How to get the indexpath.row when an element is activated?

Question

I have a tableview with buttons and I want to use the indexpath.row when one of them is tapped. This is what I currently have, but it always is 0

var point =         


        

Answer 1

For Swift2.1

I found a way to do it, hopefully, it'll help.

let point = tableView.convertPoint(CGPoint.zero, fromView: sender)

    guard let indexPath = tableView.indexPathForRowAtPoint(point) else {
        fatalError("can't find point in tableView")
    }

Answer 2

Try using #selector to call the IBaction.In the cellforrowatindexpath

            cell.editButton.tag = indexPath.row
        cell.editButton.addTarget(self, action: #selector(editButtonPressed), for: .touchUpInside)

This way you can access the indexpath inside the method editButtonPressed

func editButtonPressed(_ sender: UIButton) {

print(sender.tag)//this value will be same as indexpath.row

}

Answer 3

USING A SINGLE TAG FOR ROWS AND SECTIONS

There is a simple way to use tags for transmitting the row/item AND the section of a TableView/CollectionView at the same time.

Encode the IndexPath for your UIView.tag in cellForRowAtIndexPath :

buttonForCell.tag = convertIndexPathToTag(with: indexPath)

Decode the IndexPath from your sender in your target selector:

    @IBAction func touchUpInsideButton(sender: UIButton, forEvent event: UIEvent) {

        var indexPathForButton = convertTagToIndexPath(from: sender)

    }

Encoder and Decoder:

func convertIndexPathToTag(indexPath: IndexPath) -> Int {
    var tag: Int = indexPath.row + (1_000_000 * indexPath.section)
    
    return tag
}

func convertTagToIndexPath(from sender: UIButton) -> IndexPath {
    var section: Int = Int((Float(sender.tag) / 1_000_000).rounded(.down))
    var row: Int = sender.tag - (1_000_000 * section)

    return IndexPath(row: row, section: section)
}

Provided that you don’t need more than 4294967296 rows/items on a 32bit device ;-) e.g.

• 42949 sections with 100_000 items/rows
• 4294 sections with 1_000_000 items/rows - (like in the example above)
• 429 sections with 10_000_000 items/rows

—-

WARNING: Keep in mind that when deleting or inserting rows/items in your TableView/CollectionView you have to reload all rows/items after your insertion/deletion point in order to keep the tag numbers of your buttons in sync with your model.

—-

Answer 4

After seeing Paulw11's suggestion of using a delegate callback, I wanted to elaborate on it slightly/put forward another, similar suggestion. Should you not want to use the delegate pattern you can utilise closures in swift as follows:

Your cell class:

class Cell: UITableViewCell {
    @IBOutlet var button: UIButton!

    var buttonAction: ((sender: AnyObject) -> Void)?

    @IBAction func buttonPressed(sender: AnyObject) {
        self.buttonAction?(sender)
    }
}

Your cellForRowAtIndexPath method:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! Cell
    cell.buttonAction = { (sender) in
        // Do whatever you want from your button here.
    }
    // OR
    cell.buttonAction = buttonPressed // <- Method on the view controller to handle button presses.
}

Answer 5

I found a very easy way to use for manage any cell in tableView and collectionView by using a Model class and this a work as perfectly.

There is indeed a much better way to handle this now. This will work for manage cell and value.

Here is my output(screenshot) so see this:

1. Its very simple to create model class, please follow the below procedure. Create swift class with name RNCheckedModel, write the code as below.

class RNCheckedModel: NSObject {

    var is_check = false
    var user_name = ""

    }

2. create your cell class

class InviteCell: UITableViewCell {

    @IBOutlet var imgProfileImage: UIImageView!
    @IBOutlet var btnCheck: UIButton!
    @IBOutlet var lblName: UILabel!
    @IBOutlet var lblEmail: UILabel!
    }

3. and finally use model class in your UIViewController when you use your UITableView.

    class RNInviteVC: UIViewController, UITableViewDelegate, UITableViewDataSource {


    @IBOutlet var inviteTableView: UITableView!
    @IBOutlet var btnInvite: UIButton!

    var checkArray : NSMutableArray = NSMutableArray()
    var userName : NSMutableArray = NSMutableArray()

    override func viewDidLoad() {
        super.viewDidLoad()
        btnInvite.layer.borderWidth = 1.5
        btnInvite.layer.cornerRadius = btnInvite.frame.height / 2
        btnInvite.layer.borderColor =  hexColor(hex: "#512DA8").cgColor

        var userName1 =["Olivia","Amelia","Emily","Isla","Ava","Lily","Sophia","Ella","Jessica","Mia","Grace","Evie","Sophie","Poppy","Isabella","Charlotte","Freya","Ruby","Daisy","Alice"]


        self.userName.removeAllObjects()
        for items in userName1 {
           print(items)


            let model = RNCheckedModel()
            model.user_name = items
            model.is_check = false
            self.userName.add(model)
        }
      }
     @IBAction func btnInviteClick(_ sender: Any) {

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell: InviteCell = inviteTableView.dequeueReusableCell(withIdentifier: "InviteCell", for: indexPath) as! InviteCell

        let image = UIImage(named: "ic_unchecked")
        cell.imgProfileImage.layer.borderWidth = 1.0
        cell.imgProfileImage.layer.masksToBounds = false
        cell.imgProfileImage.layer.borderColor = UIColor.white.cgColor
        cell.imgProfileImage.layer.cornerRadius =  cell.imgProfileImage.frame.size.width / 2
        cell.imgProfileImage.clipsToBounds = true

        let model = self.userName[indexPath.row] as! RNCheckedModel
        cell.lblName.text = model.user_name

        if (model.is_check) {
            cell.btnCheck.setImage(UIImage(named: "ic_checked"), for: UIControlState.normal)
        }
        else {
            cell.btnCheck.setImage(UIImage(named: "ic_unchecked"), for: UIControlState.normal)
        }

        cell.btnCheck.tag = indexPath.row
        cell.btnCheck.addTarget(self, action: #selector(self.btnCheck(_:)), for: .touchUpInside)

        cell.btnCheck.isUserInteractionEnabled = true

    return cell

    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 80

    }

    @objc func btnCheck(_ sender: UIButton) {

        let tag = sender.tag
        let indexPath = IndexPath(row: tag, section: 0)
        let cell: InviteCell = inviteTableView.dequeueReusableCell(withIdentifier: "InviteCell", for: indexPath) as! InviteCell

        let model = self.userName[indexPath.row] as! RNCheckedModel

        if (model.is_check) {

            model.is_check = false
            cell.btnCheck.setImage(UIImage(named: "ic_unchecked"), for: UIControlState.normal)

            checkArray.remove(model.user_name)
            if checkArray.count > 0 {
                btnInvite.setTitle("Invite (\(checkArray.count))", for: .normal)
                print(checkArray.count)
                UIView.performWithoutAnimation {
                    self.view.layoutIfNeeded()
                }
            } else {
                btnInvite.setTitle("Invite", for: .normal)
                UIView.performWithoutAnimation {
                    self.view.layoutIfNeeded()
                }
            }

        }else {

            model.is_check = true
            cell.btnCheck.setImage(UIImage(named: "ic_checked"), for: UIControlState.normal)

            checkArray.add(model.user_name)
            if checkArray.count > 0 {
                btnInvite.setTitle("Invite (\(checkArray.count))", for: .normal)
                UIView.performWithoutAnimation {
                self.view.layoutIfNeeded()
                }
            } else {
                 btnInvite.setTitle("Invite", for: .normal)
            }
        }

        self.inviteTableView.reloadData()
    }

    func hexColor(hex:String) -> UIColor {
        var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()

        if (cString.hasPrefix("#")) {
            cString.remove(at: cString.startIndex)
        }

        if ((cString.count) != 6) {
            return UIColor.gray
        }

        var rgbValue:UInt32 = 0
        Scanner(string: cString).scanHexInt32(&rgbValue)

        return UIColor(
            red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
            alpha: CGFloat(1.0)
        )
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

     }

Answer 6

Very Simple getting Index Path swift 4, 5

let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! Cell
cell.btn.tag = indexPath.row
cell.btn.addTarget(self, action: "buttonTapped:", forControlEvents: 
UIControlEvents.TouchUpInside)

How to get IndexPath Inside Btn Click :

func buttonTapped(_ sender: UIButton) {
     print(sender.tag)  
}