How to create subscript characters that’s not in Unicode in iOS

I wasn’t able to get NSSuperscriptAttributeName to work but had success with the following:

UILabel *label = [[UILabel alloc] init];

NSString *string = @"abcdefghi";

NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:string];

NSInteger num1 = 1;
CFNumberRef num2 = CFNumberCreate(NULL, kCFNumberNSIntegerType, &num1);

[attrString addAttribute:(id)kCTSuperscriptAttributeName value:(id)num2 range:NSMakeRange(4,2)];

label.attributedText = attrString;

[attrString release];

This gives you: enter image description here

Assigning the attributed String to a label via label.attributedText is new with 6.0, but the way the attributed string is set-up might work with earlier versions of iOS.

Sending a negative value to kCTSuperscriptAttributeName give you a subscript.

Don’t forget to add the CoreText framework.

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