cocoapods的安装
大多数iOS库都支持CocoaPods，用CocoaPods可以非常方便快捷的将效果库加入到项目中。
如果你是一名iOS开发者，那么肯定会遇到需要使用CocoaPods的场景。所以，我们来学习一下CocoaPods，看看它是怎样方便你进行项目管理的。
CocoaPods是什么：
CocoaPods是Objective-C项目的从属管理器，是库管理工具，能方便引入上千个开源库，让你的项目更加灵活。
CocoaPods官网:http://cocoapods.org/
cocoapods安装步骤
1、检查ruby 版本：ruby -v
2、如果ruby不是最新版本，将ruby更新到最新版本：gem update --system
3、验证你的Ruby镜像是并且仅是taobao，可以用以下命令查看：gem sources -l
只有在终端中出现下面文字才表明你上面的命令是成功的：
*** CURRENT SOURCES ***
https://ruby.taobao.org/
4、可能存在错误路径是：
解决办法：
4.1、移除错误路径：gem sources —remove http://ruby.taobao.org
4.2、移除错误路径：gem sources —remove http://ruby.taobao.org/
插入正确镜像路径：gem sources -ahttps://ruby.taobao.org/
5、执行安装cocoapods命令:sudo gem install cocoapods
安装正确时，会输出很多文件以及进度条，如下：
Fetching: nap-1.1.0.gem (100%)
Successfully installed nap-1.1.0
Fetching: cocoapods-core-1.0.1.gem (100%)
Successfully installed cocoapods-core-1.0.1
Fetching: claide-1.0.0.gem (100%)
Successfully installed claide-1.0.0
Fetching: cocoapods-deintegrate-1.0.0.gem (100%)
Successfully installed cocoapods-deintegrate-1.0.0
Fetching: cocoapods-downloader-1.1.0.gem (100%)
Successfully installed cocoapods-downloader-1.1.0
Fetching: cocoapods-plugins-1.0.0.gem (100%)
Successfully installed cocoapods-plugins-1.0.0
Fetching: cocoapods-search-1.0.0.gem (100%)
Successfully installed cocoapods-search-1.0.0
Fetching: cocoapods-stats-1.0.0.gem (100%)
Successfully installed cocoapods-stats-1.0.0
Fetching: cocoapods-trunk-1.0.0.gem (100%)
Successfully installed cocoapods-trunk-1.0.0
Fetching: cocoapods-try-1.1.0.gem (100%)
Successfully installed cocoapods-try-1.1.0
Fetching: molinillo-0.4.5.gem (100%)
Successfully installed molinillo-0.4.5
Fetching: xcodeproj-1.2.0.gem (100%)
Successfully installed xcodeproj-1.2.0
Fetching: fourflusher-0.3.2.gem (100%)
Successfully installed fourflusher-0.3.2
Fetching: cocoapods-1.0.1.gem (100%)
Successfully installed cocoapods-1.0.1
Fetching: concurrent-ruby-1.0.2.gem (100%)
Successfully installed concurrent-ruby-1.0.2
Parsing documentation for nap-1.1.0
Installing ri documentation for nap-1.1.0
Parsing documentation for cocoapods-core-1.0.1
Installing ri documentation for cocoapods-core-1.0.1
Parsing documentation for claide-1.0.0
Installing ri documentation for claide-1.0.0
Parsing documentation for cocoapods-deintegrate-1.0.0
Installing ri documentation for cocoapods-deintegrate-1.0.0
Parsing documentation for cocoapods-downloader-1.1.0
Installing ri documentation for cocoapods-downloader-1.1.0
Parsing documentation for cocoapods-plugins-1.0.0
Installing ri documentation for cocoapods-plugins-1.0.0
Parsing documentation for cocoapods-search-1.0.0
Installing ri documentation for cocoapods-search-1.0.0
Parsing documentation for cocoapods-stats-1.0.0
Installing ri documentation for cocoapods-stats-1.0.0
Parsing documentation for cocoapods-trunk-1.0.0
Installing ri documentation for cocoapods-trunk-1.0.0
Parsing documentation for cocoapods-try-1.1.0
Installing ri documentation for cocoapods-try-1.1.0
Parsing documentation for molinillo-0.4.5
Installing ri documentation for molinillo-0.4.5
Parsing documentation for xcodeproj-1.2.0
Installing ri documentation for xcodeproj-1.2.0
Parsing documentation for fourflusher-0.3.2
Installing ri documentation for fourflusher-0.3.2
Parsing documentation for cocoapods-1.0.1
Installing ri documentation for cocoapods-1.0.1
Parsing documentation for concurrent-ruby-1.0.2
Installing ri documentation for concurrent-ruby-1.0.2
15 gems installed
6、cocoapods安装的默认文件路径：~/.cocoapods
7、检查cocoapods是否安装正确：在终端输入pod search AFNetworking
如果cocoa pods安装正确，则会出现以下显示：
AFNetworking (3.1.0)
A delightful iOS and OS X networking framework.
pod 'AFNetworking', '~> 3.1.0'
- Homepage: https://github.com/AFNetworking/AFNetworking
- Source: https://github.com/AFNetworking/AFNetworking.git
- Versions: 3.1.0, 3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0.0, 3.0.0-beta.3,
3.0.0-beta.2, 3.0.0-beta.1, 2.6.3, 2.6.2, 2.6.1, 2.6.0, 2.5.4, 2.5.3, 2.5.2,
2.5.1, 2.5.0, 2.4.1, 2.4.0, 2.3.1, 2.3.0, 2.2.4, 2.2.3, 2.2.2, 2.2.1, 2.2.0,
2.1.0, 2.0.3, 2.0.2, 2.0.1, 2.0.0, 2.0.0-RC3, 2.0.0-RC2, 2.0.0-RC1, 1.3.4,
1.3.3, 1.3.2, 1.3.1, 1.3.0, 1.2.1, 1.2.0, 1.1.0, 1.0.1, 1.0, 1.0RC3, 1.0RC2,
1.0RC1, 0.10.1, 0.10.0, 0.9.2, 0.9.1, 0.9.0, 0.7.0, 0.5.1 [master repo]
- Subspecs:
- AFNetworking/Serialization (3.1.0)
- AFNetworking/Security (3.1.0)
- AFNetworking/Reachability (3.1.0)
- AFNetworking/NSURLSession (3.1.0)
- AFNetworking/UIKit (3.1.0)
