ioscallbackuinavigationcontrolleruinavigationitemback

back button callback in navigationController in iOS


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?


Solution

  • 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];
    }