title: set the padding of a text field using swift in xcode
body: <p>How to create some space at the beginning of a text field using swift? 
  I looked at the post </p>
  
  <p><a href="https://stackoverflow.com/questions/25367502/how-do-i-create-space-at-beginning-of-uitextfield-swift">padding of text field</a></p>
  
  <p>I don't understand what the subclass is doing and how do I use that class to padding.</p>
  
  <p>Thank you very much</p>