In iOS7, using NSLayoutManager with an NSTextStorage with ranges that have NSBaselineOffsetAttributeName set with a positive or negative offset (for subscript and superscript) works - the resulting ranges are currently rendered with a vertical offset.
However, using the lower level Core Text API CTTypesetterCreateLine on the same NSTextStorage produces a CTLine that renders all ranges with no vertical offset.
Since TextKit was introduced in iOS7, my concern is that this attribute may only work via the higher level NSLayoutManager but not via CTTypesetter.
Is there a way to get vertical baseline offsets to work on iOS7 using CTTypesetter?
