Retina "@2x" graphics incorrectly being used on standard-def display (using Snow Leopard / Xcode 4.2 )
I am developing a Mac app using Xcode 4.2 in OS X 10.6 Snow Leopard.
My Xcode project contains, in the same folder and at exactly-doubled dimensions:
image.png
image@2x.png
I use the Apple-recommended -[NSImage imageNamed:] method to load the correct resource depending on the user's screen type:
[NSImage imageNamed:@"image"];
However, when I run the app on my non-retina 1440x900 display, the "@2x" version of the image is displayed. I get a 100x100 image when it should be a 50x50.
The same code works fine to deliver both standard-def and retina images, depending, when I run the app in 10.7 Lion (switching between standard and HiDPI modes).
I've thus far been unable to get Snow Leopard HiDPI (720x450) mode to work. But it still should be displaying the standard-def image when I use my standard-def display.
Is there a limitation of either Snow Leopard or Xcode 4.2 that causes this to work incorrectly? If so, how do you release an app that has a Deployment Target of 10.6 but still also has retina graphics support?
It seems as if Snow Leopard or Xcode 4.2 cannot properly combine High Resulotion Artwork into a single .tiff file?
Set Combine High Resolution Artwork to NO in your Target's Build Settings.
IMPORTANT: I then additionally needed to manually delete the previously created .tiffs from my app's bundle. -[NSImage imageNamed:] prefers the single .tiff to the 2 .pngs, so it will use the .tiff file if it finds it. Make sure it doesn't.
