Mac OS X NSUserNotificationCenter notification get dismiss event/callback

Question

In our app we are displaying Notification Center notifications in alert style.

Displaying notification works fine, as well as we get callback when user interacts wit

Answer 1

In Swift 2.3:

func userNotificationCenter(center: NSUserNotificationCenter, didDeliverNotification notification: NSUserNotification) {

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) { 
        var notificationStillPresent: Bool
        repeat {
            notificationStillPresent = false
            for nox in NSUserNotificationCenter.defaultUserNotificationCenter().deliveredNotifications {
                if nox.identifier == notification.identifier {
                    notificationStillPresent = true
                    break
                }
            }

            if notificationStillPresent {
                let _ = NSThread.sleepForTimeInterval(0.20)
            }
        } while notificationStillPresent

        dispatch_async(dispatch_get_main_queue()) {
            self.notificationHandlerFor(notification)
        }
    }
}

PS: Please also notice that it is the way to detect the dismiss event, which can be triggered in several cases.

1. Click the otherButton to dismiss
2. Click the Clear All button in Notification Center

PS 2: If you are using deliveryRepeatInterval, say 1 minute, there are multiple notifications in deliveredNotifications array, while only one is displayed. The dismissal shall trigger multiple callbacks.

PS 3: Clicking actionButton will also trigger the dismissal callback