Segue is not passing a value from my StoriesTableViewController to SingleArtCallViewController. Why could this be?

Question

If a user clicks on the table-item in my StoriesTableViewController, I need to pass the value of the id to the SingleArtCallViewController so that the SingleArtCallViewController can display the appropriate details.

Thing is, if I print the id of the item that the user has pressed on, it is correctly printing it. But it's not being received in the other ViewController. Can someone solve this problem for me?

StoriesTableViewController:

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    myIndex = indexPath.row

    finalId = idTable[myIndex]

    let story = stories[indexPath.row]
    ArtcallID = story.id


   performSegue(withIdentifier: "singleArtcall", sender: self)
}

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


print(ArtcallID + "is the index of the item that was selected")
   //this correctly prints the id
let id = segue.destination as! SingleArtcallViewController
    id.ArtcallID = ArtcallID
 //  print("id: ",id)

   }

SingleArtCallViewController:

var ArtcallID: String!

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        print("ArtcallID: ", ArtcallID)

        //If I print this I"m getting the result "ArtcallID:  some("")"


    }

Story.swift:

import Firebase

class Story
{
    var id: String = ""
    var text: String = ""
    var numberOfLikes = 0
    var numberOfAngry = 0
    let ref: DatabaseReference!
    var fundedAmt: Int = 0
    var targetAmt: Int = 0
    var perfCity: String = ""
    var targetDate: IntMax = 0
    var backers: Int = 0
    var fundedPercent: Int = 0
    var imageURL: String = ""

    init(text: String) {
        self.text = text
        ref = Database.database().reference().child("Fund").childByAutoId()
    }

    init(snapshot: DataSnapshot)
    {
        ref = snapshot.ref
        if let value = snapshot.value as? [String : Any] {
            text = value["artist_name"] as! String
            backers = value["total_backers"] as! Int
            perfCity = value["perf_location"] as! String
            fundedAmt = value["amount_funded"] as! Int
            targetAmt = value["target_amount"] as! Int
            fundedPercent = value["percent_funded"] as! Int

          //  numberOfLikes = value["numberOfLikes"] as! Int
          //  numberOfAngry = value["numberOfAngry"] as! Int
            id = snapshot.key
        }
    }

Answer 1

If I understand correctly what you are trying to achieve, and you created the segue by control dragging from prototype cell to SingleArtcallViewController:

The specific reason why code doesn't work is that prepare(for segue:...) runs earlier than tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath). More over you run prepare for segue twice.

If so, You don't need the method

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)

Just use prepare(for segue:...):

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let selectedRow = tableView.indexPathForSelectedRow?.row,
        let vc = segue.destination as? SingleArtcallViewController else {return}
    vc.artCallId = stories[selectedRow].id
}