CocoaPods 的安装和更新流程

Mac  OS本身自带Ruby，但还是更新一下保险，因为我第一次安装在没有更新Ruby的情况下就失败了。需要ruby版本大于等于2.2.2，

所以需要对Ruby进行升级。这里使用RVM对Ruby进行升级，升级过程如下：

安装 RVM

RVM:Ruby Version Manager,Ruby版本管理器，包括Ruby的版本管理和Gem库管理(gemset)

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

等待一段时间后就可以成功安装好 RVM。

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1. $ source ~/.bashrc  
2. $ source ~/.bash_profile  

测试是否安装正常

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1. rvm -v  

用RVM升级Ruby

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1. #查看当前ruby版本  
2. $ ruby -v  
3. ruby 1.8.7  
4. #列出已知的ruby版本  
5. $ rvm list known  
6. #安装ruby 1.9.3  
7. $ rvm install 1.9.3  

安装完成之后ruby -v查看是否安装成功

下面就更新ruby源和安装cocoapods：

1.移除现有Ruby默认源

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

2.使用新的源

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

3.验证新源是否替换成功

$gem sources -l

4.安装CocoaPods

(1)  $sudo gem install cocoapods 备注：苹果系统升级 OS X EL Capitan 后改为 $sudo gem install -n /usr/local/bin cocoapods

(2)  $pod setup

5.更新gem

$sudo gem update --system

6.  新建工程，并在终端用cd指令到文件夹内

$pod search 第三方

7.新建文件 vim “Podfile”，

$vim Podfile

写入以下内容并保存 小提示：（终端vim文件 按 i 可编辑 ，esc 退出编辑，：wq  可保存退出）

platform:ios, '6.0'   

pod 'FastImageCahe', '~> 1.3'     <-------第三方

8.导入第三方库

$pod install

9.退出终端

参考：

1、http://blog.csdn.net/meegomeego/article/details/24005567

2 、http://code4app.com/article/cocoapods-install-usage

3、http://cocoapods.org/

更新cocoapods 1.0：

ios git:(master)✗ pod install     

log：

 iosgit:(master)✗ pod install          

[!] Unable to load a specification for the plugin `/Library/Ruby/Gems/2.0.0/gems/cocoapods-deintegrate-1.0.0`

Updating local specs repositories

[!] The `master` repo requires CocoaPods 1.0.0 -  (currently using 0.39.0)

Update CocoaPods, or checkout the appropriate tag in the repo.

ios git:(master)✗ pod --version

0.39.0

ios git:(master)✗ sudo gem update --system （更新gem）

Updating rubygems-update

Fetching: rubygems-update-2.6.7.gem (100%)

ERROR:  While executing gem ... (Errno::EPERM)

    Operation not permitted - /usr/bin/update_rubygems

➜  iosgit:(master)✗ gem sources --remove https://rubygems.org

source https://rubygems.org not present in cache

➜  iosgit:(master)✗ gem sources --a https://ruby.taobao.org

https://ruby.taobao.org added to sources

➜  iosgit:(master)✗ gem sources -l                         

*** CURRENT SOURCES ***

https://ruby.taobao.org/

➜  iosgit:(master)✗ sudo gem install cocoapods

ERROR:  While executing gem ... (Errno::EPERM)

    Operation not permitted - /usr/bin/xcodeproj

➜  iosgit:(master)✗ sudo gem install -n /usr/local/bin cocoapods

Successfully installed xcodeproj-1.4.2

Fetching: molinillo-0.5.4.gem (100%)

Successfully installed molinillo-0.5.4

Fetching: gh_inspector-1.0.2.gem (100%)

Successfully installed gh_inspector-1.0.2

Fetching: fourflusher-2.0.1.gem (100%)

Successfully installed fourflusher-2.0.1

Fetching: cocoapods-trunk-1.1.2.gem (100%)

Successfully installed cocoapods-trunk-1.1.2

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: cocoapods-core-1.1.1.gem (100%)

Successfully installed cocoapods-core-1.1.1

Fetching: cocoapods-1.1.1.gem (100%)

Successfully installed cocoapods-1.1.1

Parsing documentation for xcodeproj-1.4.2

Installing ri documentation for xcodeproj-1.4.2

Parsing documentation for molinillo-0.5.4

Installing ri documentation for molinillo-0.5.4

Parsing documentation for gh_inspector-1.0.2

Installing ri documentation for gh_inspector-1.0.2

Parsing documentation for fourflusher-2.0.1

Installing ri documentation for fourflusher-2.0.1

Parsing documentation for cocoapods-trunk-1.1.2

Installing ri documentation for cocoapods-trunk-1.1.2

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 cocoapods-core-1.1.1

Installing ri documentation for cocoapods-core-1.1.1

Parsing documentation for cocoapods-1.1.1

Installing ri documentation for cocoapods-1.1.1

9 gems installed

➜  iosgit:(master)✗ pod --version

1.1.1

更新cocoapods成功

新版本CocoaPods强制要求Podfile必须指明target，否则报错，Podfile内容修改为：

target 'Metropolis' do  platform :ios, '8.0'  use_frameworks!  #pod 'RxSwift',  '~>2.5'  pod 'RxCocoa', '~> 2.5.0'  pod 'SnapKit', '~> 0.30.0.beta1'   end