iOS - How to make the tableview use paginated API output?

Question

An API I am writing has about 2000 records, returned in JSON via a simple RESTful API I have written.

To reduce issues with lots of data, I want to use pagination so

Answer 1

For Swift

func scrollViewDidScroll(scrollView: UIScrollView) {
        if collectionViewGif.contentOffset.y >= self.collectionViewGif.contentSize.height - self.collectionViewGif.frame.size.height
        {
            offset = offset + 1
            self.fetchGifWithPaination(defaultText)
        }
    }