问当每个节中的行数不同时，如何获得numberOfRows的计数？

EN

struct Holiday {
    var title: String = ""
    var description: String = ""
}

//You should better avoid plural form for something which represents a single object
struct CalendarEvent {
    var month: String = ""
    var eventdate: String = ""
    var eventdatenumber: String = ""
    //Better use plural form for the name representing multiple objects
    var holidays: [Holiday] = []
}

class CalendarViewController: UIViewController {
    //`myCalendarEventsFromStrut` is too long and `FromStrut` does not make sense
    var myCalendarEvents: [CalendarEvent] = []

    //Properties needed for parsing your XML
    var textCurrentlyParsed: String? = nil
    var monthFromXML: String = ""
    var dateeventFromXML: String = ""
    var datenumberFromXML: String = ""
    var holidaysFromXML: [Holiday] = []

    //Your table view shows some selected evnets in `myCalendarEvents`,
    //To improve response, you should beter keep the filtered result, when `selectedDate` is updated.
    var selectedDate: Date? {
        didSet {
            if let date = selectedDate {
                let currentMonthShown = monthFormatter.string(from: date)
                allEventsInVisibleMonth = myCalendarEvents.filter({ $0.month == currentMonthShown })
            } else {
                allEventsInVisibleMonth = [] //Or you prefer `allEventsInVisibleMonth = myCalendarEvents`?
            }
        }
    }
    var allEventsInVisibleMonth: [CalendarEvent] = []

    //You may have this sort of constants somewhere, this is just an example
    let TheCellID = "cell" //Change this according to your actual setups

    //
    // Date formatters.
    //  Better keep distinct DateFormaters accoding to the format to avoid simple mistakes
    //

    let monthFormatter: DateFormatter = {
       let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.dateFormat = "MMMM"
        return formatter
    }()

    let dateeventFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.dateFormat = "yyyy MM dd"
        return formatter
    }()

    let sectionHeaderFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.dateFormat = "yyyy-MM-dd"
        return formatter
    }()

    //...
}

extension CalendarViewController: XMLParserDelegate {
    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
        switch elementName {
        case "month", "dateevent", "datenumber", "holiday", "description":
            //Reset the text content for the element
            textCurrentlyParsed = ""
        case "calendarevent":
            //Reset all variables which may contain the result of previous element
            monthFromXML = ""
            dateeventFromXML = ""
            datenumberFromXML = ""
            holidaysFromXML = []
        case "calendar":
            //Can be ignored
            break
        default:
            print("Unexpected start tag:", elementName)
            break
        }
    }

    func parser(_ parser: XMLParser, foundCharacters string: String) {
        //`parser(_:foundCharacters:)` may be called several times for a seemingly single text content,
        //So you need to add the `string` to the currently parsed text
        textCurrentlyParsed? += string
    }

    func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        switch elementName {
        case "calendarevent":
            var calendarEvent = CalendarEvent()
            calendarEvent.month = monthFromXML
            calendarEvent.eventdate = dateeventFromXML
            calendarEvent.eventdatenumber = datenumberFromXML
            calendarEvent.holidays = holidaysFromXML
            myCalendarEvents.append(calendarEvent)
        case "month":
            if let parsedText = textCurrentlyParsed?.trimmingCharacters(in: .whitespacesAndNewlines) {
                monthFromXML = parsedText
            }
        case "dateevent":
            if let parsedText = textCurrentlyParsed?.trimmingCharacters(in: .whitespacesAndNewlines) {
                dateeventFromXML = parsedText
            }
        case "datenumber":
            if let parsedText = textCurrentlyParsed?.trimmingCharacters(in: .whitespacesAndNewlines) {
                datenumberFromXML = parsedText
            }
        case "holiday":
            if let parsedText = textCurrentlyParsed?.trimmingCharacters(in: .whitespacesAndNewlines) {
                var holiday = Holiday()
                holiday.title = parsedText
                holidaysFromXML.append(holiday)
            }
            break
        case "description":
            if
                let parsedText = textCurrentlyParsed?.trimmingCharacters(in: .whitespacesAndNewlines),
                case let lastIndexOfHoliday = holidaysFromXML.count - 1, lastIndexOfHoliday >= 0
            {
                //You need to modify the last entry in `holidaysFromXML`
                holidaysFromXML[lastIndexOfHoliday].description = parsedText
            }
        default:
            print("Unexpected end tag:", elementName)
            break
        }
    }
}

extension CalendarViewController: UITableViewDelegate, UITableViewDataSource {
    func numberOfSections(in tableView: UITableView) -> Int {
        return allEventsInVisibleMonth.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return allEventsInVisibleMonth[section].holidays.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let eventForTheSection = allEventsInVisibleMonth[indexPath.section]
        let holidayForTheRow = eventForTheSection.holidays[indexPath.row]
        let cell = tableView.dequeueReusableCell(withIdentifier: TheCellID, for: indexPath)
        //... setup the cell using `eventForTheSection` and `holidayForTheRow`
        return cell
    }

    // Prints <dateevent> reformatted as section header
    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        let eventForTheSection = allEventsInVisibleMonth[section]
        if let eventdateAsDate = dateeventFormatter.date(from: eventForTheSection.eventdate) {
            return sectionHeaderFormatter.string(from: eventdateAsDate)
        } else {
            return "Broken eventdate: \(eventForTheSection.eventdate)"
        }
    }

}