How to develop or migrate apps for iPhone 5 screen resolution?

Question

The new iPhone 5 display has a new aspect ratio and a new resolution (640 x 1136 pixels).

What is required to develop new or transition already existing applications

Answer 1

If you need to convert an already existing app to universal, you need to select corresponding xib file->show Utilities-> Show Size inspector.

In Size inspector you can see Autosizing, by using this tool you can convert to existing iOS App.