React Native vs Swift
Swift is a general-purpose, a multi-paradigm and modern programming language which is developed by Apple Inc. to build there iOS- devices. It is a powerful and intuitive language which is easy to learn. It follows the Objective-C runtime library, which allows C, Objective-C, C++, and Swift code to run within one program.
Comparison between React Native and Swift
Building the app with Swift is coding a native app from scratch. So, every element needs to be polished separately.
Speed of coding
When we talk about coding, the Swift language took off the legacy of Objective -C used before.
Generally, the native app should perform better than the framework-based one. But it is not so simple. As compare to Swift, React Native is slightly better when coming to CPU usage optimization. However, when we talk about graphic effects, it may be more troublesome for the framework. To overcome this challenge, React Native enables developers to embed the native code into the app.