比较容易掌握的视图控件类，样例中仅仅做了正弦函数的图像，在此基础上可以改写成其它波形，愿我们一起提高，共同进步。-Relatively easy to grasp control of the view class, sample only the sine function to do the graphics, on this basis can be rewritten into other waveforms, is willing to enhance our work togethe