pod update出现:
[!] Unable to add a source with url https://github.com/CocoaPods/Specs.git named master-1.
You can try adding it manually in ~/.cocoapods/repos or via pod repo add.
这样的提示。
解决办法:由于装了多个Xcode,在终端输入:sudo xcode-select -switch /Applications/Xcode.app