在原生项目集成RN后，连接npm server 或者加载React Native的bundle 包出现：Native module cannot be null. 的错误，这时，你需要检查下你的cocoapods 里面是否包含了'RCTLinkingIOS'模块，如果没有，加上试试，类似下面这样：
pod 'React', :path => './node_modules/react-native', :subspecs => [
'Core',
'CxxBridge', # Include this for RN >= 0.47
'DevSupport', # Include this to enable In-App Devmenu if RN >= 0.43
'RCTText',
'RCTNetwork',
'RCTImage',
'RCTLinkingIOS',
'RCTWebSocket', # Needed for debugging
'RCTAnimation', # Needed for FlatList and animations running on native UI thread
# Add any other subspecs you want to use in your project
]
然后再pod install 一下，重新运行项目，是不是就OK了？
