Firebase 检查用户是否已经存在

Question

我尝试了运行以下方法，但它不起作用。如果用户已经使用了电子邮件，我检查 Firebase 服务器有什么错？

           FIRAuth.auth()!.createUser(withEmail: self.userEmailTextField.text!, password: self.userPasswordTextField.text!) {(createUser, error) in
        if error != nil { 
            FIRAuth.auth()!.signIn(withEmail: self.userEmailTextField.text!, password: self.userPasswordTextField.text!)

            //Display logged in

            let viewController = self.storyboard!.instantiateViewController(withIdentifier: "TabBarController") as UIViewController
            self.present(viewController, animated: true, completion: nil)

        }else {
            //Display an alert message
            self.displayMyAlertMessage(userMessage: "Email already in use. Please see the login page.")
            return
        }
    }

Answer 1

Firebase 已经为您完成了这项工作。擦除登录方法，仅运行使用已存在的电子邮件创建用户方法，将返回 FIRAuthErrorCodeEmailAlreadyInUse。查看 this 了解更多信息

Answer 2

请参考以下代码。

代码：

FIRAuth.auth()?.createUser(withEmail: email, password: password) {
  (user, error) in
  if (error) {
    // Email is already in use.
  } else {
    // Create new user successfully
  }
}

Handle Firebase iOS Auth Errors

Firebase 检查用户是否已经存在

Firebase Check if user already exists

ios

firebase

swift

firebase-authentication