title: Updating an iPhone app to Universal app
body: <p>I have one existing app for iphone with tabBarController and NavigationController.Now i want to make it universal app with splitView functionality for ipad.
  Now my question is can i take another mainWindow for ipad or give condition for ipad in appDelegate?which is the better way to make it universal with splitView functionlity.</p>
  
  <p>please suggest me the way to do this.</p>