At this point in the chapter, you know how to kickstart a new React Native project. You also have your iOS and Android device simulators ready to go. In this final section, we'll walk through the process of building and deploying your project to a virtual device in development mode.
In the previous section, you opened up the iOS project for your React Native using the Xcode application itself. But it turns out that, most of the time, you won't actually need to do this. The simulator is a separate process, so we can run it using the React Native tools, from the MyProject/ directory:
react-native run-ios
This will start up the React Native packager process. It builds the app and is used to start up the simulator and to communicate with it. Here's what the iOS simulator looks like with the default React Native project:
There you have it; you're up-and-running in a simulated iOS environment! But rather than restarting the simulator every time you want to test...