[Interest] background uploads in iOS

[Jason H]

I was reading on how I can do background uploads and it seems as os iOS 7, there is a facility to do this. 
( https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSURLSession_class/index.html )
( https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW22 )

I also know what Qt has to use the iOS networking APIs, and was wondering if this is already supported in some degree? I was thinking I could use: UIBackgroundModes: fetch to post the content? I found this page
( http://hayageek.com/ios-background-fetch/ ) that says I need to call a completion handler, but I am unsure as to where I add this in a QML app?

Many thanks in advance