Issue Detecting Button cellForRowAt

The easiest and most efficient way in Swift is a callback closure.

• Subclass UITableViewCell, the viewWithTag way to identify UI elements is outdated.

• Set the class of the custom cell to the name of the subclass and set the identifier to ButtonCellIdentifier in Interface Builder.

• Add a callback property.

• Add an action and connect the button to the action.

  class ButtonCell: UITableViewCell {
  
      var callback : (() -> Void)?
  
      @IBAction func buttonPressed(_ sender : UIButton) {
         callback?()
      }
  }
  

• In cellForRow assign the callback to the custom cell.

  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
      let cell = tableView.dequeueReusableCell(withIdentifier: "ButtonCellIdentifier", for: indexPath) as! ButtonCell
       cell.callback = {
           print("Button pressed", indexPath)  
       }
       return cell
    }
  

• When the button is pressed the callback is called. The index path is captured.

Edit

There is a caveat if cells can be added or removed. In this case pass the UITableViewCell instance as parameter and get the index path from there

class ButtonCell: UITableViewCell {

    var callback : ((UITableViewCell) -> Void)?

    @IBAction func buttonPressed(_ sender : UIButton) {
       callback?(self)
    }
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
     let cell = tableView.dequeueReusableCell(withIdentifier: "ButtonCellIdentifier", for: indexPath) as! ButtonCell
     let item = dataSourceArray[indexPath.row]
     // do something with item
     cell.callback = { cell in
         let actualIndexPath = tableView.indexPath(for: cell)!
         print("Button pressed", actualIndexPath)  
     }
     return cell
  }

If even the section can change, well, then protocol/delegate may be more efficient.