CODEWITHSUNDEEP
swiftfirebasefirebase-authentication
lauwis premium
lauwis premium

Reputation: 45

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

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

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()
            
            
        })

Upvotes: 1

Views: 1062

Answers (2)

Frank van Puffelen
Frank van Puffelen

Reputation: 598765

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)
    }
  }
}

Upvotes: 0

matsotaa
matsotaa

Reputation: 123

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
     }
 }

Upvotes: 1

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