Use @2x retina images for ipad in universal app? and does apple prefer native apps?

Question

I know there were some discussions about this but i could not find good answer?

My questions are -

1. I know that -

     [UIImage imageNam         
   
   
           

Answer 1

Maybe you can duplicate all images resources image@2x.png to image~ipad.png. Be careful to the case of "~ipad.png". But you have to manually manage stretched image with Cap (stretchableImageWithLeftCapWidth: topCapHeight:).