在未执行使用 firebase 创建新用户后进行 Segue -Swift答案

【问题标题】：Segue after new user creation using firebase not being performed -Swift在未执行使用 firebase 创建新用户后进行 Segue -Swift
【发布时间】：2017-08-26 23:22:26
【问题描述】：

但是，我遇到了两个 segues 的问题，因为我在实现每个 segues 时使用了相同的逻辑，所以我将继续将所有内容浓缩为一个问题。基本上，我正在尝试在使用 firebase 执行 createUser 函数并执行同样由 Firebase 处理的 login 函数之后初始化一个 segue，但是，当单击 SignUp 和 Login 按钮时，似乎没有响应被调用的segue。下面是每个@IBActions的代码

 @IBAction func signUpComplete(_ sender: Any) {
    FIRAuth.auth()?.createUser(withEmail: signUpEmailField.text!, password: signUpPasswordField.text!, completion: { (user: FIRUser?, error) in
        if self.signUpEmailField.text == "" || self.signUpPasswordField.text == "" {
                let alert = UIAlertController(title: "Oops!", message: "A valid E-mail and Password are Required", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
                    self.present(alert, animated: true, completion: nil)



        if FIRAuthErrorCode.errorCodeEmailAlreadyInUse != nil {

            let emailExists = UIAlertController(title: "Oops!", message: "A user with this E-Mail already exists!", preferredStyle: UIAlertControllerStyle.alert)
            emailExists.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
            self.present(emailExists, animated: true, completion: nil)


            }

        else {

            DispatchQueue.main.async () {
                self.performSegue(withIdentifier: "signUpSucceededSegue", sender: self)
            }
            }

            }
        })
}

和

@IBAction func loginButton(_ sender: Any) {

    FIRAuth.auth()?.signIn(withEmail: emailLoginField.text!, password: passwordLoginField.text!, completion: { (user: FIRUser?, error) in
            if self.emailLoginField.text == "" || self.passwordLoginField.text == ""{

                let alert = UIAlertController(title: "Alert", message: "E-Mail is Required", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
                self.present(alert, animated: true, completion: nil)

            if FIRAuthErrorCode.errorCodeUserNotFound != nil {

                let invalidLogin = UIAlertController(title: "Alert", message: "E-Mail/Password Incorrect", preferredStyle: UIAlertControllerStyle.alert)
                invalidLogin.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
                self.present(invalidLogin, animated: true, completion: nil)

            }

        else{


                DispatchQueue.main.async () {

                    self.performSegue(withIdentifier: "loginSucceededSegue", sender: self)

                }

            }


        }
    })

乍一看是否有任何明显的逻辑错误，或者有没有更好的方法来实现这些函数的 segue？

【问题讨论】：

标签： ios iphone swift firebase firebase-authentication

【解决方案1】：

将导航控制器嵌入故事板的第一个视图

然后尝试使用此代码：-

@IBAction func signUpComplete(_ sender: Any) {


if self.signUpEmailField.text == "" || self.signUpPasswordField.text == "" {

    let alert = UIAlertController(title: "Oops!", message: "A valid E-mail and Password are Required", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
    self.present(alert, animated: true, completion: nil)

}else{

    FIRAuth.auth()?.createUser(withEmail: self.signUpEmailField!.text, password: self.signUpPasswordField!.text, completion: { (user, err) in

        if let ErrorCode = FIRAuthErrorCode(rawValue: err!._code){

            switch ErrorCode {

            case .errorCodeEmailAlreadyInUse : let emailExists = UIAlertController(title: "Oops!", message: "A user with this E-Mail already exists!", preferredStyle: UIAlertControllerStyle.alert)
                                               emailExists.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
                                               self.present(emailExists, animated: true, completion: nil)

                                               break

            default                      :  break 

            }

        }else{

            let nextView = self.navigationController!.storyboard!.instantiateViewController(withIdentifier: "signUpSucceededSegue")
            self.navigationController!.pushViewController(nextView, animated: true)

        }
    })
  }
}

然后以类似的方式更改您的其他代码块。

【讨论】：