viewWillDisappear is not called

Question

I'm using a navigationController in my app. One UI i have tried to click one button (Not in Navigation bar) viewWillDisappear is not called. But i'm not using the navigationController it's calling the viewWillDisappear. Can you please help me how to call the viewWillDisappear with a navigationController?

Answer 1

So, first of all - (void)viewWillDisappear:(BOOL)animated is a method specific to UIViewController class.

Second, this method shouldn't be called directly from the code, this method is called automatically when a UIViewController is removed from a view hierarchy. (check UIViewController specs)

So in order to handle this method call, you have to implement it in your custom UIViewController class (do not forget to call [super viewWillDisappear:animated]). Whenever your custom UIViewController view will disappear from the screen (is popped from the stack or other UIViewController is added to the stack) this method will be called.