But I have found nothing similar to this one for iphone with retina display
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If you’re designing your own interface elements and need image dimensions, yes; you just double the values. However, in your code, when referring to the coordinate system of elements (points), you still use then 320×480 point system, as the points are automatically scaled for different device resolutions.
For images, the retina sized images must have the same file name, but with @2x following. For instance, background.png (320×480) must have a similar image background@2x.png with dimensions 640×960.