问题是你没有安装命令行工具，我相信。 尝试在终端运行:

sudo gem update --system

然后从苹果下载命令行工具 只需搜索“命令行工具”并下载适合您的操作系统的版本。 一旦你安装了它，在终端运行:

sudo gem install cocoapods
pod setup

以上这些对我都不起作用，所以下面的方法起作用了:

pod setup
Ctrl +C
pod repo remove master
cd ~/.cocoapods/repos 
git clone https://github.com/CocoaPods/Specs master

一旦完成，它就起作用了。

干杯!

从cocoapods 1.7.2开始，你可以使用cdn而不是github。它燃烧得很快，挂不起来。从cocopods 1.8.0开始，cdn是默认的。

To use the CDN source in your Podfile: If you don't have private specs: source 'https://cdn.cocoapods.org/' If you have private specs: source 'https://github.com/artsy/Specs.git' - source 'https://github.com/CocoaPods/Specs.git' + source 'https://cdn.cocoapods.org/' Doing this will break your Podfile.lock, so you are likely to need to run pod update to see the changes (be careful, this may update your Pods also). If you have a CI setup, it is recommended to cache the new repo dir as it is very small and would save even more time. With 1.7.2 it should be located at ~/.cocoapods/repos/cocoapods- (yes, with a -), but we're looking to improve the naming in an upcoming release.

更多信息:

CocoaPods 1.7.2 -主Repo CDN完成! CocoaPods 1.8测试版来了!

上面的解决方案都不适合我，我不得不卸载coacoapods，然后安装一个特定的版本，然后一切才适合我

sudo gem uninstall cocoapods

然后

sudo gem install cocoapods -v 1.7.5

现在，即使是冗长也显示了进步

$ pod setup --verbose

Setting up CocoaPods master repo

Cloning spec repo `master` from `https://github.com/CocoaPods/Specs.git` (branch `master`)
  $ /usr/bin/git clone https://github.com/CocoaPods/Specs.git --progress -- master
  Cloning into 'master'...
  remote: Enumerating objects: 295, done.        
  remote: Counting objects: 100% (295/295), done.        
  remote: Compressing objects: 100% (283/283), done.        
  Receiving objects:  20% (744493/3722462), 132.93 MiB | 567.00 KiB/s   

我也有同样的问题。我必须使用下面的命令来解决它。

git clone `https://github.com/CocoaPods/Specs.git ~/.cocoapods/repos/master`

我正在使用监控下载进度

while true; 
do   
du -sh ~/.cocoapods/;   
sleep 3; 
done

进展非常缓慢……失败了几次。 但是在使用命令行git config——global http增加了git缓冲区限制之后。下载速度大大提高，在./cocoapods文件夹上下载了总共347 Mb后，进度似乎停止了，网络活动也停止了。 但在等待几分钟后，发现cocoapod正在验证和提取回购，使总大小达到853 Mb。

注:2016年10月23日。