iOS原生项目集成React-Native,按React-Native中文网教程走，因为是新版本0.54.4的React-Native，中间遇到React-Native依赖库安装总是失败，其中一条错误提示：SDK "iPhoneOS" cannot be located
坑呀，各种百度，找到解决链接：https://blog.csdn.net/woaizijiheni/article/details/50614062，记录如此，主要是Xcode路径不对，根本原因是我之前安装个两个Xcode，
xcode-select --print-path
/Library/Developer/CommandLineTools
$ xcodebuild -showsdks
xcode-select: error: tool ‘xcodebuild‘ requires Xcode, but active developer directory ‘/Library/Developer/CommandLineTools‘ is a command line tools instance
修改路径正确命令行 $ sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer/
搞定，
另今天导入React-Native，练习，完成后发现运行项目总是提示folly/folly-config.h 找不到，苦逼的试了好几次，依旧报错，后尝试package.json中把React-Native版本修改降到0.54，重新npm install，然后pod install，项目才算编译成功，，，
