ios - 如何在 SwiftUI 中迭代/foreach 数组

Question

我有这个字典数组。

let deckColors = [
    ["name": "blue", "desc": "desc1"],
    ["name": "yellow", "desc": "desc2"],
]

而我的观点:

struct ContentView: View {
    var body: some View {
        ForEach(0 ..< deckColors.count) {value in
            Text(deckColors[value]["name"])
        }
    }
}

我怎样才能让它工作？当前出现此错误:协议(protocol)类型 Any不符合 StringProtocol因为只有具体类型才能符合协议(protocol)

Answer 1

这似乎是实现结构的一种非常复杂的方式:

struct DeckColor {
    var name: String
    var desc: String
}

let deckColors = [
    DeckColor(name: "blue", desc: "desc1"),
    DeckColor(name: "yellow", desc: "desc2")
]

struct ContentView: View {
    var body: some View {
        ForEach(0 ..< deckColors.count) { value in
            Text(deckColors[value].name)
        }
    }
}

您实现它的方式需要处理字典不包含 "name" 的情况。值(value)。你可以这样做，但它更丑陋，更脆弱:

struct ContentView: View {
    var body: some View {
        ForEach(0 ..< deckColors.count) { value in
            Text(deckColors[value]["name"] ?? "default text if name isn't there.")
        }
    }
}