gistfile1.m

[self.tabBarController.view setFrame: CGRectMake([[UIScreen mainScreen] applicationFrame].origin.x,
                                                  [[UIScreen mainScreen] applicationFrame].origin.y,
                                                  [[UIScreen mainScreen] applicationFrame].size.width,
                                                  [[UIScreen mainScreen] applicationFrame].size.height - self.tabBarController.tabBar.frame.size.height)];