cocoaPod 安裝 Xcode->homebrew->RVM->Ruby->CocoaPods;
一：安裝RVM
1.安裝homeBrew：http://brew.sh/index_zh-cn.html
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
2.curl -L https://get.rvm.io | bash -s stable 等幾分鐘后
3.source ~/.rvm/scripts/rvm   載入 RVM 環(huán)境
4.rvm -v  檢查一下是否安裝正確

二：安裝ruby
1. rvm list known （列出已知的ruby版本）
2.rvm requirements （rvm 需要那些包）
3. rvm install 2.3.3
4. rvm 2.3.3 --default
5. ruby -v （查看版本）

三：Gem 換ruby-china
1.gem sources -l
2. gem sources --remove XXX
3. gem sources -a https://gems.ruby-china.org

四：安裝cocoapods
1. gem -v (查看版本)
2. sudo gem update --system 
3. sudo gem install -n /usr/local/bin cocoapods
4.配置git config：git config --global http.postBuffer 536870912  （500M）
5. git clone https://coding.net/u/hging/p/Specs/git ~/.cocoapods/repos/master  （經(jīng)歷過多次報錯直接用改方法, `https://coding.net/u/hging/p/Specs/git`已經(jīng)不更新了所以試下`https://github.com/CocoaPods/Specs.git`）
6.pod setup (或者執(zhí)行$ pod repo update $ pod repo)

五：常見的報錯
報錯1
[!] /usr/bin/git clone https://github.com/CocoaPods/Specs.git master

Cloning into 'master'...
error: RPC failed; curl 56 SSLRead() return error -36
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
解決：sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

報錯2
[!] /usr/bin/git clone https://github.com/CocoaPods/Specs.git master

Cloning into 'master'...
error: RPC failed; curl 56 SSLRead() return error -9806
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
報錯3
[!] /usr/bin/git clone https://github.com/CocoaPods/Specs.git master

Cloning into 'master'...
error: RPC failed; curl 18 transfer closed with outstanding read data remaining
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed

解決：報錯2和報錯3 到現(xiàn)在沒有找到特別好的方法，只能 走git clone https://coding.net/u/hging/p/Specs/git ~/.cocoapods/repos/master 然后再pod setup


報錯4: rvm install 2.3.0 ：
Error: /usr/local/opt/readline is not a valid keg

Requirements installation failed with status: 1.

 解決：rvm autolibs read-only # read more here:https://rvm.io/rvm/autolibs

rvm install ruby


報錯5: Error running '__rvm_make -j 1',

please read /Users/ikuan/.rvm/log/1504160588_ruby-2.4.1/make.log

There has been an error while running make. Halting the installation.

解決：存在多個xcode弄痹， xcode-select —install ，后面會彈出一個頁面點擊安裝。



報錯6. sudo gem update —system

ERROR:  Loading command: update (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NoMethodError)
解決：brew install homebrew/dupes/zlib

關(guān)于1.2.11，我們可以進入/usr/local/Cellar/zlib文件夾后可以查看到
rvm reinstall 2.3.3 --with-zlib-dir=/usr/local/Cellar/zlib/1.2.11

報錯7.
[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down


sudo rm -fr ~/.cocoapods/repos/master
git clone https://coding.net/u/hging/p/Specs/git ~/.cocoapods/repos/master
pod setup(或者執(zhí)行$ pod repo update $ pod repo)