How to change text on a back button

Question

By default the back button uses as a text on it a title of a viewcontroller. Can I change text on the back button without changing a title of a view controller? I need this

Answer 1

Marc W's approach worked great once I figured out which controller to apply it to: the one being re-titled, not the one on top. So if this is the navigation stack:

(bottom)  ControllerA -> ControllerB  (top)

...and you want to give a shorter title for ControllerA in the back-button displayed when ControllerB is on top, you apply the property change to ControllerA.

So it's more in the context of self.title, not like the other left/right-bar-button setters.