Are storyboards going to work on ios 4?

Storyboards are new features in xcode 4.2 which simplify navigation design.

I assume new apps using storyboards are going to be working just fine on iOS 5 when it ships but I haven't seen anything about storyboards compatibility with iOS 4.

It makes sense that they would work (just like ARC is supposed to be going to work - they are a compiler / IDE feature, not runtime features AFAI开发者_开发知识库K) but that's just me guessing, does anyone know if it's safe to use storyboards and be able to ship for iOS 4?

thanks!

Storyboards themselves are NDAd. But no, storyboards are absolutely not compatible with iOS4, the rely on new runtime classes which are not available there.