run-ios is one such utility which invokes the runIOS() function defined in the runIOS.js file.

These can be found under the local-cli folder of the React-Native node module. React-Native provides a number of command line utilities to work with the app. For this to happen, there are a bunch of steps which are executed when we run the above command. Successful execution would open the app on a simulator or a connected device. React-Native apps can be launched on iOS simulators/physical devices by running the following command in the root folder of an app: react-native run-ios This template creates the relevant Xcode project files under the iOS folder of the app. It creates a native app template for you. React-native provides this neat utility called init. Without further ado, let's try to understand the what and how of the process to run React-Native apps on iOS. React-Native provides command line utilities to run an app on iOS and Andriod simulators/devices. I want to help any other person who is starting off afresh with React-Native app development.

Partly, that was the motivation to come up with this piece. There was no one place which summarized what React-Native does to get the app working. I spent a lot of time going through the relevant code. I was also curious to understand what happens under the hood when React-Native runs an app on a device or a simulator. I was surprised by the ease and level of abstraction provided by React-Native’s command line interface. This was my first foray into native app development. I recently started to develop a React-Native app on iOS. By Soujanya PS How to run a React Native app on iOS

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