How to hide your navigation bar when the keyboard shows: hidesBarsWhenKeyboardAppears
Showing the keyboard on an iPhone dramatically reduces how much space you have available, which is particularly annoying if the user is trying to type into a multi-line text view.
One simple way you can free up space is by setting to true the hidesBarsWhenKeyboardAppears property of your navigation controller – that will cause the navigation bar and any toolbars to hide themselves when the keyboard is shown.
Use this code to enable it:
navigationController?.hidesBarsWhenKeyboardAppears = trueAvailable from iOS 8.0
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