invalidatedSupplementaryIndexPaths
A dictionary containing the supplementary views whose layout attributes are invalid.
Declaration
var invalidatedSupplementaryIndexPaths: [NSCollectionView.SupplementaryElementKind : Set<IndexPath>]? { get }Discussion
The keys in this dictionary are the element kind strings of the supplementary views. The value for each key is an NSSet object containing one or more NSIndexPath objects, each of which identifies the section containing the supplementary view.