title: using pull_to_refresh in view controller in Swift
body: <p>i'm so beginner developer in ios world, and it's the first time i try to make a little application. 
  my app used UItableview to show the content i've get it from server, i use this tutorial: <a href="https://www.youtube.com/watch?v=JG_AMY_gSDQ" rel="nofollow">https://www.youtube.com/watch?v=JG_AMY_gSDQ</a>
  in this tutorial: they used the main view controller and add table view to it, so when i try to add pull to refresh to my view, i can't because i didn't use UITableViewController. 
  so is there any way to refresh my content without using UITableViewController ?
  and thank you so mush for answering.</p>