如何在swiftui中显示if-condition语句中的警报视图？

if showAlert {
    Alert(title: Text("警报"), message: Text("这是一个警报视图"), dismissButton: .default(Text("确定")))
}

Button(action: {
    showAlert = true
}) {
    Text("显示警报")
}

import SwiftUI

struct ContentView: View {
    @State private var showAlert = false
    
    var body: some View {
        VStack {
            Button(action: {
                showAlert = true
            }) {
                Text("显示警报")
            }
            
            if showAlert {
                Alert(title: Text("警报"), message: Text("这是一个警报视图"), dismissButton: .default(Text("确定")))
            }
        }
    }
}

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