Will Xcode 7.3.1 work on macOS 10.12?

Question

I want to install and try out the new features of macOS 10.12. Also I really want to work on Xcode 8.0. But the same time I have some client projects which should written on Swi

Answer 1

Xcode 7.3.1 and Sierra is a non-supported configuration. While most of it will work, things like running a project on the simulator won't.