SwiftUI - ForEach - 类型“_”没有成员“名称”

Question

我正在尝试 ForEach 在类内部的字符串数组上并收到错误： Type '_' has no member 'name'

我正在尝试模拟我在本教程中阅读的内容，但不明白为什么我的编译失败。 https://www.hackingwithswift.com/books/ios-swiftui/working-with-identifiable-items-in-swiftui

struct StatisticItem: Codable {
    let name: String
    let startValue: Int
    let modifier: Int
}

class Statistics: ObservableObject {
    let statisticsNames = ["One", "Two"]
    @Published var statList: [StatisticItem]

    init() {
        self.statList = [];
        for statisticsName in statisticsNames {
            self.statList.append(StatisticItem(name: statisticsName, startValue:  Int.random(in: 20 ... 100), modifier: 0))
        }
    }
}

struct ContentView: View {
    @ObservedObject var statistics = Statistics()

    var body: some View {
        Form {
            List {
                // Error shows up on this line: Type '_' has no member 'name'
                ForEach(statistics.statList, id:\.name) { stat in
                    TextField(stat.name)
                }
            }
        }
    }
}

Answer 1

首先你的模型需要是可修改的（所以使用var而不是let）

struct StatisticItem: Codable {
    var name: String
    var startValue: Int
    var modifier: Int
}

第二，TextField 需要Binding，所以应该如下所示

ForEach(Array(statistics.statList.enumerated()), id:\.1.name) { (i, stat) in
    TextField("", text: self.$statistics.statList[i].name)
}