在设置Ruby环境时输入
sudo gem install -n /usr/local/bin cocoapods
遇到下面错误
ERROR: Could not find a valid gem 'cocoapods' (>= 0), here is why:
Unable to download data from https://gems.ruby-china.org/ - bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)
很明显404找不到上面的网址，你复制到浏览器，它会提醒你改成了com结尾，So：
一、删除
gem sources --remove https://gems.ruby-china.org/
二、添加
gem sources -a https://gems.ruby-china.com
三、检查
gem sources -l
如果是
*** CURRENT SOURCES ***
https://gems.ruby-china.com
代表成功，再执行
sudo gem install -n /usr/local/bin cocoapods
