How to automatically call a method after popping a view controller off the stack on the iPhone

I need to update the parent view on an iPhone after popping a child view off the navigation stack. How can I setup the parent view to be notified or receive an automatic method call when the child is popped off the stack and the parent becomes visible again?

The user enters data on the child page that I want to display on the parent page after the user is done and pops the view.

Thanks for you help!