invalidateItems(at:)
Marks the specified items as invalid so that their layout information can be updated.
Declaration
func invalidateItems(at indexPaths: Set<IndexPath>)Parameters
- indexPaths:
A set of Nsindexpath objects. Each index path represents an item whose layout needs to be recomputed.
Discussion
Call this method when you want the layout object to recompute attributes for a specific set of items. The items you provide are added to the invalidatedItemIndexPaths property. You can call this method more than once to create a merged set of items.