How do I respond to a tap on a UNUserNotification?

Question

I'm using the new UNUserNotification framework in iOS 10. I can see how to add action buttons, but how do I respond when the user taps the notification itself? In my case, it will be an image with some text.

The default behavior is that the application opens.

1. Can I have custom code that detects if my application is being opened because of a UNUserNotification tap, and ideally with identifier information about the notification tapped?

2. Will these work if my app is running in the background or closed? UNUserNotification documentation suggests setting the delegate of UNUserNotificationCenter, but I think this only works if the app is running.

Answer 1

Set AppDelegate to be UNUserNotificationCenterDelegate if you haven't already and add the following to the didReceive method:

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    let userInfo = ["identifier":response.notification.request.identifier]
    NotificationCenter.default.post(name: Notification.Name(rawValue: "userNotificationCenterDidReceiveResponse"), object: self, userInfo: userInfo)

    completionHandler()
}

You can then register for that "userNotificationCenterDidReceiveResponse" notification and do whatever you like with the identifier. This works no matter what state your app is in, including not running.

If this isn't clear enough I can upload a sample project.

Answer 2

Use UNUserNotificationCenter Delegates.

Use this when app is in foreground:

- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler

get the values to use from notification

And this when app is in the background:

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)())completionHandler

get the values to use from response.

Hope this will help.