问题： Packager can't listen on port 8081
办法：
Most likely another process is already using this port
Run the following command to find out which process:
lsof -i :8081
Then, you can either shut down the other process:
kill -9 <PID>
or run packager on different port.
问题：undefined is not object (evaluating 'ViewPropTypes.style')
办法：
run
npm uninstall react-native-scrollable-tab-view
run
npm install react-native-scrollable-tab-view@0.6.0
run
npm uninstall react-native-vector-icons
delete ( not necessary, it will be deleted automatically)
"react-native-vector-icons": "XXX"" in file "package.json"
run
npm install react-native-vector-icons
run
react-native link react-native-vector-icons
run
react-native run-ios
问题：npm install react-native-vector-icons 安装时报错：registry error parsing json
办法：npm config set registry "http://registry.npmjs.org/"
问题：unrecognized font family 'lonicons'
办法：将项目里node_modules/react-native-vector-icons/fonts里的字体放入xcode工程里，重新运行即可
问题：Build failing after updating to RN 0.4 - Redefinition of RCTLogLevel #375
办法：
I fixed this issue like this
if 'react-native' version >=0.40 then we should update 'react-native-vector-icons' version to 4.0.
Update using the following command
npm install --save react-native-vector-icons@4.0
