我们如何将数据写入firebase实时数据库？即使启用了读/写，但似乎不起作用

Question

我创建了一个注册页面，其中包含用户的电子邮件、用户名、全名、密码和头像。问题是firebase身份验证工作完美，而且我成功地将个人资料图片上传到firebase存储。我似乎无法将全名和用户名等其他属性写入firebase实时数据库（不是firestore）。

读写已经设置为true： 身份验证成功 图像存储成功 数据写入实时数据库不工作

没有错误被抛出。只是没有数据被写入 使用 xcode 10.2.1

@objc func handleSignUp() {

        // properties
        guard let email = emailTextField.text else { return }
        guard let password = passwordTextField.text else { return }
        guard let fullName = fullNameTextField.text else { return }
        guard let username = usernameTextField.text?.lowercased() else { return }

        Auth.auth().createUser(withEmail: email, password: password) { (user, error) in

            // handle error
            if let error = error {
                print("Failed to create user with error: ", error.localizedDescription)
                return
            }

            // set profile image
            guard let profileImg = self.plusPhotoBtn.imageView?.image else { return }

            // upload data
            guard let uploadData = profileImg.jpegData(compressionQuality: 0.3) else { return }

            // place image in firebase storage
            let filename = NSUUID().uuidString
            Storage.storage().reference().child("profile_images").child(filename).putData(uploadData)
            Storage.storage().reference().child("profile_images/\(filename).jpg").downloadURL(completion: { (url, error) in
                guard let profileImageUrl = url?.absoluteString else {return}
                guard let uid = Auth.auth().currentUser?.uid else {return}
                let dictionaryValues = ["name": fullName,
                                        "username": username,
                                        "profileImageUrl": profileImageUrl]
                let values = [uid: dictionaryValues]
                Database.database().reference().child("users").updateChildValues(values, withCompletionBlock: { (error, ref) in

                    guard let mainTabVC = UIApplication.shared.keyWindow?.rootViewController as? MainTabVC else { return }

                    // configure view controllers in maintabvc
                    mainTabVC.configureViewControllers()

                    // dismiss login controller
                    self.dismiss(animated: true, completion: nil)
                })

            })
        }
    }

Answer 1

您在代码中执行的顺序是问题的一部分。您应该真正使用 putData 之后的闭包来处理您放置的数据。

此外，当您创建用户时，闭包将包含一个用户变量，您可以从中获取 uid。所以不要这样做guard let uid = Auth.auth().currentUser?.uid，因为用户变量保证是有效的。

这是一个可以使用的通用模板

Auth.auth().createUser(withEmail: email, password: password) { (user, error) in

   // handle error
   if let error = error {
      print("Failed to create user with error: ", error.localizedDescription)
      return
   }
   .
   .
   .

   // Upload the file to the path "images/rivers.jpg"
   let ref = storageRef.putData(data, metadata: nil) { (metadata, error) in
       guard let metadata = metadata else {
           print("error while uploading")
           return
       }
       // Metadata contains file metadata such as size, content-type.
       let size = metadata.size
       storageRef.downloadURL { (url, error) in
           guard let downloadURL = url else {
               print("an error occured after uploading and then downloading")
               return
           }

           let validDownloadUrl = downloadURL.absoluteString
           let uid = user.uid
           let dictionaryValues = ["name": fullName,
                                   "username": username,
                                   "profileImageUrl": validDownloadUrl]
           //write out your firebase data with a key of uid
       }
   }
}