1.打开终端
2 移除现有 Ruby 默认源 输入以下指令

gem sources --remove https://rubygems.org/

3.使用新的源 输入以下指令

 gem sources -a https://ruby.taobao.org/

4.验证新源是否替换成功 输入以下指令

 gem sources -l

5.安装 CocoaPods

 sudo gem install cocoa pods

//–––––––––––那么问题来了——没遇到的自动跳过————————————
错误提示1
Error installing cocoapods: activesupport requires Ruby version >= 2.2.2.
1、安装 RVM baby 版本管理器

 curl -L get.rvm.io | bash -s stable

//________等安装完成 出现下面这行提示以下___________
In case of problems: https://rvm.io/helpandhttps://twitter.com/rvm_io
//___________________

执行

source ~/.bashrc  

执行

source ~/.bash_profile  

测试是否安装正常 执行

rvm -v  

//________提示以下___________
rvm 1.27.0 (latest) by Wayne E. Seguin wayneeseguin@gmail.com, Michal Papis mpapis@gmail.com [https://rvm.io/]
//___________________
2、用RVM升级Ruby
查看当前ruby版本 执行

ruby -v 

列出已知的ruby版本 执行

rvm list known

//________提示以下___________

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[.8]
[ruby-]2.2[.4]
[ruby-]2.3[.0]
[ruby-]2.2-head
ruby-head

for forks use: rvm install ruby-head-<name> --url https://github.com/github/ruby.git --branch 2.2

JRuby

jruby-1.6[.8]
jruby-1.7[.23]
jruby[-9.0.5.0]
jruby-head

Rubinius

rbx-1[.4.3]
rbx-2.3[.0]
rbx-2.4[.1]
rbx[-2.5.8]
rbx-head

Opal

opal

Minimalistic ruby implementation - ISO 30170:2012

mruby[-head]

Ruby Enterprise Edition

ree-1.8.6
ree[-1.8.7][-2012.02]

GoRuby

goruby

Topaz

topaz

MagLev

maglev[-head]
maglev-1.0.0

Mac OS X Snow Leopard Or Newer

macruby-0.10
macruby-0.11
macruby[-0.12]
macruby-nightly
macruby-head

IronRuby

ironruby[-1.1.3]
ironruby-head
//___________________
安装ruby 2.2.2 执行

rvm install 2.2.2

完成后 执行

ruby -v

//–––––打印输出–––––––
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
//––––––––––––

6 继续安装 CocoaPods

 sudo gem install cocoa pods

//______安装成功提示如下______
Done installing documentation for nap, fourflusher, escape, colored, concurrent-ruby, thread_safe, tzinfo, i18n, activesupport, claide, xcodeproj, molinillo, cocoapods-try, netrc, cocoapods-trunk, cocoapods-stats, cocoapods-search, cocoapods-plugins, cocoapods-downloader, cocoapods-deintegrate, fuzzy_match, cocoapods-core, cocoapods after 21 seconds
23 gems installed
//_______________

 pod setup

备注：苹果系统升级 OS X EL Capitan 后安装改为:
sudo gem install -n /usr/local/bin cocoapods
pod setup
7.更新 gem

 sudo gem update --system

8.新建工程，并在终端用 cd 指令到文件夹内
pod search 第三方
9.新建 Podfile 文件

$ touch Podfile

10.编辑 Podfile 文件，并写入要添加的第三方库

platform:ios, '8.0'
pod 'AFNetworking', '~> 2.3.1'<-------第三方

11.导入第三方库

 pod install
pod install --verbose --no-repo-update

12.退出终端