how to display an error message if email and password is not valid in firebase swift?

Question

Try to develop login page in swift then I want to validate certain condition for error return.

from print(Error.localizeDescription) I get some return like

The password is invalid or the user does not have a password.
There is no user record corresponding to this identifier.

How to validate that condition based on Error.localizeDescription ?

Auth.auth().signIn(withEmail: email, password: pass, completion: {[weak self] result, Error in
            guard let StrongSelf = self else{
                return
            }
            
            if let Error = Error {
                print(Error.localizedDescription)
            }
            
            guard Error == nil else{
                // in here there is validation of return error (e.g. wrong password, account not exist)
                self?.reasonLabel.isHidden=false
                self?.reasonLabel.text=Error
                return
            }
            
            self!.checkinfo()
            
            
        })

Hey lauwis. Any update here? 👆

Frank van Puffelen
– Frank van Puffelen

2021-10-02 00:59:23 +00:00
Commented Oct 2, 2021 at 0:59 — Frank van Puffelen
– Frank van Puffelen, Commented Oct 2, 2021 at 0:59

matsotaa · Accepted Answer · 2021-09-19 13:27:45Z

1

First of all you should not to declare any property capitalized, instead use lowercased or camel if need so. second if you using [weak self] and make guard let condition then use strong one to prevent retain cycle and try to do not use force unwrap.

    Auth.auth().signIn(withEmail: email, password: pass, completion: {[weak self] result, error in
        guard let self = self else { return }

        if let error = error {
            print(error.localizedDescription)
            let alert = UIAlertController.configureAlertController(error.localizedDescription)
            self.present(alert, animated: true)
            return
        }
        // your logic

       /* or 
        if let error = error {
            print(error.localizedDescription)
            UIAlertController. showAlert(error.localizedDescription)
        }else{
         // your logic
        }
       */

       /* or
       
       guard let result = result else {
       UIAlertController. showAlert(error?.localizedDescription ?? "unknown error")
       return
       }

       // your logic
       */

       /* 
        or some else, but avoid force unwrap
       */
    })

Notice that your if let statement with error check won't prevent execution of your whole code and self!.checkinfo() will be performed, return in the end of if let error.. will tell your method that he needs to stop

 extension UIAlertController {
     static func configureAlertController(with title: String = "Attention", message: String) -> (UIAlertController){
         let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
         let action = UIAlertAction(title: "ОК",  style: .default) {(action) in}
         alertController.addAction(action)
    
         return alertController
     }
 }

answered Sep 19, 2021 at 13:27

matsotaa

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3 Comments

lauwis premium Over a year ago

is there any reason why there is a popup about UIAlertController has no member configureAlertController

matsotaa Over a year ago

not sure what do you mean, make an extension for UIAlertController and create your custom method and call it configureAlertController - it would be ur member. If you don't need UIAlertController, but need to self.reasonLabel.isHidden = false self.reasonLabel.text = error.localizedDescription make it instead of alert

matsotaa Over a year ago

@lauwispremium any way this part of your code don't trigger compile error? self?.reasonLabel.text=Error it should be kinda self?.reasonLabel.text=Error.localizedDescription - it's a String

Frank van Puffelen · Accepted Answer · 2021-09-19 14:26:22Z

0

If you want to take a specific action based on the error that Firebase Authentication raises, parsing the Error.localizeDescription is not the best way to do that. Instead check the error code of the NSError object you get in the completion handler again the values shown in the documentation on handling errors.

For example (based on this repo:

switch error {
  case let .some(error as NSError)
    where UInt(error.code) == FUIAuthErrorCode.userCancelledSignIn.rawValue:
    print("User cancelled sign-in")
  case .none:
    if let user = authDataResult?.user {
      signed(in: user)
    }
  }
}

answered Sep 19, 2021 at 14:26

Frank van Puffelen

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