The NSDistributedNotificationCenter class provides a way to send notifications to objects in other tasks.
The NSDistributedNotificationCenter class provides a way to send notifications to objects in other tasks. It takes NSNotification objects and broadcasts them to any objects in other tasks that have registered for the notification with their task’s default distributed notification center.
The NSDistributedNotificationCenter class implements a notification center that can distribute notifications asynchronously to tasks other than the one in which the notification was posted. An instance of this class are known as a distributed notification center.