Scroll UICollectionView to bottom

Question

I would like to scroll the UICollectionView to the bottom so the last item is in the view. I have tried to use scrollToItemAtIndexPath but it does not seem to be working. I want

Answer 1

Here's my take in Swift5:

extension UICollectionView {

    public func scrollToLastItem(at scrollPosition: UICollectionView.ScrollPosition, adjustment: CGFloat = 0.0, withAdjustmentDuration duration: TimeInterval = 0.5) {
        let lastSection = self.numberOfSections - 1
        let lastRowInLastSection = self.numberOfItems(inSection: lastSection)
        if lastSection > 0, lastRowInLastSection > 0 {
            let indexPath = IndexPath(row: lastRowInLastSection - 1, section: lastSection)
            let visibleIndexPaths = self.indexPathsForVisibleItems
            if !visibleIndexPaths.contains(indexPath) {
                self.self.scrollToItem(at: indexPath, at: scrollPosition, animated: true)
                UIView.animate(withDuration: duration) {
                    switch scrollPosition {
                    case .top, .bottom, .centeredVertically:
                        self.contentOffset.y += adjustment
                    case .left, .right, .centeredHorizontally:
                        self.contentOffset.x += adjustment
                    default:
                        print("Inavlid scrollPosition: \(scrollPosition)")
                    }
                }
            }
        }
    }
}