我是这样解决这个问题的:

rm -fr ~/Library/Caches/CocoaPods && \
gem update --system && \
gem update && \
gem cleanup && \
pod setup

参考:http://blog.cocoapods.org/Repairing-Our-Broken-Specs-Repository/

2019年的更新答案-可可豆荚团队转向使用他们自己的CDN来解决这个问题，这是由于GitHub速率限制，如此处所述:https://blog.cocoapods.org/CocoaPods-1.7.2/

博士TL; 你需要将Podfile中的源代码行更改为:

source 'https://cdn.cocoapods.org/'

我也有同样的问题。在运行

pod install
Setting up CocoaPods master repo

iterm2卡在了Setting up CocoaPods上。

我通过跑步解决了这个问题

sudo gem install CocoaPods

CocoaPods网站上提到了这一点

尝试清除CocoaPods缓存，重新下载并重新安装所有pod

rm -rf "${HOME}/Library/Caches/CocoaPods"

rm -rf "\`pwd\`/Pods/"

pod update

找到了另一种下载cocoapods的方法，就是下载这里提供的快照之一。它有点旧，但是.bz2压缩文件下载起来要快得多。一旦我下载了它，我将它复制到~/。cocoapods/repos/然后我使用bzip2 -dk *.bz2解压缩它。

解压缩需要一段时间，完成后，我将新解压缩文件的扩展名更改为.tar，并执行tar xvf *.tar来解压缩。这将显示正在创建的文件列表，也需要一段时间。

Finally when I ran pod repo list while inside the project folder, it showed the master folder had been added as a repo. Because I still kept getting an error that it was unable to find the specification for the pod I was looking for, I went to the master folder and did git fetch and then git merge. The git fetch took the longest, about an hour at 50 KB/s. I used fetch and merge instead of pull, as I was having issues with it, i.e. fatal: the remote end hung up unexpectedly. It is now up to date and I was able to get the pod I wanted.

截至2016年8月15日，回购是一个2.39GB的巨大文件。我打开活动监视器，看看终端在做什么。它正在下载一个巨大的文件。