取消UITableViewCell的背景色

 //无色
 cell.selectionStyle = UITableViewCellSelectionStyleNone;
 //蓝色，也就是系统默认的颜色
 cell.selectionStyle = UITableViewCellSelectionStyleBlue;
 //灰色
 cell.selectionStyle = UITableViewCellSelectionStyleGrap;

 //自定义选中的背景色 通过RGB来定义颜色
 UIColor* color = [[UIColor alloc]initWithRed:0.0 green:0.0 blue:0.0 alpha:];
 cell.selectedBackgroundView = [[UIView alloc]initWithFrame:cell.frame]autorelease];
 cell.selectedBackgroundView.backgroundColor = [UIColor redColor];

 //自定义选中后的背景图片
 cell.selectedBackgroundView = [[[UIImageView alloc]initWithImage:
   [UIImage imageNamed:@"image.png"]]autorelease];
 //设置UITableViewCell中的字体颜色时用
 cell.textLabel.highlightedTextColor = [UIColor **color];