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//
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// asyncCachedImage.swift
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// AllIn
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//
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// Created by Lucas Delanier on 06/06/2024.
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//
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import SwiftUI
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@MainActor
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struct AsyncCachedImage<ImageView: View, PlaceholderView: View>: View {
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// Input dependencies
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var url: URL?
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@ViewBuilder var content: (Image) -> ImageView
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@ViewBuilder var placeholder: () -> PlaceholderView
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// Downloaded image
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@State var image: UIImage? = nil
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init(
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url: URL?,
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@ViewBuilder content: @escaping (Image) -> ImageView,
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@ViewBuilder placeholder: @escaping () -> PlaceholderView
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) {
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self.url = url
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self.content = content
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self.placeholder = placeholder
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}
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var body: some View {
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VStack {
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if let uiImage = image {
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content(Image(uiImage: uiImage))
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} else {
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placeholder()
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.onAppear {
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Task {
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image = await downloadPhoto()
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}
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}
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}
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}
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}
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// Downloads if the image is not cached already
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// Otherwise returns from the cache
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private func downloadPhoto() async -> UIImage? {
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do {
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guard let url else { return nil }
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// Check if the image is cached already
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if let cachedResponse = URLCache.shared.cachedResponse(for: .init(url: url)) {
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return UIImage(data: cachedResponse.data)
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} else {
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let (data, response) = try await URLSession.shared.data(from: url)
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// Save returned image data into the cache
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URLCache.shared.storeCachedResponse(.init(response: response, data: data), for: .init(url: url))
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guard let image = UIImage(data: data) else {
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return nil
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}
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return image
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}
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} catch {
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print("Error downloading: \(error)")
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return nil
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}
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}
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}
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