TableView重新加载数据未调用cellForRowAtIndexPath

Question

I am Using UITableView For Display some data. But I have Seperated the Datasource and Delegate Methods to another class. So my TableViewController is not having Any delegate Methods. They are in Seperate Class.

So when the tableview loads for the First Time, It loads the values. but when i use tableView.reloadData on a button click of a cell , It does not calls the cellForRawAtIndexPath Method. But it calls numberOfRawsInSection and other methods.

Here is my Controller Class

class AdvancedSearch: UITableViewController , PopOverViewDelegate{

@IBOutlet var model: AdvancedSearchDataModel!
let dataModel = AdvancedSearchDataModel()

override func viewDidLoad() {
    super.viewDidLoad()

    tableView.registerNib(UINib(nibName: "AgeCell", bundle: nil), forCellReuseIdentifier: "AgeCell")
    tableView.registerNib(UINib(nibName: "ExperienceCell", bundle: nil), forCellReuseIdentifier: "ExperienceCell")
    tableView.registerNib(UINib(nibName: "CityCell", bundle: nil), forCellReuseIdentifier: "CityCell")
    tableView.registerNib(UINib(nibName: "StateCell", bundle: nil), forCellReuseIdentifier: "StateCell")
    tableView.registerNib(UINib(nibName: "DateTimeCell", bundle: nil), forCellReuseIdentifier: "DateTimeCell")
    tableView.registerNib(UINib(nibName: "GenderCell", bundle: nil), forCellReuseIdentifier: "GenderCell")
    tableView.registerNib(UINib(nibName: "ResultButtonCell", bundle: nil), forCellReuseIdentifier: "ResultButtonCell")

    //tableView.dataSource = model
    //tableView.delegate = model
    tableView.separatorColor = UIColor.grayColor()
    tableView.allowsSelection = false
    tableView.separatorStyle = UITableViewCellSeparatorStyle.None

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    tableView.reloadData()
}




// MARK: - DropDown PopOver Delegates

func valueOfTheFieldWhenSelect(tableViewCell: UITableViewCell, value: String, indexPath: NSIndexPath) {

        let data = AdvancedSearchDataModel()
        data.buttonTitle = value
        self.tableView.delegate = data
        self.tableView.dataSource = data
        self.tableView.reloadData()

}

Here is my Datasource and Delegates in Seperate Class

class AdvancedSearchDataModel: NSObject , UITableViewDataSource , UITableViewDelegate , AdvanceSearchDropDownButtonDelegate , UIPopoverPresentationControllerDelegate {


let data = ["Age","Experience","City" , "State" , "Gender" , "Date and Time"]

// set this proprty in PopOverViewDelegate method
var buttonTitle : String?




// MARK: - TableView Datasource

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    print("Count : \(data.count)")
    return data.count + 1
}

   func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    switch indexPath.row {
    case 0:
        let cell = tableView.dequeueReusableCellWithIdentifier("AgeCell", forIndexPath: indexPath) as! AgeCell
        applyStyleForButton(cell.selectAge)
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)
        let additionalSeparator = UIView(frame: frame)
        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)

        if buttonTitle != nil {
            cell.selectAge.setTitle(buttonTitle, forState: .Normal)
        }

        cell.indexPath = indexPath
        cell.dropDownDelegate = self

        return cell
    case 1:
        let cell = tableView.dequeueReusableCellWithIdentifier("ExperienceCell", forIndexPath: indexPath) as! ExperienceCell
        applyStyleForButton(cell.selectExperinceBtn)
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)

        let additionalSeparator = UIView(frame: frame)

        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)
        return cell
    case 2:
        let cell = tableView.dequeueReusableCellWithIdentifier("CityCell", forIndexPath: indexPath) as! CityCell
        applyStyleForButton(cell.cityButton)
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)

        let additionalSeparator = UIView(frame: frame)

        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)
        return cell
    case 3:
        let cell = tableView.dequeueReusableCellWithIdentifier("StateCell", forIndexPath: indexPath) as! StateCell
        applyStyleForButton(cell.stateButton)
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)

        let additionalSeparator = UIView(frame: frame)

        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)
        return cell
    case 4:
        let cell = tableView.dequeueReusableCellWithIdentifier("GenderCell", forIndexPath: indexPath) as! GenderCell
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)

        let additionalSeparator = UIView(frame: frame)

        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)
        return cell
    case 5:
        let cell = tableView.dequeueReusableCellWithIdentifier("DateTimeCell", forIndexPath: indexPath) as! DateTimeCell
        applyStyleForButton(cell.datebutton)
        applyStyleForButton(cell.timeButton)
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)

        let additionalSeparator = UIView(frame: frame)

        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)
        return cell
    case 6:
        let cell = tableView.dequeueReusableCellWithIdentifier("ResultButtonCell", forIndexPath: indexPath) as! ResultButtonCell
        let frame = CGRectMake(0, cell.frame.size.height - 2, cell.frame.size.width,2)

        let additionalSeparator = UIView(frame: frame)

        additionalSeparator.backgroundColor = UIColor.grayColor()
        cell.addSubview(additionalSeparator)
        return cell
    default:
        return UITableViewCell()
    }




}



// MARK: - TableView Delegates

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

    if indexPath.row == 5 {
        return 150
    }else{
        return 94
    }

}

// MARK: - Styling

func applyStyleForButton(button : UIButton){

    button.layer.borderColor = UIColor.grayColor().CGColor
    button.layer.borderWidth = 1
    button.layer.cornerRadius = 5
    button.backgroundColor = UIColor.clearColor()

}


// MARK: - DropDown Delegates


func openAgeDropDown(by button: UIButton, and cell: AgeCell,indexPath : NSIndexPath)
{
    print("Age opened")
    let tableViewController = DropDownController(style: .Plain, menuItems: ["10","20","30"],cell: cell , index: indexPath)
    tableViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
    tableViewController.preferredContentSize = CGSizeMake(button.frame.width, button.frame.width)

    // assigning the delegate in tableView to fill the textfield
    tableViewController.delegate = AdvancedSearch()

    let popoverPresentationController = tableViewController.popoverPresentationController
    popoverPresentationController?.permittedArrowDirections = .Any
    popoverPresentationController?.delegate = self
    popoverPresentationController?.sourceView = button
    popoverPresentationController?.sourceRect = button.bounds

    UIApplication.sharedApplication().keyWindow?.rootViewController!.presentViewController(tableViewController, animated: true, completion: nil)

}


// MARK: - PopOver Delegates

  func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
    return UIModalPresentationStyle.None
}}

Please Guide me

Answer 1

The methods is not calling because everytime you are creating a new object of AdvancedSearchDataModel . instead this assign delegate in viewDidLoad. don't need to create new object of AdvancedSearchDataModel

in viewDidLoad

...
tableView.separatorColor = UIColor.grayColor()
tableView.allowsSelection = false
tableView.separatorStyle = UITableViewCellSeparatorStyle.None
tableView.delegate = self.model
 tableView.dataSource = self.model

and in valueOfTheFieldWhenSelect

func valueOfTheFieldWhenSelect(tableViewCell: UITableViewCell, value: String, indexPath: NSIndexPath) {

    self.model.buttonTitle = value
    self.tableView.reloadData()
 }