$ sudo gem install cocoapods
$ pod search 查找的库
$ vim Podfile
$ pod install
$ pod update
$ which pod "检查pod是否安装成功"
$ touch Podfile "创建Podfile"
gem sources --remove https://rubygems.org/
gem sources -a https://ruby.taobao.org/
gem sources -l
Unable to find a specification for xxxxx
清理pod
pod repo remove master
pod setup
