Ndtyjky

Using firebase to create user sign-in as follow,

a) Sign-up view -> b) Email view -> c) userName view

And have two button namely back and next, all of this can be seen below,

Problem occurs when view b has previously visited view c and upon clicking back button on view b, Firebase falsely goes into user auth function (checked using breakpoints),

Supporting code for back button,

(IBAction)backButtonPressed:(id)sender {



    if(page==0)

    {



        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Signup" message:@"Are you sure you want to quit signup?" preferredStyle:UIAlertControllerStyleAlert];



        UIAlertAction *ok = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)

                             {

                                 [self.navigationController popViewControllerAnimated:YES];

                                 //BUTTON OK CLICK EVENT

                             }];

        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDestructive handler:nil];

        [alert addAction:cancel];

        [alert addAction:ok];

        [self presentViewController:alert animated:YES completion:nil];

    }

else

{



    [self moveToPreviousStep];

}

    if (page==3){

        self.skipButton.hidden=YES;

    }

}

Supporting code for next button with Firebase specific code,

[ARSLineProgress showWithPresentCompetionBlock:^{





               [[FIRAuth auth] fetchProvidersForEmail:self.signUpEmail.text completion:^(NSArray<NSString *> * _Nullable providers, NSError * _Nullable error) {



                    [ARSLineProgress hideWithCompletionBlock:^{

                   if([providers count]==0)

                   {

                       NSLog(@"email is valid for signup");

                       signingUpFromEmail = TRUE;





                        [self moveToNextStep];

                   }

What should happen,

Upon clicking the back button in view b it should go into view a without getting into Firebase auth function, (maybe it's a pending thread for firebase that needs to purged or it can be handled programatically)

Turns out there were two actions assigned to the back button i.e the MoveNextPage and MoveBackPage in storyboard (rookie mistake as the next button was copied and pasted to back button position in storyboard), so the removal of next button action from storyboard corrected the problem.