（iPhone）pushViewController popViewController保留并释放吗？

Question

I wonder push/pop viewController on navigation stack would retain/release the viewcontroller.
It's not documented in apple doc.

I saw someone saying push retains. But is it documented or ok to believe that?

Thank you

Answer 1

It definitely does retain on push and release on pop. I would say in this case it simply follows the convention of taking ownership of objects that you need to work with, that's probably why the documentation doesn't mention it explicitly.