Type Property

default

The app’s default notification center.

Declaration

class var `default`: NotificationCenter { get }

Discussion

All system notifications sent to an app are posted to the default notification center. You can also post your own notifications there.

If your app uses notifications extensively, you may want to create and post to your own notification centers rather than posting only to the default notification center. When a notification is posted to a notification center, the notification center scans through the list of registered observers, which may slow down your app. By organizing notifications functionally around one or more notification centers, less work is done each time a notification is posted, which can improve performance throughout your app.

See Also

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

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