最近刚换了台电脑。。。 枯燥的搭环境呀。一坑接着一坑😭、、、废话不多说啦，直接进入主题、由于淘宝的那个镜像(https://ruby.taobao.org/ )已经不不在提供更新了了。官方的需要FQ。所以我们现在用最新支持的ruby镜像(https://gems.ruby-china.org/)、安装方法有两种、建议使用翻墙。没那么多事，不过要等的有点久。。。可以参考这里 http://www.cnblogs.com/yan520/p/5583362.html
我用的是非翻墙的方法进行安装的
在装cocoa pods 时 终端输入命令
sudo gem install cocoapods
完事总是报错提示
Password:
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/xcodeproj
困扰了许久呀。 今天终于得到完美解决啦、、、
只需在终端 将命令 sudo gem install cocoapods 更换为
sudo gem install -n /usr/local/bin cocoapods --pre
Successfully installed xcodeproj-1.4.2 即可完美解决！！！！

第二种方法具体安装步骤
安装cocoapods的步骤为：

1、更新ruby

sudo gem update --system
2、
更换Ruby镜像－－淘宝的那个镜像(https://ruby.taobao.org/ )已经不可用了。官方的需要FQ。所以我们现在用最新支持的ruby镜像(https://gems.ruby-china.org/)

需要的命令行：

gem sources --remove https://rubygems.org/
gem sources -a https://gems.ruby-china.org/
gem sources -l （用来检查使用替换镜像位置成功）

出现

*** CURRENT SOURCES ***

https://gems.ruby-china.org/

则说明成功了

3、安装cocoapods 命令行： sudo gem install -n /usr/local/bin cocoapods --pre

终端打印：

MacintoshdeiMac:~ Mac$ sudo gem install -n /usr/local/bin cocoapods --pre
ERROR: SSL verification error at depth 1: unable to get local issuer certificate (20)
ERROR: You must add /O=Digital Signature Trust Co./CN=DST Root CA X3 to your local trusted store
ERROR: SSL verification error at depth 2: self signed certificate in certificate chain (19)
ERROR: Root certificate is not trusted (/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA)
Successfully installed xcodeproj-1.4.2
Fetching: ruby-macho-0.2.6.gem (100%)
Successfully installed ruby-macho-0.2.6
Fetching: nap-1.1.0.gem (100%)
Successfully installed nap-1.1.0
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: 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-1.1.2.gem (100%)
Successfully installed cocoapods-trunk-1.1.2
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: cocoapods-core-1.2.0.beta.1.gem (100%)
Successfully installed cocoapods-core-1.2.0.beta.1
Fetching: cocoapods-1.2.0.beta.1.gem (100%)
Successfully installed cocoapods-1.2.0.beta.1
Parsing documentation for xcodeproj-1.4.2
Installing ri documentation for xcodeproj-1.4.2
Parsing documentation for ruby-macho-0.2.6
Installing ri documentation for ruby-macho-0.2.6
Parsing documentation for nap-1.1.0
Installing ri documentation for nap-1.1.0
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 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-1.1.2
Installing ri documentation for cocoapods-trunk-1.1.2
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 cocoapods-core-1.2.0.beta.1
Installing ri documentation for cocoapods-core-1.2.0.beta.1
Parsing documentation for cocoapods-1.2.0.beta.1
Installing ri documentation for cocoapods-1.2.0.beta.1
18 gems installed
到此安装成功！