title: Is there any way for a view controller in iOS 5 to specify an image to be used in a back button on a navigation stack push over it?
body: <p>I have Controller A and controller B is pushed on top of it in a navigation stack. Is there anyway for controller A to specify an image (say controller A is some sort of list so it specifies a list image) and then controller B's navigation item's back button automatically shows that as the back button image?</p>