Text does not render negative line spacing values

Originator:eric.horacek
Number:rdar://FB9842474 Date Originated:1/12/2022
Status:Open Resolved:
Product:SwiftUI Framework Product Version:iOS 15
Classification:Incorrect/Unexpected Behavior Reproducible:Yes
 
There is no public API in SwiftUI for rendering Text with a precise negative line spacing, which is a very common design requirement.

When a negative line spacing is provided to the `.lineSpacing(…)` view modifier, the `Text` does not respect it, and instead renders with a zero line spacing.

There is a view modifier that enables "tight" line spacing, `.leading(.tight)`, but it does not allow fine-grained control of the line spacing in `Text`, preventing you from achieving pixel-perfect designs.

Finally there is a private/underscore-prefixed API that enables this behavior on `View`, `_lineHeightMultiple(…)`, but it is only visible in the SwiftUI `swiftinterface` and is furthermore marked as deprecated, so it doesn't seem advisable to rely on it.

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