ForEach is used ambiguous

Question

I have the following code:

import SwiftUI
func TableColumnView<T>(title: String? = nil, k : KeyPath<T, Int>) -> some TableColumnContent<T, KeyPathComparator<T>> where T:Identifiable{
    TableColumn(title ?? String(describing: k).components(separatedBy: ".").last!, value: k){ model in
                Text("\(model[keyPath: k])").padding(0)
    }.width(64)
}

struct Animal : Identifiable {
    var id : Int
    var a : Int
    var b : Int
    var c : Int
}

let animals : [Animal]=[Animal(id: 1, a:1,b:2,c:3),Animal(id: 2, a:4,b:5,c:6),Animal(id: 3, a:7,b:8,c:9)]
let keyPaths : [KeyPath<Animal, Int>] = [\Animal.a,\Animal.b,\Animal.c]

struct ContentView: View {
    @State var sortOrder: [KeyPathComparator<Animal>] = []

    var body: some View {
        VStack {
            Table(animals,sortOrder: $sortOrder){
                ForEach(keyPaths,id: \.self){ k in
                    TableColumnView(k: k)
                }
            }
        }
        .padding()
    }
}

#Preview {
    ContentView()
}

Now why do I get the error : Ambiguous use of 'init(_:id:content:)' on the ForEach? And how can I easily see the different possible uses? If I Command click on ForEach I only see one use. How can I see the others? And how do I solve it?

Sweeper · Accepted Answer · 2025-04-15 01:51:59Z

2

To have a dynamic number of table columns, you need to use TableColumnForEach, because TableColumnContent needs a bit more type information (namely RowValue and Sort) that a regular ForEach cannot provide.

Table(animals,sortOrder: $sortOrder){
    TableColumnForEach(keyPaths,id: \.self){ k in
        TableColumnView(k: k)
    }
}

answered Apr 15 at 1:51

Sweeper

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