Accidentally dragged a font's typeface out of the font dialog and "deleted" it
I had the same problem with the hack typeface and managed to resolve the issue.

You have to go to /Users/&gt;&gt;your_username&lt;&lt;/Library/Developer/Xcode/UserData/FontAndColorThemes
and then open a *.dvtcolortheme file.

This file has xml syntax. There you'll find string elements with the current font, typeface and size.

Select all font and typeface and change it with your deleted one.



Save the file and restart &amp; check your Xcode.
Your missing typefaces should be there again.