How to get UIScrollView vertical direction in Swift?

Question

How can I get the scroll/swipe direction for up/down in a VC?

I want to add a UIScrollView or something else in my VC that can see if the user swipes/scrolls up or d

Answer 1

you could do something like this:

fileprivate var lastContentOffset: CGPoint = .zero

func checkScrollDirection(_ scrollView: UIScrollView) -> UIScrollViewDirection {
    return lastContentOffset.y > scrollView.contentOffset.y ? .up : .down
}

and with scrollViewDelegate:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    switch checkScrollDirection(scrollView) {
    case .up:
        // move up
    case .down:
        // move down
    default:
        break
    }

    lastContentOffset = scrollView.contentOffset
}