如何让 Firebase 添加新用户而不覆盖当前用户（iOS、Xcode 8）？

Question

此代码在创建新用户后不断覆盖数据库。这是我输入的代码：

func handleRegister() {
    guard let email = emailTextField.text, let password = passwordTextField.text, let name = nameTextField.text
        else {
            print("Form is not Valid")
            return
        }

    Auth.auth().createUser(withEmail: email, password: password, completion: {(user: User?, error) in
        if error != nil {
            print(Error.self)
            return
        }

        guard (user?.uid) != nil else { return }
    })

    let ref = Database.database().reference(fromURL: "//Firebase link")
    let usersReference = ref.child("Users").child("uid")
    let values = ["name": name, "email": email]

    usersReference.updateChildValues(values, withCompletionBlock: { (err, ref) in
        if err != nil {
            print(err.self)
            return
        }
        print("Successfully saved user in Firebase DB")
    })
}

我觉得我错过了一些非常简单的东西。任何帮助，将不胜感激。

Answer 1

编辑： 在你的

之后

guard (user?.uid) != nil else {
  return
}

把你剩下的代码放在它下面：

let ref = Database.database()... //your code
//put inside the completion block of create user
//the rest of your code up to the updateChildValues

并在 users

中将此 uid 用作您孩子的参数

所以它会变成：

let usersReference = ref.child("Users").child(uid)

注意 uid 没有用双引号括起来

您必须将其放在 createUser 完成块中，因为您的 user?.uid 的范围仅取决于该块。

Answer 2

每次运行时在代码中使用下面的代码，因为您提供静态“uid”，因此处理程序数据被替换，使用下面的代码添加一个具有当前用户 uid 的节点，该节点在 firebase DB 中创建帐户时分配给用户

//before viewDidLoad declare a global databaseRef as

let  databaseRef = Database.Database().reference //this will be used as base reference In all handlers 
var name : String = ""
var Uid : String = ""
var email : String = ""
var nameString : String = ""

func createUser(){
    Auth.auth().createUser(withEmail: self.EmailTextField.text!, password: self.PasswordTextField.text!) { (user, error) in

        if error == nil {
            print("You have successfully signed up")
            //Goes to the Setup page which lets the user take a photo for their profile picture and also chose a username

            self.nameString = self.nameTextField.text!

            self.AddUserDetails()

            DispatchQueue.main.async(execute: {
                let vc = self.storyboard?.instantiateViewController(withIdentifier: "Main")
                self.present(vc!, animated: true, completion: nil)
            })

        } else {
                 //this block shows error if exist
                 let alertController = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: .alert)

            let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
            alertController.addAction(defaultAction)

            self.present(alertController, animated: true, completion: nil)
            //this is my activity indicator
            self.spinnerView.isHidden = true
            self.spinner.isHidden = true
            self.spinner.stopAnimating()
        }
    }
}

func AddUserDetails(){
    //I make use of user nsobject class to get all details
    //you can also make use of some global strings
    self.name = self.nameString //name string store current display name
    //name string contains name which I am taking as input when a user want to sign up as a textField text
    self.email = (Auth.auth().currentUser?.email)! //current email
    self.Uid = (Auth.auth().currentUser?.uid)! //current uid


    let user:[String : AnyObject] = ["email": self.email as AnyObject,"name":self.name as AnyObject,"uID":self.Uid as AnyObject]

    databaseRef.child("users").child(self.Uid).setValue(user)

}

Answer 3

您没有调用您的代码在用户创建回调中写入数据库。因此它使用旧的 uid 创建用户引用，从而覆盖这些值。

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

        if error != nil {
        print(Error.self)

        return
    }
// after this you are sure user created and now move your calls here 
//to write in firebase database.
    guard (user?.uid) != nil else {
        return
    }
})