2017年React Native权威指南：构建跨平台移动应用

React

Native

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[ vi ]

Verifying that the CPU/ABIs are installed

335

Starting the Android emulator

336

Adding Android support to RNNYT

337

Branching platform logic

339

Refactoring RNNYT for Android

341

Fixing Android vibration 343

Using DrawerLayoutAndroid 344

Customizing Android styling 347

Enabling LayoutAnimation 351

Summary

352

Chapter 10: Using and Writing Native Modules

353

Using native modules

354

Installing native modules

354

Using the library

355

Profile page 355

Adding the profile to the iOS home screen 358

Adding the profile to the Android home screen 362

Writing native modules

365

Native modules in iOS

366

Setting up the module 366

Exporting methods 372

Communicating with callbacks 378

Communicating with promises 381

Communicating with events 384

Exporting constants 387

Native modules in Android

388

Setting up the module 388

Exporting methods 394

Communicating with callbacks 395

Communicating with promises 396

Communicating with events 398

Exporting constants 399

Summary

402

Chapter 11: Preparing for Production

403

Testing

403

Unit testing

405

Component testing

408

Performance

411

Problematic ListView

412

Using Perf Monitor 412

Analyzing a Systrace 415

The React Perf Library 422

Preface

React Native is a library for creating mobile applications using familiar web technologies

without sacrificing performance or the look and feel typically associated with fully native

applications. It is built on top of Facebook’s open source JavaScript library, React, and

indeed, iOS and Android applications created using the library are primarily written in

JavaScript. Because one does not need to learn new languages, ecosystems, and best

practices for each platform they work on, React Native is pushing the boundaries of what is

possible for React developers.

In this book, we will look at the fundamental concepts of React and React Native, as well as

the libraries and tools within the React Native ecosystem. We will also work towards the

more practical goal of creating a complete React Native application. Finally, we’ll dig into

useful and complex React Native concepts such as animation, navigation, native modules,

testing and performance analysis. Upon turning over the last page of this book, you’ll be

armed with the knowledge to create polished, sophisticated mobile applications using React

Native.

What this book covers

Chapter 1, Building a Foundation in React, In order to work effectively in React Native, you

must first understand React. This chapter explains the motivation behind React and teaches

you how to think in React.

Chapter 2, Saying Hello World in React Native, contains two primary topics. First, we’ll

review how React Native works and compare it to other popular mobile development

options. Then, we’ll switch gears and focus on configuring your computer to build your

first React Native project for iOS.

Chapter 3, Styling and Layout in React Native, React Native borrows many concepts from the

web development world, including some of the best parts of Cascading Style Sheets (CSS).

It also deliberately avoids some of CSS’s less desirable qualities. This chapter explains how

to style React Native apps and how to use Flexbox to layout components.

Chapter 4, Starting our Project with React Native Components, React Native includes many

powerful components and APIs. This chapter demonstrates how to use many of these as we

begin to build our news reader app, called Readly.

Preface

[ 2 ]

Chapter 5, Flux and Redux, ... The React community has largely eschewed the Model View

Controller pattern in favor of a unidirectional data flow pattern called Flux. In this chapter,

we’ll help you think in Flux and explain how to leverage a popular Flux implementation

known as Redux.

Chapter 6, Integrating with the NYT API and Redux, builds upon what we learned in this

chapter. In order to bring our Readly app to life, we’ll implement Redux and Redux

middleware as a means of managing our data and communicating with the New York

Times API.

Chapter 7, Navigation & Advanced APIs, Navigation in React Native has been a long journey

resulting in an abundance of navigation options. But which should you choose? This

chapter will make sense of these options. We’ll then apply experimental navigation

components along with other advanced React Native APIs to our project.

Chapter 8, Animation and Gestures in React Native, React Native offers two primary ways of

creating fluid animations. This chapter will explain how to apply each of these along with

touch gesture support to build out an on boarding experience for our Readly app.

Chapter 9, Refactoring for Android, React Native makes cross platform development simple.

However, configuring your computer to actually build for Android is a bit less than simple.

This chapter will walk you through, step by step, how to install and configure all the tools

necessary for Android development. We’ll then revisit our project, refactoring it to both

work and feel like a first class Android app.

Chapter 10, Using and Writing Native Modules, One of the most amazing parts of React

Native is that it doesn’t limit you to the components and APIs that come packaged with the

framework. If you want your app to do something else, you can either bridge custom native

code to React Native or include other third-party libraries. This chapter adds additional

capabilities to our project by exploring how to create custom native code written in

Objective C for iOS and Java for Android.

Chapter 11, Preparing for Production, Discovering the root cause of bug or performance

problem can be a real chore. In this chapter we’ll introduce Jest, a testing framework along

with other tools for uncovering pesky performance problems. Finally, we’ll show you how

to bundle your apps so you can ship them to the iOS and Android stores.

Preface

[ 3 ]

Chapter 12, React Native Tools & Resources, React Native is praised for its awesome

developer experience and cross platform support. But can we take React Native even

further? In this final chapter, we’ll show off some tools that can improve upon how you

build React Native apps. Then we’ll explore a few React Native projects that allow us to

extend platform support to the web, macOS, and even Windows.

What you need for this book

While we will add Android support to our project in later chapters, the majority of this

book focuses on iOS development. In order to develop for iOS, you must have access to an

Apple Mac computer capable of running Xcode 7 or later. Xcode is only necessary for

building and testing React Native apps. You’re welcome to edit your code in any editor or

IDE of your choosing.

In addition to Xcode, React Native requires a few other tools. These include Homebrew,

Node.js (6.5.0 or later), npm (3.10.3 or later), Watchman, the React Native CLI, and Google

Chrome for debugging. We’ll explain what all these tools are and how to install them in

Chapter 2, Saying Hello World in React Native.

In Chapter 9, Refactoring for Android, we’ll update our project so it can run on both

platforms. Android has its own set of software requirements including the Java

Development Kit (JDK 1.8 or later) and Android Studio. Once again, we’ll walk you

through how to install and configure these tools in Chapter 9, Refactoring for Android.

Finally, in Chapter 12, React Native Tools & Resources, we’ll evaluate software that can aid

your React Native workflow and allow you to build React Native apps for even more

platforms. All of these installations are completely optional. However, it’s worth noting that

the React Native plugin for Universal Windows Platform will require a computer or virtual

machine running Windows 10 and Visual Studio 2015 Community.

Who this book is for

It’s expected the reader possess a strong understanding of JavaScript and is familiar with

ECMAScript 2015 (ES2015 or ES6). Code samples in this book will heavily leverage ES2015

features such as classes, arrow functions, destructuring, and spreading. Familiarity with

React, mobile development, HTML, and CSS will aid in your understanding but are not a

requirement.

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