我正在嘗試使我的 SwiftUI 視圖更加“可預覽”，因此我將它們在其 Store (ViewModel) 上通用化，以便我可以更輕松地模擬它們。
考慮以下示例：
public protocol HomeViewStore: ObservableObject {
associatedtype AnimatableImageStoreType = AnimatableImageStore
var title: String { get }
var animatableImageStores: [AnimatableImageStoreType] { get }
var buttonTapSubject: PassthroughSubject<Void, Never> { get }
var retryTapSubject: PassthroughSubject<Void, Never> { get }
}
public protocol AnimatableImageStore: ObservableObject, Identifiable {
var imageConvertible: Data? { get }
var onAppear: PassthroughSubject<Void, Never> { get }
}
struct AnimatableImage<
AnimatableImageStoreType: AnimatableImageStore
>: View {
@ObservedObject private var store: AnimatableImageStoreType
public init(store: AnimatableImageStoreType) {
self.store = store
}
...
}
public struct HomeView<
HomeViewStoreType: HomeViewStore
>: View {
@StateObject private var store: HomeViewStoreType
public init(store: HomeViewStoreType) {
self._store = StateObject(wrappedValue: store)
}
public var body: some View {
VStack {
Text(store.title)
Button {
store.buttonTapSubject.send(())
} label: {
Text("API Call")
}
.background(Color(.accent))
.padding()
Button {
store.retryTapSubject.send(())
} label: {
Text("Retry")
.font(.monserrat(.bold, 14))
}
.padding()
List(store.animatableImageStores) { animatableImageStore in
AnimatableImage(store: animatableImageStore)
}
}
.background(Color(.accent))
}
}
該代碼給了我以下錯誤訊息：
我的問題是，為什么 HomeViewStoreType.AnimatableImageStoreType 不符合 AnimatableImageStore 協議，而在 HomeViewStore 協議中我將其限制為 AnimatableImageStore 協議，而 Identifiable 哪個 AnimatableImageStore 符合？
如果有人能告訴我實作這一目標的正確方法，將不勝感激:)
uj5u.com熱心網友回復：
此行不限AnimatableImageStoreType于AnimatableImageStore：
associatedtype AnimatableImageStoreType = AnimatableImageStore
替換=為:，它將起作用：
associatedtype AnimatableImageStoreType: AnimatableImageStore
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