安装cocoapods

1、ruby环境
在安装Cocoapod前要确认ruby是否正确安装，可以用如下命令确认当前ruby环境：
bogon:~ wangpo$ ruby -v
ruby 2.3.3p222 (2016-11-21 revision 56859) [universal.x86_64-darwin17]
bogon:~ wangpo$ gem -v
2.7.6

2、gem源

• 查看gem源
  bogon:~ wangpo$ gem sources -l
  CURRENT SOURCES

https://rubygems.org/

• 移除系统自带的源
  bogon:~ wangpo$ gem sources –remove https://rubygems.org/
  https://rubygems.org/ removed from sources
  bogon:~ wangpo$ gem sources -l
  CURRENT SOURCES
• 添加新源
  bogon:~ wangpo$ sudo gem sources –add https://gems.ruby-china.org/
  Password:
  https://gems.ruby-china.org/ added to sources

bogon:~ wangpo$ gem sources -l
CURRENT SOURCES

https://gems.ruby-china.org/

3、安装Cocoapod

• 没有权限安装

bogon:~ wangpo$ gem install cocoapods
Fetching: concurrent-ruby-1.0.5.gem (100%)
ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions for the /Library/Ruby/Gems/2.3.0 directory.
No permissions for the /usr/bin directory.
bogon:~ wangpo$ sudo gem install cocoapods
…
…
ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions for the /usr/bin directory.

• 正确打开方式

bogon:~ wangpo$ sudo gem install cocoapods -n /usr/local/bin
Successfully installed fuzzy_match-2.0.4
Fetching: cocoapods-core-1.4.0.gem (100%)
…
…
22 gems installed

安装成功

bogon:~ wangpo$ pod –version
1.4.0