Restores the state needed to continue the given user activity.
- iOS 8.0+
- tvOS 9.0+
The user activity to be continued.
Subclasses override this method to restore the responder’s state with the given user activity. The system calls it on any objects passed to the restoration handler given to
application(_:. The override should use the state data contained in the given user activity’s
user dictionary to restore the object.
You may also call this method directly if the app delegate chooses not to use the restoration handler.