UNNotificationDismissActionIdentifier
The action that indicates the user explicitly dismissed the notification interface.
Declaration
let UNNotificationDismissActionIdentifier: StringDiscussion
The system delivers this action only if your app configured the notification’s category object with the customDismissAction option. To trigger this action, the user must explicitly dismiss the notification interface. For example, the user must tap the Dismiss button or swipe down on the notification interface in watchOS to trigger this action.
Ignoring a notification or flicking away a notification banner doesn’t trigger this action.