https://www.swift.org/documentation/cxx-interop/project-build-setup/#:~:text=Swift%20Package%20Manager%20does%20not%20yet%20provide%20support%20forusing%20Swift%20APIs%20in%20C++.

Swift.org

Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns.

7:33 AM

Swift Package Manager does not yet provide support for using Swift APIs in C++.

7:33 AM

C++ interpoはドキュメントに明記されてますね

7:34 AM

C++ interpoは諦めたんですが、ObjCもだめなのかなぁと