import UIKit
 
-public enum MotionTransitionType {
+public enum MotionTransitionAnimationType {
     public enum Direction {
         case left
         case right
@@ -50,19 +50,19 @@ public enum MotionTransitionType {
     case zoom
     case zoomOut
 
-    indirect case selectBy(presenting: MotionTransitionType, dismissing: MotionTransitionType)
+    indirect case selectBy(presenting: MotionTransitionAnimationType, dismissing: MotionTransitionAnimationType)
 
     /**
      Sets the presenting and dismissing transitions.
-     - Parameter presenting: A MotionTransitionType.
-     - Returns: A MotionTransitionType.
+     - Parameter presenting: A MotionTransitionAnimationType.
+     - Returns: A MotionTransitionAnimationType.
     */
-    public static func autoReverse(presenting: MotionTransitionType) -> MotionTransitionType {
+    public static func autoReverse(presenting: MotionTransitionAnimationType) -> MotionTransitionAnimationType {
         return .selectBy(presenting: presenting, dismissing: presenting.reversed())
     }
 
     /// Returns a reversal transition.
-    func reversed() -> MotionTransitionType {
+    func reversed() -> MotionTransitionAnimationType {
         switch self {
         case .push(direction: .up):
             return .pull(direction: .down)
@@ -218,7 +218,9 @@ class TransitionPreprocessor: MotionCorePreprocessor {
         }
 
         if case .auto = defaultAnimation {
-            if animators.contains(where: { $0.canAnimate(view: tv, isAppearing: true) || $0.canAnimate(view: fv, isAppearing: false) }) {
+            if animators.contains(where: {
+                $0.canAnimate(view: tv, isAppearing: true) || $0.canAnimate(view: fv, isAppearing: false)
+            }) {
                 defaultAnimation = .none
 
             } else if isNavigationController {
@@ -239,7 +241,7 @@ class TransitionPreprocessor: MotionCorePreprocessor {
         context[fv] = [.timingFunction(.standard), .duration(0.35)]
         context[tv] = [.timingFunction(.standard), .duration(0.35)]
 
-        let shadowState: [MotionTransition] = [.shadow(opacity: 0.5),
+        let shadowState: [MotionModifier] = [.shadow(opacity: 0.5),
                                              .shadow(color: .black),
                                              .shadow(radius: 5),
                                              .shadow(offset: .zero),
@@ -247,6 +249,8 @@ class TransitionPreprocessor: MotionCorePreprocessor {
 
         switch defaultAnimation {
         case .push(let direction):
+            context.insertToViewFirst = false
+            
             context[tv]!.append(contentsOf: [.translate(shift(direction: direction, isAppearing: true)),
                                              .shadow(opacity: 0),
                                              .beginWith(transitions: shadowState),
@@ -277,6 +281,8 @@ class TransitionPreprocessor: MotionCorePreprocessor {
             context[tv]!.append(contentsOf: [.translate(shift(direction: direction, isAppearing: true)), .scale(0.8)])
 
         case .cover(let direction):
+            context.insertToViewFirst = false
+            
             context[tv]!.append(contentsOf: [.translate(shift(direction: direction, isAppearing: true)),
                                              .shadow(opacity: 0),
                                              .beginWith(transitions: shadowState),
@@ -295,6 +301,8 @@ class TransitionPreprocessor: MotionCorePreprocessor {
             context[tv]!.append(contentsOf: [.overlay(color: .black, opacity: 0.1)])
 
         case .pageIn(let direction):
+            context.insertToViewFirst = false
+            
             context[tv]!.append(contentsOf: [.translate(shift(direction: direction, isAppearing: true)),
                                              .shadow(opacity: 0),
                                              .beginWith(transitions: shadowState),
@@ -333,10 +341,13 @@ class TransitionPreprocessor: MotionCorePreprocessor {
 
         case .zoom:
             context.insertToViewFirst = true
+            
             context[fv]!.append(contentsOf: [.scale(1.3), .fadeOut])
             context[tv]!.append(contentsOf: [.scale(0.7)])
 
         case .zoomOut:
+            context.insertToViewFirst = false
+            
             context[tv]!.append(contentsOf: [.scale(1.3), .fadeOut])
             context[fv]!.append(contentsOf: [.scale(0.7)])
 
@@ -347,7 +358,7 @@ class TransitionPreprocessor: MotionCorePreprocessor {
 
     /**
      Shifts the transition by a given size.
-     - Parameter direction: A MotionTransitionType.Direction.
+     - Parameter direction: A MotionTransitionAnimationType.Direction.
      - Parameter isAppearing: A boolean indicating whether it is appearing
      or not.
      - Parameter size: An optional CGSize.
@@ -355,7 +366,7 @@ class TransitionPreprocessor: MotionCorePreprocessor {
      and `y` point for `x`.
      - Returns: A CGPoint.
      */
-    func shift(direction: MotionTransitionType.Direction, isAppearing: Bool, size: CGSize? = nil, transpose: Bool = false) -> CGPoint {
+    func shift(direction: MotionTransitionAnimationType.Direction, isAppearing: Bool, size: CGSize? = nil, transpose: Bool = false) -> CGPoint {
         let size = size ?? context.container.bounds.size
         let point: CGPoint
 

Sources/Motion+Animate.swift → Sources/Transition/MotionTransition+Animate.swift

@@ -28,7 +28,7 @@
 
 import UIKit
 
-extension Motion {
+extension MotionTransition {
     /// Starts the transition animation.
     func animate() {
         guard .starting == state else {
@@ -85,7 +85,6 @@ extension Motion {
                 return animator.canAnimate(view: $0, isAppearing: true)
             })
             
-            print("T", t, "DURATION", duration)
             if .infinity == duration {
                 animatorWantsInteractive = true
             } else {
@@ -95,12 +94,10 @@ extension Motion {
         
         totalDuration = t
         
-        print("T", t)
-        
         if let forceFinishing = forceFinishing {
             complete(isFinishing: forceFinishing)
         } else if let startingProgress = startingProgress {
-           update(elapsedTime: startingProgress)
+           update(startingProgress)
         } else if animatorWantsInteractive {
             update(elapsedTime: 0)
         } else {

Sources/Motion+Complete.swift → Sources/Transition/MotionTransition+Complete.swift

@@ -28,7 +28,7 @@
 
 import UIKit
 
-extension Motion {
+extension MotionTransition {
     /**
      Complete the transition.
      - Parameter after: A TimeInterval.
@@ -36,7 +36,7 @@ extension Motion {
      has completed.
      */
     func complete(after: TimeInterval, isFinishing: Bool) {
-        guard [MotionState.animating, .starting, .notified].contains(state) else {
+        guard [MotionTransitionState.animating, .starting, .notified].contains(state) else {
             return
         }
         

Sources/Motion+Start.swift → Sources/Transition/MotionTransition+Start.swift

@@ -28,7 +28,7 @@
 
 import UIKit
 
-extension Motion {
+extension MotionTransition {
     /// Starts the transition animation.
     func start() {
         guard .notified == state else {
@@ -55,7 +55,7 @@ extension Motion {
     }
 }
 
-fileprivate extension Motion {
+fileprivate extension MotionTransition {
     /// Prepares the views frames.
     func prepareViewFrame() {
         guard let fv = fromView else {
@@ -119,10 +119,10 @@ fileprivate extension Motion {
     
     /// Prepares the animators.
     func prepareAnimators() {
-        animators.append(MotionTransitionAnimator<MotionCoreAnimationViewContext>())
+        animators.append(MotionTargetStateAnimator<MotionCoreAnimationViewContext>())
         
         if #available(iOS 10, tvOS 10, *) {
-            animators.append(MotionTransitionAnimator<MotionViewPropertyViewContext>())
+            animators.append(MotionTargetStateAnimator<MotionViewPropertyViewContext>())
         }
         
         for v in animators {
@@ -132,7 +132,7 @@ fileprivate extension Motion {
     
     /// Prepares the plugins.
     func preparePlugins() {
-        for x in Motion.enabledPlugins.map({
+        for x in MotionTransition.enabledPlugins.map({
             return $0.init()
         }) {
             plugins.append(x)
@@ -162,7 +162,7 @@ fileprivate extension Motion {
         container = UIView(frame: transitionContainer?.bounds ?? .zero)
         
         if !toOverFullScreen && !fromOverFullScreen {
-            updateContainerBackgroundColor()
+            container.backgroundColor = containerBackgroundColor
         }
         
         transitionContainer?.addSubview(container)
@@ -243,7 +243,7 @@ fileprivate extension Motion {
     }
 }
 
-fileprivate extension Motion {
+fileprivate extension MotionTransition {
     /// Executes the preprocessors' process function.
     func processPreprocessors() {
         for v in preprocessors {