I will still continue supporting this Solarized Dark theme for the Xcode community.
This theme works with Xcode 8, 9, and 10.
This theme used to work with Xcode 5, 6, and 7, but due to the changes to the theme editor, the latest version of this theme is no longer compatible with those versions.
which will install the file in Xcode
Copy the .xccolortheme file into the following directory: