Scroll UICollectionView to bottom

For Swift -

For Horizontal Scrolling - .right

For Vertical Scrolling - .bottom

override func viewDidLayoutSubviews() {
        let section = 0
        let lastItemIndex = self.dateCollectionView.numberOfItemsInSection(section) - 1
        let indexPath:NSIndexPath = NSIndexPath.init(forItem: lastItemIndex, inSection: section)
        self.dateCollectionView.scrollToItemAtIndexPath(indexPath, atScrollPosition: .right, animated: false)
    }

For Swift 3 and multiple sections

/**

 This method scrolls the *UICollectionView* to the last item in the last section

 */

func scrollToLastItem() {

    let lastSection = collectionView.numberOfSections - 1

    let lastRow = collectionView.numberOfItems(inSection: lastSection)

    let indexPath = IndexPath(row: lastRow - 1, section: lastSection)

    self.collectionView.scrollToItem(at: indexPath, at: .right, animated: true)

}

I have added the lines below to run once the query is complete.

var item = self.collectionView(self.collectionView!, numberOfItemsInSection: 0) - 1
var lastItemIndex = NSIndexPath(forItem: item, inSection: 0)
self.collectionView?.scrollToItemAtIndexPath(lastItemIndex, atScrollPosition: UICollectionViewScrollPosition.Top, animated: false)

Update to Swift 5

let item = self.collectionView(self.collectionView, numberOfItemsInSection: 0) - 1
let lastItemIndex = IndexPath(item: item, section: 0)
self.collectionView.scrollToItem(at: lastItemIndex, at: .top, animated: true)

Updated for Swift 3:

let item = self.collectionView(self.collectionView!, numberOfItemsInSection: 0) - 1
let lastItemIndex = IndexPath(item: item, section: 0)
collectionView?.scrollToItem(at: lastItemIndex, at: UICollectionViewScrollPosition.top, animated: true)