title: Add a done button in a UINavigationbar
body: <p>How does one add a done button to a UINavigationbar when the user touches a specific textfield or textview?</p>
  
  <p>Or would a better way be to detect when the keyboard is showing, and then display the button. </p>
  
  <p>I would like the done button to dismiss the keyboard like in standard Notes application.</p>