let lable1 = UILabel(frame: CGRect(x: CGFloat(self.view.bounds.width/2-20), y: CGFloat(history.frame.origin.x + 12), width: 390.0, height: 24.0))

        lable1.adjustsFontSizeToFitWidth = true

        lable1.text = "课程"

        lable1.font = UIFont.systemFontOfSize(19.0)   //设置字体大小

        self.view.addSubview(lable1)