英文:
Why do memberwise initializers become 'private' when the structure contains a private property?
问题
默认情况下，结构类型的成员逐一初始化器被视为私有，如果结构的任何存储属性都是私有的。对于自定义初始化器是否也适用相同规则，我无法提供答案。
英文:
> The default memberwise initializer for a structure type is considered private if any of the structure’s stored properties are private.
(Source: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/accesscontrol/)
What is the reason as to why the memberwise initializer becomes 'private' when a stored property is 'private'?
And is there a reason why the same does not apply for custom initializers?
答案1
得分: 2
"否则，如果编译器生成了一个公共成员智能初始化方法，它就会否定我们保持属性私有的意图。至于自定义初始化方法，那么允许属性从自定义类型外部进行初始化是我们的选择。" (@joakimdanielson)
还有来自Swift论坛的信息：
来自Hacking With Swift论坛的另一种（可能的）解释：
英文:
"Because otherwise the compiler would overrule our intention to keep the property private if it synthesized a public member wise init. As for a custom init, well then it is our choice to allow the property to be initialized from outside of our custom type." (@joakimdanielson)
Also from Swift Forums:
Another (possible) explanation from Hacking With Swift Forums:
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