Can you mix React Native and Swift?

RCTRootView is a UIView that holds a React Native app . It also provides an interface between native side and the hosted app. RCTRootView has an initializer that allows you to pass arbitrary properties down to the React Native app.

Many (but not all) react-native npm packages that are added/installed into a project are Native Bridges. If the package is a pure JS package, then it is just that – pure JavaScript. If a react-native package contains an `ios` directory and an `android` directory, it is most-likely a Native Bridge .

Native Bridge is implemented as a part of Android Runtime (ART) in the Android architecture. It is used to support running native libraries in a different processor architecture so that an application with native libraries can run on a broader range of devices .

If you are wondering, RCT is an abbreviation of ReaCT . In addition to implementing the RCTBridgeModule protocol, your class must also include the RCT_EXPORT_MODULE() macro. This takes an optional argument that specifies the name that the module will be accessible as in your JavaScript code (more on this later).

React Native bridge is asynchronous , so the only way to pass a result to JavaScript is by using callbacks or emitting events (see below).

React Native is a framework that allows developers to use a single JavaScript codebase to build apps for that function on both iOS and Android devices . Unlike in the case of native apps, cross-platform app development allows apps to run on both types of devices without requiring two sets of coding.