Appending NSAttributedStrings not working as expected - macos

Question

I'm trying to append attributed strings to make chord names like "G#m7" where the # and 7 are superscript. I'm doing it like this:
NSFont* font = [NSFont fontWithName:kGillSans size:24];
NSMutableDictionary* attributeNormal = [[NSMutableDictionary alloc] init];
[attributeNormal setObject:font forKey:NSFontAttributeName];
[attributeNormal setObject:color forKey:NSForegroundColorAttributeName];
NSFont* fontSmall = [NSFont fontWithName:kGillSans size:14];
NSMutableDictionary* attributeSuperScript = [[NSMutableDictionary alloc] init];
[attributeSuperScript setObject:fontSmall forKey:NSFontAttributeName];
[attributeSuperScript setObject:[NSNumber numberWithInteger:5] forKey:NSSuperscriptAttributeName];
[attributeSuperScript setObject:color forKey:NSForegroundColorAttributeName];
NSAttributedString* pitch = [[NSAttributedString alloc] initWithString:#"G" attributes:attributeNormal];
NSAttributedString* accidental = [[NSAttributedString alloc] initWithString:#"#" attributes:attributeSuperScript];
NSAttributedString* quality = [[NSAttributedString alloc] initWithString:#"m" attributes:attributeNormal];
NSAttributedString* seventh = [[NSAttributedString alloc] initWithString:#"7" attributes:attributeSuperScript];
NSMutableAttributedString* fullString = [[NSMutableAttributedString alloc] initWithAttributedString:pitch];
[fullString appendAttributedString:accidental];
[fullString appendAttributedString:quality];
[fullString appendAttributedString:seventh];
I then add this to a CATextLayer for display. Unfortunately, it's not working as expected. The superscripts are not superscript, and the [fullstring size] that is returned with it is way off, resulting in a hard to place layer. I turned the border width on to demonstrate the size issue.
I've experimented with different font sizes and values for the superscript attribute. Any ideas?

Answer 1

Try this:
NSFont* font = [NSFont fontWithName:#"GillSans" size:24];
NSDictionary * attributeNormal = #{NSFontAttributeName: font,
NSForegroundColorAttributeName: [NSColor blackColor]};
NSFont* fontSmall = [NSFont fontWithName:#"GillSans" size:14];
NSDictionary * attributeSuperScript = #{NSFontAttributeName: fontSmall,
NSSuperscriptAttributeName: #(2),
NSForegroundColorAttributeName: [NSColor blackColor]};
NSMutableAttributedString* fullString =
[[NSMutableAttributedString alloc]
initWithAttributedString:[[NSAttributedString alloc]
initWithString:#"G"
attributes:attributeNormal]];
[fullString appendAttributedString:
[[NSAttributedString alloc] initWithString:#"#"
attributes:attributeSuperScript]];
[fullString appendAttributedString:
[[NSAttributedString alloc] initWithString:#"m"
attributes:attributeNormal]];
[fullString appendAttributedString:
[[NSAttributedString alloc] initWithString:#"7"
attributes:attributeSuperScript]];