How to find unused images in an Xcode project?

Question

Has anyone a one-line to find unused images in an Xcode project? (Assuming all the files are referenced by name in code or the project files - no code generated file names.)

Answer 1

May be you can try slender, does a decent job.

update: With emcmanus idea, I went ahead and create a small util with no ack just to avoid additional setup in a machine.

https://github.com/arun80/xcodeutils