如何通过切换 Swiftui 传递函数

Question

状态变量：

@State var toggleIsOn = false

切换：

Toggle(isOn: $toggleIsOn, label: {Text("Notifications")})

我想要以下按钮，代表开关的每个状态，打开和关闭：

                // Will request to send notifications, if success; will schedule them.
                Button("request") {
                    NotificationManager.instance.requestAuthorization()
                }
                // Will clear the queue of notifications, and delete any delivered.
                Button("cancel") {
                    NotificationManager.instance.cancelNotifications()
                }

我在这个视频中找到了函数：https://www.youtube.com/watch?v=mG9BVAs8AIo

Answer 1

使用

onChange(of:)

例如：

    struct ContentView: View {
    @State var toggleIsOn: Bool = false

    var body: some View {
        Toggle(isOn: $toggleIsOn, label: {Text("Notifications")})
        .onChange(of: toggleIsOn) { isOn in
             if isOn {
                  NotificationManager.instance.requestAuthorization()
             } else {
                  NotificationManager.instance.cancelNotifications()
             }
        }
    }
}