iOS 5.1 with Xcode 4.2 and retina in iPad 3

Question

i have a Mac with Mac OS X Snow Leopard, can i add iOS 5.1 to it?

With the new resolution for iPad 3, how we will do with images, because if the app will run in iPho

Answer 1

You will need 4 resolutions most likely for some items and 2 for others.

1- iPhone 2- iPhone Retina (@2x.png files)

You only need these if you're scaling up the resolution if the old graphic for retina iPhone works you probably want to use that for your iPad UI. Specifics like app icons are a different beast and you will need 4.

3- iPad 4- iPad Retina (@2x.png files)