$ pod install 后出现下面错误：
[!] CocoaPods could not find compatible versions for pod "Folly":
In snapshot (Podfile.lock):
Folly (from `./RNComponent/node_modules/react-native/third-party-podspecs/Folly.podspec`)
In Podfile:
Folly (from `./RNComponent/node_modules/react-native/third-party-podspecs/Folly.podspec`)
React/CxxBridge (from `./RNComponent/node_modules/react-native`) was resolved to 0.57.5, which depends on
Folly (= 2016.10.31.00)
以为是cocoapods 版本高了，用低版本的试试
$ pod _1.1.1_ install ，依然报错
[!] Unable to satisfy the following requirements:
- `Folly (from `./RNComponent/node_modules/react-native/third-party-podspecs/Folly.podspec`)` required by `Podfile`
- `Folly (= 2016.10.31.00)` required by `React/CxxBridge (0.57.5)`
仔细看下错误原因，发现 CxxBridge 应该去掉，去掉即可