I second this. SwiftUI 2.0 is nearly out and it's a huge improvement and far easier, faster and more enjoyable than React Native. Swift itself is one of the more productive languages around IMO and it can be learned gradually, it's a complex language but you can be productive using just a subset of it. Open XCode, select a starter template and away you go, no fiddling with npm dependencies or a bunch of cocoapods and objc bridging code.