rvm安装参考:
https://www.youtube.com/watch?v=3d88blL0loI
brew install gnupg
curl -sSL https://rvm.io/mpapis.asc | gpg --import
curl -sSL https://rvm.io/pkuczynski.asc | gpg --import
curl -sSL https://get.rvm.io | bash -s stable
rvm install 3.0.0
如果安装ruby时openssl报错,则先卸载brew安装的高版本,再安装ruby,安装完了之后,再把brew的openssl安装回去
brew uninstall opensssl --ignore-dependencies
rvm install 3.0.0
brew install openssl
ruby -v
gem environment
gem install cocoapods
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