防止切换开关打开并在Swiftui中显示警报

@State private var isSwitchOn = false
@State private var showAlert = false

Toggle("切换开关", isOn: $isSwitchOn)

.alert(isPresented: $showAlert) {
    Alert(title: Text("警报"), message: Text("切换开关已打开"), dismissButton: .default(Text("确定")))
}

.onChange(of: isSwitchOn) { newValue in
    if newValue {
        showAlert = true
    }
}

import SwiftUI

struct ContentView: View {
    @State private var isSwitchOn = false
    @State private var showAlert = false
    
    var body: some View {
        VStack {
            Toggle("切换开关", isOn: $isSwitchOn)
        }
        .alert(isPresented: $showAlert) {
            Alert(title: Text("警报"), message: Text("切换开关已打开"), dismissButton: .default(Text("确定")))
        }
        .onChange(of: isSwitchOn) { newValue in
            if newValue {
                showAlert = true
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}