• 执行pod install 报错：

Could not find 'minitest' (>= 5.1) among 39 total gem(s) (Gem::MissingSpecError)

• 终端详细信息：

/Library/Ruby/Site/2.6.0/rubygems/specification.rb:1413:in `rescue in block in activate_dependencies': Could not find 'minitest' (>= 5.1) among 39 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/myg/.gem/ruby/2.6.0:/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0:/usr/local/Cellar/cocoapods/1.11.3/libexec' at: /usr/local/Cellar/cocoapods/1.11.3/libexec/specifications/activesupport-6.1.5.gemspec, execute `gem env` for more information
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1410:in `block in activate_dependencies'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `each'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `activate_dependencies'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1381:in `activate'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1417:in `block in activate_dependencies'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `each'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `activate_dependencies'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1381:in `activate'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1417:in `block in activate_dependencies'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `each'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `activate_dependencies'
    from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1381:in `activate'
    from /Library/Ruby/Site/2.6.0/rubygems.rb:286:in `block in activate_bin_path'
    from /Library/Ruby/Site/2.6.0/rubygems.rb:285:in `synchronize'
    from /Library/Ruby/Site/2.6.0/rubygems.rb:285:in `activate_bin_path'
    from /usr/local/Cellar/cocoapods/1.11.3/libexec/bin/pod:23:in `<main>'
/Library/Ruby/Site/2.6.0/rubygems/dependency.rb:311:in `to_specs': Could not find 'minitest' (>= 5.1) among 39 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/myg/.gem/ruby/2.6.0:/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0:/usr/local/Cellar/cocoapods/1.11.3/libexec' , execute `gem env` for more information
    from 

• 1.解决办法

先卸载掉homebrew里面的cocoapods：
brew uninstall cocoapods

然后再用gem的方式安装：
sudo gem install cocoapods

如果不报错就可以直接 pod install了

如果报错，看下边：

• 问题2：输入密码后发现又特么报错 :While executing gem ... (Gem::FilePermissionError)

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0 directory.
mayonggang@mayonggang ~ % 

• 解决问题2：指定的ruby路径不对，应当使用更新版本的ruby
  安装rbenv
  指定使用rbenv的gem来执行

• • 安装rbenv

$ rbenv install -l

$ rbenv install -l
2.6.10
2.7.6
3.0.4
3.1.2
jruby-9.3.4.0
mruby-3.0.0
rbx-5.0
truffleruby-22.1.0
truffleruby+graalvm-22.1.0

• -最新的是3.1.2。但是我下载失败，换成了3.1.1就没事儿了

$ rbenv install 3.1.1

• • 指定ruby 版本

$ rbenv global 3.1.1
$ rbenv rehash

• • 查找gem路径

$ rbenv which gem
/Users/用户名/.rbenv/versions/3.1.1/bin/gem

• • 添加相关路径到PATH中

$ export PATH="$HOME/.rbenv/versions/3.1.1/bin:$PATH"

然后再次 ：sudo gem install cocoapods就可以了

$ sudo gem install cocoapods
Password:
Fetching colored2-3.1.2.gem
Fetching claide-1.1.0.gem
Fetching CFPropertyList-3.0.5.gem
Fetching xcodeproj-1.21.0.gem
Fetching ruby-macho-2.5.1.gem
Fetching nanaimo-0.3.0.gem
Fetching atomos-0.1.3.gem
Fetching nap-1.1.0.gem
Fetching molinillo-0.8.0.gem
Fetching gh_inspector-1.1.3.gem
Fetching fourflusher-2.3.1.gem
Fetching escape-0.0.4.gem
Fetching cocoapods-try-1.2.0.gem
Fetching netrc-0.11.0.gem
。。。

然后就可以开心的pod install 了

如果有些常见的SDK找不到，

[!] Unable to find a specification for .....
或者
[!] Unable to find a pod with name, author, summary, or description matching `....`

那可能是需要更新一下pod

$ pod update

运行pod install时，如果在最后报错：

[!] An error occurred while processing the post-install hook of the Podfile.

No such file or directory - python

/Users/myg/Desktop/P_gitee/1.数字北京/Podfile:139:in ``'
/Users/myg/Desktop/P_gitee/1.数字北京/Podfile:139:in `block (3 levels) in from_ruby'
/Users/myg/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/podfile.rb:196:in `post_install!'
/Users/myg/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:945:in `run_podfile_post_install_hook'

• • 处理方法：
    我的提示语是没有python这个文件路径，
    我去Podfile中搜索了一下output =python #{root_path}/DS_BeiJing/Third/BaiDuAI/scheme_desc_collector.py #{root_path}`