设置数据源和委托会使UITableView的应用程序崩溃

UITableView . 我不确定是否应该将数据源和数据控制器连接到视图控制器。这样做会使应用程序崩溃,但如果我不这样做,我在运行应用程序时在表视图中看不到任何输出。这应该如何工作?

class ViewController: UIViewController {    
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 2
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if section == 0 {
            return 1
        }
        else {
            return 2
        }
    }

    func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if section == 0 {
            return "One"
        } else {
            return "Two"
        }
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {


        let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "Cell") as! UITableViewCell


        let cellImage: UIImage = UIImage (named: "generic.png")!

        print("cell")

        if indexPath.section == 0 {
            cell.textLabel!.text = "Section 0, Row 0"
            cell.detailTextLabel!.text = "Detail goes here."
            cell.imageView!.image = cellImage
            print("inside cell1")
        }
        else{
            if indexPath.row == 0 {
                cell.textLabel!.text = "Section 1, Row 0"
                cell.detailTextLabel!.text = "Detail goes here."
                cell.imageView!.image = cellImage
                print("inside cell2")
            }
            else {
                cell.textLabel!.text = "Section 1, Row 1"
                cell.detailTextLabel!.text = "Detail goes here."
                cell.imageView!.image = cellImage
                print ("inside cell3")
            }
        }
        return cell
        }

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

}