Passing data between two TableViewControllers in Swift 4 does not work

Question

I am trying to get simple Int64 passed between 2 components in Swift, however, the value is never set.

This is my first tableViewController where I want to pass the data 2 from:

func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){
        if (segue.identifier == "transactionDetailSegue") {
            let transactionDetailViewController = segue.destination as? TransactionDetailTableViewController
            transactionDetailViewController?.id = 2
        }
    }

And this is where I want to receive it:

import UIKit

class TransactionDetailTableViewController: UITableViewController {

    @IBOutlet weak var nameText: UILabel!

    var id = 0;

    override func viewDidLoad() {
        super.viewDidLoad()
        dump(id)
    }

}

I made sure twice that the segue identifier is the right one, and checked various tutorials, but I am still not sure what goes wrong.

Thank you

Possible duplicate of [Pass data through segue](https://stackoverflow.com/questions/26207846/pass-data-through-segue) — dahiya_boy, Aug 24 '18 at 07:55
Try to add a breakpoint inside the `if` and make sure it got called — Tj3n, Aug 24 '18 at 07:55

score 1 · Accepted Answer · answered Aug 24 '18 at 08:00

1

The signature of prepareForSegue is wrong therefore it's never going to be called.

In Swift 3+ the correct signature is

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

and force unwrap TransactionDetailTableViewController

let transactionDetailViewController = segue.destination as! TransactionDetailTableViewController

If everything is hooked up correctly the code must not crash. If it does it reveals a design mistake.

answered Aug 24 '18 at 08:00

vadian

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The declaration of the function was not right in fact, this solved my problem, thanks! – BarniPro Aug 24 '18 at 08:37

Passing data between two TableViewControllers in Swift 4 does not work

1 Answers1