response-navigating.swift

   func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
      // 1. Access the payload notification content once received
      if let apnsData = response.notification.request.content.userInfo["aps"] as? [String: Any] {
            // 2. Get the imaginary storeID from the payload
            if let storeID = apnsData["storeID"] as? Int,
                // 3. When a notification is received and your app opens up you would generally get the initial View Controller
                // You can then access the InitialViewController and parse the it, and you can then access its functions. 
                let initialVC =  self.window?.visibleViewController as? InitialViewController {
                // 4. Using the initialVC function for getting a StoreViewController by a given storeID.
                // The getStoreViewController could simply perform a segue programatically and navigate from the InitialViewController to the StoreViewController
                initialVC.getStoreViewController(by: storeID)
            }
            completionHandler()
        }
    }