执行pod repo update报错：Failed to co

现象描述

在iOS项目中引入RN库的时候，执行pod install提示以下错误：

Analyzing dependencies
Fetching podspec for `React` from `./React/node_modules/react-native`
Fetching podspec for `yoga` from `./React/node_modules/react-native/ReactCommon/yoga`
[!] Unable to satisfy the following requirements:

- `React/BatchedBridge (from `./React/node_modules/react-native`)` required by `Podfile`

None of your spec sources contain a spec satisfying the dependency: `React/BatchedBridge (from `./React/node_modules/react-native`)`.

You have either:
 * out-of-date source repos which you can update with `pod repo update`.
 * mistyped the name or version.
 * not added the source repo that hosts the Podspec to your Podfile.

Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.

然后执行pod repo update报错如下：

Updating spec repo `master`
[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down

大体意思就是说连接失败，检查是否是网络问题

解决方案

升级 ruby 到最新版本； 然后升级 cocoaPods 到最新版本

// 升级ruby：
brew update
brew install ruby

// 升级cocoaPods：
sudo gem install cocoapods

如果报错，可以尝试如下：
1、更新gem：sudo gem update --system
2、删除gem源：gem sources --remove https://ruby.taobao.org/
3、修改gem源：gem sources -a https://gems.ruby-china.com
4、查看gem源是否是最新的：gem sources -l
5、升级cocoapods：sudo gem install -n /usr/local/bin cocoapods --pre
6、查看升级后的cocoapods版本：pod --version

当查看gem源时执行gem sources -l显示应该是：

*** CURRENT SOURCES ***

https://gems.ruby-china.com

有且仅有一个源，如果没有显示源链接，则执行修改gem源操作

提示
原来的源为https://gems.ruby-china.org，但是由于备案问题，其域名改为了.com，即https://gems.ruby-china.com