How to make subscripts and superscripts using NSAttributedString?

Question

I need to make subscripts for chemistry formulas (H2O, Na^2+, etc)?

Is this possible to do with NSAttributedString, or is there an alternative/easier way to make sub

Answer 1

you can also do the following if you want to make it a litle cleaner

NSDictionary *attr = @{ NSFontAttributeName: smallfont, 
                        (NSString*)kCTSuperscriptAttributeName: @1 }

NSRange fabricWeightRange = NSMakeRange(fabricWeight.location + 2, 1);                   
[subKeyString setAttributes:attr range:fabricWeightRange];