Dynamically setting layout on UICollectionView causes inexplicable contentOffset change

Question

According to Apple\'s documentation (and touted at WWDC 2012), it is possible to set the layout on UICollectionView dynamically and even animate the changes:

Answer 1

This finally worked for me (Swift 3)

self.collectionView.collectionViewLayout = UICollectionViewFlowLayout()
self.collectionView.setContentOffset(CGPoint(x: 0, y: -118), animated: true)