NSCollectionViewDiffableDataSourceReferenceSupplementaryViewProvider
A closure that configures and returns a collection view’s supplementary view, such as a header or footer, from a diffable data source.
Declaration
typealias NSCollectionViewDiffableDataSourceReferenceSupplementaryViewProvider = (NSCollectionView, String, IndexPath) -> NSView?Parameters
- collectionView:
The collection view to configure this supplementary view for.
- kind:
The kind of supplementary view to provide. The layout object that supports the supplementary view defines the value of this string.
- indexPath:
The index path that specifies the location of the supplementary view in the collection view.
Return Value
A non-nil configured supplementary view object. The supplementary view provider must return a valid view object to the collection view.