1.在升级到Xcode8之后Cocoapods管理第三方库的时候，不报错，但是却没安装成功，这个时候你就要查看当前的ruby版本，Xcode8必须要要ruby 2.2.0以上才可以。
2.$ ruby -v 查看当前版本，我的当时是2.0.0，明显小于Cocoapods的最低要求。
3.首先要更新Ruby , 有三种选择
1.下载ruby源代码，编译，安装
2.使用发行版自带的安装包，安装
3.使用 rvm安装
我选择了 rvm安装, 那势必得先安装 rvm
1.RVM:Ruby Version Manager,Ruby版本管理器，包括Ruby的版本管理和Gem库管理(gems)
$ curl -L get.rvm.io | bash -s stable
2.加载文件, 测试是否安装正常(按照提示操作)
$ source ~/.bashrc
$ source ~/.bash_profile
$ source ~/.profile$ rvm -v
3.如果有下面的提示, 请reload rvm
A RVM version 1.27.0 (latest) is installed yet 1.25.23 (stable) is loaded.
Please do one of the following:
'rvm reload'
open a new shell
'echo rvm_auto_reload_flag=1 >> ~/.rvmrc' # for auto reload with msg.
'echo rvm_auto_reload_flag=2 >> ~/.rvmrc' # for silent auto reload.
输入命令:
$ rvm reload
$ rvm -v
4.查看当前ruby版本 ,获取rvm 列表
$ ruby -v
$ rvm list known
5.安装ruby可能出的错误 (若未出错, 请跳过进入第6步)
ERROR: While executing gem ... (Gem::Exception)
Unable to require openssl, install OpenSSL and rebuild ruby (preferred) or use non-HTTPS sources
这个时候你就要更改淘宝镜像源
$ rvm install 2.4.0
6.ruby -v 查看当前镜像版本号
-
gem sources 如果出现如下结果
屏幕快照 2017-01-16 下午3.43.35.png
标识更换成功。
8.执行 sudo gem install cocoapods --pre 即可
Password:
Fetching: thread_safe-0.3.5.gem (100%)
Successfully installed thread_safe-0.3.5
Fetching: tzinfo-1.2.2.gem (100%)
Successfully installed tzinfo-1.2.2
Fetching: concurrent-ruby-1.0.4.gem (100%)
Successfully installed concurrent-ruby-1.0.4
Fetching: i18n-0.7.0.gem (100%)
Successfully installed i18n-0.7.0
Fetching: json-1.8.6.gem (100%)
Building native extensions. This could take a while...
Successfully installed json-1.8.6
Fetching: activesupport-4.2.7.1.gem (100%)
Successfully installed activesupport-4.2.7.1
Fetching: nap-1.1.0.gem (100%)
Successfully installed nap-1.1.0
Fetching: fuzzy_match-2.0.4.gem (100%)
Successfully installed fuzzy_match-2.0.4
Fetching: cocoapods-core-1.2.0.rc.1.gem (100%)
Successfully installed cocoapods-core-1.2.0.rc.1
Fetching: claide-1.0.1.gem (100%)
Successfully installed claide-1.0.1
Fetching: cocoapods-deintegrate-1.0.1.gem (100%)
Successfully installed cocoapods-deintegrate-1.0.1
Fetching: cocoapods-downloader-1.1.3.gem (100%)
Successfully installed cocoapods-downloader-1.1.3
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: 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-try-1.1.0.gem (100%)
Successfully installed cocoapods-try-1.1.0
Fetching: molinillo-0.5.5.gem (100%)
Successfully installed molinillo-0.5.5
Fetching: CFPropertyList-2.3.4.gem (100%)
Successfully installed CFPropertyList-2.3.4
Fetching: colored-1.2.gem (100%)
Successfully installed colored-1.2
Fetching: nanaimo-0.2.3.gem (100%)
Successfully installed nanaimo-0.2.3
Fetching: xcodeproj-1.4.2.gem (100%)
Successfully installed xcodeproj-1.4.2
Fetching: escape-0.0.4.gem (100%)
Successfully installed escape-0.0.4
Fetching: fourflusher-2.0.1.gem (100%)
Successfully installed fourflusher-2.0.1
Fetching: gh_inspector-1.0.3.gem (100%)
Successfully installed gh_inspector-1.0.3
Fetching: ruby-macho-0.2.6.gem (100%)
Successfully installed ruby-macho-0.2.6
Fetching: cocoapods-1.2.0.rc.1.gem (100%)
Successfully installed cocoapods-1.2.0.rc.1
Parsing documentation for thread_safe-0.3.5
Installing ri documentation for thread_safe-0.3.5
Parsing documentation for tzinfo-1.2.2
Installing ri documentation for tzinfo-1.2.2
Parsing documentation for concurrent-ruby-1.0.4
Installing ri documentation for concurrent-ruby-1.0.4
Parsing documentation for i18n-0.7.0
Installing ri documentation for i18n-0.7.0
Parsing documentation for json-1.8.6
Installing ri documentation for json-1.8.6
Parsing documentation for activesupport-4.2.7.1
Installing ri documentation for activesupport-4.2.7.1
Parsing documentation for nap-1.1.0
Installing ri documentation for nap-1.1.0
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.rc.1
Installing ri documentation for cocoapods-core-1.2.0.rc.1
Parsing documentation for claide-1.0.1
Installing ri documentation for claide-1.0.1
Parsing documentation for cocoapods-deintegrate-1.0.1
Installing ri documentation for cocoapods-deintegrate-1.0.1
Parsing documentation for cocoapods-downloader-1.1.3
Installing ri documentation for cocoapods-downloader-1.1.3
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 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-try-1.1.0
Installing ri documentation for cocoapods-try-1.1.0
Parsing documentation for molinillo-0.5.5
Installing ri documentation for molinillo-0.5.5
Parsing documentation for CFPropertyList-2.3.4
Installing ri documentation for CFPropertyList-2.3.4
Parsing documentation for colored-1.2
Installing ri documentation for colored-1.2
Parsing documentation for nanaimo-0.2.3
Installing ri documentation for nanaimo-0.2.3
Parsing documentation for xcodeproj-1.4.2
Installing ri documentation for xcodeproj-1.4.2
Parsing documentation for escape-0.0.4
Installing ri documentation for escape-0.0.4
Parsing documentation for fourflusher-2.0.1
Installing ri documentation for fourflusher-2.0.1
Parsing documentation for gh_inspector-1.0.3
Installing ri documentation for gh_inspector-1.0.3
Parsing documentation for ruby-macho-0.2.6
Installing ri documentation for ruby-macho-0.2.6
Parsing documentation for cocoapods-1.2.0.rc.1
Installing ri documentation for cocoapods-1.2.0.rc.1
Done installing documentation for thread_safe, tzinfo, concurrent-ruby, i18n, json, activesupport, nap, fuzzy_match, cocoapods-core, claide, cocoapods-deintegrate, cocoapods-downloader, cocoapods-plugins, cocoapods-search, cocoapods-stats, netrc, cocoapods-trunk, cocoapods-try, molinillo, CFPropertyList, colored, nanaimo, xcodeproj, escape, fourflusher, gh_inspector, ruby-macho, cocoapods after 27 seconds
28 gems installed
表示安装成功
1.更换ruby镜像
gem sources -l //（用来检查使用替换镜像位置成功）查看当前镜像
gem sources --remove https://ruby.taobao.org/
gem sources -a http://rubygems.org/
2.下载安装CocoaPods
终端输入：
sudo gem install cocoapods
pod setup
3.使用CocoaPods
cd到项目总目录
$ vim Podfile
然后在Podfile文件中输入以下文字：
platform :ios, '8.0'
target "targetName" do
pod 'AFNetworking'
end
然后按Esc，并且输入“：”号进入vim命令模式，然后在冒号后边输入wq
确定终端cd到项目总目录，然后输入 pod install （安装第三库）
终端输入命令：pod search UI （搜索第三库）
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