我有用于otp验证的textfield的alertview，但如果OTP不匹配，那么alertView将不会被解雇

Question

我有用于otp验证的textfield的alertview，但如果OTP不匹配，则另一个alertView将显示消息“OTP not matched”，然后点击ok按钮，然后再次出现以前的alertview（带OTP文本字段的alertview）进入OTP。

@IBAction func btnRegisterTapped(_ sender: UIButton) {
  if !Validate(){
    return
  }
  // get otp session
  APIController.registerUser(Email:  self.txtfldEmail.text!, Nonce: self.registerNonce) { (data1) in
    print("data1 :=> \(data1)")

    let alertController = UIAlertController(title: "BrainCal", message: "Please verify your OTP for login", preferredStyle: .alert)

    let OkAction = UIAlertAction(title: "OK", style: .default, handler: {
      alert -> Void in

      APIController.registerUserWithOtp(Email: self.txtfldEmail.text!, Password: "", Nonce: self.registerNonce, Otp: (alertController.textFields?.first?.text!)!, Otp_Session: "\(data1["otp_session"]!)", SuccessHandler: { (response) in
        print(response)
        let dict = response as NSDictionary

        if  UserDefaults.standard.value(forKey: "LoginUserData") != nil{
          UserDefaults.standard.removeObject(forKey: "LoginUserData")
        }
        UserDefaults.standard.set(NSKeyedArchiver.archivedData(withRootObject: dict), forKey: "LoginUserData")

        self.performSegue(withIdentifier: "MainSegue", sender: self)
      })
    })
    alertController.addTextField { (textField : UITextField!) -> Void in
      textField.placeholder = "Enter Otp Here"
      textField.keyboardType = .numberPad

      NotificationCenter.default.addObserver(forName: NSNotification.Name.UITextFieldTextDidChange, object: textField, queue: OperationQueue.main) { (notification) in
        OkAction.isEnabled = textField.text!.characters.count > 0
      }
    }
    OkAction.isEnabled = false
    alertController.addAction(OkAction)
    self.present(alertController, animated: true, completion: nil)
  }
}