【发布时间】：2021-07-10 12:35:17
【问题描述】：
我正在尝试在将图像上传到 Firebase 存储时观察进度。控制台中的进度正在更新，但是我的 ProgressView 没有更新。其他一切似乎都按预期工作。知道我做错了什么吗？
class UserManager: ObservableObject {
@Published var taskProgress: Float = 0.0
let user = Auth.auth().currentUser
func uploadProfilePicture(image: UIImage) {
let uploadRef = FirebaseReferenceManager.storage.reference(withPath: "profile/\(user!.uid)")
guard let imageData = image.jpegData(compressionQuality: 0.75) else {
return
}
let uploadMetaData = StorageMetadata.init()
uploadMetaData.contentType = "image/jpeg"
let taskReference = uploadRef.putData(imageData, metadata: uploadMetaData) { (downloadMetaData, error) in
if let error = error {
print(error.localizedDescription)
return
} else {
print("Successfully Uploaded Profile Picture to Firebase Storage")
let downloadRef = FirebaseReferenceManager.storage.reference(withPath: "profile/\(self.user!.uid)")
downloadRef.downloadURL { (url, error) in
if let error = error {
print(error.localizedDescription)
return
}
FirebaseReferenceManager.root.collection(FirebaseKeys.CollectionPath.users).document(self.user!.uid).setData([FirebaseKeys.UsersFieldPath.photoURL : url!.absoluteString], merge: true)
}
}
}
taskReference.observe(.progress) { [weak self] (snapshot) in
DispatchQueue.main.async {
guard let pctThere = snapshot.progress?.fractionCompleted else {return}
print(pctThere)
self?.taskProgress = Float(pctThere)
}
}
taskReference.resume()
}
}
在我看来，我把以下内容
@EnvironmentObject var userManager: UserManager
ProgressView(value: userManager.taskProgress).progressViewStyle(LinearProgressViewStyle())
这是类的初始化方式：
struct SwiftUIView: View {
@StateObject var userManager = UserManager()
var body: some View {
TabView {
HomeView().tabItem {
Image("home")
Text("Home")
}
SearchView().tabItem {
Image("search")
Text("Search")
}
DiscoverView().tabItem {
Image("discover")
Text("Discover")
}
OrdersView().tabItem {
Image("calendar")
Text("Orders")
}
InboxView().tabItem {
Image("inbox")
Text("Inbox")
}
}
.environmentObject(userManager)
}
}
然后我将它向下传递到层次结构中，使用
@EnvironmentObject var userManager: UserManager
这里是调用 uploadProfilePicture() 的地方：
struct ImagePicker: UIViewControllerRepresentable {
var sourceType: UIImagePickerController.SourceType = .photoLibrary
@Binding var selectedImage: UIImage
@Environment(\.presentationMode) private var presentationMode
func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
let imagePicker = UIImagePickerController()
imagePicker.delegate = context.coordinator
imagePicker.allowsEditing = true
imagePicker.sourceType = sourceType
return imagePicker
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<ImagePicker>) {
}
class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
let parent: ImagePicker
@ObservedObject private var userManager = UserManager()
init(_ parent: ImagePicker) {
self.parent = parent
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image = info[.editedImage] as? UIImage {
parent.selectedImage = image
userManager.uploadProfilePicture(image: image)
}
parent.presentationMode.wrappedValue.dismiss()
}
}
}
【问题讨论】：
-
您是否尝试过使用
@State var userManager？ -
你检查过
self是否为nil吗？ -
尝试在
userManager上的@EnvironmentObject 上使用@ObservedObject，然后设置一个实例。例如。@ObservedObject var userManager = UserManager()然后将其作为 ViewModel 引用。如果您需要它作为@Environment，请考虑将其更改为单例。 -
@Todd 我刚试了一下，没用，谢谢。
-
@George_E 是的。也许我不清楚，但我能够打印进度。例如。 onAppear { print(userManager.taskProgress) } 只是没有更新的进度视图。
标签： swift swiftui firebase-storage