cocoapods 更新失敗（持續更新中）

• 問題2：

  ERROR:  While executing gem ... (Errno::EPERM)
  Operation not permitted - /usr/bin/pod

  解決辦法：
  $:sudo gem install -n /usr/local/bin cocoapods –pre

• 問題1：

  gongmengnandeMacBook-Pro: name$ sudo gem install cocoapods
  ERROR:  Could not find a valid gem 'cocoapods' (>= 0), here is why:
        Unable to download data from http://ruby.taobao.org/ - bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz)
  gongmengnandeMacBook-Pro: name$ sudo gem update --system
  ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
  bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz)

  解決辦法：換源地址（這是https的問題）

  1. gem sources –remove http://ruby.taobao.org/ //移除原文件地址
  2. gem sources -a https://ruby.taobao.org/ //添加新文件地址
  3. gem sources -l //查看源文件地址是否正確
  4. sudo gem install cocoapods //安裝 假如你已經安裝了就可以使用更新語句（sudo gem update –system）