Tableviewcontroller "cellForRowAtIndexPath" - index starts from 4, not 0 - ios

Question

I put three table view controllers on pageviewcontroller.
The pageviewcontroller loads middle vc.
When I go to the left vc, and pull table in order to reload - I have problem that on function cellForRowAtIndexPath the indexPath.row starts from 4, not 0.
Why does the indexPath.row start from 4 and not 0?
I think, it is not about code issue! I have error:
Cannot index empty buffer
I ve found the error. I dont know why does this happens but when I reload table (pulling it), for some reason, it takes the last row (in my case I have 4 rows on screen counting from 0) and uses it in cellAtIndex array. Every time before pulling data from internet I remove all elements from array. I changed that code, i did remove all elements before reloading and the error didnt appear. What's interesting I am using the same function on other vc and everything works.
I am making two request to download data:
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()
}
This is how I am making request in order to download two request
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)
}
I put the code above on viewdidload. This code is where I am reloading :
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)
}
This is all about tableview code and desirialization of json to array:
// 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
}
The interesting fact I noticed , when I go to first vc and pull table immediately, for some reason it load cellAtIndex function using only the last row on screen(in my case index 4). on the other hand, when I go to first vc and choose some item (to see detailed view) and go back and pull table everything works.
On more issue to say, when I change transition style of uipageviewcontroller to PageCurl I dont have this problem!

Answer 1

You can instead of using 3 table view in a single view, you should use the container view in the first view and put all the view tables in different views as shown in the picture below :
You need 1 file for each table view created.
the bug can probably disappear like that