How can i find the source of this font-related coretext warning in IOS13?

ios objective-c swift xcode core-text
Mathias picture Mathias · Nov 5, 2019 · Viewed 7.5k times · Source

Working on an update of my app i notice that i get tons of warnings in the log when running the app in Xcode 11.2 on IOS13.

CoreText note: Client requested name ".SFUI-Regular", it will get TimesNewRomanPSMT rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[UIFont systemFontOfSize:].

I dug around a bit and found this quote from WWDC:

As mentioned in numerous WWDC sessions, dot-prefixed font names are not to be directly used.

I am myself almost exclusively using IB and nibs to set fonts for textfields etc., and there is no reference to "SFUI-Regular" in my code anywhere, so i am not sure how to find the actual reason for these warnings (i have something like 20-30 rows of these in the logs).

Does anyone have any tips on how i can find where the warning comes from, and how to fix it?

Answer

clatt picture clatt · Nov 5, 2019

There is another output in console, you can try to add a symbolic breakpoint

CoreText note: Set a breakpoint on CTFontLogSystemFontNameRequest to debug.

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