App icon generator for Apple platforms.
See this blog post for more info.
brew tap tib/tap
brew install iconer
iconer ~/AppIcon.png ~/Icon.png
To use as a build script for iOS platform add a New Run Script Phase before the Copy Bundle Resources phase.
iconer "${SRCROOT}/${PROJECT_NAME}/AppIcon.png" -t "${SRCROOT}/${PROJECT_NAME}" -x -p "ios"
WTFPL