iOS - 重新加载单元格时,UICollectionView阴影闪烁

Question

在我的集合视图中,我在集合单元格中添加了带阴影的自定义视图.

我使用以下代码将阴影添加到视图中.

    cell.shadowView.backgroundColor = [UIColor greenColor];
    cell.shadowView.layer.masksToBounds = NO;
    cell.shadowView.layer.shadowColor = [UIColor redColor].CGColor;
    cell.shadowView.layer.shadowOffset = CGSizeMake(-2.0f, 2.0f);
    cell.shadowView.layer.shadowOpacity = 1.0f;
    cell.shadowView.layer.shadowRadius = 4.0f;
    cell.shadowView.layer.shouldRasterize = YES;
    cell.shadowView.layer.rasterizationScale = [UIScreen mainScreen].scale;

每当我重新加载单元格时,重新加载的单元格每次都会闪烁.以下代码用于重新加载单元格.

    [self.collectionView performBatchUpdates:^{
        NSIndexPath* indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
        NSArray* indexPathArray = [NSArray arrayWithObjects:indexPath, nil];
        [self.collectionView reloadItemsAtIndexPaths:indexPathArray];

    } completion:nil];

我想在重新加载单元格时避免这种闪烁.

我可以通过在[UIView performWithoutAnimation:^ {}]动画块中运行performBatchUpdates来避免闪烁.但它会导致现有动画代码破损.

有没有办法避免这个闪烁的问题？

谢谢.