Adds ability to animate contents of C4Image

C4/UI/C4Image.swift

@@ -57,6 +57,29 @@ public struct Pixel {
 /// A C4Image provides a view-based container for displaying a single image. You can create images from files, from other image objects, or from raw image data you receive.
 public class C4Image: C4View {
 
+    internal class ImageView : UIImageView {
+        var imageLayer: C4Layer {
+            get {
+                return self.layer as! C4Layer
+            }
+        }
+
+        override class func layerClass() -> AnyClass {
+            return C4Layer.self
+        }
+    }
+
+    /// C4Shape's contents are drawn on a C4ShapeLayer.
+    public var imageLayer: C4Layer {
+        get {
+            return self.imageView.imageLayer
+        }
+    }
+
+    internal var imageView: ImageView {
+        return self.view as! ImageView
+    }
+
     //MARK: Initializers
 
     /// Initializes a new C4Image using the specified filename from the bundle (i.e. your project), it will also grab images
@@ -102,7 +125,7 @@ public class C4Image: C4View {
     convenience public init(image: C4Image) {
         self.init()
         let uiimage = image.uiimage
-        self.view = UIImageView(image: uiimage)
+        self.view = ImageView(image: uiimage)
     }
 
     /// Initializes a new C4Image using a UIImage.
@@ -135,9 +158,9 @@ public class C4Image: C4View {
 
         if scale != 1.0 {
             let scaledImage = UIImage(CGImage: uiimage.CGImage!, scale: CGFloat(scale), orientation: uiimage.imageOrientation)
-            self.view = UIImageView(image: scaledImage)
+            self.view = ImageView(image: scaledImage)
         } else {
-            self.view = UIImageView(image: uiimage)
+            self.view = ImageView(image: uiimage)
         }
         _originalSize = C4Size(view.frame.size)
     }
@@ -300,7 +323,7 @@ public class C4Image: C4View {
     /// Returns the UIImageView of the object.
     ///
     /// - returns: A UIImageView object.
-    internal var imageView : UIImageView {
+    internal var uiimageView : UIImageView {
         get {
             return self.view as! UIImageView
         }

C4/UI/C4Layer.swift

@@ -0,0 +1,28 @@
+//
+//  C4ImageLayer.swift
+//  C4iOS
+//
+//  Created by travis on 2016-01-04.
+//  Copyright © 2016 C4. All rights reserved.
+//
+
+import QuartzCore
+
+public class C4Layer: CALayer {
+    ///  Configures basic options for a CABasicAnimation.
+    ///
+    ///  The options set in this method are favorable for the inner workings of C4's animation behaviours.
+    public override func actionForKey(key: String) -> CAAction? {
+        if C4ShapeLayer.disableActions == true {
+            return nil
+        }
+
+        if key == "contents" {
+            let animation = CABasicAnimation(keyPath: key)
+            animation.configureOptions()
+            animation.fromValue = self.contents
+            return animation;
+        }
+        return super.actionForKey(key)
+    }
+}

C4iOS.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		1F5486A41C3B9EF4005CEF19 /* C4Layer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1F5486A31C3B9EF4005CEF19 /* C4Layer.swift */; };
 		1F8252CC1BB3C65E0090E98A /* C4Timer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1F8252CB1BB3C65E0090E98A /* C4Timer.swift */; };
 		61BBAF631BC372BD00A03FD0 /* C4StoredAnimation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 61BBAF621BC372BD00A03FD0 /* C4StoredAnimation.swift */; };
 		61BBAF651BC38C1200A03FD0 /* C4View+KeyValues.swift in Sources */ = {isa = PBXBuildFile; fileRef = 61BBAF641BC38C1200A03FD0 /* C4View+KeyValues.swift */; };
@@ -122,6 +123,7 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		1F5486A31C3B9EF4005CEF19 /* C4Layer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = C4Layer.swift; sourceTree = "<group>"; };
 		1F8252CB1BB3C65E0090E98A /* C4Timer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = C4Timer.swift; sourceTree = "<group>"; };
 		1F8CB1D91A05781700A20783 /* C4RectTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = C4RectTests.swift; sourceTree = "<group>"; };
 		614F824319DB5ED3001DF1D4 /* C4.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = C4.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -339,6 +341,7 @@
 				A9D4F68A1B534F9F00F937AB /* C4Image+Filter.swift */,
 				A9D4F68B1B534F9F00F937AB /* C4Image+Generator.swift */,
 				A9D4F68C1B534F9F00F937AB /* C4Image.swift */,
+				1F5486A31C3B9EF4005CEF19 /* C4Layer.swift */,
 				A9D4F68D1B534F9F00F937AB /* C4Line.swift */,
 				A9D4F68E1B534F9F00F937AB /* C4Movie.swift */,
 				A9D4F68F1B534F9F00F937AB /* C4Polygon.swift */,
@@ -528,6 +531,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				1F5486A41C3B9EF4005CEF19 /* C4Layer.swift in Sources */,
 				A9D4F6C81B534F9F00F937AB /* C4Line.swift in Sources */,
 				A9D4F6B01B534F9F00F937AB /* C4Math.swift in Sources */,
 				A9D4F6CD1B534F9F00F937AB /* C4RegularPolygon.swift in Sources */,