Classes

Push/pull views when the keyboard appears and disappears.

In your UIViewController, add a KeyboardManager property:

   var kb: KeyboardManager?

In viewWillAppear(_:), initialize it and use the according method to subscribe to the show and hide notifications:

   override func viewWillAppear(_ animated: Bool) {
       super.viewWillAppear(animated)

       kb = KeyboardManager(viewsToPushUp: [textField, button])
       kb?.pushViewsUpWhenKeyboardWillShow()
       kb?.pullViewsDownWhenKeyboardWillHide()
   }

Although not necessary anymore, if you want to stop listening to the notifications, you can call kb?.stopListeningToKeyboardNotifications() within viewWillDisappear(_:) for example.

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public class KeyboardManager

A class used to run a function only once.

Example:

   let ur = UniqueRunner()
   var result = ur.runOnce(addNumbers(2, 2))
   result = ur.runOnce(addNumbers(5, 5))
   result = ur.runOnce(addNumbers(10, 10))

   result == 4 // true

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public class UniqueRunner