Question

How do I play a sound ONLY when the “back” button is tapped in a UINavigationBar?

Answer 1

To do so, you will need to replace usual “back” button with new one, with your code of playing sound:

//in ViewDidLoad:

    UIBarButtonItem *barBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(pop:)];
    self.navigationItem.leftBarButtonItem = barBtnItem;
    [barBtnItem release];

//action:
- (IBAction)pop:(id)sender {
    //your code of playing sound here
    [self.navigationController popViewControllerAnimated:YES];
}

But note, that it will not look like usual “back” button. It will be rectangle. If you what it to look like usual “back” button, implement it like a custom button with cusom image (like usual “back” button)