Replaces the layout manager for the group of text system objects containing the receiver.
- iOS 9.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
The new layout manager.
All text containers and text views attached to the old layout manager are reassigned to the new layout manager. Unlike setting the
layout property directly, this method makes all the adjustments necessary to keep the text object relationships intact.