没次升级xcode 终端命令打包的时候都会报错：
xcrun: error: unable to find utility "PackageApplication", not a developer tool or in PATH
原因是缺少了PackageApplication，据说在8.3版本彻底移除了
先去找个旧版的Xcode里面copy一份过来，放到下面这个目录：
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/
然后执行命令
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer/
chmod +x /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/PackageApplication
最后附上PackageApplication下载地址:
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