title: viewWillAppear and UIApplicationDidBecomeActiveNotification
body: <p>I am using the UIApplicationDidBecomeActiveNotification to refresh my tableview when the app becomes active.  My problem is that in my ViewWillAppear, I am also calling a method to refresh this table's data.</p>
  
  <p>This is causing the table to be refreshed twice upon application launch.  How can I get one of them not to fire when the app is initially launched?  Refreshing the table has some intensive processing of network and local data.. so I would really like o only perform this action once.</p>
  
  <p>Thanks.</p>