iPhone - Accessing the parent viewcontroller?

Question

I have 2 viewcontrollers A, B

1. ViewController A is being displayed on the screen
2. The view of ViewController B is added to the view of ViewController A.

How can i access ViewController A from ViewController B without passing a pointer?

self.parentViewController does not work it returns nuil

Answer 1

This should work though its not very elegant:

UIViewController* viewControllerA = 
    (UIViewController*) [[self.view superview] nextResponder];