Ok, so I found a solution. You can't use the *.rcproject, but you can use the generated *.reality file. Add it to your project and then just copy paste the generated code in your own swift file and add `@available(iOS 13.0, *)` in front of the main class.Of course, you then need to do this again with every change in the reality composer project.
elSnupator
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You can find "RCPROJECT_CODEGEN_SWIFT_VERSION" in build settings, but I don't think that it'll work with objective c.
Having the same problem. Is it just too hard to add `@available(iOS 13.0, *)` for the main generated class Apple guys? Come on, you can do better than that..Is there any possible solution or we're just screwed and can throw all our work in the trash because Apple didn't expect that someone would use Reality composer in app with lower deployment target?