Navigation Controller

Question

In my application, i have a navigation controller. I have added a back button to go to the login screen (UIViewController). How do i go back to the login screen from the navigation controller?

This is the code for my back button.

(void)viewDidLoad
{

    [super viewDidLoad];

    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonSystemItemCancel target:self action:@selector(goBacktoLogin)];

    self.navigationItem.leftBarButtonItem = backButton;

}

(void) goBacktoLogin

{

    LoginViewController *loginViewController = [[ LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil];

[[ self navigationController] popToViewController:loginViewController animated:YES];


}

I am getting the following error:

* Terminating app due to uncaught exception 'NSInternalInconsistencyException',

reason: 'Tried to pop to a view controller that doesn't exist.'

Is the login view always the first one and can you have more navigation levels? — sergio, Jul 02 '12 at 08:57

score 1 · Answer 1 · answered Jul 02 '12 at 08:58

1

If you need to go back to the very first view controller in your navigation hierarchy, then use:

[self.navigationController popToRootViewControllerAnimated:YES];

answered Jul 02 '12 at 08:58

sergio

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score 0 · Answer 2 · answered Aug 01 '12 at 10:00

Your question is not clear to me. But I think this could help:

Push login controller in to the navigation stack using this,

LoginViewController *loginViewController = [[ LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil];

self.navigationController pushViewController:loginViewController animated:NO];

and in the pushed screen(login view controller):

push another controller. Then add a back button. on click of it

execute this command:

[self.navigationController popViewControllerAnimated:YES];

Navigation Controller

2 Answers2