A Boolean indicating whether to recompute the size of items and views in the layout.
- iOS 7.0+
- tvOS 9.0+
The default value of this property is
NO. Set this property to
YES if you are invalidating the layout because of changes to the size of any items.
When this property is set to
YES, the flow layout object recomputes the size of its items and views, querying the delegate object as needed for that information.