Notification Service Extension Not working

Question

Notification is not being displayed when I send mutable-content:1 with push payload neither it hits the breakpoint inside the Notification service extension, although without mutable-content push is being displayed, also Notification content extension is working fine. I did not modify the code inside the Notification service extension it's the default generated by the Xcode. Am I missing something while creating a notification service extension or it might be the issue with the device setting? I have tested on the same device a few days ago and the notification service extension was working fine.

Below is my code for service extension

import UserNotifications

class NotificationService: UNNotificationServiceExtension {

    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.contentHandler = contentHandler
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)

        if let bestAttemptContent = bestAttemptContent {
            // Modify the notification content here...
            bestAttemptContent.title = "\(bestAttemptContent.title) [modified]"
    
           contentHandler(bestAttemptContent)
        }
    }

    override func serviceExtensionTimeWillExpire() {
        // Called just before the extension will be terminated by the system.
        // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
            contentHandler(bestAttemptContent)
        }
    }
}

edit 1: below is my push payload

{  
   "aps":{  
      "sound":"default",
      "mutable-content": 1,
      "category": "myCategory",
      "alert":{  
         "body":"this is a custom push",
         "subtitle":"subtitle of the push",
         "title":"Push Test"
      }
      
   }
}

edit1: The problem seems on that particular device running on 10.2.1, I checked with other device running on 10.2, it was triggering the Notification service extension.

Answer 1

Finally I was able to resolve the issue. I am not sure what was causing the issue but after some experiments I realised that not only my service extension but all other installed app's service extension was not working and when sending the push payload with "mutable-content: 1, Notification was not displayed. After rebooting the device it started working fine. I was using iPhone 6s.

Answer 2

Deployment target of your NotificationServiceExtension can also be a reason.

In my case, I was testing on Device running on iOS 12.4 while target version of my NotificationServiceExtension was 14.1. I Just changed my NotificationServiceExtension targeted version to 12.4 it Worked.

Answer 3

In my case it ended up being my extension using too much memory. Console.app was only showing that Springboard was killing the app with an error like:

CMSessionMgr- CMSessionMgrHandleApplicationStateChange: CMSession: Sending stop command to _ with pid '_' because client is not allowed to play in the background AND does not continue AirPlaying video when device locks

I thought something was wrong with the entitlements or something like that, but once I debugged it I saw that it was iOS killing the process for taking too much memory. Once I fixed that bug, the extension was kept alive until I called the callback.

Answer 4

In my case I removed extension and add again. Then restart device..

Answer 5

In my case, when I was debugging, the notification service extension was not getting launched by the system when it received a notification with the mutable content payload. I tried a lot and then figured out that in the run script, the Copy only when installing was checked. I unchecked it and I was able to debug the extensions.

Answer 6

May not relate to the general issue if it exists, but I've spent a whole day trying to figure out why AppMetrica Push SDK campaign pushes won't come in TestFlight but come successfully when running from Xcode. For me it was "push environment" not being set to "production", but for "development":

in func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) had to change it to:

let pushEnvironment = YMPYandexMetricaPushEnvironment.production
YMPYandexMetricaPush.setDeviceTokenFrom(deviceToken, pushEnvironment: pushEnvironment)