swift ios 8 change font title of section in a tableview

override func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int)
{
    let header = view as! UITableViewHeaderFooterView
    header.textLabel?.font = UIFont(name: "Futura", size: 38)!
    header.textLabel?.textColor = UIColor.lightGrayColor()
}