我正在开发一个药物提醒应用程序，用户可以在其中添加每日，每周或隔日的药物提醒，并选择提醒时间。这是一个简单的实现每天和每周，但我很难找到一个解决方案，为交替的日子，因为苹果不提供任何选项，通过频率值与日历通知触发。我在网上找遍了，但没有找到任何解决办法。到目前为止，我所做的是，如果用户选择隔天提醒，我在一个循环中创建多个通知。但只有我在循环中的第一个通知被解雇，如果更改系统日期和时间来检查下一个通知，它不起作用。我在这里添加我的代码，如果我做错了什么，请有人纠正我。

func scheduleNotification(_ notification: Notification) {
    let content = UNMutableNotificationContent()
    content.body = Constants.notificationDescription
    content.title = notification.title
    content.sound = .default
    content.userInfo = ["id":notification.id]
    content.categoryIdentifier = Constants.notificaitonCategoryIdentifier
    
    // Notification Actions
    let takenAction = UNNotificationAction(identifier: Constants.notiTakenActionIdentifier, title: Constants.notificationTakenText)
    let notTakenAction = UNNotificationAction(identifier: Constants.notiNotTakenActionIdentifier, title: Constants.notificationNotTakenText)
    let actionCategory = UNNotificationCategory(identifier: Constants.notificaitonCategoryIdentifier, actions: [takenAction, notTakenAction], intentIdentifiers: [])
    UNUserNotificationCenter.current().setNotificationCategories([actionCategory])
    var dateComponents = DateComponents()
    if notification.frequency == .daily {
      dateComponents.hour = notification.hour
      dateComponents.minute = notification.min
      let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
      let nextTriggerDate = trigger.nextTriggerDate()
      let request = UNNotificationRequest(
        identifier: notification.id,
        content: content,
        trigger: trigger)
      UNUserNotificationCenter.current().add(request)
    } else if notification.frequency == .weekly {
      dateComponents.hour = notification.hour
      dateComponents.minute = notification.min
      dateComponents.weekday = notification.weekDay
      let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
      let nextTriggerDate = trigger.nextTriggerDate()
      let request = UNNotificationRequest(
        identifier: notification.id,
        content: content,
        trigger: trigger)
      UNUserNotificationCenter.current().add(request)
    } else if notification.frequency == .alternateDay {
      let firstDate = notification.date
      for i in stride(from: 0, to: 30, by: 2) {
        guard let date = Calendar.current.date(byAdding: .day, value: i, to: firstDate) else {return}
        let dateComponents = date.getDateComponents()
        print(date)
        let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)
        /*let timeInterval = Double(120 + (i * 120))
        print(timeInterval)
        let timeTrigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInterval, repeats: false)
        print(timeTrigger.nextTriggerDate())*/
        let request = UNNotificationRequest(
          identifier: notification.id + String(i),
          content: content,
          trigger: trigger)
        UNUserNotificationCenter.current().add(request)
      }
      self.getPendingRequests()
    }
  }

在这里，我使用stride在每次迭代中添加2天，当我使用print语句检查日期时，所有日期都被打印出来并且是正确的，但是除了第一个通知之外，没有出现通知。先谢了。

编辑：

extension Date {
    public func getDateComponents() -> DateComponents {
        let dateComponents = Calendar.current.dateComponents([.hour, .minute, .second, .day], from: self)
        
        return dateComponents
    }
}