Objc: Alternate the background color of a UITableViewCell.

gistfile1.m

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row % 2 == 0) {
        UIColor *altCellColor = [UIColor colorWithWhite:0.7 alpha:0.1];
        cell.backgroundColor = altCellColor;
    }
}