iOS - 解决Unable to add a source with url `https://github.com/CocoaPods/Specs.git` named

[!] Unable to add a source with url `https://github.com/CocoaPods/Specs.git` named `master`.
You can try adding it manually in `~/.cocoapods/repos` or via `pod repo add`.

解决方案：

pod repo add master https://github.com/CocoaPods/Specs.git

然后提示执行’pod setup’，如果出现

[!] The `master` repo is not a git repo.

进入/users/你的用户名/.cocoapods/repos，删除master文件夹
然后执行

pod setup

如果是安装多个Xcdoe，还需要选择Xcode的路径

sudo xcode-select -switch /Applications/Xcode.app/

在终端里输入下方命令可以知道Xcode的路径：

xcode-select -p