ReactNative 版本 0.27.2 真机调试，一直红屏，报错
could not connect to development server
检测流程:
1.工程目录npm start OK
2.AppDelegate.m的localhost换成PC上的IP地址 192.168.0.103，且PC上的地址和手机上的同一局域网 OK
3.xcode提示
WebSocket connection failed with error Error Domain=NSPOSIXErrorDomain表示连接超时，解决方法RCTWebSocketExecutor.m中的localhost换成PC地址，据说新版本不用换了
Connection to http://localhost:8081/debugger-proxy timed out. Are you running node proxy? If you are running on the device, check if you have the right IP address in RCTWebSocketExecutor.m.这个世界安静了...