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

For Swift 3

if let button = self.navigationItem.rightBarButtonItem {
                    button.isEnabled = false
                    button.tintColor = UIColor.clear
                }`