WWDC 2012 announced features on iOS 5?

Posted by Arnold Sakhnov on Programmers See other posts from Programmers or by Arnold Sakhnov
Published on 2012-07-07T00:22:53Z Indexed on 2012/07/07 3:22 UTC
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iphone

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ios

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objective-c

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SDK

I am relatively new to iOS development, so after watching a bunch of WWDC videos announcing new awesome features for the iPhone SDK, I still got a few questions regarding their support for older devices. Specifically:

Do the new compiler features (such as literals support, auto-synthesize, etc) require iOS 6 on the target device, or can the new style code be deployed to iOS 5 devices?
Auto-layout for iOS, same question. Will it only be supported on iOS 6, or 5 as well? If it's 6 only, what kind of fallback are we expected to implement?

Would really appreciate if someone could clarify this for me, as I'm thinking about rewriting my older unfinished project and I would love to use some of that improved SDK functionality.

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