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最近在维护一个项目,需要引入ReactNative开发新UI。记录一下过程,表示我搞过。V
需要安装node环境
brew install node
npm install -g yarn
接着创建一个目录用来保存工程文件,并在目录项目下面创建一个package.json文件
mkdir demo
cd demo
npm init
加下来安装react native必须的库, 0.71.7版本是支持xcode14.2的,大于这个版本就需要xcode14.3了,我的电脑是MBP 2015 Mid,只能升级到xcode14.2,所以也只能用这个react-native版本。
yarn add react-native@0.71.7
yarn add react@18.2.0
react native部分就准备好了,接下来我们配置iOS部分,首先在demo目录下创建一个ios目录,把iOS源码copy到这个ios目录里面。接下来需要cocoapods的配置,编辑Podfile,在里面添加
require_relative ‘…/node_modules/react-native/scripts/react_native_pods’
require_relative '…/node_modules/@react-native-community/cli-platform-ios/native_modules’与use_react_native!。下面是一个Sample
# Uncomment the next line to define a global platform for your project
# platform :ios, '13.0'
require_relative '../node_modules/react-native/scripts/react_native_pods'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'
target 'App' do
# Comment the next line if you don't want to use dynamic frameworks
use_frameworks!
use_react_native!
# Pods for App
end
接下来
pod install
这下工程准备好了。
接下来我们用react native来写一个页面。再demo目录创建一个index.js文件,内容如下
import React from 'react'; import {AppRegistry, StyleSheet, Text, View} from 'react-native'; const RNHighScores = ({scores}) => { const contents = scores.map(score => ( <Text key={score.name}> {score.name}:{score.value} {'\n'} </Text> )); return ( <View style={styles.container}> <Text style={styles.highScoresTitle}> 2048 High Scores! </Text> <Text style={styles.scores}>{contents}</Text> </View> ); }; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#FFFFFF', }, highScoresTitle: { fontSize: 20, textAlign: 'center', margin: 10, }, scores: { textAlign: 'center', color: '#333333', marginBottom: 5, }, }); // Module name AppRegistry.registerComponent('RNHighScores', () => RNHighScores);
这是react native开发的页面, 注册的组件名是RNHighScores。接下来我们再iOS native端来显示这个页面。
创建一个UIViewController.
// // MyRNViewController.swift // App // // Created by Haven Tang on 2024/5/27. // https://reactnative.dev/docs/0.73/integration-with-existing-apps // https://www.youtube.com/watch?v=3wftC30CN2I // https://nishabe.medium.com/how-to-integrate-react-native-code-with-an-existing-ios-app-655c61a65b8c // https://fbflipper.com/docs/getting-started/ios-native/ // https://fbflipper.com/docs/getting-started/react-native/ import UIKit import React class MyRNViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. } override func loadView() { loadReactView() } func loadReactView() { let bundleUrl = URL(string: "http://localhost:8081/index.bundle?platform=ios") let mockData: NSDictionary = ["scores": [ ["name":"Alex", "value":"42"], ["name":"Joel", "value":"10"] ] ] let rootView = RCTRootView(bundleUrl: bundleUrl, moduleName: "RNHighScores", initialProperties: mockData as [NSObject : AnyObject], launchOptions: nil) self.view = rootView } }
显示这个view
@IBAction func showRNScoresView(_ sender: Any) {
let vc = MyRNViewController()
self.present(vc, animated: true)
}
接下来运行App验证一下, 这儿我们使用的Metro bundler是本地http://localhost的一个服务,需要网络访问,所以记得再plist中开启运行http访问网络。
<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<key>localhost</key>
<dict>
<key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
<true/>
</dict>
</dict>
</dict>
开启react native的Metro bundler server
npm start
运行App,点击xcode运行,或者命令行运行App
# From the root of your project
$ npx react-native run-ios
如果发布App的时候,我们需要将Metro bundler打包到App bundle里面。再package.json的scripts里面加上
"bundle-ios": "react-native bundle --entry-file index.js --bundle-output ./ios/bundle/main.jsbundle --platform ios --assets-dest ./ios/bundle --dev false",
"bundle-android": "react-native bundle --entry-file index.js --bundle-output ./android/app/src/main/assets/main.bundle --platform android --assets-dest ./android/app/src/main/res --dev false",
运行下面命令打包ios bundle
yarn bundle-ios
查看ios/bundle目录下文件,将其拖入xcode工程,这样就可以直接加载bundle中的资源了。
对应的bundleUrl需要调整一下:
let bundleUrl = NSBundle(URLForResource: "main" withExtension:"jsbundle")
要实现React native直接使用Native中的页面,可以使用React Native 的Native Component技术。后续会被Fabric 原生组件 替代。
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