UICollectionView滑动到指定组 组头上移问题

ifletattributes =self.collect_Var3_View.layoutAttributesForItem(at:IndexPath(item:0, section: $0)) {

                self.collect_Var3_View.setContentOffset(CGPoint(x:0, y: attributes.frame.minY-_Num(key:44)), animated:true)

            }