A Boolean value indicating whether the current device supports notification content extensions.
- iOS 10.0+
- macOS 10.14+
- tvOS 10.0+
- watchOS 3.0+
Notification content extensions let you customize the appearance of the alerts displayed for your app's notifications. The value of this property is
true for devices that support notification content extensions and
false for devices that do not support them. For information about how to implement a notification content extension, see Customizing the Appearance of Notifications.