Universal iPhone/iPad application

Question

I know, how to detect whether it iPhone or iPad

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 

I know 2 ways to build universal app:

1) use one controller for 2 xibs (iPhone/iPad)

2) use different viewcontrollers for iPad and iPhone

What's the best way to do that?

Answer 1

Same View Controllers for iPhone & iPad, but using UIUserInterfaceIdiom as switch case to avoid duplicated view controllers ( with same contents ) created.

You can use different XIBs for iPhone & iPad though.