ios - 不打印 indexPath.row 处的所有索引

Question

我遇到的问题是 eventsList 在索引上有一个数字，我们将使用 27 作为示例，当我运行以下代码时， print (eventLatitudeString) 和 print (eventLongitudeString) 行仅打印一小部分他们，两次。我是新手，请原谅我的困惑。

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return eventsList.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    if let path = Bundle.main.path(forResource: "Agencies", ofType: "plist"),
        let agencyNameDict = NSDictionary(contentsOfFile: path) as? [String: String] {
        translatedAgencyName = agencyNameDict[eventsList[indexPath.row].agencyId!]
        }



    let cell = myTableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! ViewControllerTableViewCell

        // create dateFormatter with UTC time format
        utcDate = eventsList[indexPath.row].dateTime
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'"
        dateFormatter.timeZone = NSTimeZone(name: "UTC")! as TimeZone
        let date = dateFormatter.date(from: utcDate!)

        // change to a readable time format and change to local time zone
        dateFormatter.dateFormat = "MM-dd-yy HH:mm"
        dateFormatter.timeZone = NSTimeZone(name: "EST")! as TimeZone
        timeStamp = dateFormatter.string(from: date!)

    cell.locationLabel.text = eventsList[indexPath.row].location
    cell.eventTimeLabel.text = timeStamp
    cell.eventTypeLabel.text = eventsList[indexPath.row].agencyEventTypeCode
    cell.agencyIdLabel.text = translatedAgencyName
    cell.eventTypeDescLabel.text = eventsList[indexPath.row].agencyEventTypeCodeDesc

    let numOfEvents = eventsList.count
    let stringNumOfEvents = "\(numOfEvents)"
    numberOfEvents.text = stringNumOfEvents

    eventLatitudeString = eventsList[indexPath.row].latitude!
    eventLongitudeString = eventsList[indexPath.row].longitude!

    print (eventLatitudeString)
    print (eventLongitudeString)

如果有必要，这里就是将项目附加到 eventsList 的地方...

func fetchData(){

    print ("entered fetch")

    ref?.child("caddata").observe(.childAdded, with: { (snapshot) -> Void in

        if let dictionary = snapshot.value as? [String: Any] {
            let event =  Events()
            event.setValuesForKeys(dictionary)

            if event.originatingAction == "CadEventNew" {
                self.eventsList.insert(event, at: 0)

            } else if event.originatingAction == "CadFieldEvent" {
                self.eventsList.insert(event, at: 0)

            } else if event.originatingAction == "CadEmergencyEvent" {
                self.eventsList.insert(event, at: 0)

            } else if event.originatingAction == "CadCloseEvent" {
                self.cadPacketType = event.originatingAction
                self.cadEventNumber = event.agencyEventId
                self.queryCloseUIDFromDB()

            } else {
              //  print ("The End")
            }
            DispatchQueue.main.async {
                self.myTableView.reloadData()
            }

        }
})

}    

Answer 1

请确保

func numberOfSections(in tableView: UITableView) -> Int {
    print("number of sections numberOfSections : \(tableView)")
    return 1
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    print("numberOfRowsInSections tableView : \(tableView)")
    return eventsList.count
}

另外请检查所有被调用的索引路径，只需打印indexPath，记住一件事。 cellForRowAt indexPath 仅在单元格显示时调用。如果单元格位于 tableview 滚动的可见内容之外，则不会调用此方法。

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

   print("IndexPath - Section:\(indexPath.section) row:\(indexPath.row)")

    if let path = Bundle.main.path(forResource: "Agencies", ofType: "plist"),
      let agencyNameDict = NSDictionary(contentsOfFile: path) as? [String: String] {

     .........................