UIScrollView, reaching the bottom of the scroll view

Question

I know the Apple documentation has the following delegate method:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;      // called when scroll         


        

Answer 1

Actually, rather than just putting @bensnider's code in scrollViewDidScroll, this code (written in Swift 3) would be better performance-wise:

func scrollViewDidEndDragging(_ scrollView: UIScrollView,
                              willDecelerate decelerate: Bool) {
    if !decelerate {
        checkHasScrolledToBottom()
    }
}

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    checkHasScrolledToBottom()
}

func checkHasScrolledToBottom() {
    let bottomEdge = scrollView.contentOffset.y + scrollView.frame.size.height
    if bottomEdge >= scrollView.contentSize.height {
        // we are at the end
    }
}