缩放 - 弹跳时，UIScrollView的zoomScale属性不会更新

Right now I have a view that is outside of the UIScrollView. For many reasons, it cannot be simply inside the scrollview. So right now what i'm doing is, as the UIScrollView is scaled/panned, I update my other auxiliary view. The only issue i'm coming into is, the zoomScale value is not adjusted for while the view is bouncing back to either the minimum or maximum scale. Any suggestions on how to obtain this value while it animates back?Right now I have a view that is outside of the