Returns an array of the actively managed supplementary views in the collection view.
- macOS 10.11+
The kind of the supplementary views you want returned. The layout object defines the kinds of supplementary views it supports. This parameter must not be
An array of view objects. The returned array may be empty.
The views returned by this method represent the ones that are active and are currently being managed by the collection view. The array may contain supplementary views that are outside of the collection view’s actual visible rectangle. For example, it might contain views that were recently visible but have since been scrolled out of the visible rectangle. To test whether a view is actually visible, check to see if its frame rectangle intersects the
visible of the collection view.