新建项目报错如下：
需要手动生成ios下的main.jsbundle文件
解决方法：
1、生成main.jsbundle文件，在终端项目目录下执行:
react-nativebundle--entry-file index.js--bundle-output./ios/main.jsbundle--platform ios--assets-dest./ios--devfalse
或在 package.json 里面添加以下执行命令,终端执行yarn buildios即可生成main.jsbundle文件：
"buildios":"react-native bundle --entry-file='index.js' --bundle-output='./ios/main.jsbundle' --dev=false --platform='ios'",
2、然后在xcode添加，然后重新打包就可以了
参考原文：https://www.jianshu.com/p/f3a09d2d49d2
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