Move a view when scrolling in UITableView

Question

I have a UIView with a UITableView below it:

Answer 1

Swift 3 & 4:

    var oldContentOffset = CGPoint.zero
    let topConstraintRange = (CGFloat(0).. 0 && yourConstraint.constant > topConstraintRange.lowerBound && scrollView.contentOffset.y > 0 {
            yourConstraint.constant -= delta
            scrollView.contentOffset.y -= delta
        }

        //we expand the top view
        if delta < 0 && yourConstraint.constant < topConstraintRange.upperBound && scrollView.contentOffset.y < 0{
            yourConstraint.constant -= delta
            scrollView.contentOffset.y -= delta
        }
        oldContentOffset = scrollView.contentOffset
    }