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

【问题标题】：Instance method 'appendInterpolation(_:formatter:)' requires that 'Any' inherit from 'NSObject'实例方法 'appendInterpolation(_:formatter:)' 要求 'Any' 继承自 'NSObject'
【发布时间】：2020-12-04 13:16:06
【问题描述】：

我有一个字典数组。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“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]
]

这是打印出数组的代码

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()
    }
}

【问题讨论】：

标签： ios arrays swift dictionary swiftui

【解决方案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)")
        }
    }
}

如果要显示完整排名，还可以使ClubRanking符合CustomStringConvertible，并在ForEach中显示rankings的每个元素的description属性。

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)
            }
        }
    }
}

【讨论】：