actionIdentifier
The identifier string of the action that the user selected.
Declaration
var actionIdentifier: String { get }Mentioned in
Discussion
This parameter may contain one the identifier of one of your UNNotificationAction objects or it may contain a system-defined identifier. The system defined identifiers are UNNotificationDefaultActionIdentifier and UNNotificationDismissActionIdentifier, which indicate that the user opened the app or dismissed the notification without any further actions.
For more information about defining custom actions, see Declaring your actionable notification types.