判断是否为 retina屏幕 

#define IS_RETINA ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)] && ([UIScreen mainScreen].scale == 2.0))


posted @ 2014-07-18 09:38  沙影无痕  阅读(289)  评论(0)    收藏  举报