Support Retina 4-inch with a deployment target to 4.3

Question

I'm developing an iPhone and iPad app with latest SDK and Xcode 4.5.2.

My client said me that the app has to support iOS 4.3 and above.

So, if I target iOS 4.3 I can't use:

• Storyboards.
• Auto-layouts.

I have to create XIB for every ViewController, but:

What must I do to support Retina 4-inch screen?

and

What must I do something to support iOS 5?

Answer 1

Simply design your app for 3.5" screens, and make judicous use of autoresizing masks.