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, so the back button is automatically coming.

Here I need to make an alert when the user presses the back button.

How can I do this?

Answer 1

Or you can use the UINavigationController's delegate methods. The method willShowViewController is called when the back button of your VC is pressed.

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;

Answer 2

First hide the back button by using

self.navigationItem.hidesBackButton = YES;

and then create your own Custom Button:

UIBarButtonItem *backBtn =[[UIBarButtonItem alloc]initWithTitle:@"back" style:UIBarButtonItemStyleDone target:self action:@selector(popAlertAction:)];
self.navigationItem.leftBarButtonItem=backBtn;
[backBtn release];

and your selector is here:

- (void)popAlertAction:(UIBarButtonItem*)sender
{
    //Do ur stuff for pop up
}