gistfile1.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"SampleTable";
	
	if (!tweetMessages) {
		UITableViewCell *cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
		cell.textLabel.text = @"loading...";
		cell.textLabel.textColor = [UIColor grayColor];
		return cell;
	}
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }
	cell.textLabel.text = [tweetMessages objectAtIndex:[indexPath row]];
	cell.textLabel.adjustsFontSizeToFitWidth = YES;
	cell.textLabel.numberOfLines = 3;
	cell.textLabel.font = [UIFont boldSystemFontOfSize:12];
	cell.textLabel.textColor = [UIColor darkGrayColor];

	if (dispatch_queue_create != NULL) {
		cell.imageView.image = [UIImage imageNamed:@"blank.png"];
		dispatch_async(image_queue, ^{
			UIImage *icon = [self getImage:[tweetIconURLs objectAtIndex:[indexPath row]]];
			dispatch_async(main_queue, ^{
				UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
				cell.imageView.image = icon;
			});
		});
	} else {
		cell.imageView.image = [self getImage:[tweetIconURLs objectAtIndex:[indexPath row]]];
	}

    return cell;
}