Some of the Xcode-themes which looks great with Xcode dark and light modes.
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Clone the repo: $ git clone https://github.com/suhitp/xcode-theme.git
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Create a folder at below path if it doesn't exist already: ~/Library/Developer/Xcode/UserData/FontAndColorThemes
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Copy the files with .xccolortheme extension into the FontAndColorThemes folder.
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Xcode-themes use 'Source Code Pro' and 'Fira code' Fonts. Download the fonts from Source Code Pro and Fira Code links.
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Unzip the font archive and move the files in the TTF folder to ~/Library/Fonts.
 
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Restart the Xcode
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go to Xcode > Preferences > Fonts & Colors
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Select the new theme.
 
Pull requests are welcome with new themes. For any changes, please open an issue first to discuss what you would like to change.