title: How can I show done button on the decimal pad keyboard?
body: <p>I'm trying to learn Swift and I've done on the view screens. But as you can understand more easily by checking the screenshot, when I enter a value into a text field, there isn't any done button showing up so I can not hide the keyboard from the screen. And that makes it impossible to press the submit button which is located bottom of the screen view.</p>
  
  <p><img src="https://i.stack.imgur.com/lQxmx.png" alt="screenshoot while the keyboard is being shown"></p>
  
  <p><img src="https://i.stack.imgur.com/Niit8.png" alt="screenshoot while the keyboard is closed"></p>