Create Xcode image catalogs (xcassets) on the fly. Iconizer builds the necessary file structure for you and generates all required images for App Icons, Launch Images and Image Set.
How do I install it?
Download the latest release and drop into your Application's folder.
Download the source code and it compile yourself.
You will need Carthage for this, to install Sparkle.
Via Homebrew Cask brew cask install iconizer
References: https://github.com/raphaelhanneken/iconizer