How to set an image based on iphone platform in objective-c -

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i'm moving application 3.x 4.x prepare app store , found need have 2 copies of custom pngs - question how can determine img show , when. example - how know show find.png vs find@2x.png

is "safe" or "correct" 4.x specific apis or iphone have way determine platform on @ runtime?

thank in advance

when use standard apis, phone handles grabbing @2x version when necessary. example if use [uiimage imagenamed:@"find.png"]; , run on iphone 4, load find@2x.png automatically.


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