在 SwiftUI 中动态更改导航标题？

Question

在 SwiftUI 中不能有动态导航标题吗？随着计时器的流逝，下面的代码不会更新标题。有什么办法吗？（这是在 WatchOS 中）

（为更可测试的示例编辑了代码）

import SwiftUI

struct TimerTestView: View {
    
    @State private var timeRemaining = 100
    let timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
    
    
    var body: some View {
        Text("\(timeRemaining)")
            .onReceive(timer) { time in
                if self.timeRemaining > 0 {
                    self.timeRemaining -= 1
                }
            }
            .navigationTitle("\(timeRemaining)")
    }
}

struct TimerTestView_Previews: PreviewProvider {
    static var previews: some View {
        TimerTestView()
    }
}

Answer 1

只需打包到 NavigationView 即可解决问题 (Xcode 12.1 / watchOS 7.0)

var body: some View {
    NavigationView {
        Text("\(timeRemaining)")
                .onReceive(timer) { time in
                     if self.timeRemaining > 0 {
                          self.timeRemaining -= 1
                     }
                }
            .navigationTitle("\(timeRemaining)")
    }
}

在 SwiftUI 中动态更改导航标题？

Dynamically change Navigation Title in SwiftUI?

ios

swiftui

apple-watch

ios-navigationview