title: How to add checkbox to uicollectionview in swift
body: <p>some time ago someone already asked this question and a few answers were given but i didn't really understand any of them. So i was wondering if anyone could please write an easy to understand tutorial on how to do the things shown on the image below:</p>
  
  <p><a href="http://i.imgur.com/BzIBOkH.jpg?1" rel="nofollow">http://i.imgur.com/BzIBOkH.jpg?1</a></p>
  
  <p>I would be so greatful if anyone can share exactly how to this because it looks really cool and i would love to use something similar in my application</p>