I’m currently looking into how to add a -ObjC flag in Xcode from unity, so it does not have to be done every new render of the project.
Looked for a notable while, but google and search seem to have failed this time.
John Bowden
The magic thing of editing Xcode project isn’t trivial. Easiest thing (what many plugins do) is to use Python + mod_pbxproj library and run it on Unity Postprocess
https://github.com/kronenthaler/mod-pbxproj