在 Swift 中单击表视图单元格时如何显示新的视图控制器

Question

I am trying to show a new view controller when a table view cell is clicked. But my problem is when I click table view cell the new view controller does not appear. I already have looked at solutions on SO but it didn't work.

Here is a screenshot of storyboard

And here is the relevant code:

import UIKit

class RestaurantTableViewController: UITableViewController {

    let cellIdentifier: String = "restaurantCell"


    override func viewDidLoad() {
        super.viewDidLoad()
        self.tableView.delegate = self
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "restaurantSegue" {
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let destination = storyboard.instantiateViewController(withIdentifier: "RestaurantInfoViewController") as! RestaurantInfoViewController
            navigationController?.pushViewController(destination, animated: true)
        }
    }
}

extension RestaurantTableViewController {

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 0
    }

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

        return cell
    }

    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        self.performSegue(withIdentifier: "restaurantSegue", sender: self)
    }

}

Note: i also followed Apple's documentation in the link Apple's guide . But this didn't work as well

Answer 1

According to the screenshot the segue is connected to the table view cell.

If so delete didSelectRowAt because the segue is performed directly

 
 
  
   override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { self.performSegue(withIdentifier: "restaurantSegue", sender: self) }
 
 

The second issue is if you are using a segue you must not call instantiateViewController .

If you don't have to pass data to the next view controller you can even delete

 
 
  
   override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "restaurantSegue" { let storyboard = UIStoryboard(name: "Main", bundle: nil) let destination = storyboard.instantiateViewController(withIdentifier: "RestaurantInfoViewController") as! RestaurantInfoViewController navigationController?.pushViewController(destination, animated: true) } }
 
 

Otherwise get the destination controller from the segue in prepare(for and use that.

If the segue is still not performed then there's something wrong with the identifier.

Answer 2

You just need to make the segue.destination as your viewcontroller, no need to push it. The performSegue method will take care of it. Like this:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "restaurantSegue" {
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            segue.destination =  storyboard.instantiateViewController(withIdentifier: "RestaurantInfoViewController") as! RestaurantInfoViewController

        }
    }