How do I hide/show the right button in the Navigation Bar

Question

I need to hide the right button in the Navigation Bar, then unhide it after the user selects some options.

Unfortunately, the following doesn\'t work:

Answer 1

Set reference to nil:

current_controller_in_navcontroller.navigationItem.rightBarButtonItem =  nil;

Also be sure to call this in the controller currently shown by the navController, not for the navController itself.