Returns the layout information for the specified supplementary view.
- iOS 6.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
A string specifying the kind of supplementary view whose layout attributes you want. Layout classes are responsible for defining the kinds of supplementary views they support.
The index path of the supplementary view. The interpretation of this value depends on how the layout implements the view. For example, a view associated with a section might contain just a section value.
The layout attributes of the supplementary view or
nil if the specified supplementary view does not exist.
Use this method to retrieve the layout information for a particular supplementary view. You should always use this method instead of querying the layout object directly.