iOS Push Notification Action is not showing up

Question

My app has a connection to the Firebase-server, also to send Push Notifications. Now, I want to go a step further and add an action to the notifications. After going throw lots of tutorials, it´s still not working for me. The action-button is not showing up, as you can see here:

Here is my code:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    UIApplication.shared.applicationIconBadgeNumber = 0
    FirebaseApp.configure()
    registerForPushNotifications()
    return true
}

func registerForPushNotifications() {
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
        (granted, error) in
        print("Permission granted: \(granted)")

        guard granted else { return }

        let viewAction = UNNotificationAction(identifier: "addToCal",
                                              title: "Zum Kalender hinzufügen",
                                              options: [.foreground])

        let newsCategory = UNNotificationCategory(identifier: "NEW_SESSION",
                                                  actions: [viewAction],
                                                  intentIdentifiers: [],
                                                  options: [])
        UNUserNotificationCenter.current().setNotificationCategories([newsCategory])
        self.getNotificationSettings()
    }
}

func getNotificationSettings() {
    UNUserNotificationCenter.current().getNotificationSettings { (settings) in
        print("Notification settings: \(settings)")
        guard settings.authorizationStatus == .authorized else { return }
        DispatchQueue.main.async {
            UIApplication.shared.registerForRemoteNotifications()
        }
    }
}

As I saw at this tutorial, I also added the "category" key with the value "NEW_SESSION" to the push notification I´m sending, but it´s not working as well.

Update: I noticed that the "category" key is passed through the notification, so its just a question to handle it right. The userInfo Dictionary looks like this:

{ "aps" : { 
"alert" : { 
"body" : "This notification has no action", 
"title" : "Test", 
} 
}, 
"category" : "NEW_SESSION" 
} 

Answer 1

For me it works when I have the "category" included in "aps" dictionary and it does not work when I have it outside of "aps". And also, did you guys noticed that in the payload that Devhess posted as an update to his question the "category" field is misspelled. So instead of "category" we have "catogary" there. This also could be the problem. This payload works for me:

{ "aps":{ "alert":{ "body":"This notification has ACTIONS", "title":"ACTIONABLE Notification title" }, "badge":1, "sound":"default", "category":"NEW_SESSION" } }

Answer 2

The buttons do not appear on their own. On supported devices you have to 3D touch the notifications to show the content or buttons. On non-supported devices you can try swiping down or left/right for the buttons to show.

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
            (granted, error) in
            print("Permission granted: \(granted)")

            guard granted else { return }

            let action = UNNotificationAction(identifier: "addToCal", title: "Zum Kalender hinzufügen", options: [])
            let category = UNNotificationCategory(identifier: "NEW_SESSION", actions: [action], intentIdentifiers: [], options: [])
            UNUserNotificationCenter.current().setNotificationCategories([category])

            self.getNotificationSettings()
        }

And add UNUserNotificationCenterDelegate methods to handle action.

@available(iOS 10, *)
extension AppDelegate : UNUserNotificationCenterDelegate {

    // Receive displayed notifications for iOS 10 devices.
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        // Print message ID.
        // Print full message.
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        if response.actionIdentifier == "addToCal" {

            //Handel action.
        }
    }
}

And don't forgot to set delegate as:

UNUserNotificationCenter.current().delegate = self

Payload format

{
    "aps" : {
              "category" : "NEW_MESSAGE_CATEGORY",
               "alert" : {
                        "body" : "Acme message received from Johnny Appleseed",
                        "title" : "Test",
                    },
               "badge" : 3,
             },
}