Do you draw your iOS UI (1) in code or (2) in Photoshop/Illustrator, and why?

(1) By overriding drawRect for example, which I assume would be more flexible in term of scaling and dynamic customization.

(2) By drawing assets in Photoshop/Illustrator and importing them in a catalog, which I assume would give more control over the quality of the assets.<p>From that, I am guessing that it depend on the use case. However, are there any of you who prefer a method over another, in general, and why?

For DN users: https://news.layervault.com/stories/12137-ask-dn-do-you-draw-your-ios-ui--1-in-code-or-2-in-photoshopillustrator-and-why