如何使UICollection视图的背景透明而不使其中的单元格在Swift中透明

I have a collection view and of course I also have the cells in it. If in the property inspector I change the alpha of collection view to 0, the cells in it also become transparent. Is there a way to make the background transparent of the collection view only so the image behind it is visible? I have a collection view and of course I also h