Вызов API действенного уведомления не работает в фоновом режиме ⇐ IOS

[Anonymous]

Я пытаюсь загрузить файл при нажатии кнопки уведомления, но когда приложение находится в фоновом режиме, вызов API не работает.
Код уведомления:
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo as! [String: AnyObject]

switch response.actionIdentifier {
case "DownloadDutyPlanAction":
print("Download tap")
downloadDutyPlanFromNotification(fetchCompletionHandler: nil)
completionHandler()

case "CancelAction":
print("Cancel tap")

default:
completionHandler()
}


func downloadFromNotification(fetchCompletionHandler completionHandler: ((UIBackgroundFetchResult) -> Void)?) {
let downloadPDFOperation = PDFDownloadOperation.init() { result in
switch result {
case .success:
DispatchQueue.main.async {

}

completionHandler?(UIBackgroundFetchResult.newData)
case .failure:

completionHandler?(UIBackgroundFetchResult.newData)
}
}
QueueManager.shared.enqueueNotification(downloadPDFOperation)
}

Класс сети:
private var task: URLSessionTask?
private var session = URLSession.init(configuration: URLSessionConfiguration.default, delegate: NSURLSessionPinningDelegate(), delegateQueue: nil)

func request(forDownloadUrl route: EndPoint, completion: @escaping NetworkDownloadRouterCompletion) {

do {
let request = try self.buildRequest(from: route)
task = session.downloadTask(with: request) { localURL, response, error in
if let tempLocation = localURL {
completion(response, error, tempLocation)
} else {
completion(response, error, nil)
}
}
} catch {
completion(nil, error, nil)
}
self.task?.resume()
}


Подробнее здесь: https://stackoverflow.com/questions/782 ... background