Feature Request: A section in usage.md on how to enable Xcode Previews

[brentleyjones]

This is the top search in our repo, and it's not always clear how to enable previews for swift_library targets.

[joprice]

I've gone through some of the issues referencing this and checked out the "integration" example but can't seem to figure out how to get this to work. In lieu of a longer doc, could you write a few sentences here on the recommended approach? I've tried wrapping swift_library's in ios_framework, but I get linker errors and can't seem to find a setup that pleases xcode.

[thiagohmcruz]

Checked examples/integration in the latest main (28931c024335ac5d90b9fb4ddebf0fbce42eed9c) and it's indeed broken during linking (LibFramework.iOS not found via rpath). I was trying to run the preview from this source: https://github.com/MobileNativeFoundation/rules_xcodeproj/blob/28931c024335ac5d90b9fb4ddebf0fbce42eed9c/examples/integration/UI/ContentView.swift.

Noticed that if I stop un-focusing that target the preview works as expected though.

The above is for examples/integration, so non-rules_ios. Specifically for rules_ios users one option is to flip link_dynamic like I described here: #2612 (comment)

If you could verify if the above for examples/integration also works for you @joprice that would be great. Happy to add a blurb in usage.md (for both use cases) once we're able to root cause the issue above.

[joprice]

@thiagohmcruz I haven't had time to test this, but just found that the new incremental generation might fix my issue #1384. I'm testing that now, so this workaround might not apply for my case after that.