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

Easy.

Animate your new layout and collectionView's contentOffset in the same animation block.

[UIView animateWithDuration:0.3 animations:^{
                                 [self.collectionView setCollectionViewLayout:self.someLayout animated:YES completion:nil];
                                 [self.collectionView setContentOffset:CGPointMake(0, -64)];
                             } completion:nil];

It will keep self.collectionView.contentOffset constant.