gistfile1.m

- (IBAction)JSONLoader:(id)sender
{
    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    [spinner startAnimating];
    
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:spinner];
    
    [self refreshServers];
    
    self.navigationItem.leftBarButtonItem = sender;
}

- (void)refreshServers
{
    dispatch_queue_t parsingQueue = dispatch_queue_create("JSONData", NULL);;
    dispatch_async(parsingQueue, ^{
        
        dispatch_async(dispatch_get_main_queue(), ^{

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://old.hungercraft.net/serverlist.php"]];
    
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
        
        NSArray *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        
        _dataJSON = [json copy];
        
        [_tableView reloadData];
        
        }];
        
        });
    });
    dispatch_release(parsingQueue);
}