One Dark Light Atom theme for Xcode

Installation

Manually

1. Copy the theme to the Xcode's FontAndColorThemes folder (~/Library/Developer/Xcode/UserData/FontAndColorThemes/).
2. Restart Xcode.
3. Enjoy.

ThemeInstaller app

Find and install ThemeInstaller app from the Mac App Store. Open theme you want to install and it's done. Themes are visible after Xcode is restarted.