一、安装cocoapods
1、查看gem源
gem sources -l
2、切换gem源
remove后边是gem sources -l显示的当前gem源，如果已经是https://gems.ruby-china.org/，可跳过此步。
gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/
3、安装cocoapods
sudo gem install cocoapods
也可以安装到指定路径：
sudo gem install -n /usr/local/bin cocoapods
二、可能出现的报错信息
1、没有权限
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
解决方案：命令前加sudo。
2、gem版本太老
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/update_rubygems
解决方案：下载最新版gem，解压，进入目录
sudo ruby setup.rb
使用以下命令安装pod
sudo gem install -n /usr/local/bin cocoapods
3、pod update卡住不动
解决方案
pod update --verbose --no-repo-update
4、ruby环境太老
ERROR: SSL verification error at depth 1: unable to get local issuer certificate (20)
ERROR: You must add /C=IL/O=StartCom Ltd./OU=Secure Digital Certificate Signing/CN=StartCom Certification Authority to your local trusted store
ERROR: SSL verification error at depth 2: self signed certificate in certificate chain (19)
ERROR: Root certificate is not trusted (/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA)
需要更新ruby到2.2以上。
1、安装rvm
curl -sSL https://get.rvm.io | bash -s stable
2、装载rvm
source ~/.rvm/scripts/rvm
3、修改rvm下ruby的源
echo "ruby_url=https://cache.ruby-china.org/pub/ruby" > ~/.rvm/user/db
4、查看支持的ruby版本
rvm list known
5、安装ruby 2.4
rvm install 2.4.0
6、设置2.4为默认
rvm use 2.4.0 --default
5、SSL证书问题
error: RPC failed; curl 56 SSLRead() return error -9806/s
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
Failed during: git fetch origin master:refs/remotes/origin/master --tags --force --depth=1
使用以下命令忽略报错信息
sudo gem install -n /usr/local/bin cocoapods
或
sudo gem install -n /usr/local/bin GEM_NAME_HERE
6、pod setup缓慢，几乎不动
fatal: unable to access 'https://github.com/CocoaPods/Specs.git/': SSLRead() return error -9806
使用国内镜像
cd ~/.cocoapods
git clone https://code.aliyun.com/Magi/CocoaPods.git master
7、rvm install ruby 报错
Error running '__rvm_make install',
showing last 15 lines of /Users/用户名/.rvm/log/1494312229_ruby-2.4.0/install.log
查看install.log找到具体原因
Referenced from: /Users/RenChao/.rvm/src/ruby-2.4.0/.ext/x86_64-darwin16/openssl.bundle
Reason: image not found - /Users/RenChao/.rvm/src/ruby-2.4.0/.ext/x86_64-darwin16/openssl.bundle
解决方法：安装openssl
rvm pkg install openssl
三、彻底卸载cocoapods
使用卸载命令sudo gem unintall cocoapods失败，需要手动卸载。
1、查看pod命令的路径，并删除
which pod
比如pod命令路径为/usr/local/bin/pod，然后删除
rm -rf /usr/local/bin/pod
2、查看已安装与cocoapods相关的组件
gem list | grep cocoapods
运行结果：
cocoapods-core (1.0.1)
cocoapods-deintegrate (1.0.1)
cocoapods-downloader (1.1.1)
cocoapods-plugins (1.0.0)
cocoapods-search (1.0.0)
cocoapods-stats (1.0.0)
cocoapods-trunk (1.0.0)
cocoapods-try (1.1.0)
3、依次卸载各相关组件
sudo gem uninstall cocoapods-core
sudo gem uninstall cocoapods-downloader
sudo gem uninstall cocoapods-plugins
sudo gem uninstall cocoapods-search
sudo gem uninstall cocoapods-stats
sudo gem uninstall cocoapods-trunk
sudo gem uninstall cocoapods-try
cocoapods已彻底卸载，需要的话可以重新安装。
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