What's a good way to manually test a stubbed View Controller?

Right now I just edit my AppDelegate or SceneDelegate, and make it the first thing I see (which is pretty annoying). One option I've heard is a UI test with a very long sleep statement. Is there a better option?

To be clear, I’m not trying to create an automated, UI test suite. I just want an easier way to manually test a graphical part of my code that doesn't involve temporarily changing the code path for my project.