UINavigationController and back button action

Question

I have an two controllers 1st is self and 2nd is maincontroller, where I\'m pushing maincontroller in stack

Answer 1

Create your own UIBarButtonItem and set it as the leftBarButtonItem in viewDidLoad method of mainController.

For example (here I used a system item but you can also create a different one, see class reference for details).

UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(showAlertView:)];
self.navigationItem.leftBarButtonItem = leftBarButtonItem;

// only if you don't use ARC
// [leftBarButtonItem release];

where

- (void)showAlertView:(id)sender
{
    // alert view here...
}