我的用的是ruby-china的源 gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/
开始安装：
sudo gem install -n /usr/local/bin cocoapods
然后告诉我 ruby的版本必须 >=2.2.2 当前版本为 ruby 2.0.0p648
安装ruby一般都是通过rbnv或rvm来安装，但是要按这俩必须安装homebrew ，接下来安装brew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
It appears Homebrew is already installed. If your intent is to reinstall you
should do the following before running this installer again:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"
The current contents of /usr/local are .git .github .gitignore
根据提示尝试删除brew重新安装
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"
删除失败，没有访问这些目录的权限
The following possible Homebrew files were not deleted:
/usr/local/.DS_Store
/usr/local/.git/
/usr/local/.github/
You may consider to remove them by yourself.
You may want to restore /usr/local's original permissions
sudo chmod 0755 /usr/local
sudo chown root:wheel /usr/local
再三尝试无果，只好手动删除这三个目录
irondeMacBook-Pro:~ IRON$ sudo rm -rf /usr/local/.DS_Store
irondeMacBook-Pro:~ IRON$ sudo rm -rf /usr/local/.git
irondeMacBook-Pro:~ IRON$ sudo rm -rf /usr/local/.github
之后安装成功
按照ruby-chain的教程 如何快速正确的安装 Ruby, Rails 运行环境
接下来,安装这三个东西
brew install libxml2
brew install libxslt
brew install homebrew/dupes/libiconv
然后
$gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
$\curl -sSL https://get.rvm.io | bash -s stable
$source~/.bashrc
$source~/.bash_profile
检查一下 rvm -v ，成功。
接下来，用rvm，安装ruby
rvm requirements
rvm install 2.3.0
rvm use 2.3.0 --default
进行检测
ruby -v
gem -v
安装 Bundler
gem install bundler
安装rails
gem install rails
测试 rails -v
接上续，pod setup仍然有问题出现
这个错误应该是是网络原因
修改git的默认postBuffer即可 git config --global http.postBuffer 24288000
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