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Mastering React Native

You're reading from   Mastering React Native Learn Once, Write Anywhere

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781785885785
Length 496 pages
Edition 1st Edition
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Authors (2):
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Eric Masiello Eric Masiello
Author Profile Icon Eric Masiello
Eric Masiello
Jacob Friedmann Jacob Friedmann
Author Profile Icon Jacob Friedmann
Jacob Friedmann
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Table of Contents (13) Chapters Close

Preface 1. Building a Foundation in React FREE CHAPTER 2. Saying HelloWorld in React Native 3. Styling and Layout in React Native 4. Starting our Project with React Native Components 5. Flux and Redux 6. Integrating with the NYT API and Redux 7. Navigation and Advanced APIs 8. Animation and Gestures in React Native 9. Refactoring for Android 10. Using and Writing Native Modules 11. Preparing for Production 12. React Native Tools and Resources

Writing native modules

If we cannot find an open source module to meet our application's needs, we may need to write our own. For instance, we might need to write our own native module if we require some very specific behavior or if we have code from previously developed native applications that we want to incorporate into a React Native project.

We are going to create native modules-one for iOS and one for Android-that allow the user to select an image from their device's media library when the avatar icon is pressed on the profile page. As we develop these modules, we'll look at exposing both native methods and constants. We will also look at several different methods of communicating between JavaScript and native code, including callbacks, promises, and events.

Native modules in iOS

As we mentioned at the beginning of this chapter, in order to follow along in this section, you will need some basic Objective-C knowledge. When writing native modules for iOS, we will also work...

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