pod install报错：
# [cocoapods问题Unable to add a source with url `https://github.com/CocoaPods/Specs.git` named `master-1`](https://my.oschina.net/u/2532095/blog/753609)
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，是因为安装多个xcode导致路径改变
解决： sudo xcode-select -switch 后面当前xcode路径
确保~/.cocoapods/repos下面已经有了你的repo，绕过检查：
pod update --no-repo-update
pod install --verbose --no-repo-update
即可成功。
