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

Update for Swift 3

func viewScrollButton() {
    let lastItem = collectionView(self.collectionView!, numberOfRowsInSection: 0) - 1
    let indexPath: NSIndexPath = NSIndexPath.init(item: lastItem, section: 0)
    self.collectionView.scrollToRow(at: indexPath as IndexPath, at: .bottom, animated: false)
}