SwiftUI .focused() View 修饰符不工作 .onAppear

Question

我正在尝试让新的 iOS 15.0 .focused() View Modifier 在 SwiftUI View 出现时执行:

import SwiftUI

struct MainView: View {
    @State var subViewIsDisplayed = false
    var body: some View {
        VStack {
            Spacer()
            Button(action: { subViewIsDisplayed.toggle() }) {
                Text("Trigger SubView")
            }
            Spacer()
        }
        .fullScreenCover(isPresented: $subViewIsDisplayed) {
            SubView()
        }
    }
}

struct SubView: View {
    @Environment(\.dismiss) var dismiss
    @FocusState private var isFocused: Bool
    @State var text = ""
    
    var body: some View {
        VStack {
            HStack {
                Spacer()
                Button(action: { dismiss() }) {
                    Image(systemName: "xmark")
                }
            }
            Spacer()
            TextField("Please autofocus :(", text: $text)
                .focused($isFocused)
            Spacer()
        }
        .onAppear {
            self.isFocused = true
        }
    }
}

struct MainView_Previews: PreviewProvider {
    static var previews: some View {
        MainView()
    }
}

在我的物理设备上，触发“SubView”不会调出键盘(正如我对 .focused 所期望的那样)。我做错了什么？

Answer 1

        .onAppear {
            DispatchQueue.main.async {
                isFocused = true
            }
        }

DispatchQueue.main.async，一如既往的成功