iPhone - Accessing the parent viewcontroller?

I have 2 viewcontrollers A, B

1. ViewController A is being displ开发者_如何转开发ayed 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

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Why is the view of viewController B added to the view of viewController A? If you are meaning to add a view to viewController A, you can do that by allocating a new UIView and displaying that on top of the current view.

On the other hand if you are trying to transition from one view controller to another, i.e going from A to B and then back to A, you should use a UINavigationController as specified in the View Controller Programming Guide in the Apple Documentation.

Source: View Controller Programming Guide

EDIT: If you want to use [[self parentViewController] yourMethodHere]; you will need a view hierarchy, for which you can use the UINavigationController. In your current scheme there is no hierarchy built so there is no parent view controller.

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This should work though its not very elegant:

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