Book Image

Getting Started with React Native

By : Ethan Holmes, Tom Bray
Book Image

Getting Started with React Native

By: Ethan Holmes, Tom Bray

Overview of this book

React Native is a game-changing approach to hybrid mobile development. Web developers can leverage their existing skills to write mobile applications in JavaScript that are truly native without using cross-compilation or web views. These applications have all of the advantages of those written in Objective-C or Java, combined with the rapid development cycle that JavaScript developers are accustomed to. Web developers who want to develop native mobile applications face a high barrier to entry, because they are forced to learn platform-specific languages and frameworks. Numerous hybrid technologies have tried to simplify this process, but have failed to achieve the performance and appearance that users expect. This book will show you all the advantages of true native development that React Native has without the steep learning curve, leveraging the knowledge you already have. We do this by getting you up and running quickly with a sample application. Next, we’ll introduce you to the fundamentals of creating components and explain how React Native works under the hood. Once you have established a solid foundation, you will dive headfirst into developing a real-world application from start to finish. Along the way, we will demonstrate how to create multiple screens and navigate between them,use layout and style native UI components, and access native APIs such as local storage and geolocation. Finally, we tackle the advanced topic of Native modules, which demonstrates that there are truly no limits to what you can do with React Native.
Table of Contents (15 chapters)

Generating the static bundle in iOS

So far, we have been serving the application's static bundle (where all of our JavaScript code lives) from a node server started by either Xcode or a terminal using react-native start. Before we create releases for iOS and Android, we need to generate the static JS bundle that our application will load. We will begin by creating the release in iOS; for Android, skip to the generating the Android APK section.

Once again, we are going to use the react-native-cli and execute the bundle command. The bundle command requires three flags: c, platform, and bundle-output. The entry-file specifies the path to the root component, the platform is either iOS or Android, and bundle-output is the path to place the generated bundle.

From the terminal in the root directory, run react-native bundle with an entry-file of index.ios.js, platform iOS, and point the path of the bundle-output to ios/main.jsbundle:

$ react-native bundle --entry-file index.ios.js --platform ios -...