Use Large Text Accessibility feature in iOS app

Question

In iOS devices it is possible to set Large Text in the Accessibility Settings. The user can specify different font sizes here. I would like to use this font size in my app as well. I haven't found anything about accessing this font size in my app in the Accessibility Program Guide. It only mentions that the standard Apple apps Mail, Contacts, Calendars etc are using it. Does anyone know if this information is accessible when developing an app?

The static -FontSize methods of UIFont also do not return different values when the Large Text feature is set.

(NOTE: Not to be confused with iOS 7's new Dynamic Type. This is a different, older option under the Accessibility settings.)

Answer 1

It's not accessible using documented APIs.

Just for fun though: (do not use in a real app, it will probably get you rejected from the store)

It's stored under com.apple.Accessibility.plist, key preferredFontSize

MobileNotes.app (and presumably the others) get it using the function

extern float _UIAccessibilityLargeTextFontSize(float);

(it's so undocumented they made sure to start it with an underscore.)

Answer 2

Accessibility settings is not accessible through iOS SDK. In iOS 7, you can support Dynamic Type, which allows you to set any font to the system font in the size defined by the user by calling +preferredFontWithTextStyle:.