How to pass data in selected cell to another view controller?

Question

The piece of code below prints the content of whichever cell is clicked on in my TableView.

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)  {
    print(self.cell[indexPath.row])
}

I want to use the result that is printed in a label on another ViewController.

How do I get the string value from the function and then use it on on the other view? My thought is to use a global variable but I need to get the string value out first.

Answer 1

For example, You can use simple organization of a singleton of another ViewController (SecondScreen) with var main (in case, as usual, when SecondScreen inited via a Storyboard):

class SecondScreen : UIViewController {
    // 1. add this var
    static var main : SecondScreen? = nil

    // 2. Your some UI element
    @IBOutlet weak var textButton: UIButton!

    // 3. add this method
    func updateUI(string : String) {
        textButton.setTitle(string, for: .normal)
    }

    // 4. setting a var
    override func viewDidLoad() {
        if SecondScreen.main == nil {
            SecondScreen.main = self
        }
    }

    // ... another your and standard methods
}

And you can update your SecondScreen like this:

    let v = SecondScreen.main
    v?.updateUI(string: "yourString")

Also I recommend you to call method async:

DispatchQueue.main.async {
    SecondScreen.main?.updateUI(withString : string)
}

I suggest you to learn more about singletons...