         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 {

            
            // 关闭下拉刷新提示
            self.refreshControl?.endRefreshing()
        })
    }
    
    // 接收到通知后的实现方法
    @objc private func titleChange() {

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

