The identifier of the app-defined category object.
- iOS 10.0+
- macOS 10.14+
- UIKit for Mac 13.0+Beta
- watchOS 3.0+
Use notification types to distinguish between the different types of notifications your app supports. You use this support primarily to create actionable notifications—that is, notifications with custom action buttons—and to redirect your notifications through either your notification service app extension or your notification content app extension.
For remote notifications, this property is set to the value of the
category key in the