Make sure you use the correct names as of filename@2X.png
for Retina and filename.png
for non-Retina images.
Make sure you always use filename.png
name convention and not the @2x in code.
Make sure you use the right dimension. My UITabBar
images are some 39x48 pixels for Retina on the iPhone.
I would also advise you to convert to asset catalogs
as they are enormously easy to use.