sudo rm -rf /Applications/Xcode.app
sudo rm -rf /Library/Preferences/com.apple.dt.Xcode.plist
rm -rf ~/Library/Preferences/com.apple.dt.Xcode.plist
rm -rf ~/Library/Caches/com.apple.dt.Xcode
rm -rf ~/Library/Application\ Support/Xcode
rm -rf ~/Library/Developer/Xcode
rm -rf ~/Library/Developer/CoreSimulator
rm -rf ~/Library/Developer/XCPGDevices
AppStore直接下载安装
开发者官网(More Downloads for Apple Developers):
https://developer.apple.com/download/more/
libstdc++库问题处理：
https://github.com/devdawei/libstdc-
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