This is a Mac command line utility that creates all of requried app icon sizes from a single source image.
Ensure pngcrush is installed, and copy the makeicons.sh file into a directory with your source artwork. The source artwork should be a square png image that is at least 1024 x 1024.
Using Homebrew, you can install pngcrush with the command brew install pngcrush
- Open the Terminal app
cd /path/to/your/artwork
./makeicons.sh sourceartwork1024x1024.png
- Copy the files to your iOS or MacOS project.