Specifies what caused a user notification to occur.
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@property(readonly) NSUserNotificationActivationType activationType;
This property specifies why the user notification was sent to to the NSUserNotificationCenterDelegate method userNotificationCenter:didActivateNotification:. The supported values are described in NSUserNotificationActivationType.
An additional action selected by the user.
The actions that can be taken on a notification in addition to the default action.