makeSupplementaryView(ofKind:withIdentifier:for:)
Creates or returns a reusable supplementary view of the specified type.
Declaration
func makeSupplementaryView(ofKind elementKind: NSCollectionView.SupplementaryElementKind, withIdentifier identifier: NSUserInterfaceItemIdentifier, for indexPath: IndexPath) -> NSViewParameters
- elementKind:
The kind of supplementary view to create. This value is defined by the layout object. This parameter must not be an empty string or
nil. - identifier:
The reuse identifier for the specified item. This is the identifier you specified when registering the supplementary view. This parameter must not be
nil. - indexPath:
The index path specifying the location of the supplementary view. The data source object receives this information in its Collectionview(_:viewforsupplementaryelementofkind:at:) method and you should just pass it along.
Return Value
A view that adopts the NSCollectionViewElement protocol.
Discussion
This method looks for a recycled supplementary view of the specified type and returns it if one exists. If one does not exist, it creates it using one of the following techniques:
If you used the register(_:forSupplementaryViewOfKind:withIdentifier:) method to register a class for the identifier, this method instantiates your view class and returns it.
If you used the register(_:forSupplementaryViewOfKind:withIdentifier:) method to register a nib file for the identifier, this method loads the view from the nib file and returns it.