check / uncheck the check box by tapping the cell in table view and how to know which cell has checked or unchecked

Question

i am new to ios swift 2.2 . I tried to create one table view with custom cell xib. and i am populating some data in my table view. And also i added one custom check box butt

Answer 1

In order to solve your issue, as @El Capitan mentioned, you will need to use the didSelectRowAtIndexPath method to change its states. Your codes should look something along the lines of this:

// Declare a variable which stores checked rows. UITableViewCell gets dequeued and restored as you scroll up and down, so it is best to store a reference of rows which has been checked
var rowsWhichAreChecked = [NSIndexPath]()

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
      let cell:FavCell = tableView.cellForRowAtIndexPath(indexPath) as! FavCell
      // cross checking for checked rows
      if(rowsWhichAreChecked.contains(indexPath) == false){
         cell.checkBox.isChecked = true
         rowsWhichAreChecked.append(indexPath) 
      }else{
         cell.checkBox.isChecked = false
         // remove the indexPath from rowsWhichAreCheckedArray
         if let checkedItemIndex = rowsWhichAreChecked.indexOf(indexPath){
            rowsWhichAreChecked.removeAtIndex(checkedItemIndex)
         }
      }
}

To redisplay cells which have been checked before after scrolling the rows out of view, at your cellForRowAtIndexPath, perform the same checking against rowsWhichAreChecked array and set its states accordingly.

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

let cell:FavCell = self.FavTableView.dequeueReusableCellWithIdentifier("FCell") as! FavCell
cell.FLabel1.text=arrDict[indexPath.section] .valueForKey("favourite_name") as? String
cell.FLabel2.text=arrDict[indexPath.section] .valueForKey("favourite_address") as? String


   if(rowsWhichAreChecked.contains(indexPath) == false){
         cell.checkBox.isChecked = true
    }else{
        cell.checkBox.isChecked = false
    }
  }
    return cell           
}

EDITED ANSWER

I have got your code to work but I had to make some modifications to your Checkbox class and ViewController

Checkbox.swift

class CheckBoxButton: UIButton {

    // Images
    let checkedImage = UIImage(named: "CheckBoxChecked")! as UIImage
    let uncheckedImage = UIImage(named: "CheckBoxUnChecked")! as UIImage

    // Bool property
    var isChecked: Bool = false {
        didSet{
            if isChecked == true {
                self.setImage(uncheckedImage, forState: .Normal)
            } else {
                self.setImage(checkedImage, forState: .Normal)
            }
        }
    }

    override func awakeFromNib() {
        self.userInteractionEnabled = false
//        self.addTarget(self, action: #selector(CheckBoxButton.buttonClicked(_:)), forControlEvents: UIControlEvents.TouchUpInside)
//        self.isChecked = false
    }

    func buttonClicked(sender: UIButton) {
        if sender == self {
            if isChecked == true {
                isChecked = false
            } else {
                isChecked = true
            }
        }
    }

}

ViewController.swift

class FavVC: UIViewController, UITableViewDelegate, UITableViewDataSource {


    @IBOutlet weak var FavTableView: UITableView!


    var rowsWhichAreChecked = [NSIndexPath]()

    //var FData = [FavouritesData]()

    var arrDict :NSMutableArray=[]

    let cellSpacingHeight: CGFloat = 5  // cell spacing from each cell in table view

    override func viewDidLoad() {

        self.FavTableView.delegate = self
        self.FavTableView.dataSource = self

        super.viewDidLoad()

        self.jsonParsingFromURL()

        let nib = UINib(nibName:"FavCell", bundle: nil)

        FavTableView.registerNib(nib, forCellReuseIdentifier: "FCell")

    }

    // web services method
    func jsonParsingFromURL ()
    {
//        let token = NSUserDefaults.standardUserDefaults().valueForKey("access_token") as? String

        let url = NSURL(string: "some url")

        let session = NSURLSession.sharedSession()

        let request = NSURLRequest(URL: url!)

        let dataTask = session.dataTaskWithRequest(request) { (data:NSData?, response:NSURLResponse?, error:NSError?) -> Void in
            // print("done, error: \(error)")

            if error == nil
            {

                dispatch_async(dispatch_get_main_queue())
                {
                    self.arrDict=(try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)) as! NSMutableArray
                    if (self.arrDict.count>0)
                    {
                        self.FavTableView.reloadData()
                    }
                }

            }


        }
        dataTask.resume()

//        
//        let StringUrl = "http"+token!

//        let url:NSURL = NSURL(string: StringUrl)!

//        if let JSONData = NSData(contentsOfURL: url)
//        {
//            if let json = (try? NSJSONSerialization.JSONObjectWithData(JSONData, options: [])) as? NSDictionary
//            {
//                for values in json
//                {
//                    self.FData.append()
//                }

//                if let reposArray = json["data"] as? [NSDictionary]
//                {
//                    
//                    for item in reposArray
//                    {
//                        let itemObj = item as? Dictionary
//                        
//                        let b_type = itemObj!["business_type"]?.valueForKey("type")
//                        
//                        //self.Resultcount.text = "\(b_type?.count) Results"
//                        
//                        if (b_type as? String == "Taxis")
//                        {
//                            
//                            self.FData.append(FavouritesData(json:item))
//                            
//                        }
//                    }
//                }

//            }
//        }

    }

    func numberOfSectionsInTableView(tableView: UITableView) -> Int
    {
//        return self.FData.count
        return self.arrDict.count
    }


    // number of rows
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        return 1
    }

    // height for each cell
    func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
    {
        return cellSpacingHeight
    }

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

        let cell:FavCell = self.FavTableView.dequeueReusableCellWithIdentifier("FCell") as! FavCell
        cell.FLabel1.text=arrDict[indexPath.section] .valueForKey("favourite_name") as? String
        cell.FLabel2.text=arrDict[indexPath.section] .valueForKey("favourite_address") as? String

        let isRowChecked = rowsWhichAreChecked.contains(indexPath)

        if(isRowChecked == true)
        {
            cell.checkbox.isChecked = true
            cell.checkbox.buttonClicked(cell.checkbox)
        }else{
            cell.checkbox.isChecked = false
            cell.checkbox.buttonClicked(cell.checkbox)
        }

    return cell
}

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let cell:FavCell = tableView.cellForRowAtIndexPath(indexPath) as! FavCell
        // cross checking for checked rows
        if(rowsWhichAreChecked.contains(indexPath) == false){
            cell.checkbox.isChecked = true
            cell.checkbox.buttonClicked(cell.checkbox)
            rowsWhichAreChecked.append(indexPath)
        }else{
            cell.checkbox.isChecked = false
            cell.checkbox.buttonClicked(cell.checkbox)
            // remove the indexPath from rowsWhichAreCheckedArray
            if let checkedItemIndex = rowsWhichAreChecked.indexOf(indexPath){
                rowsWhichAreChecked.removeAtIndex(checkedItemIndex)
            }
        }
    }


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

}