Fix iOS output

[germain-gg]

Fixes element-hq/compound#27
Follow up of #2

One for @pixlwave to keep an eye on.

Here are a few outstanding questions:

• How to deal with the "references", can we do math on CGFloat ?
• How to deal with the composition tokens
• Letter spacing?
• What tokens should be consumed directly ?

[janogarcia]

How to deal with the composition tokens

Not sure how exactly we should handle those in Style Dictionary (or if we need to do it at all) but if you are referring to typography composition tokens, I guess iOS engineers will be more interested in how those map to built-in text styles.

For example, font.body.lg.regular in Tokens Studio would match the builtin Body text style.

• https://developer.apple.com/design/human-interface-guidelines/foundations/typography/#specifications
• https://developer.apple.com/documentation/swiftui/font/body

Letter spacing?

They don't need to use/consume it independently on iOS, it's part of the built-in text styles.

What tokens should be consumed directly ?

Other than the mapping explained above for composition tokens, the may be interested in what modifiers we use for built-in text styles (e.g., bold, tight leading). But I'm not sure if that's how they're approaching it.

See the "Modify the built-in text styles if necessary" subsection in Apple HIG Typography docs.

[janogarcia]

See remarks in previous comment.