无法通过segue传递数据。敏捷的

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()
}

背包4ViewController:

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 */

打印结果为:[]0[],所以我猜数据通道从未发生过。我该怎么办?