Tableviewcontroller“cellForRowAtIndexPath” - 索引从4开始，而不是0

时间：2015-05-21 10:39:04

标签： ios swift

我在pageviewcontroller上放了三个表视图控制器。

pageviewcontroller加载中间vc。

当我转到左边的vc，然后拉表以便重新加载 - 我有问题，在函数cellForRowAtIndexPath上，indexPath.row从4开始，而不是0.

为什么indexPath.row从4开始而不是0？

我认为，这不是代码问题！我有错误：

  

无法索引空缓冲区

我发现了错误。我不知道为什么会发生这种情况，但是当我重新加载表（拉动它）时，由于某种原因，它需要最后一行（在我的情况下，我在屏幕上有4行从0开始计数）并在cellAtIndex数组中使用它。每次从互联网上提取数据之前，我都会删除数组中的所有元素。我更改了该代码，我在重新加载之前删除了所有元素并且没有出现错误。有趣的是我在其他vc上使用相同的功能，一切正常。

我要两个下载数据的请求：

class func JSONRequest2(urlInput: String, tableName: UITableView, action: (NSArray)->Void, refresh:UIRefreshControl, viewContr: UIViewController, hideLoadingViewAndStopAnimating: ()->Void) {



    let urlPath = urlInput

    let url = NSURL(string: urlPath)

    let session = NSURLSession.sharedSession()

    println("started first json request")

    let task = session.dataTaskWithURL(url!, completionHandler: {data, response, error -> Void in

        if error != nil {
            println(error)
            let stringError = error.localizedDescription
            CommonFunctions.showAlert("Ошибка", alertText: stringError, alertButtonText: "Закрыть", viewController: viewContr)
        }
        else{

            var err: NSError?
            if data != nil {

                if let jsonResult =  NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSArray {
                    println("the number of news in json :\(jsonResult.count)")

                    if (err == nil) {

                        dispatch_async(dispatch_get_main_queue(), {
                            action(jsonResult)
                    //tableName.reloadData()
                        })
                    }else{
                        let stringError = err?.localizedDescription
                        CommonFunctions.showAlert("Ошибка", alertText: stringError!, alertButtonText: "Закрыть", viewController: viewContr)
                    }
                }else {
                    hideLoadingViewAndStopAnimating()
                    println("json is not valid")
                    var dic = dictForErrors()
                    CommonFunctions.showAlert("Ошибка", alertText: dic.alertText, alertButtonText: "Закрыть", viewController: viewContr)
                }
            }else {

                CommonFunctions.showAlert("Ошибка", alertText: "data is nil",alertButtonText: "Закрыть", viewController: viewContr)
                println("json data is nil")
            }
        }
    })

    task.resume()
}

class func JSONRequest(urlInput: String, tableName: UITableView, action: (NSArray)->Void, refresh:UIRefreshControl, category: Int, viewContr: UIViewController, hideLoadingViewAndStopAnimating: ()->Void) {

    //refresh.beginRefreshing()

    let urlPath = urlInput

    let url = NSURL(string: urlPath)

    let session = NSURLSession.sharedSession()

    println("started second request")

    let task = session.dataTaskWithURL(url!, completionHandler: {data, response, error -> Void in

        if error != nil {
            println(error)
            let stringError = error.localizedDescription
            CommonFunctions.showAlert("Ошибка", alertText: stringError, alertButtonText: "Закрыть", viewController: viewContr)
        }
        else{

            var err: NSError?
            if data != nil{
                if let jsonResult =  NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSArray {
            println("the number of news in json :\(jsonResult.count)")

                    if (err == nil) {



                        dispatch_async(dispatch_get_main_queue(), {
                            action(jsonResult)
                            hideLoadingViewAndStopAnimating()
                            tableName.reloadData()
                            refresh.endRefreshing()
                        })

                    }else{
                        let stringError = err?.localizedDescription
                        hideLoadingViewAndStopAnimating()
                        CommonFunctions.showAlert("Ошибка", alertText: stringError!, alertButtonText: "Закрыть", viewController: viewContr)
                    }
                }else {
                    hideLoadingViewAndStopAnimating()
                    println("json is not valid")
                    var dic = dictForErrors()
                    CommonFunctions.showAlert("Ошибка", alertText: dic.alertText, alertButtonText: "Закрыть", viewController: viewContr)
                }
            }else{

                CommonFunctions.showAlert("Ошибка", alertText: "data is nil",alertButtonText: "Закрыть", viewController: viewContr)
                println("json data is nil")
            }
        }
    })

    task.resume()
}

这是我提出请求以下载两个请求的方式

self.refreshControl = self.refreshController
    self.refreshControl?.addTarget(self, action: "loadDataNewsLenta", forControlEvents: .ValueChanged)


    if arrayMainPage.count > 0 {
        activityView.alpha = 0.0
        arrayNewSLenta = arrayMainPage
        self.tableView.reloadData()
    }else{
        // loading first time news
        activityView.alpha = 0.5
        activityIndicator.startAnimating()
        isFirstReq = true
        arrayNewSLenta.removeAll(keepCapacity: false)
        CommonFunctions.JSONRequest2(urlString, tableName: tableView, action: desirializeJSONToArray, refresh: self.refreshController, viewContr: self, hidLoadingViewAndStopAnimating)
    }

我把上面的代码放在viewdidload上。这段代码是我重新加载的地方：

func hidLoadingViewAndStopAnimating() {
    activityView.alpha = 0
    activityIndicator.stopAnimating()
}

func configureTableView() {
    tableView.rowHeight = UITableViewAutomaticDimension
    tableView.estimatedRowHeight = 110.0
}

func loadDataNewsLenta() {
    arrayNewSLenta.removeAll(keepCapacity: false)
    isFirstReq = true
    refreshController.beginRefreshing()
    CommonFunctions.JSONRequest2(urlString, tableName: tableView, action: desirializeJSONToArray, refresh: self.refreshController, viewContr: self, hidLoadingViewAndStopAnimating)
}

这是关于tableview代码和json到数组的绝望化：

 // MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    println("it is news lenta count \(arrayNewSLenta.count)")
    return arrayNewSLenta.count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = self.tableView.dequeueReusableCellWithIdentifier("lentaCell", forIndexPath: indexPath) as LentaTableViewCell
    let inex = indexPath.row
    cell.labelDateOfPublication.text = arrayNewSLenta[indexPath.row].pubDate
    cell.labeltitle.text = arrayNewSLenta[indexPath.row].pageTitle

    return cell
}

func desirializeJSONToArray(jsonArray: NSArray){

    for singleJSON in jsonArray{
        var singleArticle = ArticleInfo()

        if let arrayText = singleJSON as? NSDictionary{

            if let articleID = arrayText["id"] as? NSString{
                singleArticle.articleID = articleID
            }

            if let pageTitle = arrayText["pagetitle"] as? NSString {
                singleArticle.pageTitle = pageTitle
            }

            if let longTitle = arrayText["longtitle"] as? String{
                singleArticle.longTitle = longTitle
            }
            if let introText = arrayText["introtext"] as? String{

                singleArticle.introText = introText
            }
            if let contentText = arrayText["content_text"] as? String{
                singleArticle.contentText = contentText

            }
            if let category = arrayText["category"] as? String{

                singleArticle.category = category
            }
            if let imageLink = arrayText["thumbnail"] as? String{
                singleArticle.linkToImage = imageLink

            }
            if let videoLink = arrayText["video"] as? String{
                singleArticle.videoLink = videoLink
                println("hre is video link")
                println(videoLink)
            }
            if let sity = arrayText["sity"] as? String{

                singleArticle.sity = sity
            }
            if let visible = arrayText["visible"] as? String{
                singleArticle.visible = visible

            }
            if let visits = arrayText["visits"] as? String{

                singleArticle.visits = visits
            }
            if let pubDate = arrayText["pubdate"] as? String{

                singleArticle.pubDate = pubDate
            }

            // insert result into array
            arrayNewSLenta.append(singleArticle)
        }
    }
    //cycle ended
    if isFirstReq == true {

        let urlStringSecondRequest = "http://www.kfdz/artifdcles/JsonMainList"
        CommonFunctions.JSONRequest(urlStringSecondRequest, tableName: tableView, action: desirializeJSONToArray, refresh: self.refreshController, category: 0, viewContr: self, hidLoadingViewAndStopAnimating)
    }
    isFirstReq = false
}

有趣的事实我注意到，当我第一次去vc并立即拉表时，由于某种原因它仅使用屏幕上的最后一行（在我的情况下为索引4）加载cellAtIndex函数。另一方面，当我去第一个vc并选择一些项目（看详细视图）然后回去拉桌子一切正常。 更多问题，当我将uipageviewcontroller的过渡样式更改为PageCurl时，我没有这个问题！

1 个答案:

答案 0 :(得分：1)

您可以在单个视图中使用3个表视图，而不是在第一个视图中使用容器视图，并将所有视图表放在不同的视图中，如下图所示：

enter image description here

每个创建的表视图需要1个文件。

这个bug可能会像那样消失

相关问题
最新问题