问SwiftUI中的ImagePicker

EN

struct ImagePicker: UIViewControllerRepresentable {
    
  @Environment(\.presentationMode) var presentationMode
  @Binding var image: UIImage?
    
    class Coordinator: NSObject, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
        let parent: ImagePicker

        init(_ parent: ImagePicker) {
            self.parent = parent
        }
        
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
            if let uiImage = info[.originalImage] as? UIImage {
                parent.image = uiImage
            }

        parent.presentationMode.wrappedValue.dismiss()
        }     
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    

    func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        return picker
    }

    func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<ImagePicker>) {
   
    }
}

import SwiftUI

struct ContentView: View {
    
    @State private var image: Image?
    @State private var showingImagePicker = false
    @State private var inputImage: UIImage?
    

    var body: some View {
     NavigationView {
             ZStack {
                 Rectangle()
                     .fill(Color.secondary)

                 if image != nil {
                     image?
                         .resizable()
                         .scaledToFit()
                 } else {
                     Text("Tap to select a picture")
                 }
             }
             .onTapGesture {
                 self.showingImagePicker = true
             }


        .sheet(isPresented: $showingImagePicker, onDismiss: loadImage) {
            ImagePicker(image: self.$inputImage)
        }
     }
    }

    func loadImage() {
        guard let inputImage = inputImage else { return }
        image = Image(uiImage: inputImage)
    }
    
}