title: iOS - Crash on [self.navigationController setToolbarHidden:YES animated:NO] Deallocated error
body: <p>I have a crash on <code>[self.navigationController setToolbarHidden:NO animated:YES]</code> located in my viewWillAppear when I come back to the UIViewController using that toolbar. With this Error <code>*** -[CALayer retain]: Message sent to deallocated instace 0x5d0e0a0</code> I am not expressly releasing the toolbar but the class where I am setting it is autoreleased.</p>
  
  <p>Also am I incorrect in assuming that the toolbar is on the navigationController? </p>