gistfile1.txt

- (void) application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateBackground || (state == UIApplicationStateInactive)) {
        NSDictionary *aps = userInfo[@"aps"];
        if (aps) {
            NSLog(@"Background fetch started...");
            
            NSString *urlString = [NSString stringWithFormat:@"https://www.apple.com/ac/structured-data/images/knowledge_graph_logo.png?201612081039"];
            
            NSURLSession *session = [NSURLSession sharedSession];
            [[session dataTaskWithURL:[NSURL URLWithString:urlString]
                    completionHandler:^(NSData *data,
                                        NSURLResponse *response,
                                        NSError *error) {
                        NSHTTPURLResponse *httpResp = (NSHTTPURLResponse*) response;
                        if (!error && httpResp.statusCode == 200) {
                            completionHandler(UIBackgroundFetchResultNewData);
                            NSLog(@"Background fetch completed...");
                        } else {
                            NSLog(@"%@", error.description);
                            completionHandler(UIBackgroundFetchResultFailed);
                            NSLog(@"Background fetch Failed...");
                        }
                    }
              ] resume
             ];
        }
    } else if (state == UIApplicationStateInactive) {
        // user tapped notification
        completionHandler(UIBackgroundFetchResultNoData);
    } else {
        // app is active
        completionHandler(UIBackgroundFetchResultNoData);
    }
}