Push to ViewController without back button

Question

I am developing an iOS app which contains login/authentication functionality - basically first time a user logins, in they need to enter relevant login details - then they are passed to main app screens - subsequent visits to the app they will be automatically authenticated.

All above works fine - the issue I have is with the Navigation bar - it appears in the main screen in the main part of the app with a back button - I don't want this to be displayed as they should not be able to return to the login screen once authenticated. I guess it's using the root navigation controller which explains the logic, but is there a way to ignore the navigation controller of the login section so the back button is not displayed in the main app.

Below is a screenshot of the structure to help my explanation - left hand group of screens are the login process right hand is the main app structure.

The code used to switch screens is as follows -

SWRevealViewController *swRevealController = (SWRevealViewController *)navVC;
swRevealController.managedObjectContext = self.managedObjectContext;
[self.navigationController pushViewController:controller animated:YES];

Answer 1

In the Screen which implements after login, the ViewDidLoad method add the line to hide back bar button.

self.navigationItem.hidesBackButton = YES;

Additionally you can add an 'Logout' option as

UIBarButtonItem *backBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Logout" style:UIBarButtonItemStyleBordered
                                                                 target:self
                                                                 action:@selector(LogoutClick)];
self.navigationItem.leftBarButtonItem = backBarButton;

-(void)LogoutClick {
    [self showLogoutAlert];
}

-(void)showLogoutAlert {

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@""
                                                message:@"Do you want to Logout ?"
                                                       delegate:self
                                              cancelButtonTitle:@"Cancel"
                                              otherButtonTitles:@"Logout", nil];
    [alert show];
}


- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

    if (buttonIndex == 1) {
        [self.navigationController popToRootViewControllerAnimated:YES];
    }
}