[https://developer.apple.com/fonts/system-fonts/) shows dozens of system fonts. And it says "Apple platforms come with many preinstalled fonts that can be used by your app’s user interface. " on the top of the web page. Does it mean I can use any of them in my iOS app legally? Does it involve font license issue? What else should I pay attention to use system fonts legally?
legal font used in iOS app
Does it mean I can use any of them in my iOS app legally?
Yes.
Does it involve font license issue?
No. (Huh?)
What else should I pay attention to use system fonts legally?
Err... not much?
What exactly is your concern?