Continue webservice call after transition from foreground to background in iOS objective C -

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suppose call webservice when app in foreground. if user sends app background how make sure webservice call keeps executing in background.

this piece of code using in app.

login* login = [[login alloc]init]; [login initiatesigninprocess];

initiatesigninprocess has 4 web service calls. normal functions. using afnetworking.

if of services fail, call again delay in failure block of afnetworking code below:-

failure:^(afhttprequestoperation *operation, nserror *error)          { [self performselector:@selector(getuserid)  withobject:nil afterdelay:5]; }

now want know if user sends app background, how code execute? call function in bakcground till succeeds?

best use background process fetch. here great tutorial solution [ http://code.tutsplus.com/tutorials/ios-7-sdk-working-with-background-fetch--mobile-20520


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