How to retrieve SVG image from UIview and save it into local directory?

I am new in SVG Image usage. I used svg image in iOS. I get CAShapeLayer, to change color of different part of SVG Image. But i want to save Svg image locally with modified layers. This is my code. Please review it.

I am using this demo program for color filling in Svg image,But i dont know how to save filled image as Svg for further use. 