Question

Suppose I have a root controller MyViewController, with an instance variable named var1. I assign a value to var1, yet I don’t release it in dealloc method.

My question is what is it going to happen after the app exit?

Answer 1

From dealloc documentation…

Important: Note that when an application terminates, objects may
not be sent a dealloc message since the process’s memory is
automatically cleared on exit—it is more efficient simply to allow the
operating system to clean up resources than to invoke all the memory
management methods. For this and other reasons, you should not manage
scarce resources in dealloc—see “Object Ownership and Disposal” in
Memory Management Programming Guide for more details.