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解决办法：删除阿里包
3:iOS开发时，多人协作上传下载代码，cocoapods不断更新，非常容易报错Duplicate Symbols for Architecture...,表面意思是工程中有相同的文件。
Step 1: Go to TARGETS -> Build Settings -> No Common Blocks -> No
Step 2: Go to TARGETS -> Build Settings -> enable testability -> No
4:master分支
$ cd~/.cocoapods/repos
$ pod repo remove master
$ git clone https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git master
5:Unable to add a source with url `https://cdn.cocoapods.org/` named `trunk`.
pod repo add-cdn trunk https://cdn.cocoapods.org/
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