Can't pass data through segue. Swift - ios

Question

I cannot pass variables through ViewControllers, even though I honestly think I have done all the necessities.
Game3ViewController:
class Game3ViewController: UIViewController, CLLocationManagerDelegate
{
var START = 1
var zombieMarkersCenters: [[Double]] = Array(repeating:Array(repeating:0, count:2), count:10)
var zombieHealth: [Int] = Array(repeating:100, count:10)
var HP = 100
var bullets = [0,0]
/* ... REST OF THE CODE */
override func viewDidAppear(_ animated: Bool)
{
/* here I assign values to the variables */
}
/* ... REST OF THE CODE */
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
if segue.identifier == "goToBackpack"
{
let Backpack4 = segue.destination as! Backpack4ViewController
Backpack4.zombieMarkersCentersBackpack = zombieMarkersCenters
Backpack4.bulletsBackpack = bullets
Backpack4.STARTBackpack = START
Backpack4.zombieHealthBackpack = zombieHealth
}
}
/* ACTIONS */
#IBAction func openBackpack(_ sender: Any)
{
performSegue(withIdentifier: "goToBackpack", sender: self)
timer.invalidate()
}
Backpack4ViewController:
class Backpack4ViewController: UIViewController
{
var zombieMarkersCentersBackpack = [[Double]]()
var bulletsBackpack = [Int]()
var STARTBackpack = Int()
var zombieHealthBackpack = [Int]()
override func viewDidLoad()
{
super.viewDidLoad()
print("WORKS?: ", bulletsBackpack, STARTBackpack, zombieHealthBackpack)
/* ... REST OF THE CODE */
And the print results with: [] 0 [], so I guess data passage has never happened. What should I do?

Answer 1

The problem is that this is not a method that will ever be called:
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
That's pointless; it won't be called, and your code will never run.
You need to write this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
Now your method will be called.