get indexPath of UITableViewCell on click of Button from Cell - ios

Question

I have a button (red color cross) in the UITableViewCell and on click of that button I want to get indexPath of the UITableViewCell.
Right now I am assigning tag to each of the button like this
cell.closeButton.tag = indexPath.section
and the on click of the button I get the indexPath.section value like this:
#IBAction func closeImageButtonPressed(sender: AnyObject) {
data.removeAtIndex(sender.tag)
tableView.reloadData()
}
Is this the right way of implementation or is there any other clean way to do this?

Answer 1

Use Delegates:
MyCell.swift:
import UIKit
//1. delegate method
protocol MyCellDelegate: AnyObject {
func btnCloseTapped(cell: MyCell)
}
class MyCell: UICollectionViewCell {
#IBOutlet var btnClose: UIButton!
//2. create delegate variable
weak var delegate: MyCellDelegate?
//3. assign this action to close button
#IBAction func btnCloseTapped(sender: AnyObject) {
//4. call delegate method
//check delegate is not nil with `?`
delegate?.btnCloseTapped(cell: self)
}
}
MyViewController.swift:
//5. Conform to delegate method
class MyViewController: UIViewController, MyCellDelegate, UITableViewDataSource,UITableViewDelegate {
//6. Implement Delegate Method
func btnCloseTapped(cell: MyCell) {
//Get the indexpath of cell where button was tapped
let indexPath = self.collectionView.indexPathForCell(cell)
print(indexPath!.row)
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MyCell") as! MyCell
//7. delegate view controller instance to the cell
cell.delegate = self
return cell
}
}

Answer 2

How to get cell indexPath for tapping button in Swift 4 with button selector
#objc func buttonClicked(_sender:UIButton){
let buttonPosition = sender.convert(CGPoint.zero, to: self.tableView)
let indexPath = self.tableView.indexPathForRow(at:buttonPosition)
let cell = self.tableView.cellForRow(at: indexPath) as! UITableViewCell
print(cell.itemLabel.text)//print or get item
}

Answer 3

Try with the best use of swift closures : Simple, Quick & Easy.
In cellForRowAtIndexPath method:
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCellIdentifier", for: indexPath) as! CustomCell
cell.btnTick.mk_addTapHandler { (btn) in
print("You can use here also directly : \(indexPath.row)")
self.btnTapped(btn: btn, indexPath: indexPath)
}
Selector Method for external use out of cellForRowAtIndexPath method:
func btnTapped(btn:UIButton, indexPath:IndexPath) {
print("IndexPath : \(indexPath.row)")
}
Extension for UIButton :
extension UIButton {
private class Action {
var action: (UIButton) -> Void
init(action: #escaping (UIButton) -> Void) {
self.action = action
}
}
private struct AssociatedKeys {
static var ActionTapped = "actionTapped"
}
private var tapAction: Action? {
set { objc_setAssociatedObject(self, &AssociatedKeys.ActionTapped, newValue, .OBJC_ASSOCIATION_RETAIN) }
get { return objc_getAssociatedObject(self, &AssociatedKeys.ActionTapped) as? Action }
}
#objc dynamic private func handleAction(_ recognizer: UIButton) {
tapAction?.action(recognizer)
}
func mk_addTapHandler(action: #escaping (UIButton) -> Void) {
self.addTarget(self, action: #selector(handleAction(_:)), for: .touchUpInside)
tapAction = Action(action: action)
}
}

Answer 4

In Swift 4 , just use this:
func buttonTapped(_ sender: UIButton) {
let buttonPostion = sender.convert(sender.bounds.origin, to: tableView)
if let indexPath = tableView.indexPathForRow(at: buttonPostion) {
let rowIndex = indexPath.row
}
}

Answer 5

You can also get NSIndexPath from CGPoint this way:
#IBAction func closeImageButtonPressed(sender: AnyObject) {
var buttonPosition = sender.convertPoint(CGPointZero, to: self.tableView)
var indexPath = self.tableView.indexPathForRow(atPoint: buttonPosition)!
}

Answer 6

Create a custom class of UIButton and declare a stored property like this and use it to retrieve assigned indexPath from callFroRowAtIndexPath.
class VUIButton: UIButton {
var indexPath: NSIndexPath = NSIndexPath()
}
This is the full proof solution that your indexPath will never be wrong in any condition. Try once.

Answer 7

//
// ViewController.swift
// Table
//
// Created by Ngugi Nduung'u on 24/08/2017.
// Copyright © 2017 Ngugi Ndung'u. All rights reserved.
//
import UIKit
class ViewController: UITableViewController{
let identifier = "cellId"
var items = ["item1", "2", "3"]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.title = "Table"
tableView.register(MyClass.self, forCellReuseIdentifier: "cellId")
}
//Return number of cells you need
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return items.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! MyClass
cell.controller = self
cell.label.text = items[indexPath.row]
return cell
}
// Delete a cell when delete button on cell is clicked
func delete(cell: UITableViewCell){
print("delete")
if let deletePath = tableView.indexPath(for: cell){
items.remove(at: deletePath.row)
tableView.deleteRows(at: [deletePath], with: .automatic)
}
}
}
class MyClass : UITableViewCell{
var controller : ViewController?
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
setUpViews()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
fatalError("init(coder:) has not been implemented")
}
let label : UILabel = {
let label = UILabel()
label.text = "My very first cell"
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
let btn : UIButton = {
let bt = UIButton(type: .system)
bt.translatesAutoresizingMaskIntoConstraints = false
bt.setTitle("Delete", for: .normal)
bt.setTitleColor(.red, for: .normal)
return bt
}()
func handleDelete(){
controller?.delete(cell: self)
}
func setUpViews(){
addSubview(label)
addSubview(btn)
btn.addTarget(self, action: #selector(MyClass.handleDelete), for: .touchUpInside)
btn.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
label.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 16).isActive = true
label.widthAnchor.constraint(equalTo: self.widthAnchor , multiplier: 0.8).isActive = true
label.rightAnchor.constraint(equalTo: btn.leftAnchor).isActive = true
}
}
Here is a full example that will answer your question.

Answer 8

In your cellForRow:
#import <objc/runtime.h>
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
setAssociatedObject(object: YOURBUTTON, key: KEYSTRING, value: indexPath)
}
#IBAction func closeImageButtonPressed(sender: AnyObject) {
let val = getAssociatedObject(object: sender, key: KEYSTROKING)
}
Here val is your indexPath object, your can pass any object like you can assign pass cell object and get it in button action.

Answer 9

try this:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = (tableView.dequeueReusableCell(withIdentifier: "MainViewCell", forIndexPath: indexPath) as! MainTableViewCell)
cell.myButton().addTarget(self, action: Selector("myClickEvent:event:"), forControlEvents: .touchUpInside)
return cell
}
this function get the position of row click
#IBAction func myClickEvent(_ sender: Any, event: Any) {
var touches = event.allTouches()!
var touch = touches.first!
var currentTouchPosition = touch.location(inView: feedsList)
var indexPath = feedsList.indexPathForRow(atPoint: currentTouchPosition)!
print("position:\(indexPath.row)")
}

Answer 10

class MyCell: UICollectionViewCell {
#IBOutlet weak var btnPlus: UIButton!
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) ->
UITableViewCell {
cell.btnPlus.addTarget(self, action: #selector(increment_Action(sender:)),
for: .touchUpInside)
cell.btnPlus.tag = indexPath.row
cell.btnPlus.superview?.tag = indexPath.section
}
#objc func increment_Action(sender: UIButton) {
let btn = sender as! UIButton
let section = btn.superview?.tag ?? 0
let row = sender.tag
}