How to detect when a UIScrollView has finished scrolling

UIScrollViewScrolling.swift

// http://stackoverflow.com/questions/993280/how-to-detect-when-a-uiscrollview-has-finished-scrolling

    func scrollViewDidScroll(scrollView: UIScrollView) {
        performSelector(#selector(UIScrollViewDelegate.scrollViewDidEndScrollingAnimation(_:)), withObject: nil, afterDelay: 0.3)
    }

    func scrollViewDidEndScrollingAnimation(scrollView: UIScrollView) {
        print("scrollViewDidEndDecelerating")

        NSObject.cancelPreviousPerformRequestsWithTarget(self)

        refreshArtworks()

    }

    func refreshArtworks() {
        

        if let userlikeArray = userlikeArray {
            
            for indexPath in tableView.indexPathsForVisibleRows! {
                if let cell = self.tableView.cellForRowAtIndexPath(indexPath) as? LikesTableViewCell {
                    
                }
            }
        }
    }