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Detect back button touch on UINavigationController

/ Published in: iPhone
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Code taken from comment by 'William Jockusch' in the URL.

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  1. -(void) viewWillDisappear:(BOOL)animated {
  2.     if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
  3.        // back button was pressed.  We know this is true because self is no longer
  4.        // in the navigation stack.  
  5.     }
  6.     [super viewWillDisappear:animated];
  7. }

URL: http://www.comanswer.com/question/setting-action-for-back-button-in-navigation-controller

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