I have used many Sketch to iOS/React conversion apps previously and turns out to be not what I expected. Kind of gave up my hope on such apps. When I saw Supernova, thought it to be another of these apps, but their website kind of pulled me in & their AMAZING customer service made me try it out.
Turns out trying it out was a great move as I was blown away by Supernova Studio as it exported a working Sketch mockup to an iOS app. It even has its own type of "Auto Layout"!