chiahsien/UICollectionViewWaterfallLayout — pull request #7 by bm-i (2013-03-18 10:50:22+00:00)
Title: Improve rotation animation

When calculating the new layout information before the rotation animation begins (willAnimateRotationToInterfaceOrientation) instead of when it is finished (didRotateFromInterfaceOrientation), the UICollectionView will nicely transition the two states.