The font sizing option preferred by the user.
- iOS 10.0+
- tvOS 10.0+
With Dynamic Type, users can ask that apps display text using fonts that are larger or smaller than the normal font size defined by the system. For example, a user with a visual impairment might request a larger default font size to make it easier to read text. Use the value of this property to request a
UIFont object that matches the user's requested size.