You actually do have to run macos. You don't have to buy a mac but if you can install osx on your machine or if you buy a hackintosh, You shouldn't have any problem. As far as I can say, there is an emulator and it is quite possible to make it run on windows and compile things.
I read somewhere that you can do most of the job with pain on windows, but you'll end up singing your package on osx. While as funny as it is. Someone gave the idea to run osx in a vm. You could probably do that if you really need to.
Anyway the simplest way to do that is to buy a mac, but if you really reject the idea to spend money on a mac, you could find a way to do all you need without a mac. But you almost definitely need to install osx.