title: How can i find the source of this font-related coretext warning in IOS13?
body: <p>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.</p>
  
  <blockquote>
    <p>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:].</p>
  </blockquote>
  
  <p>I dug around a bit and found this quote from WWDC:</p>
  
  <blockquote>
    <p>As mentioned in numerous WWDC sessions, dot-prefixed font names are
    not to be directly used.</p>
  </blockquote>
  
  <p>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).</p>
  
  <p>Does anyone have any tips on how i can find where the warning comes from, and how to fix it?</p>