将图像上传到firebase存储仅覆盖SwiftUI/Swift 5中的当前照片？

import SwiftUI
import FirebaseStorage

struct ContentView: View {
    @State private var image: Image?
    @State private var showImagePicker = false
    
    var body: some View {
        VStack {
            if let image = image {
                image
                    .resizable()
                    .aspectRatio(contentMode: .fit)
                    .frame(width: 200, height: 200)
            } else {
                Text("No Image Selected")
            }
            
            Button(action: {
                self.showImagePicker = true
            }) {
                Text("Select Image")
            }
        }
        .sheet(isPresented: $showImagePicker) {
            ImagePicker(image: self.$image)
        }
        .onDisappear {
            if let image = self.image {
                uploadImage(image)
            }
        }
    }
    
    func uploadImage(_ image: Image) {
        guard let imageData = image.asUIImage().jpegData(compressionQuality: 0.8) else {
            return
        }
        
        let storage = Storage.storage()
        let storageRef = storage.reference()
        let imageRef = storageRef.child("images/current.jpg")
        
        let metadata = StorageMetadata()
        metadata.cacheControl = "no-store"
        
        let uploadTask = imageRef.putData(imageData, metadata: metadata)
        
        uploadTask.observe(.progress) { snapshot in
            guard let progress = snapshot.progress else {
                return
            }
            
            // Update progress UI if needed
            print("Upload progress: \(progress.fractionCompleted)")
        }
        
        uploadTask.observe(.success) { snapshot in
            // Image uploaded successfully
            print("Image uploaded")
        }
        
        uploadTask.observe(.failure) { snapshot in
            // Handle upload failure
            if let error = snapshot.error {
                print("Upload failed: \(error.localizedDescription)")
            }
        }
    }
}

struct ImagePicker: UIViewControllerRepresentable {
    @Environment(\.presentationMode) var presentationMode
    @Binding var image: Image?
    
    func makeUIViewController(context: Context) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        return picker
    }
    
    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 uiImage = info[.originalImage] as? UIImage {
                parent.image = Image(uiImage: uiImage)
            }
            
            parent.presentationMode.wrappedValue.dismiss()
        }
    }
}

extension Image {
    func asUIImage() -> UIImage {
        let controller = UIHostingController(rootView: self)
        let view = controller.view
        
        let renderer = UIGraphicsImageRenderer(size: view.bounds.size)
        let image = renderer.image { _ in
            view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
        }
        
        return image
    }
}