init(elementKind:handler:)
Creates a supplementary registration for the specified element kind with a registration handler.
Declaration
init(elementKind: String, handler: @escaping UICollectionView.SupplementaryRegistration<Supplementary>.Handler)Creates a supplementary registration for the specified element kind with a registration handler.
init(elementKind: String, handler: @escaping UICollectionView.SupplementaryRegistration<Supplementary>.Handler)