我从swift.org阅读了有关Swift5.1的文档，并对枚举中的访问级别有一些疑问。https://docs.swift.org/swift-book/LanguageGuide/AccessControl.html#ID14在文档中，它说:Theindividualcasesofanenumerationautomaticallyreceivethesameaccesslevelastheenumerationtheybelongto.privateenumSomePrivateEnum{caseonecasetwocasethree}privateclassSomePrivat