         self.refreshControl?.beginRefreshing()
         
         // 7. 添加刷新提醒
-//        self.navigationController?.navigationBar.insertSubview(tipLabel, atIndex: 0)
+        self.navigationController?.navigationBar.insertSubview(tipLabel, atIndex: 0)
     }
     
     deinit {

    
    /// 刷新提醒
    private lazy var tipLabel: UILabel = {
       let lb = UILabel()
        lb.frame = CGRectMake(0, 0, UIScreen.mainScreen().bounds.size.height, 44)
        lb.text = "没有更多的数据"
        lb.backgroundColor = UIColor.orangeColor()
        lb.textColor = UIColor.whiteColor()
        lb.textAlignment = .Center
        lb.hidden = true
        return lb
    }()


            
            // 关闭下拉刷新提示
            self.refreshControl?.endRefreshing()
            
            //  显示刷新提醒数据
            self.showRefreshStatus(viewModels.count)
        })
    }
    
    // 显示刷新数据提示方法
    private func showRefreshStatus(count: Int) {
        tipLabel.text = count == 0 ? "没有更多数据" : "\(count)条数据"
        tipLabel.hidden = false
        
        UIView.animateWithDuration(0.5, animations: {
            self.tipLabel.transform = CGAffineTransformMakeTranslation(0, 44)
            }) { (bool) in
                UIView.animateWithDuration(0.5, delay: 0.5, options: UIViewAnimationOptions(rawValue: 0), animations: {
                    self.tipLabel.transform = CGAffineTransformIdentity
                    }, completion: { (bool) in
                        self.tipLabel.hidden = true
                })
        }
    }

    
    // 接收到通知后的实现方法
    @objc private func titleChange() {
