I`m new at iOS development. I have seen that the new iPad 3 have an 1536×2048 resolution. And I asked from my designer that all the design should be in that resolution, but now i see that i have to resize every image, button and background to fit xcodes story board. How in xcode i can set the development resolution to 1536*2048?
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You don’t. Xcode uses points to reference pixels and automatically uses the correct graphics depending on the device. You have to make two copies of your image, “image” and “image@2x”.
You do all of your development with “image” and iOS will automatically use the @2x version if the device is retina.