The index path of the collection view cell that previously had the focus.
- iOS 9.1+
- Mac Catalyst 13.0+
- tvOS 9.0+
This property contains an index path only when the view receiving focus belongs to a cell of the collection view. If focus was previously in a view outside of the collection view and its cells, this property is
nil. This property is also
nil when the collection view receives focus for the first time.