如何在SwiftUI中显示UIAlertController？

struct AlertPresenter: ViewModifier {
    @Binding var showAlert: Bool
    var title: String
    var message: String

    func body(content: Content) -> some View {
        content
            .alert(isPresented: $showAlert) {
                Alert(title: Text(title), message: Text(message), dismissButton: .default(Text("OK")))
            }
    }
}

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

    var body: some View {
        VStack {
            Button(action: {
                showAlert = true
            }) {
                Text("显示警报")
            }
        }
        .modifier(AlertPresenter(showAlert: $showAlert, title: "警告", message: "这是一个警告示例"))
    }
}