title: multi viewcontroller and full screen
body: <p>I have a project in which I prefer only display full screen mode in one viewcontroller's view.
  I used <code>[[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]</code> to hide the status bar in the sub view controller.</p>
  
  <p>The time display and battery icon disappeared, but there is a blank  white block replaced statusbar.</p>
  
  <p>I sticked on it for 2 days, still can not solve.</p>
  
  <p>Welcome any comment.</p>
  
  <p>Thanks</p>
  
  <p>interdev</p>