Any seasoned iOS engineer will feel at home in UIKit on tvOS—but don’t let the platforms’ notable similarities seduce you into believing they are the same. Apple has made it easy to port your iOS app to tvOS. But if you don’t consider how your application will interact with the focus engine from the outset, you’ll find yourself fighting an uphill battle as you approach the finish line.

Source: Mastering the tvOS Focus Engine – Airbnb Engineering