Matt Gemmell sepsal pravidla, která doporučuje pro tvorbu API komponent na iOS. Jedná se o těchto 25 pravidel (podrobně je najdete vysvětlená v Mattově článku):

1. Use the local dialect
2. Design decoupled
3. Required settings should be initializer parameters
4. Allow access to initializer parameters
5. Comment your header files (including defaults)
6. Get up and running in 3 lines
7. A fat demo usually means a broken component
8. Anticipate customisation scenarios
9. More properties, fewer actions
10. Use controls in your controls
11. Convenient for you is convenient for me
12. Magic is OK. Numbers aren’t.
13. Limit ‘required’ delegate methods
14. Design for accessibility
15. Use semantic objects for parameters
16. Enhance the API if semantics don’t fit
17. Highlighting is interesting
18. Optional methods aren’t a commitment
19. Always say who’s talking
20. Put distinguishing params first in query methods
21. Put the sender first in notification methods
22. If a convention is broken, throw it away
23. Notifications follow delegate methods
24. Be generous with notifications’ userInfo
25. Test the hell out of it