In general image@2x
can be used as a stand in for image
, but not the other way around (because they wouldn't look good). The side effect of doing this is that more memory will be used and on non-retina devices that could cause a problem. If you aren't supporting non-retina devices then you don't need any image
s.
Generally speaking you shouldn't have many image-568h@2x
images other than the Default
and other background images. Most of your content images will be the same size no matter what the screen size is. You do not need differently named images for a button of the same size on multiple different screen sizes.