54 lines
1.2 KiB
Swift
54 lines
1.2 KiB
Swift
//
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// LayerImageProvider.swift
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// lottie-swift
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//
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// Created by Brandon Withrow on 1/25/19.
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//
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import Foundation
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/// Connects a LottieImageProvider to a group of image layers
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final class LayerImageProvider {
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// MARK: Lifecycle
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init(imageProvider: AnimationImageProvider, assets: [String: ImageAsset]?) {
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self.imageProvider = imageProvider
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imageLayers = [ImageCompositionLayer]()
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if let assets = assets {
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imageAssets = assets
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} else {
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imageAssets = [:]
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}
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reloadImages()
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}
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// MARK: Internal
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private(set) var imageLayers: [ImageCompositionLayer]
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let imageAssets: [String: ImageAsset]
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var imageProvider: AnimationImageProvider {
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didSet {
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reloadImages()
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}
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}
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func addImageLayers(_ layers: [ImageCompositionLayer]) {
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for layer in layers {
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if imageAssets[layer.imageReferenceID] != nil {
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/// Found a linking asset in our asset library. Add layer
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imageLayers.append(layer)
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}
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}
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}
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func reloadImages() {
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for imageLayer in imageLayers {
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if let asset = imageAssets[imageLayer.imageReferenceID] {
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imageLayer.image = imageProvider.imageForAsset(asset: asset)
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}
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}
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}
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}
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