iOS: image with 2x

其中<device_modifIEr>是optional的，它可以是"~ipad" or "~iphone"

当你使用下列代码时：

[button setimage:[UIImage imagenamed:@"play.png"] forState:UIControlStatenormal];

ref links:

http://developer.apple.com/library/ios/#documentation/2DDrawing/Conceptual/DrawingPrintingiOS/SupportingHiResScreens/SupportingHiResScreens.html#//apple_ref/doc/uid/TP40010156-CH15-SW8

http://stackoverflow.com/questions/3442239/retina-icons-2x-arent-being-used-when-images-are-specified-in-code

http://stackoverflow.com/questions/9770990/uiimage-imagenamed-not-work-on-ios-5-0

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