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/// - WARNING: Don't use it, this an example how _not_ to do it. | |
public struct ImageView: View { | |
@ObservedObject private var viewModel: FetchImage | |
private let image: (PlatformImage) -> AnyView | |
private let placeholder: () -> AnyView | |
private let error: (Error) -> AnyView | |
public init<ImageView: View, PlaceholderView: View, ErrorView: View>( | |
viewModel: FetchImage, | |
@ViewBuilder image: @escaping (PlatformImage) -> ImageView, | |
@ViewBuilder placeholder: @escaping () -> PlaceholderView, | |
@ViewBuilder error: @escaping (Error) -> ErrorView | |
) { | |
self.viewModel = viewModel | |
self.image = { AnyView(image($0)) } | |
self.error = { AnyView(error($0)) } | |
self.placeholder = { AnyView(placeholder()) } | |
} | |
public init<ImageView: View>( | |
viewModel: FetchImage, | |
@ViewBuilder image: @escaping (PlatformImage) -> ImageView | |
) { | |
self.init( | |
viewModel: viewModel, | |
image: image, | |
placeholder: { Rectangle().foregroundColor(.clear) }, | |
error: { _ in Rectangle().foregroundColor(.clear) } | |
) | |
} | |
public init(viewModel: FetchImage) { | |
self.init( | |
viewModel: viewModel, | |
image: ImageView.makeImage(with:), | |
placeholder: { Rectangle().foregroundColor(.clear) }, | |
error: { _ in Rectangle().foregroundColor(.clear) } | |
) | |
} | |
public var body: some View { | |
if let image = viewModel.image { | |
return self.image(image) | |
} else if let error = viewModel.error { | |
return AnyView(self.error(error) | |
.onAppear(perform: viewModel.fetch) | |
.onDisappear(perform: viewModel.cancel)) | |
} else { | |
return AnyView(placeholder() | |
.onAppear(perform: viewModel.fetch) | |
.onDisappear(perform: viewModel.cancel)) | |
} | |
} | |
public static func makeImage(with image: PlatformImage) -> SwiftUI.Image { | |
#if os(macOS) | |
return Image(nsImage: image) | |
#else | |
return Image(uiImage: image) | |
#endif | |
} | |
} |
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