title: How to continue animate refresh control on view changed
body: <p>I have a table in view "A" that is inside a tab bar controller. When I scroll down to reload the table refresh control start animating.When press tab bar controller going in view "B" and later go back to view "A", refresh control is visible but isn't animating.</p>
  
  <p>Can someone help me? thank</p>
  
  <pre><code>func refresh(sender:AnyObject)
  {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { () -&gt; Void in
  
      Call API for data
      dispatch_async(dispatch_get_main_queue(), { () -&gt; Void in
  
                  UPDATE UI
                  refreshControl.endRefreshing()
  
              })
          });
  }
  
  override func viewDidAppear(animated: Bool)
  {
      if(requestTerminated == false)
      {
         //Continue animate refresh control somehow
      }
  }
  </code></pre>