iOS typography reference or programming guide? [closed]

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I haven't found any documentation from Apple on typography in iOS.

Is there any good book or resource on this topic somewhere you would recommend?

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I think you might be looking for the CoreText framework:

http://developer.apple.com/library/ios/#documentation/StringsTextFonts/Conceptual/CoreText_Programming/Introduction/Introduction.html

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Here's a reference to the available fonts on ios: http://iosfonts.com/

EDIT:

I haven't used this myself but might be helpful: http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_text/dq_text.html