When does NSURLSession run?

Question

I have a situation in which when the device receives a push notification, I would send a NSURLSession combined with a NSURLConnection. I have a couple

Answer 1

If you use background configurations with NSURLSession the delegates are getting called on success/failure when your app is Active or in the background. The task you created are handed over to a demon of the OS and your app is being waken up or even started (if it killed by iOS) using

`application:handleEventsForBackgroundURLSession:completionHandler`:

And when all the tasks completed your session delegate would be called with

URLSessionDidFinishEventsForBackgroundURLSession:   

More details on background session are here

You can also get apple sample code here and look for "Simple Background Transfer"