将新元素追加到数组 Swift

Question

我正在尝试根据日期过滤通知。所以我将在 tableview 的每个单独部分中显示它们。

到目前为止，我能够获取日期并将日期与今天、上个月和更早的日期进行比较，如下所示。

var todaySectionNotificationsArray = [NewNotificationModel]()
var lastMonthSectionNotificationsArray = [NewNotificationModel]()
var oldSectionNotificationsArray = [NewNotificationModel]()
let now = Date()
let today = Calendar.current.date(byAdding: .day, value: -1, to: Date())!
let lastMonth = Calendar.current.date(byAdding: .month, value: -1, to: Date())!
var old = Calendar.current.date(byAdding: .month, value: -2, to: Date())!

我为他们创建了 3 个空数组，如果他们的日期是我要查找的日期，我会尝试附加元素。

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    switch cellTypes[indexPath.row] {
    case .notification:
        if (notificationsViewModel[indexPath.row].toDate()! < today) {
            todaySectionNotificationsArray.append(notificationsViewModel[indexPath.row])
        } else if (notificationsViewModel[indexPath.row].toDate()! < lastMonth) {
            lastMonthSectionNotificationsArray.append(contentsOf:notificationsViewModel[indexPath.row])
        } else if (notificationsViewModel[indexPath.row].toDate()! > lastMonth) {
            oldSectionNotificationsArray += notificationsViewModel[indexPath.row])
        }
        return configureNotificationCell(indexPath: indexPath)
    case .dummy: return configureDummyCell(indexPath: indexPath)
    case .empty: return configureEmptyCell(indexPath: indexPath)
    case .error: return configureErrorCell(indexPath: indexPath)
    }
}

但是那些 .append 给我错误 “在调用实例方法时没有完全匹配 'append'” 和 += 运算符给出错误 ”运算符函数 '+=' 要求 'NewNotificationViewModel' 符合 'Sequence'"

这是我的 NewNotificationViewModel

final class NewNotificationViewModel {

// MARK: Properties
var notificationModel: NewNotificationModel!

private(set) var id: String?
private(set) var fullName: String!
private(set) var firstLetterName: String!
private(set) var profileImageString: String?
private(set) var profileImageURL: URL?
private(set) var date: String?
private(set) var isRead: Bool!
private(set) var isActionButtonActive: Bool?
private(set) var groupName: String?
private(set) var type: Int?
private(set) var itemDescription: String?
private(set) var itemId: String?
private(set) var mail: String?
private(set) var userId: String!
private(set) var dateTimeStamp: Double!
private(set) var interactionCount: String?

// MARK: Initialization
init(notificationModel: NewNotificationModel) {
    self.notificationModel = notificationModel
    self.id = notificationModel.id
    self.fullName = getFullName()
    self.firstLetterName = getFirstLetters()
    self.profileImageURL = getProfileImageURL()
    self.date = getDate()
    self.isRead = notificationModel.isRead
    self.isActionButtonActive = notificationModel.isActionButtonActive
    self.groupName = notificationModel.groupName
    self.type = notificationModel.type
    self.itemDescription = notificationModel.item?.description
    self.itemId = notificationModel.item?.itemId
    self.mail = getMail()
    self.userId = getUserId()
    self.dateTimeStamp = getTimeStamp()
    self.interactionCount = notificationModel.interactionCount
    }
  }
extension NewNotificationViewModel {
    
    func toDate() -> Date? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
        dateFormatter.timeZone = TimeZone.current
        return dateFormatter.date(from: self)
    }

这是 NewNotificationModel

  class NewNotificationModel: Serializable {
    var id: String?
    var fromUser: NewNotificationFromUserModel!
    var type: Int?
    var item: NewNotificationItemModel?
    var isRead: Bool?
    var creationTime: String?
    var isActionButtonActive: Bool?
    var groupName: String?
    var interactionCount: String?
    }

所以现在我不知道该怎么办。即使想出这个解决方案也花了我 3-4 个小时。

Answer 1

看起来你在 NewNotificationViewModel toDate() 函数

上不小心传入了 self 而不是 date 属性

func toDate() -> Date? {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
    dateFormatter.timeZone = TimeZone.current
    return dateFormatter.date(from: self)
}

这一行：return dateFormatter.date(from: self) 应该是 return dateFormatter.date(from: date ?? "")

Answer 2

根据您的模型和 viewModel，我认为您可以将 viewModel 的属性(notificationModel) 附加到数组，如下所示

todaySectionNotificationsArray.append(notificationsViewModel[indexPath.row].notificationModel)

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