自定义viewForHeaderInSection、自定义组头的显示

如何更改UITableView的section 头部（各分组头部）显示呢？

//自定义viewForHeaderInSection
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView *viewSection = [[[UIView alloc] initWithFrame:CGRectMake(10, 10, 100, 20)];
UILabel *textSection = [[UILabel alloc] initWithFrame:CGRectMake(10,2, 40, 20)];
textSection.text = @"A";
textSection.textColor =[UIColor redColor];
textSection.backgroundColor = [UIColor clearColor];
textSection.font = [UIFont systemFontOfSize:20.0f];
[viewSection addSubview:textSection];
[textSection release];
return ［viewSection autorelease］;
}