Instance Method


Tells the delegate that the app successfully registered with Apple Push Notification service (APNs).


optional func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)



The app object that initiated the remote-notification registration process.


A token that identifies the device to APNs. The token is an opaque data type because that is the form that the provider needs to submit to the APNs servers when it sends a notification to a device. The APNs servers require a binary format for performance reasons.

APNs device tokens are of variable length. Do not hard-code their size.

Note that the device token is different from the uniqueIdentifier property of UIDevice because, for security and privacy reasons, it must change when the device is wiped.


After you call the registerForRemoteNotifications() method of the UIApplication object, the app calls this method when device registration completes successfully. In your implementation of this method, connect with your push notification server and give the token to it. APNs pushes notifications only to the device represented by the token.

The app might call this method in other rare circumstances, such as when the user launches an app after having restored a device from data that is not the device’s backup data. In this exceptional case, the app won’t know the new device’s token until the user launches it.

For more information about how to implement remote notifications in your app, see Local and Remote Notification Programming Guide.

See Also

Handling Remote Notification Registration

func application(UIApplication, didFailToRegisterForRemoteNotificationsWithError: Error)

Sent to the delegate when Apple Push Notification service cannot successfully complete the registration process.