检测某些UIView是否在其他UIViews中被触及

I have 3 UIViews, layered on top of one large uiview. I want to know if the user touches the top one and not care about the other ones. I will have a couple of buttons in the second UIView and a UITable in the 3rd UIView. I have 3 UIViews, layered on top of one large u