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

You can use text attributes to hide a bar button:

barButton.enabled = false
barButton.setTitleTextAttributes([NSForegroundColorAttributeName : UIColor.clearColor()], forState: .Normal)

Also see my solution with UIBarButtonItem extension for the similar question: Make a UIBarButtonItem disapear using swift IOS