public override nint GetItemsCount(UICollectionView collectionView, nint section)
{
var count = _itemsSource.Count;
if (_wasEmpty && count > 0)
{
// We've moved from no items to having at least one item; it's likely that the layout needs to update
// its cell size/estimate
_layout?.SetNeedCellSizeUpdate();
}
_wasEmpty = count == 0;
return(count);
}
