private CGPoint?GetSnapScrollPosition(UIScrollView scrollView, nfloat velocity, CGPoint offset)
        {
            CarouselCollectionView collectionView = null;

            if (!_collectionView.TryGetTarget(out collectionView))
            {
                return(null);
            }

            var count = _carousel?.Items?.Count;

            if (!(count >= 0))
            {
                return(null);
            }


            var location     = velocity >= 0 ? offset : new CGPoint(offset.X + collectionView.Frame.Width, 0);
            var currentIndex = collectionView.IndexPathForItemAtPoint(location);

            if (currentIndex == null)
            {
                return(null);
            }

            var         currentRect = collectionView.GetLayoutAttributesForItem(currentIndex);
            NSIndexPath newIndex    = currentIndex;

            if ((Math.Abs(velocity) > _velocityThreshold && velocity > 0 ||
                 offset.X > currentRect.Frame.Left + currentRect.Bounds.Size.Width / 2) &&
                currentIndex.Row < count - 1)
            {
                newIndex = NSIndexPath.FromRowSection(currentIndex.Row + 1, 0);
            }
            else if ((Math.Abs(velocity) > _velocityThreshold && velocity < 0 ||
                      offset.X < currentRect.Frame.Left - currentRect.Bounds.Size.Width / 2) &&
                     currentIndex.Row > 0)
            {
                newIndex = NSIndexPath.FromRowSection(currentIndex.Row - 1, 0);
            }

            UICollectionViewLayoutAttributes newRect = currentRect;

            if (newIndex != currentIndex)
            {
                CurrentIndex = newIndex.Row;
                newRect      = collectionView.GetLayoutAttributesForItem(newIndex);
                var item = _carousel.Items[CurrentIndex];
                _carousel.Current = item;
            }

            return(newRect.Frame.Location);
        }
        public void SnapToCurrentIndex(bool animated = true)
        {
            if (!(CurrentIndex >= 0 && _carousel?.Items?.Count > 0))
            {
                return;
            }

            CarouselCollectionView collectionView = null;

            if (!_collectionView.TryGetTarget(out collectionView))
            {
                return;
            }
            var index    = NSIndexPath.FromRowSection(CurrentIndex, 0);
            var rect     = collectionView.GetLayoutAttributesForItem(index);
            var duration = animated ? 0.2f : 0f;

            UIView.Animate(duration, () => {
                collectionView.ContentOffset = rect.Frame.Location;
            });
        }