While executing gem ... (Gem::FilePermissionError)

最近在使用pod install命令时一直报错：

ERROR:  While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /usr/bin directory.
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错误信息显示权限不够，好吧，修改权限

sudo gem install cocoapods --pre
sudo chmod 777 /Library/Ruby/Gems/2.3.0
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试试证明以上命令均无效： 最后使用一下命令安装成功

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

pod install
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成功执行

Analyzing dependencies
Downloading dependencies
Installing SDWebImage (4.3.3)
Generating Pods project
Integrating client project

[!] Please close any current Xcode sessions and use `MainProject.xcworkspace` for this project from now on.
Sending stats
Pod installation complete! There is 1 dependency from the Podfile and 1 total pod installed.
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