谁能看到世界上为什么不会调用didSelectRowAtIndexPath？我已经delegate在代码和情节提要中对它进行了三重检查。

class AddCard: UIViewController,UIPopoverPresentationControllerDelegate, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var cardView: UIView!
@IBOutlet weak var tableView: UITableView!

let tableItems = ["Background Color","Background Image","Font Style","Font Color"]
let cellID = "cell"

override func viewDidLoad() {
    super.viewDidLoad()

    tableView.delegate = self
    tableView.dataSource = self
}

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

func setBackgroundColor (_ color: UIColor) {
    cardView.backgroundColor = color
}

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

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

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath as IndexPath)

    let row = indexPath.row
    cell.textLabel?.text = tableItems[row]

    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath as IndexPath, animated: true)
    print(indexPath.row)
    let row = indexPath.row
    switch(row){
    case 0:
        let popoverVC = storyboard?.instantiateViewController(withIdentifier: "colorPickerVC") as! ColorPickerViewController
        popoverVC.modalPresentationStyle = .popover
        popoverVC.preferredContentSize = CGSize(width: 284, height: 446)
        if let popoverController = popoverVC.popoverPresentationController {
            popoverController.sourceView = self.view
            popoverController.sourceRect = CGRect(x: 0, y: 0, width: 85, height: 30)
            popoverController.permittedArrowDirections = .any
            popoverController.delegate = self
            popoverVC.delegate = self
        }
        present(popoverVC, animated: true, completion: nil)
        break
    default: break

    }
}

}