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108 lines
2.5 KiB
Swift
108 lines
2.5 KiB
Swift
//
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// Demo
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// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
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import Combine
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import SwiftUI
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// MARK: - NetworkImageView
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struct NetworkImageView: View {
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// MARK: Internal
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init(url: URL?) {
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self.imageDownloader = .init(url: url)
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}
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// MARK: View
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var body: some View {
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if let image = self.imageDownloader.image {
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Image(uiImage: image)
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.resizable()
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.aspectRatio(contentMode: .fit)
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}
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else {
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Circle()
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.colorMultiply(Color(UIColor.placeholderText))
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.onAppear {
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self.imageDownloader.fetchImage()
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}
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}
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}
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// MARK: Private
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@ObservedObject
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private var imageDownloader: ImageDownloader
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// MARK: - NetworkImageView.ImageDownloader
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fileprivate final class ImageDownloader: ObservableObject {
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// MARK: FilePrivate
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private(set) var image: UIImage?
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let url: URL?
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init(url: URL?) {
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self.url = url
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guard let url = url else {
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return
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}
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if let image = Self.cache[url] {
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self.image = image
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}
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}
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func fetchImage() {
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guard let url = url else {
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return
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}
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if let image = Self.cache[url] {
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self.objectWillChange.send()
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self.image = image
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return
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}
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self.cancellable = URLSession.shared
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.dataTaskPublisher(for: url)
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.receive(on: DispatchQueue.main)
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.sink(
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receiveCompletion: { _ in },
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receiveValue: { output in
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if let image = UIImage(data: output.data) {
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Self.cache[url] = image
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self.objectWillChange.send()
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self.image = image
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}
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}
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)
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}
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// MARK: Private
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private static var cache: [URL: UIImage] = [:]
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private var cancellable: AnyCancellable?
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}
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}
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