30 lines
954 B
Swift
30 lines
954 B
Swift
/// Represents a single frame in a GIF.
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struct AnimatedFrame {
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/// The image to display for this frame. Its value is nil when the frame is removed from the buffer.
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let image: UIImage?
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/// The duration that this frame should remain active.
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let duration: TimeInterval
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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 this frame 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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/// Returns a new instance from an ptional image.
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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: An `AnimatedFrame` instance.
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func makeAnimatedFrame(with newImage: UIImage?) -> AnimatedFrame {
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return AnimatedFrame(image: newImage, duration: duration)
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}
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}
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