CGContextRef用法
http://blog.csdn.net/wmqi10/article/details/8730352
iOS重繪機(jī)制drawRect
http://blog.csdn.net/fww330666557/article/details/8647608
iOS CGContextRef畫圖小結(jié)
http://blog.sina.com.cn/s/blog_9693f61a0101deko.html
iOS使用CGContextRef繪制各種圖形
http://www.devstore.cn/essay/essayInfo/116.html
iOS用CGContextRef畫各種圖形(文字讨韭、圓、直線、弧線透硝、矩形狰闪、扇形、橢圓濒生、三角形埋泵、圓角矩形、貝塞爾曲線罪治、圖片)
http://blog.csdn.net/rhljiayou/article/details/9919713
CGContextDrawImage畫圖圖形相反鏡像
http://blog.csdn.net/koupoo/article/details/8670024
drawRect:和- (void)setNeedsDisplay的一些理解
http://www.cnblogs.com/pengyingh/articles/2383688.html
iOS畫圖以及清空
http://blog.csdn.net/woshidaniu/article/details/46683409
drawRect自動(dòng)清除屏幕
http://www.cocoachina.com/bbs/read.php?tid=7085
drawRect中丽声，如何清除之前所繪制的內(nèi)容
http://www.cocoachina.com/bbs/read.php?tid=28302&page=e&#a
drawRect中，如何清除之前所繪制的內(nèi)容
