Super/Subscript appear to be broken in iOS13 (NSAttributedString)

Question

Trying to display super/subscript text using NSAttributedString in a UITextView seems broken in iOS13 - unless anyone knows otherwise?

Curiously if I use the UIFont

Answer 1

Simple 'fix' for this one.

It appears kCTSuperscriptAttributeName no longer works in iOS13 (for non-system fonts.) You need to use NSSuperscriptAttributeName instead. No idea where the definition for this lives (which header) so the actual string value required is "NSSuperScript"