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

I wrote a lua script, I'm not sure I can share it because I did it at work, but it works well. Basically it does this:

Step one- static image references (the easy bit, covered by the other answers)

• recursively looks through image dirs and pulls out image names
• strips the image names of .png and @2x (not required/used in imageNamed:)
• textually searches for each image name in the source files (must be inside string literal)

Step two- dynamic image references (the fun bit)

• pulls out a list of all string literals in source containing format specifiers (eg, %@)
• replaces format specifiers in these strings with regular expressions (eg, "foo%dbar" becomes "foo[0-9]*bar"
• textually searches through the image names using these regex strings

Then deletes whatever it didn't find in either search.

The edge case is that image names that come from a server aren't handled. To handle this we include the server code in this search.