标签：blog io sp on div log bs ef as
UIView的drawRect方法中：
UIGraphicsGetCurrentContext();
创建画布，获得context。最常用的imageContext：
UIGraphicsBeginImageContextWithOptions(annoImage.size, NO, 0.0); CGContextRef context = UIGraphicsGetCurrentContext();
标签：blog io sp on div log bs ef as
原文地址：http://www.cnblogs.com/zhongriqianqian/p/4134306.html
