In my app I want to let the user download and use fonts, but I don't know how to do this dynamically. I know we have to specify the fonts we want to use in the app's Info.plist file, but we can't add anything to that plist file programmatically. There is zynga's library but it is a subclass of UILabel.
Please help
You could use CGFontCreateWithDataProvider() followed by CTFontCreateWithGraphicsFont(). Then you'd have a CTFont, which you can draw using Core Text.
As far as I know there's no way to get a UIFont from a custom font without either having the font in your app bundle and using the Info.plist method (i.e. not downloading it), or using private APIs.
来源：https://stackoverflow.com/questions/9821211/in-ios-is-it-possible-to-add-a-font-to-the-app-during-runtime