转载自：www.jianshu.com/p/9e4e36ba8574
1、升级Ruby环境
终端输入：$gem update --system
2.更换ruby镜像地址
（1）查看当前镜像地址
终端输入：$ gem sources 或者 $ gem sources -l
终端输出：
*** CURRENT SOURCES ***
https://rubygems.org/
(2)移除当前镜像地址
终端输入：$ gem sources --remove https://rubygems.org/
输出；https://rubygems.org/ removed from sources
(3)添加国内最新镜像
终端输入：$ gem source -a https://gems.ruby-china.org/
输出：https://gems.ruby-china.org/ added to sources
3.安装CocoaPods
终端输入：$ sudo gem install cocoapods
终端输出：
Password:
Fetching: nanaimo-0.2.3.gem (100%)
Successfully installed nanaimo-0.2.3
Fetching: colored2-3.1.2.gem (100%)
Successfully installed colored2-3.1.2
Fetching: claide-1.0.1.gem (100%)
Successfully installed claide-1.0.1
Fetching: CFPropertyList-2.3.5.gem (100%)
Successfully installed CFPropertyList-2.3.5
Fetching: xcodeproj-1.4.4.gem (100%)
Successfully installed xcodeproj-1.4.4
Fetching: ruby-macho-1.1.0.gem (100%)
Successfully installed ruby-macho-1.1.0
Fetching: nap-1.1.0.gem (100%)
Successfully installed nap-1.1.0
Fetching: molinillo-0.5.7.gem (100%)
Successfully installed molinillo-0.5.7
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: netrc-0.7.8.gem (100%)
Successfully installed netrc-0.7.8
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-downloader-1.1.3.gem (100%)
Successfully installed cocoapods-downloader-1.1.3
Fetching: cocoapods-deintegrate-1.0.1.gem (100%)
Successfully installed cocoapods-deintegrate-1.0.1
Fetching: fuzzy_match-2.0.4.gem (100%)
Successfully installed fuzzy_match-2.0.4
Fetching: thread_safe-0.3.6.gem (100%)
Successfully installed thread_safe-0.3.6
Fetching: tzinfo-1.2.3.gem (100%)
Successfully installed tzinfo-1.2.3
Fetching: i18n-0.8.1.gem (100%)
Successfully installed i18n-0.8.1
Fetching: activesupport-4.2.8.gem (100%)
Successfully installed activesupport-4.2.8
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 nanaimo-0.2.3
Installing ri documentation for nanaimo-0.2.3
Parsing documentation for colored2-3.1.2
Installing ri documentation for colored2-3.1.2
Parsing documentation for claide-1.0.1
Installing ri documentation for claide-1.0.1
Parsing documentation for CFPropertyList-2.3.5
Installing ri documentation for CFPropertyList-2.3.5
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 nap-1.1.0
Installing ri documentation for nap-1.1.0
Parsing documentation for molinillo-0.5.7
Installing ri documentation for molinillo-0.5.7
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 netrc-0.7.8
Installing ri documentation for netrc-0.7.8
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-downloader-1.1.3
Installing ri documentation for cocoapods-downloader-1.1.3
Parsing documentation for cocoapods-deintegrate-1.0.1
Installing ri documentation for cocoapods-deintegrate-1.0.1
Parsing documentation for fuzzy_match-2.0.4
Installing ri documentation for fuzzy_match-2.0.4
Parsing documentation for thread_safe-0.3.6
Installing ri documentation for thread_safe-0.3.6
Parsing documentation for tzinfo-1.2.3
Installing ri documentation for tzinfo-1.2.3
Parsing documentation for i18n-0.8.1
Installing ri documentation for i18n-0.8.1
Parsing documentation for activesupport-4.2.8
Installing ri documentation for activesupport-4.2.8
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
Done installing documentation for nanaimo, colored2, claide, CFPropertyList, xcodeproj, ruby-macho, nap, molinillo, gh_inspector, fourflusher, escape, cocoapods-try, netrc, cocoapods-trunk, cocoapods-stats, cocoapods-search, cocoapods-plugins, cocoapods-downloader, cocoapods-deintegrate, fuzzy_match, thread_safe, tzinfo, i18n, activesupport, cocoapods-core, cocoapods after 18 seconds
26 gems installed
终端输入：$ pod setup
终端输出：Setting up CocoaPods master repo
$ /usr/bin/git clone https://github.com/CocoaPods/Specs.git master --progress
Cloning into 'master'...
remote: Counting objects: 1257069, done.
remote: Compressing objects: 100% (1007/1007), done.
remote: Total 1257069 (delta 443), reused 35 (delta 35), pack-reused 1255971
Receiving objects: 100% (1257069/1257069), 396.95 MiB | 157.00 KiB/s, done.
Resolving deltas: 100% (616031/616031), done.
Checking out files: 100% (154757/154757), done.
Setup completed
4.搜索第三方库
终端输入：$ pod search AFNetworking
终端输出：