iOS 开发并发问题？

在编写用户列表模块中，后端需要并发的访问 users ，因此学了一段时间的并发，遇到了很多问题，解决了大部分，但仍然感觉代码似乎有不少问题，但由于水平不够，希望大家帮忙看看，感谢

actor UsersModel { private(set) var users: [User] private(set) var userIDs: Set<User.UserIDType> init() async { // users = Bundle.main.decode(file: "allUsers.json") userIDs = Set(["little-boy52", "0x3f", "mindexercise", "smilyt_", "zhui-ming-zhen-bai-1", "333"]) // 升序排列 users = (await loadAllUsers(userIDs: userIDs)).sorted { $0.contestResults?.rating ?? 0.0 > $1.contestResults?.rating ?? 0.0 } } func addUser(user: User) { } func addUserByID(id: User.UserIDType) async -> Bool { if let user = await loadUser(userid: id) { users.append(user) userIDs.insert(id) return true } return false } func deleteUser(user: User) { userIDs.remove(user.id) users.removeAll { return $0.id == user.id } } func contains(id: String) -> Bool { userIDs.contains(id) } } @MainActor class UsersViewModel: ObservableObject { @Published var model: UsersModel? = nil func loadModel() async { let model = await UsersModel() DispatchQueue.main.async { // Update the UI on the main thread self.model = model } } var users: [User] { get async { if let model = model { return await model.users } else { return [] } } } func addUser(user: User) async { await model?.addUser(user: user) } func addUserByID(id: User.UserIDType) async -> Bool { if model == nil { return false } return await model!.addUserByID(id: id) } func deleteUser(user: User) async { await model?.deleteUser(user: user) } func contains(id: String) async -> Bool { if model == nil { return false } return await model!.contains(id: id) } } 

最后调用 loadModel

// UsersView.swift VStack {...} .task { await usersVM.loadModel() } 

我在 UsersViewModel 中定义了计算字段 users，在 SwiftUI 中调用的话需要使用 ForEach(Task {await usersVM.users}.value) { user in ... }，但这样的话又会报错'async' property access in a function that does not support concurrency，如何解决？