refresh table view when notification is received

Question

I have a very small chat in my app. whenever a user receives a message, the server sends a notification. In appDelegate I have implemented the code below:

@available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler(.alert)
//        print(UNNotificationAction)
        print("📲📲📲 recieved")
        if notification.request.content.title.contains("Message")
        {
            print("sub")
            print(notification.request.content.subtitle)
            print("body")
            print(notification.request.content.body)
            print("it containt DM ⏰")

            let storyboard:UIStoryboard = UIStoryboard(name:"Chat", bundle: nil)
            let vc = storyboard.instantiateViewController(withIdentifier: "chatRoomVc") as! ChatRoomViewController
            vc.becomeFirstResponder()

            vc.setRefreshListener {
                print("triggered")
            }

        }

    }

and whenever it runs, it calls the API and gets the chat data. the code below shows how it gets the data:

 func setRefreshListener(listener:@escaping ()->Void){
    refreshListener = listener
    presenter.getttingChatRoomData(aptId: UserDefaults.standard.string(forKey: userAPTID)!, id: UserDefaults.standard.string(forKey: userID)!)
    presenter.attachView(view: self)
    super.loadView()
    super.reloadInputViews()
    tableView.reloadData()


}

in addition, I can get the data properly.

THE PROBLEM is it does not reload the data for the table view!!

does anybody has any solution why this is happening?

UPDATE: the code below runs when data is recieved:

 func gettingUserChatWithSUCCESS(responce: [chatRomModel]) {
        print("✅ getting chat room data SUCCESS")
        data = responce
        tableView.reloadData()
    }

Answer 1

You can solve this issue using notification observer, Like follow this code.

Add notification observer in your viewcontroller

NotificationCenter.default.addObserver(self, selector: #selector(onReceiveData(_:)), name: "ReceiveData", object: nil)

@objc func onReceiveData(_ notification:Notification) {
    // Do something now //reload tableview
}

call observer using this code in your appDelegate.swift file receive notification method

NotificationCenter.default.post(name: Notification.Name("ReceiveData"), object: nil)

Note:- Remove notification observer when your viewcontrller will Disappear, using this code

override func viewWillDisappear(_ animated: Bool) {
      super.viewWillDisappear(animated)
      NotificationCenter.default.removeObserver(self, name: "ReceiveData", object: nil)
}

Answer 2

Implement UNUserNotificationCenterDelegate method and post your notification.

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

    let userInfo = response.notification.request.content.userInfo
    if UIApplication.shared.applicationState == .background || UIApplication.shared.applicationState == .inactive {
                NotificationCenter.default.post(name: .newMessage, object: nil, userInfo:userInfo)
     }

}

In your view controller add an observer to check on notifications ( Add your own selector method.)

  NotificationCenter.default.addObserver(self,
                                        selector: #selector(updateMessages(notification:)),
                                        name: .newMessage,
                                        object: nil)



    @objc func updateMessages(notification: NSNotification) {
     // Handle your notifications...
   }