hide status bar

//hide status bar

- (BOOL)prefersStatusBarHidden

{

    return YES;

}

-(void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:animated];

    if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {

        // iOS 7

        [self prefersStatusBarHidden];

        [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];

    } else {

        // iOS 6

        [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];

    }

}

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{