矢量绘图工具，自动生成CG代码

1、PaintCode 

http://www.paintcodeapp.com/

PaintCode is a vector drawing app that generates Objective-C code in real time.

2、opacity

http://likethought.com/opacity/

Opacity is an easy to use program for drawing graphics for the screen. It's great for making resolution independent images and icons for applications and the web.

3、DrawScript

是一款Adobe Illustrator插件，你在Illustrator中绘制自己想要生成的图案，DrawScript会实时生成相应的iOS代码。这样，你在drawRect函数中就只要粘贴拷贝就能生成自己想要的图案。Drawscript也支持导出为JavaScript、 Processing等多种语言格式。如果你用Illustrator的话，绝对值得一试。 DrawScript目前完全免费、开源。 http://drawscri.pt/