Swift 如何写一个；风格；视图修饰符，它会影响特定类型的所有嵌套视图

我基本上是在try 创建一些类似于内置buttonStyle、labelStyle等修饰符的东西.它们会影响所有嵌套的按钮/标签，无论它们嵌套得有多深.例如:

VStack {
    VStack {
        VStack {
            Button("OK") {}
            ...
        }
        ...
    }
    ...
}
.buttonStyle(.bordered) // this changes the style of the button, even if it is deeply nested

我的目标是对我的自定义视图执行相同的操作.让我们称其为TwinTextsView:

VStack {
    VStack {
        VStack {
            TwinTexts(text1: "Foo", text2: "Bar")
            ...
        }
        ...
    }
    ...
}
.twinTextsStyle(CustomStyle()) // this changes the style of TwinTexts, even if it is deeply nested

其中CustomStyle可以像ButtonStyle一样实现，makeBody方法接受具有两个视图的配置，表示文本

struct TwinTextsStyleConfiguration {
    // not sure what types these should be. AnyView?
    let text1: Text1
    let text2: Text2
}

protocol TwinTextsStyle {
    associatedtype Body: View
    
    @ViewBuilder
    func makeBody(configuration: TwinTextsStyleConfiguration) -> Body
}

struct CustomStyle: TwinTextsStyle {
    func makeBody(configuration: TwinTextsStyleConfiguration) -> some View {
        // let's suppose I want to put one text on top of the other.
        VStack {
            configuration.text1
            configuration.text2
        }
    }
}

然后，TwinTexts人将使用此样式，如下所示:

struct TwinTexts: View {
    let text1: String
    let text2: String
    
    var body: some View {
        // note that these are not of type "Text". I don't know what type they are as I will be adding view modifiers to them
        // here I am using lineLimit as an example 
        let text1 = Text(text1).lineLimit(1)
        let text2 = Text(text2).lineLimit(1)
        // not sure how I would get the "style" here
        style.makeBody(.init(text1: text1, text2: text2))
    }
}

我想到的一个 idea 是使用定制的Environment，因为.environment适用于所有嵌套的视图.有两个问题:

• style.makeBody将返回any View，它不能在body中使用

struct TwinTextsStyleKey: EnvironmentKey {
    static let defaultValue: any TwinTextsStyle = DefaultStyle()
}

extension EnvironmentValues {
    var twinTextsStyle: any TwinTextsStyle {
        get { self[TwinTextsStyleKey.self] }
        set { self[TwinTextsStyleKey.self] = newValue }
    }
}

extension View {
    func twinTextsStyle(_ style: some TwinTextsStyle) -> some View {
        self.environment(\.twinTextsStyle, style)
    }
}

struct TwinTexts: View {
    let text1: String
    let text2: String
    @Environment(\.twinTextsStyle) var style
    var body: some View {
        let text1 = Text(text1).lineLimit(1)
        let text2 = Text(text2).lineLimit(1)
        style.makeBody(.init(text1: text1, text2: text2)) // this returns "any View"
    }
}

• 我不知道我应该为TwinTextsStyleConfiguration中的视图使用什么类型.

  我看了看ButtonStyleConfiguration.Label，根据文件，这是一个"类型擦除"的视图.这是AnyView的实际用例吗？