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ForEach で順番も取得したい

enumerated() を使う方法​

swift
ForEach(Array(names.enumerated()), id: \.element) { idx, name in
    Text("\(idx) : \(name)")
}

indices を使う方法​

swift
ForEach(names.indices, id: \.self) { idx in
    let name = names[idx]
    Text("\(idx) : \(name)")
}

List .. selection で使いたい場合​

どちらのパターンだとしても .tag(..) をつければ良い

swift
List(names, id: \.self, selection: $selectedName) { name in
    Text(name)
}

↓

swift
List(selection: $selectedName) {
    ForEach(Array(files.enumerated()), id: \.element) { idx, name in
        Text("\(idx) : \(name)")
            .tag(name)
    }
}