Are there any scenarios in which dealloc will be called without viewWillDisappear, not called?

Question

In the controller, we added the observer to viewDidAppearand deleted it in viewWillDisappear. There is init/viewDidLoadno observer.

In this case, the bottom line for security purposes / is required in the method dealloc?

[[NSNotificationCenter defaultCenter] removeObserver:self];

Now the question arises / are there any scenarios in which it deallocwill be called without viewWillDisappearwhich will not be called? How about when memory alerts are triggered. What happens in these cases?

Thank.

Answer 1

One of the scenarios:

• VC1implements a class HelperVC, it delegates and adds HelperVCas you view it.
• HelperVC closeAll , VC1.
• closeAll VC1 HelperVC nil.
• dealloc HelperVC viewWillDisappear. HelperVC, HelperVC nil.