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These guidelines describe how to design apps that follow the official HIG for i OS by Apple, not what you can do with custom controls. The purpose of this document is to guide you, not to provide solutions for complex and unique design problems.
If you need the value in pixels, just multiply by 2 for Retina screens or by 3 for Retina HD screens.
Designing i OS apps can be difficult sometimes, but finding correct and up-to-date information about all of Apples’ devices shouldn’t be.
These design guidelines will help any designer who’s building neat things for i OS get started within seconds.
When you are designing for various display types, you should think in points, but design in pixels.
This means you will still need to export all your assets in 3 different resolutions, no matter in which resolution you are designing your app.