安装 rvm
$ curl -L get.rvm.io | bash -s stable
出现下面错误信息
curl: (7) Failed to connect to raw.githubusercontent.com port 443: Connection refused
解决办法：
1、查看网址
1. 打开网站https://www.ipaddress.com/
2. 查询一下 raw.githubusercontent.com对应的IP 地址
ip查看.png
3. 替换系统的host文件
注意:最好复制一份出来在更改
etc.png
hosts.png
hosts_ip.png
4. 然后执行命名：
$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
如果安装还是出现问题，可以试下借用知乎的方式：https://zhuanlan.zhihu.com/p/111014448
//安装Homebrew， 知乎的方式已经全部替换为国内地址
$ /bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"
安装完Homebrew，在执行安装rvm
$ curl -L get.rvm.io | bash -s stable
或
$ curl -sSL https://get.rvm.io | bash -s stable
rvm_gpg.png
$ source ~/.bashrc
$ source ~/.bash_profile
$ rvm -v
rvm 1.29.10 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]
列出ruby可安装的版本信息
$ rvm list known
# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.10]
[ruby-]2.3[.8]
[ruby-]2.4[.9]
[ruby-]2.5[.7]
[ruby-]2.6[.5]
[ruby-]2.7[.0]
ruby-head
安装一个ruby版本
$ rvm install 2.7.0
设置为默认版本
$ rvm use 2.7.0 --default
RVM is not a function, selecting rubies with 'rvm use ...' will not work.
You need to change your terminal emulator preferences to allow login shell.
Sometimes it is required to use `/bin/bash --login` as the command.
Please visit https://rvm.io/integration/gnome-terminal/ for an example.
设置失败，执行下面命令
$ source ~/.rvm/scripts/rvm
$ rvm use 2.7.0 --default
Using /Users/bobo/.rvm/gems/ruby-2.7.0
在看默认版本号
$ ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]
安装cocoapods
如果之前装过cocopods，最好先卸载掉，卸载命令：
$ sudo gem uninstall cocoapods
先查看本地安装过的cocopods相关东西，命令如下：
$ gem list --local | grep cocoapods
然后逐个删除吧：
//示例
$ sudo gem uninstall cocoapods-core
使用Homebrew安装CocoaPods
安装Homebrew
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
....
==> Installation successful!
表示安装成功
接着安装ruby，继续在终端中进行
$ brew install ruby
安装完成后替换一下ruby源
$ gem sources -l
*** CURRENT SOURCES ***
https://rubygems.org/
替换ruby源
gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
查看ruby源
$ gem source -l
*** CURRENT SOURCES ***
https://gems.ruby-china.com/
安装CocoaPods
$ sudo gem install -n /usr/local/bin cocoapods
出现 33 gems installed ，，表示安装成功
然后执行
$ pod setup
最后在iOS工程中的Podfile目录下执行下面命令
$ pod install
或
$ pod update