prepareForTransition(from:)
Prepares the layout object to be installed in the collection view.
Declaration
func prepareForTransition(from oldLayout: NSCollectionViewLayout)Parameters
- oldLayout:
The layout object installed in the collection view at the beginning of the transition. You might use this object to retrieve the current layout attributes for items and views.
Discussion
Prior to transitioning to a new layout object, the collection view calls this method on the new layout object to give it time to perform any initial calculations.