What is the recommended method of styling an iOS app?

Question

What is the recommended method of styling an iOS app? For example, if there are multiple labels or text views how can updating font style/color at one place update the style

Answer 1

I use plists. Just as I localize strings, I use the same procedure to change themes. I coded a singleton that loads a current theme plist and a fallback plist. Then I replace the names of resources with keys and macro functions that pull the real resource name from the singleton.

Cons: you have to set the resource for each element, not just set it in the NIB.
Pros: once you are done, most of the next theme involves photoshop and textmate, not IB or code.