//UILabel的使用方法
        let label:UILabel = UILabel(frame: CGRect(x: 0, y: 100, width: view.frame.size.width, height: 100))
        label.text = "人人都爱萌叔老,天天不吃药"
        label.textAlignment = NSTextAlignment.Center
//        label.numberOfLines = 2
        //设置文字过长的显示模式
        label.lineBreakMode = NSLineBreakMode.ByTruncatingMiddle
        //根据文本框范文自动缩放字体,以达到完全显示的目的
        label.adjustsFontSizeToFitWidth = true
        //字体大小 粗体
//        label.font = UIFont.boldSystemFontOfSize(14)
        //正常
        label.font = UIFont.systemFontOfSize(14)
        label.textColor = UIColor.blueColor()
       
        //设置阴影
        label.shadowColor = UIColor.cyanColor()
        label.shadowOffset = CGSizeMake(1.0, 1.0)
       
        //将文本标签加入视图中
        view.addSubview(label)
        // 给label添加点击事件
        label.userInteractionEnabled = true
       
        let tap:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "tap:")
        label.addGestureRecognizer(tap)
    }
   
    func tap(tap : UITapGestureRecognizer){
        print("tihis is click")

    }