CocoaPod的安装

更新以前大家都是根据淘宝镜像来安装cocoapods，此篇文章也和大多数博文内容相仿。后来换电脑时，同事说淘宝镜像已经不能用了，网上又重新查看教程，确实都是这么说的！（好吧，我确实比较懒，都没有按照之前步骤去试一下）

1.有人说需要升级ruby

参考链接：爱敲代码的兔子---> iOS极速安装CocoaPods详细教程 

gem update --system  ===> ERROR

详细信息如下：

Updating rubygems-update

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

Successfully installed rubygems-update-2.6.7

Parsing documentation for rubygems-update-2.6.7

Installing ri documentation for rubygems-update-2.6.7

Installing darkfish documentation for rubygems-update-2.6.7

Parsing documentation for rubygems-update-2.6.7

Installing RubyGems 2.6.7

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

    Permission denied - /Library/Ruby/Site/2.0.0/rubygems/basic_specification.rb

或者 sudo gem update --system  ===> ERROR

详细信息如下：

Updating rubygems-update

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

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

    Operation not permitted - /usr/bin/update_rubygems

bobbobbob:~ apple$ sudo gem update --system

Updating rubygems-update

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

    Operation not permitted - /usr/bin/update_rubygems

2.解决上述Operation not permitted ,使用sudo gem install -n /usr/local/bin cocoapods ===> ERROR

参考链接：http://stackoverflow.com/questions/30812777/cannot-install-cocoa-pods-after-uninstalling-results-in-error/30851030#30851030

详细信息如下：

Successfully installed xcodeproj-1.4.2

Fetching: ruby-macho-0.2.6.gem (100%)

Successfully installed ruby-macho-0.2.6

Fetching: molinillo-0.5.7.gem (100%)

Successfully installed molinillo-0.5.7

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-core-1.2.0.gem (100%)

Successfully installed cocoapods-core-1.2.0

Fetching: cocoapods-1.2.0.gem (100%)

ERROR:  While executing gem ... (TypeError)

    no implicit conversion of nil into String

看到Successfully还是比较窃喜的，后面出现ERROR是什么鬼（一脸萌比）。

3.解决上述no implicit conversion of nil into String，使用sudo gem install cocoapods --pre ===> ERROR

详细信息如下

Fetching: colored2-3.1.2.gem (100%)

Successfully installed colored2-3.1.2

Fetching: cocoapods-core-1.2.1.beta.1.gem (100%)

Successfully installed cocoapods-core-1.2.1.beta.1

Fetching: cocoapods-1.2.1.beta.1.gem (100%)

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

    Operation not permitted - /usr/bin/pod

当然，我还自己组合命令sudo gem install -n /usr/bin/pod cocoapods --pre，必然还是失败（捂脸，我对这些命令真的一窍不通，有时间再学习），ERROR同第2个类似，索性我不玩了！

虽然升级Ruby失败，但是后来直接按照下面的步骤，竟然也能安装成功。

• 1.移除原ruby镜像源

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

• 2.新增镜像源

gem sources -a https://gems.ruby-china.org/

• 3.查看你的Ruby镜像

gem sources -l

终端出现如下图所示，第三步成功

4.看来Ruby版本还可以，镜像安装成功。

小插曲：此时我以为cocoapods已安装，就使用 pod install ,详细信息如下：

/Library/Ruby/Site/2.0.0/rubygems.rb:254:in `bin_path': can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)

from /usr/local/bin/pod:22:in `<main>'

5.如果之前安装过cocoapods，使用sudo gem uninstall cocoapods

6.安装cocoapods，使用gem install cocoapods

小插曲：此时我想cocoapods已安装，就使用 pod install ,详细信息如下：

[!] No `Podfile' found in the project directory.

原因：笨啊，没有Podfile文件啊。

7.如何使用将会在下一篇文章中详细介绍。