I'm trying to make something that behaves very similarly to a font manager, but I simply can't find any documentation on how I can, for example, add an OpenType font to the list NSFontManager provides. I see even Font Book shows fonts activated through a font manager app, so I want to understand what's happening under the hood. What libraries are being called?
Thank you!
It took me quite some time, but here's the way to go.
CTFontManagerRegisterFontURLs does exactly what I was looking for on macOS. Also, session 227 from 2019's WWDC has more info on it, albeit focused on iOS.
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