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如何在 SwiftUI 中使 Picker 与 ObservedObject 一起工作？

但我在结构 GameListPicker 中收到消息“通用结构‘Picker’要求‘String’符合‘View’”

import SwiftUI

struct GameListPicker: View {
    
    @ObservedObject var gameListViewModel = GameListViewModel()
    @State private var selectedGameList = ""
    
    var body: some View {
     Picker(selection: $selectedGameList, label: ""){
            ForEach(gameListViewModel.gameList) { gameList in
                Text(gameList.gameName)
            }
        }
     .onAppear() {
            self.gameListViewModel.fetchData()
            }
    }
}

游戏列表视图模型

import Foundation
import Firebase

class GameListViewModel: ObservableObject{
    
    @Published var gameList = [GameListModel]()
    let db = Firestore.firestore()
    
    func fetchData() {

        db.collection("GameData").addSnapshotListener {(querySnapshot, error) in
        guard let documents = querySnapshot?.documents else …