Continue getting data in background mode

Question

I am getting data from server and show percentage to user. But when I click to phone home button (I mean my app in background mode. Not kill it) process stops. When I open app again it is continue. What should I do to continue getting data in background mode?

Answer 1

You can use the below function, it will let your operation run in the background for 2-3 minutes.

  var aBackgroundTask: UIBackgroundTaskIdentifier = UIBackgroundTaskIdentifier.invalid


func registerBackgroundTask() {
        aBackgroundTask = UIApplication.shared.beginBackgroundTask { [weak self] in
              self?.endBackgroundTask()
        }
        assert(callLoggingBackgroundTask != UIBackgroundTaskIdentifier.invalid)
    }


func endBackgroundTask() {
    print("Background task ended.")
    UIApplication.shared.endBackgroundTask(convertToUIBackgroundTaskIdentifier(callLoggingBackgroundTask.rawValue))
    aBackgroundTask = UIBackgroundTaskIdentifier.invalid
}

Call function registerBackgroundTask() when operation starts and call this function endBackgroundTask() when operation finishes.