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$sudo gem -v

$gem update --system

$ gem sources -l

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

$ gem sources --add https://gems.ruby-china.org

执行完上面的这个命令记得 执行

$ sudo gem update --system

否则会报错

ERROR:  While executing gem ... (OpenSSL::SSL::SSLError)    hostname "gems.ruby-china.org" does not match the server certificate

$ sudo gem install -n /usr/local/bin cocoapods --pre

用上面这个命令执行安装  否则会报错

ERROR:  While executing gem ... (Errno::EPERM)     Operation not permitted - /usr/bin/xcodeproject

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！

pod search afn 报错

[!] Unable to find a pod with name, author, summary, or description matching `afn`

执行命令：

$ rm ~/Library/Caches/CocoaPods/search_index.json

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