点击测试以避免子视图，但希望其他子视图工作

I have a background subview which just have grey color's, and got tiles on top of it which can be dragged. This is all happening in one view controller. The problem is that when I do a hit test and try to avoid the backgroundView, since the tiles are on top of that view, it still see's those coordinates and avoid the touches move event since I am returning nil. I have a background subview which just have gre