Downloading normal image Vs retina device image (2x)

Question

When we need to download an image from some URL and show it on two kinds of devices -- Retina (with 2x image) and regular device -- Should we have two different image URLs to ha

Answer 1

CGFloat screenScale = [UIScreen mainScreen].
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:myUrl] scale:screenScale];