I've actually been developing my own UI library backed by SDL. It currently uses a DSL-like system similar to SwiftUI. I just spent some late nights working on a "hot-reloading" system, though it only works on Mac/Linux currently.

In theory any C based UI libs that support those platforms should work as long as they can be called from Swift.

That’s pretty dang cool! I’d love to contribute, if you’re open to it.

The most difficult thing I’ve done with Swift/C was packaging a Python interpreter inside a Mac app with a few lxml dependencies called with PythonKit. Might not begin to scratch the surface of what you need though...

Could always use some help. It's still in it's infancy right now, very much a PoC to see if it was worth attempting. Once it gets to a good enough state I will make the repo public and let you know. Props to

Nice job embedding Python in Swift. I haven't done Python, but Wren and Gravity were pretty challenging to get working right. I was going to use a scripting layer for the UI, but eventually came up with a solution that allows for Swift to be used. I sort of mimic the system Apple uses for Playgrounds/Live Preview in Xcode.

> What are you using for GUI libraries? Or are these mostly accessed from the command line?

I'm not a Swift user, but the approach I've seen is people using it to run a localhost HTTP server for a HTML+JS frontend.