SwiftUI中的图像选取器-如何知道用户何时在基于UIkit的ViewController主机中选择了图像

import SwiftUI
import UIKit

struct ImagePicker: UIViewControllerRepresentable {
    @Binding var selectedImage: UIImage?
    @Environment(\.presentationMode) var presentationMode

    func makeUIViewController(context: Context) -> UIImagePickerController {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = context.coordinator
        return imagePicker
    }

    func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) {}

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        let parent: ImagePicker

        init(_ parent: ImagePicker) {
            self.parent = parent
        }

        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
            if let selectedImage = info[.originalImage] as? UIImage {
                parent.selectedImage = selectedImage
            }
            parent.presentationMode.wrappedValue.dismiss()
        }
    }
}

struct ContentView: View {
    @State private var selectedImage: UIImage?

    var body: some View {
        VStack {
            if let image = selectedImage {
                Image(uiImage: image)
                    .resizable()
                    .aspectRatio(contentMode: .fit)
            } else {
                Text("No image selected")
            }

            Button("Select Image") {
                // 显示图像选取器
                // 在基于UIKit的ViewController主机中选择图像后，将更新selectedImage变量
            }
        }
        .sheet(isPresented: $isShowingImagePicker) {
            ImagePicker(selectedImage: $selectedImage)
        }
    }
}