Dynamically change UIView for UITableView section header

gistfile1.txt

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 40, 13)];
    label.textColor = [UIColor blueColor];
    label.text = [NSString stringWithFormat:@"%d", section];
    label.tag = 100 + section;
    return label;
}

/*
// This is not getting called
-(void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
    UILabel *label = (UILabel *)view;
    label.textColor = [UIColor redColor];
}
*/

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    
    NSArray *visible = [self.tableView indexPathsForVisibleRows];
    
    
    
    [visible enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        
        UIView *view = [self.tableView viewWithTag:100+ ((NSIndexPath *)obj).section];
        
        if ([view respondsToSelector:@selector(setTextColor:)])
        {
            [(UILabel *)view setTextColor:[UIColor blueColor]];
        }
    }];
    
    NSIndexPath *indexPath = (NSIndexPath*)[visible objectAtIndex:0];
    NSLog(@"indexPath section: %d row: %d", indexPath.section, indexPath.section);
    
    UIView *view = [self.tableView viewWithTag:100+indexPath.section];
    
    if ([view respondsToSelector:@selector(setTextColor:)])
    {
        [(UILabel *)view setTextColor:[UIColor redColor]];
    }
}