如何关闭弹出错误消息

Question

我正在创建一个应用程序，当用户将文本字段留空或不会使两个密码匹配时，将显示错误警报。

问题是当信息正确并且两个密码匹配时，错误警报仍在呈现。

的代码可以看到下面：

//creating an action that will check when the sign up button is selected. 

@IBAction func registerButtonTapped(_ sender: Any) { 

    let userEmail = userEmailTextField.text; 
    let userPassword = userPasswordTextField.text; 
    let userRepeatPassword = repeatPasswordTextField.text; 

    // if one of the fields is empty the user must repeat the password 
    if ((userEmail?.isEmpty)! || (userPassword?.isEmpty)! || (userRepeatPassword != nil)) { 

     //this is the alert pop up shown to the user. 
     let alertController = UIAlertController(
      title: "Error!!!!!!", 
      message: "Something Went Wrong, Try Again", 
      preferredStyle: UIAlertControllerStyle.alert 
     ) 

     let cancelAction = UIAlertAction(
      title: "Cancel", 
      style: UIAlertActionStyle.destructive) { (action) in 

     } 

     let confirmAction = UIAlertAction(
     title: "OK", style: UIAlertActionStyle.default) { (action) in 

     } 

     alertController.addAction(confirmAction) 
     alertController.addAction(cancelAction) 

     self.present(alertController, animated: true){() -> Void in 
      return; 
     } 
    } 

func registerButtonTapped(_ sender: Any) { 

    //check if password and repeat password are the same 
    if (userPassword != userRepeatPassword) { 

     //display an alert message, user will not be able to continue // not too sure if this works 
     let alertController = UIAlertController(
      title: "Error!!!!!!", 
      message: "Something Went Wrong Try Again", 
      preferredStyle: UIAlertControllerStyle.alert 
     ) 

     let cancelAction = UIAlertAction(
      title: "Cancel", 
      style: UIAlertActionStyle.destructive) { (action) in 

     } 

     let confirmAction = UIAlertAction(
      title: "OK", 
      style: UIAlertActionStyle.default) { (action) in 

     } 

     alertController.addAction(confirmAction) 
     alertController.addAction(cancelAction) 

     self.present(alertController, animated: true){() -> Void in 
      return; 
     } 

当正确的信息已经输入的用户应该能够看到一个确认，说明已创建的帐户。

//display prompt message (confirmation) 

//this will show a message to the user showing that the registration has been successful this is not working 
func showAlert() { 
    let alertController = UIAlertController(title: "Thank You", message: "Registration Has Been Completed. Thank You", preferredStyle: .alert)  

    let defaultAction = UIAlertAction(title: "OK", style: .default, handler: nil) 

    alertController.addAction(defaultAction) 

    self.present(alertController, animated: true){() -> Void in 
     return; 
    } 
} 

这也没有显示出来。

Answer 1

我写了关于如何解决这个问题的全部内容。您可以从这里参考

@IBOutlet var userNameField: UITextField! 
@IBOutlet var passwordfield: UITextField! 
@IBOutlet var confirmPasswordField: UITextField! 

@IBAction func registerButtonTapped() { 

    if userNameField.text == "" && passwordfield.text == "" && confirmPasswordField.text == "" { 
     alertController(title: "Error", message: "One or more fields are missing", cancelTitle: "Try again!") 
    } else { 

     if passwordfield.text != confirmPasswordField.text { 
      alertController(title: "Error", message: "Your passwords do not match", cancelTitle: "Try again!") 
     } else { 
      //switch views, or do whatever you want when the user correctly enters in their information 
     } 
    } 

} 

func alertController(title: String, message: String, cancelTitle: String) { 


    let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert) 
    let cancelAction = UIAlertAction(title: cancelTitle, style: .cancel) 

    alertController.addAction(cancelAction) 
    self.present(alertController, animated: true, completion: nil) 
}