I have just begun learning wxWidgets GUI library. By watching OttoBotCode on Youtube, I have set up this basic template of a single panel GUI app with several example controls.
I run all of my GUI apps on Linux, but the CMAKELists.txt included here is almost the default from the downloaded library. It should build on Windows and Mac, but I can't attest to that. You would be on your own if you tried using this repository.
Always, use at your own risk.