在后台应用程序时从默认通知中心接收通知

是的，您可以创建LocalNotificaion，并在应用程序进入后台并返回前台时触发它。

func scheduleNotification(timeInter : TimeInterval) {
        let content = UNMutableNotificationContent()
        let userActions = "User Actions"
        content.title = "Title "
        content.body = "Body"
        content.sound = UNNotificationSound.init(named: 
        content.categoryIdentifier = userActions
        content.userInfo = ["MID" : RANDOM_ID, "timeInterval" : String(timeInter)]
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInter, repeats: false)
        let identifier = String(timeInter)


        let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
        print(request.identifier)
        notificationCenter.add(request) { (error) in
            if let error = error {

            }
        }
        //  let snoozeAction = UNNotificationAction(identifier: "Snooze", title: "Snooze", options: [])
        let deleteAction = UNNotificationAction(identifier: "Delete", title: "Delete", options: [.destructive])
        let category = UNNotificationCategory(identifier: userActions, actions: [deleteAction], intentIdentifiers: [], options: [])
        notificationCenter.setNotificationCategories([category])
    }