Look at UIKit clones for Mac. There was one called Blueprint a few years ago. I'm not sure of the state of the art now. A Mac app starter kit (icon management,

Look at UIKit clones for Mac. There was one called Blueprint a few years ago. I'm not sure of the state of the art now. A Mac app starter kit (icon management, menu, upgrading, etc.) With the iOS app ported in with a UIKit clone should get you what you want with much better performance than a web/JS-based solutio ln that will compromise your iOS app.