A trigger condition that indicates the notification was sent from Apple Push Notification Service (APNs).
- iOS 10.0+
- macOS 10.14+Beta
- tvOS 10.0+
- watchOS 3.0+
You don't create instances of this class yourself. The system creates
UNPush objects and associates them with requests that originated from Apple Push Notification service. You encounter instances of this class when managing your app’s delivered notification requests, which store an object of this type in their