Question

Is the following true?

When the app is about to quit, it’s
not necessary to clean up the memory
by calling release on all your
retained objects, because the iPhone
OS will reclaim the memory it
allocated for your app when you
launched it. This is faster and safer
than rely on the apps to correctly
clean up after themselves. You can
verify this by putting an NSLog call
(or a debugger breakpoint) in the
dealloc method of your application
delegate and seeing it’s never called.

So, cleaning things up when the app is
about to quit is useless. Moreover,
you have very limited time before the
OS wipes your app out, so don’t waste
it on cleaning things. Focus on saving
your game and any other relevant
stuff.

Source (cocos2d-iphone.org)

Answer 1

Yes. Quoting the documentation:

Important: 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. This has
implications for how you implement a
dealloc method—see “Resource
Management.”