HelloWord --RN

1.运行rn到iOS模拟器上

react-native run-ios --simulator

2.错误：

ls: /Users/Jerry/Library/Caches/com.facebook.ReactNativeBuild/glog-0.3.5.tar.gz: No such file or directory
shasum: /Users/Jerry/Library/Caches/com.facebook.ReactNativeBuild/glog-0.3.5.tar.gz:

答案：是下载第三方库失败，修改

/Users/Jerry/Desktop/demoTests/HelloWorld/node_modules/react-native/scripts/ios-install-third-party.sh

文件中下载地方的代理，

        (cd "$cachedir"; curl -J -L -O "$url")
        fetched=yes

修改之后：

rm -f "$cachedir/$file"
        (cd "$cachedir"; curl -J -L -O -x 127.0.0.1:1087 "$url")
        fetched=yes

方可解决问题

3. “config.h” file not found react native iOS

这是下载的第三方没有编译需要执行命令

cd node_modules/react-native/third-party/glog-0.3.4/
./configure

4.

Port 8081 already in use, packager is either not running or not running correctly
Command PhaseScriptExecution failed with a nonzero exit code

设置 build System LegacyBuild System

5.8081占用

error:Connection to localhost port 8081 [tcp/sunproxyadmin] succeeded!
Port 8081 already in use, packager is either not running or not running correctly
Command /bin/sh failed with exit code 2

方案：

killall -9 node
yarn start &react-native run-ios

6.识别不了CFBundleIdenID

react-native app doesn't work ":CFBundleIdentifier", Does Not Exist 

方案：

删除node_modules 和相关的build文件夹 
执行npm install

7. 占用8081

 ERROR  Metro Bundler can't listen on port 8081

方案：

a.找到占用端口的应用

sudo lsof -i :8081//占用8081的进程
kill -9 40247 //杀死进程
react-native start //重新启动服务

8 .root-state is uid 777 and doesn't match your euid 501

方案：

rm -rf /usr/local/var/run/watchman/root-state

HelloWord

至此 Helloword已经运行完成，不过文字没有显示出来，那我们把标签的代码贴出来。

import React, { Component } from 'react';
import {
  Platform,
  StyleSheet,
  Text,
  View
} from 'react-native';

const instructions = Platform.select({
  ios: '第一个程序\n',
  android: '第一个程序\n',
});

export default class App extends Component<{}> {
  render() {
    return (
      <View style={styles.container}>
      
        <Text style={styles.welcome}>
          Hello Word
        </Text>
       
        <Text style={styles.instructions}>
          {instructions}
        </Text>
      </View>
    );
  }
}