UIImage缩放方面填充和剪辑子视图在UICollectionView中不起作用

I have a UICollectionView with a cell containing a single UIImageView. I'm setting the UIImageView frame.size to match the cell's frame.size and also explicitly asking the UIImageView to Scale with Aspect Fill & Clip Subview the following way in I have a UICollectionView with a cell containin