/Users/mac/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:308:in `to_specs': Could not find 'cocoapods' (>= 0) among 19 total gem(s) (Gem::MissingSpecError)

Checked in 'GEM_PATH=/Users/mac/.rvm/gems/ruby-2.2.0:/Users/mac/.rvm/gems/ruby-2.2.0@global', execute `gem env` for more information

from /Users/mac/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:320:in `to_spec'

from /Users/mac/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:65:in `gem'

from /usr/local/bin/pod:22:in `'

from /Users/mac/.rvm/gems/ruby-2.2.0@global/bin/ruby_executable_hooks:15:in `eval'

from /Users/mac/.rvm/gems/ruby-2.2.0@global/bin/ruby_executable_hooks:15:in `'解决：安装最新的ruby运行这些命令

rvm install 2.2

rvm use 2.2

rvm use 2.2.4 --default //!设置2.2.4为运行的默认版本!

一旦安装在您的系统中，请执行以下步骤

sudo gem install activesupport -v 4.2.6

sudo gem install cocoapods

//重新启动终端

pod setup