好久没弄过iOS了最近游戏要接个SDK，要用CocoaPods 之前没记录下这次记录一下
CocoaPods 安装
1. 查看源
gem sources -l //查看ruby源
默认显示：
hawk-ipv6:~ mac$ gem sources -l
*** CURRENT SOURCES ***
https://rubygems.org/
2. ruby源在墙内是访问不到的,需要置换为国内（之前一直用淘宝的但现在不更新了，用另一个）
gem source -a https://gems.ruby-china.org
显示：
hawk-ipv6:~ mac$ gem source -a https://gems.ruby-china.org
Error fetching https://gems.ruby-china.org:
bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)
我们在浏览器打开（https://gems.ruby-china.org
官方显示
服务域名更换公告
因域名备案问题，.org 域名无法继续提供 RubyGems 镜像服务，我们提供 .com 代替 .org 的域名，其他一切不变！！
详情访问
https://gems.ruby-china.com
如有其他疑问，请在 Ruby China 联系。
so, 我们换成官方提示的源地址
gem source -a https://gems.ruby-china.org
OK 再次查看源
gem sources -l
显示：
gem sources -l
*** CURRENT SOURCES ***
https://rubygems.org/
https://gems.ruby-china.com
3. 升级Gem（ruby管理包的命令工具） ，防止安装出现因版本低的错误
sudo gem update --system //升级gem
gem -v //查看版本
4. 安装 CocoaPods
sudo gem install cocoapods
显示报错:
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /usr/bin directory.
更改权限:
sudo chmod 777 /usr/bin
chmod: Unable to change file mode on /usr/bin: Operation not permitted
擦嘞不让改 百度用了另一条命令
sudo gem install cocoapods -n /usr/local/bin
显示 安装成功
Done installing documentation for xcodeproj, molinillo, cocoapods-try, netrc, cocoapods-trunk, cocoapods-stats, cocoapods-search, cocoapods-plugins, cocoapods-downloader, cocoapods-deintegrate, fuzzy_match, cocoapods-core, cocoapods after 8 seconds
13 gems installed
然后 搞去吧
