ios - 实例方法 'appendInterpolation(_:formatter:)'要求 'Any'继承自 'NSObject'

Question

我有一系列字典。但是我想将字典中的特定键显示为文本。但我不断收到错误消息“实例方法‘appendInterpolation(_:formatter:)’要求‘Any’继承自‘NSObject’”

这是我的字典

[
["nickname":"Spurs","Pts":21],
["nickname":"Liverpool","Pts":20]
]

下面是打印数组的代码

struct TeamList: View {
    var clubRanking: [[String:Any]] = [["nickname":"Spurs","Pts":21],["nickname":"Liverpool","Pts":20]]
    var body: some View {
        VStack(alignment: .leading) {
            Text("\(clubRanking[0]["nickname"])")      //The error happens here
        }
    }
}

struct TeamList_Previews: PreviewProvider {
    static var previews: some View {
        TeamList()
    }
}

Answer 1

不要使用[String:Any] 来存储您的数据模型。创建适当的模型类型并存储该类型的 Array。

struct ClubRanking {
    let nickName: String
    let points: Int
}

struct TeamList: View {
    let rankings = [ClubRanking(nickName: "Spurs", points: 21), ClubRanking(nickName: "Liverpool", points: 20)]
    var body: some View {
        VStack(alignment: .leading) {
            Text("\(rankings[0].nickName)")
        }
    }
}

如果想显示完整的排名，也可以让ClubRanking符合CustomStringConvertible，显示每个元素的description属性在 ForEach 中的 rankings。

extension ClubRanking: CustomStringConvertible {
    var description: String {
        "Team: \(nickName), points: \(points)"
    }
}

struct TeamList: View {
    let rankings = [ClubRanking(nickName: "Spurs", points: 21), ClubRanking(nickName: "Liverpool", points: 20)]
    var body: some View {
        VStack(alignment: .leading) {
            ForEach(rankings, id: \.nickName) { ranking in
                Text(ranking.description)
            }
        }
    }
}