React Native升级需要更新cocoapods问题

由于react-native升级到0.42.0，报错：jschelpers/JavaScriptCore.h file not found,根据相关github issues反馈，需将cocoapods升级到1.2.0

• 执行升级cocoapods之后：

sudo gem install cocoapods -v 1.2.0

报错：

ERROR:  Could not find a valid gem 'cocoapods' (= 1.2.0) in any repository
ERROR:  While executing gem ... (OpenSSL::SSL::SSLError)
    hostname "upyun.gems.ruby-china.org" does not match the server certificate

• 在想是不是需要升级下gem，于是执行：

sudo gem update --system

报错：

ERROR:  While executing gem ... (OpenSSL::SSL::SSLError)
    hostname "upyun.gems.ruby-china.org" does not match the server certificate

• 看来是源路径的问题，修改源路径：

gem sources --remove https://ruby.taobao.org/
gem sources -a https://gems.ruby-china.org

gem更新成功

• 更新cocoapod：

sudo gem install cocoapods

报错：

ERROR:  While executing gem ... (Errno::EPERM)
    Operation not permitted - /usr/bin/xcodeproj

于是修改语句为：

sudo gem install -n /usr/local/bin cocoapods --pre

升级成功