Implement delegate method in Table View - swift

Question

I´have a table view with a custom cell. In this cell I have two buttons that are used for counting. One pluss button, and one minus button. These buttons should increment and decrease a counterLabel with 1.
I have done this in a project I did a long time ago, but then I used extensions, witch I don't do in this project. My problem is that I cannot figure out how to implement the delegate method that I used in the previous project.
I will show the code I'm trying, as an extension. This gives the error "Ambiguous reference to member 'tableView(_:numberOfRowsInSection:)'".
How should I correctly implement the delegate?
Main View Controller
import UIKit
class MainViewController: UIViewController, UITableViewDelegate {
let staticList: [ListItem] =
[
ListItem(item1: "item1", item2: "item2", item3: "item3")]
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return staticList.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: UITableViewCell
cell = tableView.dequeueReusableCell(withIdentifier: "MenuCell", for: indexPath)
if let customCell = cell as? MenuCell
{
let itemIndex = indexPath.row
let listItem = staticList[itemIndex]
customCell.item1Label.text = listItem.item1
customCell.item2Label.text = listItem.item2
customCell.item3Label.text = listItem.item3
customCell.counterLabel.text = "\(listItem.count)"
}
return cell
}
}
#IBOutlet weak var mainTableView: UITableView!
}
extension MainViewController: CountDelegate {
func didAddItemCell(cell: MainCell) {
let indexPath = tableView.indexPath(for: cell)!
staticList[indexPath.row].count += 1
cell.countLabel.text = "\(staticList[indexPath.row].count)"
}
func didSubtractItemCell(cell: MenuCell) {
let indexPath = tableView.indexPath(for: cell)!
if staticList[indexPath.row].count > 0 {
staticList[indexPath.row].count -= 1
cell.countLabel.text = "\(staticList[indexPath.row].count)"
}
}
}
Table View Cell file
import Foundation
import UIKit
protocol CountDelegate: NSObjectProtocol {
func didAddItemCell(cell: MainCell)
func didSubtractItemCell(cell: MainCell)
}
class MenuCell : UITableViewCell
{
#IBOutlet weak var item1Label: UILabel!
#IBOutlet weak var item2Label: UILabel!
#IBOutlet weak var item3Label: UILabel!
#IBOutlet weak var counterLabel: UILabel!
#IBOutlet weak var minusButton: UIButton!
#IBOutlet weak var plusButton: UIButton!
weak var delegate: CountDelegate?
#IBAction func minusButton(_ sender: UIButton)
{
delegate?.didAddItemCell(cell: self)
}
#IBAction func plusButton(_ sender: UIButton)
{
delegate?.didSubtractItemCell(cell: self)
}
}

Answer 1

The numberOfRowsInSection and cellForRowAt methods are not part of the UITableViewDelegate protocol but the UITableViewDataSource protocol. You therefore need to change add that protocol like this:
class MainViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
You will also need to implement this as well:
func numberOfSections(in tableView: UITableView) -> Int {
return 1 // Or whatever it should be
}