Swift

Question

我想让我的代码更具可读性，所以我决定制作一些重复的字典键，软编码...所以我创建了一个新的 .swift 文件，里面有 2 个结构：

struct DatabaseTableNames {
    let Photo = PhotoTable()
}

private struct PhotoTable {
    let lowQuality = "lowQuality"
    let highQuality = "highQuality"
    let numberOfLikes = "numberOfLikes"
}

所以我有我要使用的初始结构和第二个结构，我不希望它在文件范围之外可见...问题是，它说 Photo 属性的 DatabaseTableNames 结构，需要声明为 fileprivate 因为 PhotoTable 是 private...

我做错了什么？

Answer 1

关键是嵌套 PhotoTable 并使其属性静态化。

struct DatabaseTableNames {
    struct PhotoTable {
        static let lowQuality = "lowQuality"
        static let highQuality = "highQuality"
        static let numberOfLikes = "numberOfLikes"
    }
}

使用示例：

let test = DatabaseTableNames.PhotoTable.lowQuality
print(test)

Answer 2

交换您的 private 设置 - 并确保它与您要使用的 UIViewController 在同一文件中定义

private struct DatabaseTableNames {
    let Photo = PhotoTable()
}

struct PhotoTable {
    let lowQuality = "lowQuality"
    let highQuality = "highQuality"
    let numberOfLikes = "numberOfLikes"
}

然后，访问结构

private var photo : DatabaseTableNames?

Swift - 如何声明私有嵌套结构？

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struct

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