gistfile1.m

-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler{
     
    // Call or write any code necessary to get new data, process it and update the UI.
     
    // The logic for informing iOS about the fetch results in plain language:
    if (/** NEW DATA EXISTS AND WAS SUCCESSFULLY PROCESSED **/) {
        completionHandler(UIBackgroundFetchResultNewData);
    }
     
    if (/** NO NEW DATA EXISTS **/) {
        completionHandler(UIBackgroundFetchResultNoData);
    }
     
    if (/** ANY ERROR OCCURS **/) {
        completionHandler(UIBackgroundFetchResultFailed);
    }
}