It appears that:
[[NSBundle mainBundle] pathForResource:@\"name\" ofType:@\"png\"];
Does not return anything for assets that are inside the Ima
Try using the image name as determined in the "Compile asset catalog" step. You'll find this in the build output. Be sure to expand the transcript - you should see something like this:
/* com.apple.actool.compilation-results */
/path/to/Debug-iphonesimulator/Your.app/LaunchImage-800-Portrait-736h@3x.png
/path/to/Debug-iphonesimulator/Your.app/LaunchImage-800-667h@2x.png
/path/to/Debug-iphonesimulator/Your.app/LaunchImage-700@2x.png
/path/to/Debug-iphonesimulator/Your.app/LaunchImage-700-568h@2x.png
/path/to/Debug-iphonesimulator/Your.app/LaunchImage-700-Landscape~ipad.png
/path/to/Debug-iphonesimulator/Your.app/LaunchImage-700-Landscape@2x~ipad.png
Tested using +[UIImage imageNamed:] with Xcode 6.1.1.