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Is it possible to download images from a web server and save them in such a way that
[UIImage imageNamed:@"filename"]
would still work for filename.png and filename@2x.png just as if they had been sent along in the application package all along?
Adding my comment as an answer. You can try to send the scale based on retina/non-retina and then download a single image based on that. You dont need to worry about combining two images and downloading since a device can be either retina or non-retina only. You dont need both images at the same time.