TabBar hiding

TabBarHidingCollectionViewController.m

//.h
@interface TabBarHidingCollectionViewController : UICollectionViewController
@end

//.m
@interface TabBarHidingCollectionViewController ()
@property (nonatomic) CGFloat lastOffsetY;
@end

@implementation TabBarHidingCollectionViewController

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    self.lastOffsetY = scrollView.contentOffset.y;
}

-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
    CGFloat currentOffsetY = scrollView.contentOffset.y;
    BOOL shouldHide = (targetContentOffset->y <= 0.0)? false : (self.lastOffsetY < currentOffsetY);
    [self showHideTabBar:shouldHide];
}

-(void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
{
    [self showHideTabBar:NO];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self showHideTabBar:NO];
}

-(void)showHideTabBar:(BOOL)isHidden
{
    if (IS_PHONE)
    {
        GGIAppDelegate *mainApp = (GGIAppDelegate*)[UIApplication sharedApplication].delegate;
        UITabBarController *tabBar = mainApp.tabBarController;
        [tabBar setHidden:isHidden];
    }
}

@end