如何在UIViewControllerRepresentable结构中创建UIBarButtonItem？

import SwiftUI
import UIKit

// Step 1: 创建UIViewControllerRepresentable结构体
struct MyViewControllerRepresentable: UIViewControllerRepresentable {
    
    func makeUIViewController(context: Context) -> MyViewController {
        let viewController = MyViewController()
        viewController.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: viewController, action: #selector(MyViewController.didTapAddButton))
        return viewController
    }
    
    func updateUIViewController(_ uiViewController: MyViewController, context: Context) {}
}

// Step 2: 创建UIViewController子类
class MyViewController: UIViewController {
    
    @objc func didTapAddButton() {
        print("Add button tapped!")
    }
}

// Step 3: 在SwiftUI视图中使用
struct ContentView: View {
    var body: some View {
        NavigationView {
            VStack {
                Text("Hello, World!")
            }
            .navigationTitle("My App")
            .background(MyViewControllerRepresentable().edgesIgnoringSafeArea(.all))
        }
    }
}

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

viewController.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: viewController, action: #selector(MyViewController.didTapAddButton))