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