title: How do I "hide" a UIRefreshControl?
body: <p>Occasionally my table view won't be connected to a service to refresh, and in that case, I don't want the UIRefreshControl to be present.</p>
  
  <p>After I add it in viewDidLoad, I've tried hiding it under certain circumstances with <code>setEnabled:</code> and <code>setHidden:</code> but neither seems to work.</p>