如何使用UIHostingController/SwiftUI创建一个关闭视图的按钮？

import SwiftUI

struct ContentView: View {
    @Environment(\.presentationMode) var presentationMode
    
    var body: some View {
        VStack {
            Text("Hello, World!")
            Button(action: {
                self.presentationMode.wrappedValue.dismiss()
            }) {
                Text("关闭视图")
            }
        }
    }
}

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

import UIKit
import SwiftUI

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let contentView = ContentView()
        let hostingController = UIHostingController(rootView: contentView)
        
        addChild(hostingController)
        view.addSubview(hostingController.view)
        
        hostingController.view.translatesAutoresizingMaskIntoConstraints = false
        hostingController.view.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        hostingController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        hostingController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        hostingController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        
        hostingController.didMove(toParent: self)
    }
}