CocoaPods安装

1.下载安装CocoaPods

sudo gem install -n /usr/local/bin cocoapods

2.安装Pods

pod setup

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安装前确保ruby版本不过低，可以更新一下ruby

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移除旧版CocoaPods

sudo gem uninstall -n /usr/local/bin cocoapods-core

2.升级CocoaPods

sudo gem install -n /usr/local/bin cocoapods --pre