TranslateFrom a Swift Version at https://github.com/dudongge/DDGScreenShot
This Project is an OC version that been translated from a Swift version at above which can be used to ScreenShot UIVIEW WEBVIEW and SCROLLVIEW.
此项目是关于截屏的OC版本，原为SWift 版本，可以用作UIVEW WEBVIEW SCROLLVIEW的截屏功能。
almost copy the whole codes. 基本上完整的copy过来了。
code mat is not very good look. 代码排版不怎么整齐。