28 lines
979 B
Swift
28 lines
979 B
Swift
/// Keeps a reference to an `UIImage` instance and its duration as a GIF frame.
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struct AnimatedFrame {
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/// The image that should be used for this frame.
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let image: UIImage?
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/// The duration that the frame image should be displayed.
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let duration: NSTimeInterval
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/// A placeholder frame with no image assigned.
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/// Used to replace frames that are no longer needed in the animation.
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var placeholderFrame: AnimatedFrame {
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return AnimatedFrame(image: nil, duration: duration)
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}
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/// Whether the AnimatedFrame instance contains an image or not.
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var isPlaceholder: Bool {
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return image == .None
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}
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/// Takes an optional image and returns an non-placeholder `AnimatedFrame`.
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///
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/// - parameter image: An optional `UIImage` instance to be assigned to the new frame.
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/// - returns: A non-placeholder `AnimatedFrame` instance.
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func frameWithImage(image: UIImage?) -> AnimatedFrame {
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return AnimatedFrame(image: image, duration: duration)
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}
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}
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