Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
476 views
in Technique[技术] by (71.8m points)

combine - SwiftUI dynamic List with @Binding controls

How do I build a dynamic list with @Binding-driven controls without having to reference the array manually? It seems obvious but using List or ForEach to iterate through the array give all sorts of strange errors.

struct OrderItem : Identifiable {
    let id = UUID()
    var label : String
    var value : Bool = false
}

struct ContentView: View {
    @State var items = [OrderItem(label: "Shirts"),
                        OrderItem(label: "Pants"),
                        OrderItem(label: "Socks")]
    var body: some View {
        NavigationView {
            Form {
                Section {
                    List {
                        Toggle(items[0].label, isOn: $items[0].value)
                        Toggle(items[1].label, isOn: $items[1].value)
                        Toggle(items[2].label, isOn: $items[2].value)
                    }
                }
            }.navigationBarTitle("Clothing")
        }
    }
}

This doesn't work:

            ...
                Section {
                    List($items, id: .id) { item in
                        Toggle(item.label, isOn: item.value)
                    }
                }
            ...

Type '_' has no member 'id'

Nor does:

            ...
                Section {
                    List($items) { item in
                        Toggle(item.label, isOn: item.value)
                    }
                }
            ...

Generic parameter 'SelectionValue' could not be inferred

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Try something like

...
   Section {
       List(items.indices) { index in
           Toggle(self.items[index].label, isOn: self.$items[index].value)
       }
   }
...

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...