1、安裝homebrew
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
2、安裝ruby
brew install ruby
替換為國內源
gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
檢查是否替換成功
gem sources -l
3、安裝cocopods
sudo gem install -n /usr/local/bin cocoapods
