Kingfisher 更新 KFImage url 不会更新 SwiftUI 中的图像

如何解决Kingfisher 更新 KFImage url 不会更新 SwiftUI 中的图像

抱歉初学者的问题，我正在尝试从 UIKit 过渡到 SwiftUI。 @State 变量的 didSet 不会像在 UIKit 中那样被触发。

我有从用户的 photoUrl 加载图像的 KFImage，我想要它在点击时启动图像选择器，然后更新 userUIImage 但由于 KFImage 需要一个 url 来更新，我不知道我该怎么做调用我的 updateUserImage() 更新 photoUrl 以更新 KFImage。

下面是我的代码

struct ProfileView: View {
    
    //MARK: Properties
    let screenWidth = UIScreen.main.bounds.width
    let screenHeight = UIScreen.main.bounds.height
    
    @State private var isImageLoaded: Bool = false
    @State private var showImagePicker = false
    @State private var photoUrl: URL? = URL(string: (Customer.current?.photoUrl)!)
    @State private var userImage: Image? = Image(uiImage: UIImage())
    @State private var userUIImage: UIImage? = UIImage() {
        didSet {
            if isImageLoaded {
                updateUserImage()
            }
        }
    }
    
    var body: some View {
        KFImage(photoUrl)
            .resizable()
            .onSuccess { result in
                self.userUIImage = result.image
                self.isImageLoaded = true
            }
            .aspectRatio(contentMode: .fill)
            .frame(width: screenWidth / 2.5)
            .clipShape(Circle())
            .overlay(Circle().stroke(Color.white,linewidth: 4))
            .shadow(radius: 10)
            .onTapGesture { self.showImagePicker = true }
            .sheet(isPresented: $showImagePicker) {
                CustomImagePickerView(sourceType: .photoLibrary,image: $userImage,uiImage: $userUIImage,isPresented: $showImagePicker)
            }
    }
    
    //MARK: Methods
    func updateUserImage() {
        CustomerService.updateUserImage(image: userUIImage!) { (photoUrl,error) in
            if let error = error {
                handleError(errorBody: error)
                return
            }
            guard var user = Customer.current else { return }
            self.photoUrl = photoUrl
            user.photoUrl = photoUrl?.absoluteString
            CustomerService.updateUserDatabase(user: user) { (error) in
                if let error = error {
                    handleError(errorBody: error)
                    return
                }
                Customer.setCurrent(user,writetoUserDefaults: true)
            }
        }
    }
}

解决方法

尝试改用 onChange / onReceive：

KFImage(photoUrl)
    .resizable()
    // ...
    // remove .onSuccess implementation as self.userUIImage = result.image will result in an infinite loop
    .onChange(of: userUIImage) { newImage in
        updateUserImage()
    }

或

import Combine
...
KFImage(photoUrl)
    .resizable()
    // ...
    .onReceive(Just(userUIImage)) { newImage in
        updateUserImage()
    }