@property UICollectionReusableView *collectionHeaderView;

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
     CGPoint translation = [scrollView.panGestureRecognizer translationInView:scrollView.superview];

     if(translation.y > 0)
     {
        //dragging down
        collectionHeaderView.backgroundColor = <#Whatever you need#>;
     } else
     {
         // dragging up
         collectionHeaderView.backgroundColor = [UIColor clearColor];
     }
 }