Swift UI gives Apple iOS developers a new way to build interfaces. It incorporates benefits seen in Flutter and React Native, such as hot reloading and declaritive reactive components. These lead to faster development times. We've seen the iOS development community say very good things about it.
It is currently in Beta and only works on iOS 13 and above, and can be used for production apps. Because it is so actively under development, we'd advise that you assess it and consider using it once it is stable.