As of iOS 8.0 it's easy to make a navigation bar automatically hide when the user taps the screen, but only when it's part of a
UINavigationController. When set to
hidesBarsOnTap property of a navigation controller automatically adds a tap gesture recognizer to your view to handle hiding (and showing) the navigation bar as needed.
navigationController?.hidesBarsOnTap = true
Remember to set this back to
false when you want to stop the behavior from happening.
Available from iOS 8.0 – see Hacking with Swift tutorial 1
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