换了电脑，要重新安装cocoapods，中间遇到了一些问题，虽然解决了但是为了方便下一次在可能的安装使用，因此整理了整个安装过程以及问题，记录在此贴中。
安装
安装ruby管理工具rvm
安装命令：curl -L get.rvm.io | bash -s stable
指定源：source ~/.rvm/scripts/rvm
列出rvm中所有ruby版本：rvm list known
指定安装某个版本的ruby：rvm install 2.6
安装cocoapods
安装命令：sudo gem install cocoapods
输入这个命令后如果长时间没有反应，那么可能是镜像源的问题，用命令：gem sources -l查看当前镜像源，如果是https://rubygems.org/那么就将其替换为https://ruby.taobao.org/，具体命令为：gem sources --remove https://rubygems.org/，gem sources -a https://ruby.taobao.org/
淘宝镜像源现已无法使用更换为:gem sources -a http://gems.ruby-china.com/
然后重新执行安装命令：sudo gem install cocoapods
此时提示我这样一个错误
ERROR:While executing gem ... (Gem::DependencyError)
Unable to resolve dependencies: cocoapods requires cocoapods-core (= 1.2.0), cocoapods-downloader (< 2.0, >= 1.1.3), cocoapods-trunk (< 2.0, >= 1.1.2), molinillo (~> 0.5.5), xcodeproj (< 2.0, >= 1.4.1)
开始时我个人的解决方法是直接调用命令进行这些依赖的安装
sudo gem install cocoapods-core
sudo gem install cocoapods-downloader
sudo gem install cocoapods-trunk
sudo gem install molinillo
这些都没有问题，成功的将依赖升级到适合的版本
但是在最后一个sudo gem install xcodeproj的时候它又提示我新的问题
ERROR:While executing gem ... (Gem::DependencyError)
Unable to resolve dependencies: xcodeproj requires nanaimo (~> 0.2.3)
我尝试用sudo gem install nanaimo去安装nanaimo则提示我
ERROR:Could not find a valid gem 'nanaimo' (>= 0), here is why:
Unable to download data from https://ruby.taobao.org/ - bad response Forbidden 403 (https://gems-ruby-china.b0.upaiyun.com/latest_specs.4.8.gz)
看着意思应该是在淘宝镜像源中没有对应的nanaimo下载，镜像源除了淘宝我也不知道还有哪些，没办法，通过百度得到的解决方法是直接升级gem，也就是说不用上面的命令去安装cocoapods requires cocoapods-core (= 1.2.0), cocoapods-downloader (< 2.0, >= 1.1.3), cocoapods-trunk (< 2.0, >= 1.1.2), molinillo (~> 0.5.5), xcodeproj (< 2.0, >= 1.4.1)这些依赖，直接升级gem就可以了
升级命令为：gem update --system
遇到问题
gem update --system
Updating rubygems-update
Fetching: rubygems-update-2.7.7.gem (100%)
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
提示没有权限，加上sudo提权
sudo gem update --system
成功后在调用安装命令：sudo gem install cocoapods
提示新的问题
ERROR:While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/xcodeproj
没有路径权限，调用另外一条命令安装：sudo gem install -n /usr/local/bin cocoapods --pre
整个安装过程log如下
Successfully installed xcodeproj-1.4.4
Fetching: ruby-macho-1.1.0.gem (100%)
Successfully installed ruby-macho-1.1.0
Fetching: gh_inspector-1.0.3.gem (100%)
Successfully installed gh_inspector-1.0.3
Fetching: fourflusher-2.0.1.gem (100%)
Successfully installed fourflusher-2.0.1
Fetching: escape-0.0.4.gem (100%)
Successfully installed escape-0.0.4
Fetching: cocoapods-try-1.1.0.gem (100%)
Successfully installed cocoapods-try-1.1.0
Fetching: cocoapods-trunk-1.2.0.gem (100%)
Successfully installed cocoapods-trunk-1.2.0
Fetching: cocoapods-stats-1.0.0.gem (100%)
Successfully installed cocoapods-stats-1.0.0
Fetching: cocoapods-search-1.0.0.gem (100%)
Successfully installed cocoapods-search-1.0.0
Fetching: cocoapods-plugins-1.0.0.gem (100%)
Successfully installed cocoapods-plugins-1.0.0
Fetching: cocoapods-deintegrate-1.0.1.gem (100%)
Successfully installed cocoapods-deintegrate-1.0.1
Fetching: cocoapods-core-1.2.1.gem (100%)
Successfully installed cocoapods-core-1.2.1
Fetching: cocoapods-1.2.1.gem (100%)
Successfully installed cocoapods-1.2.1
Parsing documentation for xcodeproj-1.4.4
Installing ri documentation for xcodeproj-1.4.4
Parsing documentation for ruby-macho-1.1.0
Installing ri documentation for ruby-macho-1.1.0
Parsing documentation for gh_inspector-1.0.3
Installing ri documentation for gh_inspector-1.0.3
Parsing documentation for fourflusher-2.0.1
Installing ri documentation for fourflusher-2.0.1
Parsing documentation for escape-0.0.4
Installing ri documentation for escape-0.0.4
Parsing documentation for cocoapods-try-1.1.0
Installing ri documentation for cocoapods-try-1.1.0
Parsing documentation for cocoapods-trunk-1.2.0
Installing ri documentation for cocoapods-trunk-1.2.0
Parsing documentation for cocoapods-stats-1.0.0
Installing ri documentation for cocoapods-stats-1.0.0
Parsing documentation for cocoapods-search-1.0.0
Installing ri documentation for cocoapods-search-1.0.0
Parsing documentation for cocoapods-plugins-1.0.0
Installing ri documentation for cocoapods-plugins-1.0.0
Parsing documentation for cocoapods-deintegrate-1.0.1
Installing ri documentation for cocoapods-deintegrate-1.0.1
Parsing documentation for cocoapods-core-1.2.1
Installing ri documentation for cocoapods-core-1.2.1
Parsing documentation for cocoapods-1.2.1
Installing ri documentation for cocoapods-1.2.1
13 gems installed
成功后调用命令测试是否能够使用pod search AFNetworking
提示
Setting up CocoaPods master repo
$ /usr/bin/git clone https://github.com/CocoaPods/Specs.git master --progress
Cloning into 'master'...
remote: Counting objects: 1195714, done.
remote: Compressing objects: 100% (16968/16968), done.
error: RPC failed; curl 56 SSLRead() return error -36 358.00 KiB/s
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
[!] /usr/bin/git clone https://github.com/CocoaPods/Specs.git master --progress
Cloning into 'master'...
remote: Counting objects: 1195714, done.
remote: Compressing objects: 100% (16968/16968), done.
error: RPC failed; curl 56 SSLRead() return error -36 358.00 KiB/s
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
根据第一句的提示是需要setup pod，此时调用命令：pod setup
Setting up CocoaPods master repo
$ /usr/bin/git clone https://github.com/CocoaPods/Specs.git master --progress
Cloning into 'master'...
remote: Counting objects: 1195723, done.
remote: Compressing objects: 100% (16976/16976), done.
remote: Total 1195723 (delta 10159), reused 33 (delta 33), pack-reused 1177785
Receiving objects: 100% (1195723/1195723), 391.28 MiB | 313.00 KiB/s, done.
Resolving deltas: 100% (572641/572641), done.
Checking out files: 100% (148629/148629), done.
Setup completed
这个过程没有遇到问题
最后再次验证pod search AFNetworking
能够显示出正确结果，说明安装成功，可以使用了