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

This is a more robust solution - it checks for any reference to the basename in any text file. Note the solutions above that didn't include storyboard files (completely understandable, they didn't exist at the time).

Ack makes this pretty fast, but there are some obvious optimizations to make if this script runs frequently. This code checks every basename twice if you have both retina/non-retina assets, for example.

#!/bin/bash

for i in `find . -name "*.png" -o -name "*.jpg"`; do 
    file=`basename -s .jpg "$i" | xargs basename -s .png | xargs basename -s @2x`
    result=`ack -i "$file"`
    if [ -z "$result" ]; then
        echo "$i"
    fi
done

# Ex: to remove from git
# for i in `./script/unused_images.sh`; do git rm "$i"; done