Handy trick: trap back button in a UINavigationController stack

- (void)didMoveToParentViewController:(UIViewController *)parent
	[super didMoveToParentViewController:parent];

	if (![parent isEqual:self.parentViewController]) {

Inserted into a view controller pushed into a UINavigationController stack, this will fire the ‘back’ message when the user presses ‘Back’ to back up the view controller stack.

As seen on Stack Overflow

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