title: Submitting login form entry when return key on keyboard is tapped
body: <p>I am looking for write action for done button in default keyboard,</p>
  
  <p>I just created a loginpage with username and password.</p>
  
  <p>The user fill the textfields when keyboard appears.</p>
  
  <p>I want to submit that username and password to the done button in keyboard, instead of adding another submit button in uiview.</p>
  
  <p>What can I do?</p>