Scroll UICollectionView to bottom

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)

}

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)
}

**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)

lstMessages.reloadData()
let item = self.collectionView(lstMessages, numberOfItemsInSection: 0) - 1
let lastItemIndex = NSIndexPath(forItem: item, inSection: 0)
lstMessages.scrollToItemAtIndexPath(lastItemIndex, atScrollPosition: UICollectionViewScrollPosition.Top, animated: false)

Where lstMessages is my collectionView