-[UIViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance XXX

class AppDelegate: UIResponder, UIApplicationDelegate {

import UIKit

var checkboxCellInfo = ["Field 1", "Field 2"]

class CheckboxQuestion: UIViewController {

@IBOutlet weak var tableView: UITableView!

//1. determine number of rows of cells to show data
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return checkboxCellInfo.count + 1
}

//2. inputs info into each cell from array 'cellInfo'
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell? {

    if indexPath.row <= checkboxCellInfo.count - 1 {

        let cell:CheckboxQuestionCellConnect = self.tableView.dequeueReusableCellWithIdentifier("CheckboxNumber") as! CheckboxQuestionCellConnect

        return cell

     } else {

        let cell:CheckboxQuestionCellConnect = self.tableView.dequeueReusableCellWithIdentifier("CheckboxAdd") as! CheckboxQuestionCellConnect

        return cell

    }
}

//3. determines height of each cell
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    return 60
}

override func viewDidLoad() {
    super.viewDidLoad()
}

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

override func viewDidLoad() {
    super.viewDidLoad()

    tableView.delegate = self
    tableView.dataSource = self
}

class ViewController: UIViewController
      ,UITableViewDataSource,UITableViewDelegate{

@interface YourClass : UIViewController <UITableViewDelegate,UITableViewDataSource>

@end

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;