多种枚举类型列出所有情况 [英] Multiple enum types list all cases

问题描述

我无法解决这个问题，也找不到任何答案，希望有人能指出我正确的方向.我有多个枚举.一些例子(我有很多，也有更复杂的枚举):

can't wrap my head around this and can't find any answers, hope someone could point me in the right direction. I have multiple enums. Some examples(i have a lot more and also more complex enums):

enum Fish: String, CaseIterable, Displayable {
    case goldfish
    case blueTang = "blue_tang"
    case shark
}

enum Tree: String, CaseIterable, Displayable {
    case coconut
    case pine
    case englishOak = "english_oak"
}

我想将这些显示在带有部分的列表中.我正在使用swiftUI，但这可能无关紧要.我想实现一个功能，仅通过提供Enum类型就可以为我提供视图.

I want to display those in a list with sections. I'm using swiftUI but that probably doesn't matter. I want to achieve a function that could provide me with a view just from giving an Enum type.

例如:

view(forType: Fish)

它看起来应该像这样:

func view(forType: Type) -> some View {
   VStack {
       Text(String(describing: Type.self))
       Type.allCases.forEach { case in
          ...
       }
    }
}

如果有人可以帮助我，如果有一种方法可以概括Enum类型，我将非常感谢！

If anyone could help me out on if there is a way how to generalize Enum types, I would be super thankful!

推荐答案

此处是可能解决方案的演示.使用Xcode 12.1/iOS 14.1编写

Here is a demo of possible solution. Prepared with Xcode 12.1 / iOS 14.1

enum Fish: String, CaseIterable {
    case goldfish
    case blueTang = "blue_tang"
    case shark
}

func view<T: CaseIterable & Hashable>(for type: T.Type) -> some View where T.AllCases: RandomAccessCollection {
    VStack(alignment: .leading) {
        Text(String(describing: type)).bold()
        ForEach(type.allCases, id: \.self) { item in
            Text(String(describing: item))
        }
    }
}

struct FishDemoView: View {
    var body: some View {
        view(for: Fish.self)
    }
}

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