Here is a nice and simple way to hide the status bar in iOS 7

Hide the UIStatusBar in iOS 7

//Place in viewDidLoad
if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
        // iOS 7
        [self prefersStatusBarHidden];
        [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
    } else {
        // iOS 6
        [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
    }
    

//Place underneath viewDidLoad
- (BOOL)prefersStatusBarHidden {
    return YES;
  }