使用React Native构建iOS应用指南

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“React Native for iOS Development (完整版) - 学习资料，非商业使用” React Native 是一个由Facebook开发的开源框架，它允许开发者使用JavaScript和React库来构建原生的iOS应用。通过React Native，开发者可以利用一套统一的编程语言和工具链，实现跨平台的开发，同时保持iOS应用的性能和用户体验。 React Native的核心概念是“Learn once, write anywhere”，即学习一次，到处编写。这使得开发者能够复用JavaScript代码，为Android和iOS等多个平台构建应用。React Native基于React.js，引入了组件化的开发方式，使得开发者能够构建可复用、可维护的代码模块。本书“React Native for iOS Development”由Akshat Paul和Abhishek Nalwaya撰写，旨在帮助读者深入理解React Native在iOS开发中的应用。书中可能涵盖了以下知识点： 1. **React基础知识**：首先，你需要了解React的基础，包括JSX语法、组件化、状态管理（如useState和useEffect钩子）以及生命周期方法。 2. **React Native环境搭建**：设置开发环境，包括安装Node.js、创建React Native项目、配置模拟器或真机设备，以及使用Expo CLI或Create React Native App等工具。 3. **React Native组件**：学习React Native提供的各种原生组件，如View、Text、Image、TextInput、TouchableOpacity等，以及如何自定义样式。 4. **布局和样式**：理解Flexbox布局系统，用于创建复杂的界面设计。学习如何使用样式表和内联样式。 5. **网络请求与数据管理**：使用fetch API或第三方库如axios进行HTTP请求，以及使用Redux或MobX等状态管理库来处理应用的数据流。 6. **原生模块集成**：当JavaScript无法满足需求时，如何与Objective-C或Swift代码交互，实现原生功能。 7. **动画与交互**：了解React Native的动画API，如Animated库，以及如何创建用户交互。 8. **测试与调试**：学习如何使用React Native Debugger、Chrome DevTools和Simulator的Inspector工具进行调试，以及单元测试和集成测试的策略。 9. **性能优化**：探讨性能最佳实践，如减少重渲染、使用PureComponent和memo，以及优化图片加载等。 10. **发布与部署**：了解如何打包和发布React Native应用到App Store，包括签名证书、版本管理和持续集成流程。通过阅读这本书，开发者不仅可以掌握React Native的原理和实践，还能提升在iOS开发领域的专业技能，实现高效且跨平台的移动应用开发。

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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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使用React Native构建iOS应用指南

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设置 RN 配置: 在Vue项目的根目录创建rn-cli.config.js文件，配置React Native CLI。如果你是首次使用React Native，可能还需要运行npx react-native init初始化一个React Native项目模板。具体如何操作