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Pods/Kingfisher/Sources/SwiftUI/KFImageRenderer.swift

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+//
+//  KFImageRenderer.swift
+//  Kingfisher
+//
+//  Created by onevcat on 2021/05/08.
+//
+//  Copyright (c) 2021 Wei Wang <onevcat@gmail.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if canImport(SwiftUI) && canImport(Combine)
+import SwiftUI
+import Combine
+
+/// A Kingfisher compatible SwiftUI `View` to load an image from a `Source`.
+/// Declaring a `KFImage` in a `View`'s body to trigger loading from the given `Source`.
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+struct KFImageRenderer<HoldingView> : View where HoldingView: KFImageHoldingView {
+    
+    @StateObject var binder: KFImage.ImageBinder = .init()
+    let context: KFImage.Context<HoldingView>
+    
+    var body: some View {
+        if context.startLoadingBeforeViewAppear && !binder.loadingOrSucceeded && !binder.animating {
+            binder.markLoading()
+            DispatchQueue.main.async { binder.start(context: context) }
+        }
+        
+        return ZStack {
+            renderedImage().opacity(binder.loaded ? 1.0 : 0.0)
+            if binder.loadedImage == nil {
+                ZStack {
+                    if let placeholder = context.placeholder {
+                        placeholder(binder.progress)
+                    } else {
+                        Color.clear
+                    }
+                }
+                .onAppear { [weak binder = self.binder] in
+                    guard let binder = binder else {
+                        return
+                    }
+                    if !binder.loadingOrSucceeded {
+                        binder.start(context: context)
+                    }
+                }
+                .onDisappear { [weak binder = self.binder] in
+                    guard let binder = binder else {
+                        return
+                    }
+                    if context.cancelOnDisappear {
+                        binder.cancel()
+                    }
+                }
+            }
+        }
+        // Workaround for https://github.com/onevcat/Kingfisher/issues/1988
+        // on iOS 16 there seems to be a bug that when in a List, the `onAppear` of the `ZStack` above in the
+        // `binder.loadedImage == nil` not get called. Adding this empty `onAppear` fixes it and the life cycle can
+        // work again.
+        //
+        // There is another "fix": adding an `else` clause and put a `Color.clear` there. But I believe this `onAppear`
+        // should work better.
+        //
+        // It should be a bug in iOS 16, I guess it is some kinds of over-optimization in list cell loading caused it.
+        .onAppear()
+    }
+    
+    @ViewBuilder
+    private func renderedImage() -> some View {
+        let configuredImage = context.configurations
+            .reduce(HoldingView.created(from: binder.loadedImage, context: context)) {
+                current, config in config(current)
+            }
+        if let contentConfiguration = context.contentConfiguration {
+            contentConfiguration(configuredImage)
+        } else {
+            configuredImage
+        }
+    }
+}
+
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension Image {
+    // Creates an Image with either UIImage or NSImage.
+    init(crossPlatformImage: KFCrossPlatformImage?) {
+        #if canImport(UIKit)
+        self.init(uiImage: crossPlatformImage ?? KFCrossPlatformImage())
+        #elseif canImport(AppKit)
+        self.init(nsImage: crossPlatformImage ?? KFCrossPlatformImage())
+        #endif
+    }
+}
+
+#if canImport(UIKit)
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension UIImage.Orientation {
+    func toSwiftUI() -> Image.Orientation {
+        switch self {
+        case .down: return .down
+        case .up: return .up
+        case .left: return .left
+        case .right: return .right
+        case .upMirrored: return .upMirrored
+        case .downMirrored: return .downMirrored
+        case .leftMirrored: return .leftMirrored
+        case .rightMirrored: return .rightMirrored
+        @unknown default: return .up
+        }
+    }
+}
+#endif
+#endif