这是我的代码：

import UIKit

class ViewController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    let transportItems =     ["Bus","Helicopter","Truck","Boat","Bicycle","Motorcycle","Plane","Train","Car","Scooter","Cara van"]

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return transportItems.count
}

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

    var cell = tableView.dequeueReusableCellWithIdentifier("SlopesCell") as? UITableViewCell

    cell?.textLabel?.text = transportItems[indexPath.row]
    return cell!
    }
}

一切都应该是这样的，但表视图只是显示多行，没有任何文本。
我哪里做错了？