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

There is no good built-in way of not duplicating the higher res iphone retina images for the iPad. You could write your own UIImage extension or subclass that uses the user interface idiom macro to determine your platform, then automatically append "@2x" to the image name:

+ (UIImage *) imageNamedSmart:(NSString *)name
{
    if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad )
        return [UIImage imageNamed:[NSString stringWithFormat:@"%@@2x.png", name]];
    return [UIImage imageNamed:[NSString stringWithFormat:@"%@.png", name]];
}

and you'd call it like this:

[UIImage imageNamedSmart:@"myImage"]