Login authentication problem with firebase in Xcode

Question

I try to do firebase authenticate. I've installed all necessary pods and made all needed methods. When I click "Login" even when I entered bad email and password, I get error message (e.g. bad password) and immediately my view is changed to my target view (next ViewController). I don't know why it is happening, because I made if statement. I want to have my login page unless I enter correct email and password.

 @IBAction func loginTapped(_ sender: UIButton) {
         if let email = emailTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines), let password =
 passwordTextField.text?.trimmingCharacters(in:
 .whitespacesAndNewlines) {
             
            Auth.auth().signIn(withEmail: email, password: password) { (authResult, error) in
                if let e = error {
                     // Can't sign in
                     self.errorLabel.text = error!.localizedDescription
                     self.errorLabel.alpha = 1
                 } else {
                     self.performSegue(withIdentifier: "loginToHome", sender: self)
                }
             }
         }
     }

How you have added segue to move to next controller upon success ? — Surjeet Singh
– Surjeet Singh, Commented Feb 23, 2021 at 16:43
I have added it by mainstoryboard. I have dragged login button to new View and added segue "show" with identifier "loginToHome" — TeddyKen
– TeddyKen, Commented Feb 23, 2021 at 18:24

mjoe7 · Accepted Answer · 2021-02-23 18:46:58Z

1

You may try to check if an error exists first. If yes, the error message will be shown. If there's no error, the login success segue will be performed.

@IBAction func loginTapped(_ sender: UIButton) {
    if let email = emailTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines), let password = passwordTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) {
        Auth.auth().signIn(withEmail: email, password: password) { (authResult, error) in
          if error != nil { // there's an error - show error label
               self.errorLabel.text = error!.localizedDescription
               self.errorLabel.alpha = 1
          } else { //no error - perform segue
           // no error - perform segue
          self.performSegue(withIdentifier: "loginToHome", sender: self) } } } }

Edit: You may also add return after checking that an error exists - the codes that follow after it will not be performed:

@IBAction func loginTapped(_ sender: UIButton) {
    if let email = emailTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines), let password = passwordTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) {
        Auth.auth().signIn(withEmail: email, password: password) { (authResult, error) in
          if error != nil { // there's an error - show error label
                self.errorLabel.text = error!.localizedDescription
                self.errorLabel.alpha = 1
                return // activities that follow will not be performed
          } else { //no error - perform segue
                self.performSegue(withIdentifier: "loginToHome", sender: self) } } } }

edited Feb 23, 2021 at 18:46

answered Feb 23, 2021 at 17:24

mjoe7

1446 bronze badges

Sign up to request clarification or add additional context in comments.

10 Comments

mjoe7 Over a year ago

Have you tried this code snippet before voting down? pls explain the downvote.

TeddyKen Over a year ago

Ok, I've tried this, but it still doesn't work :(. It automatically moves to next view when I click login button

TeddyKen Over a year ago

Maybe better option will be add instantiate view?

mjoe7 Over a year ago

are you using the UIStoryboard or are you doing the views programmatically? If you are using the Storyboard, are you sure your UIButton is not connected to the next View?

mjoe7 Over a year ago

If your segue is connected via the UIButton then it must be the problem...

|

Collectives™ on Stack Overflow

Login authentication problem with firebase in Xcode

1 Answer 1

10 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

10 Comments

Your Answer

Sign up or log in

Post as a guest

Related