back button callback in navigationController in iOS

ios callback uinavigationcontroller uinavigationitem back
Namratha picture Namratha · Mar 7, 2011 · Viewed 110.2k times · Source

I have pushed a view onto the navigation controller and when I press the back button it goes to the previous view automatically. I want to do a few things when back button is pressed before popping the view off the stack. Which is the back button callback function?

Answer

ymutlu picture ymutlu · Jul 9, 2012

William Jockusch's answer solve this problem with easy trick.

-(void) viewWillDisappear:(BOOL)animated {
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
       // back button was pressed.  We know this is true because self is no longer
       // in the navigation stack.  
    }
    [super viewWillDisappear:animated];
}

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