How do I show/hide a UIBarButtonItem?

Question

I created a toolbar in IB with several buttons. I would like to be able to hide/show one of the buttons depending on the state of the data in the main window.

Answer 1

In case the UIBarButtonItem has an image instead of the text in it you can do this to hide it: navigationBar.topItem.rightBarButtonItem.customView.alpha = 0.0;