如何在SwiftUI的List中更新TextField的默认值

开发SwiftUI视图时，需要实现点击切换按钮为List中的TextField设置对应默认值。使用Text组件时逻辑正常，但替换为TextField后无法运行。直接给单个@State变量赋值会触发编译错误：No exact matches in reference to static method 'buildExpression'，最终通过数组存储多个状态值并绑定到对应TextField的方式解决问题。

初始可运行的Text版本代码 #

struct ContentView: View {
    
    @State var isEnableBatch: Bool = false

    var body: some View {
        VStack {
            Button {
                isEnableBatch.toggle()
            } label: {
                Image(isEnableBatch == true ? "EAIcon-Check_rectangle" : "EAIcon-Check_Box")
            }
            
            List {
                ForEach(0 ..< 10, id: \.self) { index in
                    let value = isEnableBatch ? "批量启用" : "\(index)"
                    Text(value) // <-- 换成TextField后不知道怎么实现
                }
            }
            .listStyle(.plain)

        }
        .padding()
    }
}

替换为TextField后的错误代码 #

struct ContentView: View {
    
    @State var isEnableBatch: Bool = false
    @State var attValue: String = ""

    var body: some View {
        VStack {
            Button {
                isEnableBatch.toggle()
            } label: {
                Image(isEnableBatch == true ? "EAIcon-Check_rectangle" : "EAIcon-Check_Box")
            }
            
            List {
                ForEach(0 ..< 10, id: \.self) { index in
                    attValue = isEnableBatch ? "批量启用" : "\(index)" <-- 怎么更新TextField的默认值？
                    TextField("", text: $attValue)
                }
            }
            .listStyle(.plain)

        }
        .padding()
    }
}

最终解决方案代码 #

struct ContentView: View {
    
    @State var isEnableBatch: Bool = false
    @State var attValues: [String] = ["", "" , ""] // <- 用数组存储每个TextField的状态值
    
    var body: some View {
        VStack {
            Button {
                isEnableBatch.toggle()
                // 切换按钮时批量更新状态值
                if isEnableBatch {
                    for index in 0 ..< 3 {
                        attValues[index] = "批量启用"
                    }
                } else {
                    for index in 0 ..< 3 {
                        attValues[index] = ""
                    }
                }

            } label: {
                Image(isEnableBatch == true ? "EAIcon-Check_rectangle" : "EAIcon-Check_Box")
            }
            
            List {
                ForEach(0 ..< 3, id: \.self) { index in
                    TextField("", text: $attValues[index]) // <-- 绑定对应下标的状态值
                }
            }
            .listStyle(.plain)

        }
        .padding()
    }
}

效果演示 #

内容的提问来源于stack exchange，提问作者Alex Cheng