 
     override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
         let headLabel = UILabel(frame: CGRectMake(0,0,SCREEN_RECT().width,15))
+        headLabel.backgroundColor = UIColor.lightGrayColor()
         switch section{
         case 0:
             headLabel.text = "邀请好友"

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "添加好友"
        tableView = UITableView(frame: CGRectZero, style: UITableViewStyle.Grouped)
        tableView.sectionHeaderHeight = 15
        tableView.sectionFooterHeight = 0
        tableView.contentInset = UIEdgeInsetsMake(-20, 0, 0, 0)
        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "取消", style: UIBarButtonItemStyle.Plain, target: self, action: "cancel")
        navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(named: "map_icon_zoom_out"), style: UIBarButtonItemStyle.Plain, target: self, action: "searchFriend")
    }

    }

}

extension AddFriendController{

