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UIScrollView should only scroll down

I have a scrollview and I want this scroll to only show the scroll down , and it shouldn't scroll in any other direction. This is not about horizontal or vertical, but rather that I want the scrolling to only scroll down and not up in vertical mode.

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Subclass UIScrollView and override the methods to limit horizontal scrolling and scroll down only:



class DownwardsOnlyScrollView: UIScrollView
{
    override func setContentOffset(_ contentOffset: CGPoint, animated: Bool) {
        // restrict movement to vertical only
        let newOffset = CGPoint(x: 0, y: contentOffset.y)

        //only scroll if scroll direction is downwards
        if newOffset.y > self.contentOffset.y
        {
            super.setContentOffset(newOffset, animated: animated)
        }
    }
}
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