swift - 用 FirebaseStorage 关闭(UIImage→URL)

Question

我正在使用 Firebase Auth/Storage/Firestore 创建一个新的注册过程。

这里是新注册的过程(先用Auth认证，在Firestore中注册返回的User，有图片就保存URL)过程。

static func signUp(name: String, email: String, password: String, image: UIImage?, onSuccess: @escaping () -> Void, onError: @escaping (_ errorMessage: String?) -> Void) {
    Auth.auth().createUser(withEmail: email, password: password, completion: { user, error in
        if error != nil {
            onError(error)
            return
        }
        guard let uid = user?.user.uid else { return }
        var dict: [String: Any] = [
            "name": name,
            "email": email
        ]
        // If Image is Set
        if let image = image {
            StorageService.storage(image: image, path: .icon, id: uid) { (imageUrl) in
                dict["iconUrl"] = imageUrl
            }
        }
        Firestore.firestore().collection("users").document(uid).setData(dict) { (error) in
            if let error = error {
                print(error)
                return
            }
        }
        onSuccess()
    })
}

下面是一个以Storage UIImage为参数返回URL的函数类存储服务{

// Upload Image to Storage
static func storage(image: UIImage?, path: PathType, id: String, completion: @escaping (_ imageUrl: String?) -> ()) {
    guard let image = image, let imageData = UIImageJPEGRepresentation(image, 0.1) else {
        print("Non Image")
        completion(nil)
        return
    }
    let storageRef = Storage.storage().reference().child(path.rawValue).child(id)
    storageRef.putData(imageData, metadata: nil, completion: { (metaData, error) in
        if let error = error {
            print("Fail to Put Data in Storage : \(error)")
            completion(nil)
            return
        }
        storageRef.downloadURL { (imageUrl, error) in
            if let error = error {
                print("Fail to Download Url : \(error)")
                completion(nil)
                return
            }
            if let imageUrl = imageUrl?.absoluteString {
                completion(imageUrl)
            }
        }
    })
}

注册Auth并保存到FireStore是成功的，但是当有图片的时候，尽管它存储在 Storage 中，但图像的 URL 并未保存在 Firestore 中。

storage()闭包怎么写有问题吗

Answer 1

StorageService.storage 函数是异步的，当有图像时，在没有收到 URL 响应的情况下执行插入到 firestore 的函数。您必须将要插入的函数放在 StorageService.storage 的闭包中，以获取和保存图像的 URL

// If Image is Set
    if let image = image {
      StorageService.storage(image: image, path: .icon, id: uid) { (imageUrl) in
          dict["iconUrl"] = imageUrl
          Firestore.firestore().collection("users").document(uid).setData(dict) { (error) in
              if let error = error {
                  print(error)
                  return
              }
              onSuccess()
          }
      }
    }else {
      Firestore.firestore().collection("users").document(uid).setData(dict) { (error) in
          if let error = error {
              print(error)
              return
          }
          onSuccess()
      }
    }