From http://stackoverflow.com/questions/9745180/how-to-set-width-of-uitableview-header-view

headerview

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 30, 60)];
    headerView.backgroundColor = [UIColor clearColor];

    UIView *label = [[UIView alloc] initWithFrame: CGRectMake(0,0, 50, 50)];
    label.backgroundColor = [UIColor yellowColor];
    label.autoresizingMask = UIViewAutoresizingFlexibleRightMargin;

    [headerView addSubview:label];
    return headerView;
}