在上一屏幕SwiftUI上显示警报

import SwiftUI

struct ContentView: View {
    @State private var showAlert = false

    var body: some View {
        Button("显示警报") {
            showAlert = true
        }
        .alert(isPresented: $showAlert) {
            Alert(
                title: Text("警报标题"),
                message: Text("警报消息"),
                primaryButton: .default(Text("确定"), action: {
                    // 点击确定按钮后的操作
                }),
                secondaryButton: .cancel()
            )
        }
    }
}