Prepareforsegue not passing the appropriate value to destination Viewcontroller? - swift

Question

I have two viewcontrollers (one is tableVC) that I would like to pass information between. Here is code from that tableVC:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var rowSelected = indexPath.row
print(rowSelected) //always returns the correct integer
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destViewController: newController = segue.destination as! newController
newController.rowSelected = rowSelected
}
performSegue(withIdentifier: "rowSelected", sender: Any?.self)//segue to newController
}
And here is the code for the newController that I want the info to be passed to:
#IBOutlet weak var label: UILabel!
var rowSelected = Int()
override func viewDidLoad() {
super.viewDidLoad()
label.text = infoArray[rowSelected]
print(rowSelected) //always logs 0 to the console, regardless of cell selection
}
I thought I had set this up appropriately, but for whatever reason the index called to the infoArray is always 0, no matter what cell is selected in the tableVC. Not sure what the problem is.

Answer 1

write prepareForSegue in class scope/global scope. in your code prepareForSegue will never call because you are writing this inside the method. pass rowSelected in performSegue and get rowSelected value in prepareForSegue using sender or you can use indexPathForSelectedRow property of tableView.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
...
performSegue(withIdentifier: "rowSelected", sender: rowSelected)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: Any?) {
let rowSelected = sender as! Int
// or you can use indexPathForSelectedRow for getting row value
// let indexPath = self.tableView.indexPathForSelectedRow?
// let rowSelected = indexPath!.row
let destViewController: newController = segue.destination as! newController
newController.rowSelected = rowSelected
}

Answer 2

Need to use override in your function when you prepareForSegue
See below example code : -
Swift 3
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "ShowAttractionDetails" {
let detailViewController = segue.destination
as! AttractionDetailViewController
let myIndexPath = self.tableView.indexPathForSelectedRow!
let row = myIndexPath.row
detailViewController.webSite = webAddresses[row]
}
}
Swift 2.3
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "ShowAttractionDetails" {
let detailViewController = segue.destination
as! AttractionDetailViewController
let myIndexPath = self.tableView.indexPathForSelectedRow!
let row = myIndexPath.row
detailViewController.webSite = webAddresses[row]
}
}
Source - Segue from UITableViewCell Taps in Swift & TableView Navigation using Storyboards in Xcode 8