ForEach 循环遍历视图模型数组导致 Xcode 编译错误的问题 - SwiftUI

Question

当我尝试使用主视图模型的子视图模型添加 ForEach 循环时出现未知编译错误：

我以前在类似情况下看到过这个错误，我想知道 ForEach 循环中的 ViewModels 是否存在任何可能导致此错误的常见错误？

这是我的带有 ForEach 循环的 SwiftUI 视图：

struct GroupHubView: View {
    @ObservedObject var groupHubVM: GroupHubViewModel
    
    var body: some View {
        NavigationView {
            ScrollView {
                VStack {
                    ForEach(groupHubVM.activeGroupViewModels) { groupCellVM in
                        GroupCellView(groupCellVM: groupCellVM)
                    }
                }
            }
        }

这是 ViewModel，在我调用 loadActiveGroups():

之前，它有一个组合填充的子视图模型列表，开始时是一个空数组

class GroupHubViewModel: ObservableObject {
    
    @Published var groupRepository: GroupStoreType
    @Published var currentUser: CurrentUserType
    
    @Published var activeGroupViewModels: [GroupCellViewModel] = [GroupCellViewModel]()
    @Published var pendingInviteViewModels: [GroupCellViewModel] = [GroupCellViewModel]()
    
    private var cancellables = Set<AnyCancellable>()
    
    
    init(groupRepository: GroupStoreType, currentUser: CurrentUserType = CurrentUserProfile.shared) {
        self.groupRepository = groupRepository
        self.currentUser = currentUser
        
        self.loadActiveGroups()
        self.loadPendingGroups()
    }
    
    func loadActiveGroups() {
        self.groupRepository.accountabilityGroupsPublisher.map { groups in
            groups.filter { group in
                if group.members?.contains(where: { [=12=].userId == self.currentUser.currentUser!.id && [=12=].membershipStatus == .active }) == true {
                    return true
                } else {
                    return false
                }
            }
            .map { group in
                GroupCellViewModel(groupRepository: self.groupRepository, accountabilityGroup: group)
            }
        }
        .assign(to: \.activeGroupViewModels, on: self)
        .store(in: &cancellables)
    }

错误：只要我添加这个： ForEach(groupHubVM.activeGroupViewModels) { groupCellVM in 我在视图中收到了完整的未知编译错误。

如果我只是添加 ForEach，如下所示：ForEach(groupHubVM.activeGroupViewModels)，我会收到此错误消息，指出“无法推断出“通用参数“Content””：

已编辑：此时我的 GroupCellViewModel 非常简单 - 它只包含 GroupRepository 和此时的特定组：

class GroupCellViewModel: ObservableObject {
    
    @Published var groupRepository: GroupStoreType
    
    @Published var group: AccountabilityGroup
    
    private var cancellables = Set<AnyCancellable>()
    
    init(groupRepository: GroupStoreType, currentUser: CurrentUserType = CurrentUserProfile.shared, accountabilityGroup: AccountabilityGroup) {
        self.groupRepository = groupRepository
        self.group = accountabilityGroup
    }
    
}

Answer 1

根据 loreipsum 和 George 的上述评论，我的问题是 GroupCellViewModel 不符合 Identifiable。我解决了这个问题并解决了这个问题：

class GroupCellViewModel: ObservableObject, Identifiable {
    
    @Published var groupRepository: GroupStoreType
    
    @Published var group: AccountabilityGroup
    
    private var cancellables = Set<AnyCancellable>()
    
    init(groupRepository: GroupStoreType, currentUser: CurrentUserType = CurrentUserProfile.shared, accountabilityGroup: AccountabilityGroup) {
        self.groupRepository = groupRepository
        self.group = accountabilityGroup
    }
    
}

ForEach 循环遍历视图模型数组导致 Xcode 编译错误的问题 - SwiftUI

Issues with ForEach Loop over view model array causing Xcode compile error - SwiftUI

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