cocoapods问题Unable to add a source with url `https://github.com/CocoaPods/Specs.git` named `master-1`

终端中：pod install 后出现：

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`.

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

仍然不行，是由于安装多个xcode致使路径改变

解决： sudo xcode-select -switch 后面当前xcode路径

pod update --no-repo-update

pod install --verbose --no-repo-update

便可成功。