使用React Native轻松构建iOS应用

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"React Native for iOS Development 是一本实践指南，教你如何轻松开发原生iOS应用。本书通过React Native挑战传统iOS开发方式，采用革命性的组件、异步执行、独特的触摸处理方法等。它消除了对Objective-C的依赖，转而利用JavaScript和React的力量构建出色的原生应用。本书将引导你理解使React.js与众不同的突破性概念，如设置React Native并探索React Native应用的结构。你将了解Flux架构，它与MVC的不同之处，以及如何将其融入你的React Native项目中，以不同且高效的方式解决问题。接下来，你将学习创建吸引人的用户界面，并与各种设备功能交互。通过使用React Native社区已经开发的一些流行包，你可以提高开发效率，做到写得更少但实现更多。最后，你将学习编写测试用例以及如何将应用提交到App Store。书中的例子基于实际场景，采用实例驱动的方法，让你在每个章节结束时都有一个实际运行的应用。今天就开始使用这本书来为你的iOS开发采用React Native吧。目录： Chapter 1: 学习基础：React快速入门 Chapter 2: 最简单的程序：React Native的Hello World Chapter 3: 布局、画笔与绘图：操作用户界面 Chapter 4: Flux：以不同方式解决问题 Chapter 5: 设备功能 Chapter 6: 与服务器通信 Chapter 7: React Native补充知识" 本书由Akshat Paul和Abhishek Nalwaya撰写，是JavaScript领域的专家之声。通过React Native for iOS Development，你可以掌握使用React和JavaScript构建惊艳iOS应用的技能。书中涵盖从React的基础知识，到构建用户界面，处理设备能力，与服务器通信，以及React Native生态系统的补充知识。每个章节都配有实际示例，旨在让你边学边做，每个阶段都能看到实际成果。同时，你还将学习如何遵循版权法律进行合法复制和使用书籍内容。通过本书，开发者能够深入理解React Native，并能有效地将其应用于iOS应用的开发中。

4 CHAPTER 1: Learning the Basics: A Whistle-Stop Tour of React

This feature of virtual DOM is not just important but a killer feature of React. DOM access

is super slow, and humbly speaking, the world has made it worse by hitting the DOM again

and again in most of the applications. To make your application fast, you should touch the

DOM as little as possible, and this is beautifully handled by the implementation of virtual

DOM. You won’t notice this with a small and trivial application, but once your app grows

to having thousands of DOM elements all trying to get updated, React will not let your

performance feel the impact.

One-Way Data Flow

React is primarily the V in a MVC pattern but before you dive into the idea of one-way data

flow in React, you must understand the challenges of MVC frameworks. One of the biggest

challenges of a MVC framework is managing the view. As you know, the view component of

the MVC framework is mainly the DOM representation. It is simple when you write code that

interacts with the DOM, but it is very complicated for the framework to handle various DOM

manipulations.

Traditional MVC views generally encompass a lot of heavy UI, and as the data changes

even for a tiny element, it eventually re-renders the app again, and the cycle continues. The

reason for this is that typically most of these MVC frameworks follow two-way data binding

(see Figure 1-3).

Figure 1-2. Components with virtual DOM

7CHAPTER 1: Learning the Basics: A Whistle-Stop Tour of React

Another useful instrument to boost your productivity with React Native is React Developer

Tools, which is a very useful Chrome extension that allows you to inspect React component

hierarchy in the Chrome browser:

https://chrome.google.com/webstore/detail/react-developer-tools/

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For convenience, you will be using the following setup for your examples in this chapter:

Facebook cdn for both React Native and JSX transformer.

react.js: http://fb.me/react-0.13.3.js

JSX transformer: http://fb.me/JSXTransformer-0.13.3.js

Simply refer to them in your code. Next, you will install the node packages browserify,

watchify, and babelify, which will help you transform and keep your JSX in appropriate js files:

$ npm install react browserify watchify babelify --save-dev

$ watchify –t babelify ./your-jsx-file.jsx –o ./final-js-file.js –v

That’s great! To serve the application, you will be using the simple python server

(SimpleHTTPServer) in the root of the project folder via the following command:

$ python -m SimpleHTTPServer

Simple python server will serve your examples by default on the 8000 port.

Now that you are done with your setup, you can quickly start to understand the concepts

of React.

Introduction to Components

React is all about components. Anything and everything you do in React is based on reusable

components. In other words, with React you only do one thing, and that is build components.

In previous sections, we discussed separation of concerns. The whole concept of these

components is that they are totally encapsulated, making them easy to test and reuse.

Creating reusable components is a work of art and React Native provides many features

for you. You will do a deep dive into them soon, but first let’s create a simple “Hello World”

component.

Create a hello_world.html file and paste the following code into it:

<!DOCTYPE html>

<html>

<head>

</head>

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