The question is how to tell system which UI (images , custom buttons, and so on) to show (i must to have some copies with a lower resolution and other copies with better resolution ), because iphone 3gs has a lower resolutin than iphone 4. UI of app should look greate on both devices. How can i get that ?
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Read the Resource Programming Guide section called Specifying High-Resolution Images in iOS in the Image, Sound, and Video Resources chapter.