Remove delegate
This commit is contained in:
Tony DiPasquale
parent
a885c995e9
commit
a2894d59cd
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@ -9,7 +9,6 @@
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/* Begin PBXBuildFile section */
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005656ED1A6F14D6008A0ED1 /* Animator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 005656EC1A6F14D6008A0ED1 /* Animator.swift */; };
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005656EF1A6F1C26008A0ED1 /* AnimatableImageView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 005656EE1A6F1C26008A0ED1 /* AnimatableImageView.swift */; };
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005656F11A7042E9008A0ED1 /* Animatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 005656F01A7042E9008A0ED1 /* Animatable.swift */; };
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00B8C75F1A364DCE00C188E7 /* ImageSourceHelpers.swift in Sources */ = {isa = PBXBuildFile; fileRef = 00B8C75C1A364DCE00C188E7 /* ImageSourceHelpers.swift */; };
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00B8C7961A3650EE00C188E7 /* Gifu.h in Headers */ = {isa = PBXBuildFile; fileRef = 00B8C7951A3650EE00C188E7 /* Gifu.h */; settings = {ATTRIBUTES = (Public, ); }; };
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EA1E21131AD5D369000459BD /* Runes.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = EA1E21121AD5D369000459BD /* Runes.framework */; };
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@ -21,7 +20,6 @@
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/* Begin PBXFileReference section */
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005656EC1A6F14D6008A0ED1 /* Animator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Animator.swift; sourceTree = "<group>"; };
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005656EE1A6F1C26008A0ED1 /* AnimatableImageView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AnimatableImageView.swift; sourceTree = "<group>"; };
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005656F01A7042E9008A0ED1 /* Animatable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Animatable.swift; sourceTree = "<group>"; };
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00B8C73E1A364DA400C188E7 /* Gifu.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Gifu.framework; sourceTree = BUILT_PRODUCTS_DIR; };
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00B8C7421A364DA400C188E7 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = Info.plist; path = ../Source/Info.plist; sourceTree = "<group>"; };
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00B8C75C1A364DCE00C188E7 /* ImageSourceHelpers.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ImageSourceHelpers.swift; sourceTree = "<group>"; };
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@ -77,7 +75,6 @@
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005656EE1A6F1C26008A0ED1 /* AnimatableImageView.swift */,
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EAF49CB01A3B6EEB00B395DF /* AnimatedFrame.swift */,
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005656EC1A6F14D6008A0ED1 /* Animator.swift */,
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005656F01A7042E9008A0ED1 /* Animatable.swift */,
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00B8C7951A3650EE00C188E7 /* Gifu.h */,
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00B8C75C1A364DCE00C188E7 /* ImageSourceHelpers.swift */,
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EAF49C7E1A3A4DE000B395DF /* UIImageExtension.swift */,
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@ -175,7 +172,6 @@
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005656EF1A6F1C26008A0ED1 /* AnimatableImageView.swift in Sources */,
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005656ED1A6F14D6008A0ED1 /* Animator.swift in Sources */,
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EAF49CB11A3B6EEB00B395DF /* AnimatedFrame.swift in Sources */,
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005656F11A7042E9008A0ED1 /* Animatable.swift in Sources */,
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00B8C75F1A364DCE00C188E7 /* ImageSourceHelpers.swift in Sources */,
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EAF49C811A3A4FAA00B395DF /* Curry.swift in Sources */,
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EAF49C7F1A3A4DE000B395DF /* UIImageExtension.swift in Sources */,
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@ -1,7 +0,0 @@
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/// Protocol that requires its members to have a `layer`, `frame`, and `contentMode` property.
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/// Classes confirming to this protocol can serve as a delegate to `Animator`.
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protocol Animatable {
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var layer: CALayer { get }
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var frame: CGRect { get }
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var contentMode: UIViewContentMode { get }
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}
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@ -3,9 +3,11 @@ import Runes
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import UIKit
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/// A subclass of `UIImageView` that can be animated using an image name string or raw data.
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public class AnimatableImageView: UIImageView, Animatable {
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public class AnimatableImageView: UIImageView {
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/// An `Animator` instance that holds the frames of a specific image in memory.
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var animator: Animator?
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/// A display link that keeps calling the `updateFrame` method on every screen refresh.
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private lazy var displayLink: CADisplayLink = CADisplayLink(target: self, selector: Selector("updateFrame"))
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deinit {
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println("deinit animatable view")
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@ -13,7 +15,7 @@ public class AnimatableImageView: UIImageView, Animatable {
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/// A computed property that returns whether the image view is animating.
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public var isAnimatingGIF: Bool {
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return animator?.isAnimating ?? isAnimating()
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return !displayLink.paused
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}
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/// Prepares the frames using a GIF image file name, without starting the animation.
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@ -30,7 +32,8 @@ public class AnimatableImageView: UIImageView, Animatable {
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/// :param: data GIF image data.
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public func prepareForAnimation(imageData data: NSData) {
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image = UIImage(data: data)
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animator = Animator(data: data, delegate: self)
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animator = Animator(data: data, size: frame.size, contentMode: contentMode)
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attachDisplayLink()
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}
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/// Prepares the frames using a GIF image file name and starts animating the image view.
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@ -54,18 +57,35 @@ public class AnimatableImageView: UIImageView, Animatable {
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image = animator?.currentFrame
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}
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/// Update the current frame with the displayLink duration
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func updateFrame() {
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if animator?.updateCurrentFrame(displayLink.duration) ?? false {
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layer.setNeedsDisplay()
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}
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}
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/// Starts the image view animation.
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public func startAnimatingGIF() {
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animator?.resumeAnimation() ?? startAnimating()
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if animator?.isAnimatable ?? false {
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displayLink.paused = false
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}
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}
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/// Stops the image view animation.
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public func stopAnimatingGIF() {
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animator?.pauseAnimation() ?? stopAnimating()
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displayLink.paused = true
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cleanup()
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}
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/// Cleanup the animator to reduce memory.
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public func cleanup() {
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image = .None
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animator = .None
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}
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/// Attaches the dsiplay link.
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func attachDisplayLink() {
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displayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)
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}
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}
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@ -4,12 +4,14 @@ import Runes
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/// Responsible for storing and updating the frames of a `AnimatableImageView` instance via delegation.
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class Animator: NSObject {
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/// The animator delegate. Should conform to the `Animatable` protocol.
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let delegate: Animatable
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/// Maximum duration to increment the frame timer with.
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private let maxTimeStep = 1.0
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/// An array of animated frames from a single GIF image.
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private var animatedFrames = [AnimatedFrame]()
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/// The size to resize all frames to
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private let size: CGSize
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/// The content mode to use when resizing
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private let contentMode: UIViewContentMode
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/// Maximum number of frames to load at once
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private let maxNumberOfFrames = 50
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/// The total number of frames in the GIF.
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@ -20,30 +22,28 @@ class Animator: NSObject {
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private var currentFrameIndex = 0
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/// Time elapsed since the last frame change. Used to determine when the frame should be updated.
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private var timeSinceLastFrameChange: NSTimeInterval = 0.0
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/// A display link that keeps calling the `updateCurrentFrame` method on every screen refresh.
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private lazy var displayLink: CADisplayLink = CADisplayLink(target: self, selector: "updateCurrentFrame")
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/// The current image frame to show.
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var currentFrame: UIImage? {
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return frameAtIndex(currentFrameIndex)
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}
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/// Returns whether the animator is animating.
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var isAnimating: Bool {
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return !displayLink.paused
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/// Is this image animatable?
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var isAnimatable: Bool {
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return imageSource.isAnimatedGIF
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}
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/// Initializes an animator instance from raw GIF image data and an `Animatable` delegate.
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///
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/// :param: data The raw GIF image data.
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/// :param: delegate An `Animatable` delegate.
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required init(data: NSData, delegate: Animatable) {
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imageSource = CGImageSourceCreateWithData(data, nil)
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self.delegate = delegate
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required init(data: NSData, size: CGSize, contentMode: UIViewContentMode) {
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let options = [String(kCGImageSourceShouldCache): kCFBooleanFalse]
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imageSource = CGImageSourceCreateWithData(data, options)
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self.size = size
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self.contentMode = contentMode
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super.init()
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attachDisplayLink()
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prepareFrames()
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pauseAnimation()
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}
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deinit {
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@ -66,12 +66,11 @@ class Animator: NSObject {
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private func prepareFrame(index: Int) -> AnimatedFrame {
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let frameDuration = CGImageSourceGIFFrameDuration(imageSource, index)
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let frameImageRef = CGImageSourceCreateImageAtIndex(imageSource, index, nil)
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let size = delegate.frame.size
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let image = UIImage(CGImage: frameImageRef)
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let scaledImage: UIImage?
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switch delegate.contentMode {
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switch contentMode {
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case .ScaleAspectFit: scaledImage = image?.resizeAspectFit(size)
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case .ScaleAspectFill: scaledImage = image?.resizeAspectFill(size)
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default: scaledImage = image?.resize(size)
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@ -91,41 +90,25 @@ class Animator: NSObject {
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/// Updates the current frame if necessary using the frame timer and the duration of each frame in `animatedFrames`.
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///
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/// :returns: An optional image at a given frame.
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func updateCurrentFrame() {
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if animatedFrames.count <= 1 { return }
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func updateCurrentFrame(duration: CFTimeInterval) -> Bool {
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if animatedFrames.count <= 1 { return false }
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timeSinceLastFrameChange += min(maxTimeStep, displayLink.duration)
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timeSinceLastFrameChange += min(maxTimeStep, duration)
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var frameDuration = animatedFrames[currentFrameIndex % animatedFrames.count].duration
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if timeSinceLastFrameChange >= frameDuration {
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timeSinceLastFrameChange -= frameDuration
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let lastFrameIndex = currentFrameIndex
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currentFrameIndex = ++currentFrameIndex % numberOfFrames
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delegate.layer.setNeedsDisplay()
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// load the next needed frame for progressive loading
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if animatedFrames.count < numberOfFrames {
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let nextFrameToLoad = (lastFrameIndex + animatedFrames.count) % numberOfFrames
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animatedFrames[lastFrameIndex % animatedFrames.count] = prepareFrame(nextFrameToLoad)
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}
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return true
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}
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}
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// MARK: - Animation
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/// Pauses the display link.
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func pauseAnimation() {
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displayLink.paused = true
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}
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/// Resumes the display link.
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func resumeAnimation() {
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if animatedFrames.count > 1 {
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displayLink.paused = false
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}
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}
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/// Attaches the dsiplay link.
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func attachDisplayLink() {
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displayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)
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return false
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}
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}
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