How to access variable from one class in another? Swift Code - xcode

Question

I am having an issue getting one simple variable from one class to another and it is beyond extremely frustrating :/...
Here is the deal I have two view controller classes named: ViewController.swift and ViewController2.swift
ViewController.swift is linked to a storyboard that has sort of an inventory bag that I have placed which is just an image. Then there is an #IBAction for when you click on the bag it opens up and the second storyboard pops into view. This is controlled by ViewController2.swift. All I am looking to do is simply pass the center of the bag image from ViewController to ViewController2 but I can't seem to get it to work any help would be greatly appreciated.
class ViewController: UIViewController {
#IBOutlet weak var InventoryBag: UIImageView!
var bagCenter:CGPoint = CGPoint(x: 0, y: 0)
override func viewDidLoad() {
super.viewDidLoad()
#IBAction func InventoryButtonTapped(sender: UIButton) {
self.InventoryBag.image = UIImage(named: "backpackimageopen")
bagCenter = self.InventoryBag.center
func transferViewControllerVariables() -> (CGPoint){
return bagCenter
}
When I print the bagCenter from this ViewController it works properly and gives me a correct value. So the bagCenter variable I would like to somehow pass over to ViewController2.swift.
Here is what I tried from ViewController2.swift but it never seems to work and always gives me a 0 rather than the actual value.
class ViewController2: UIViewController {
#IBOutlet weak var HideButton: UIButton!
#IBOutlet weak var InventoryCollection: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//Load the center of the inventory bag to this view controller to align the hide button.
var bagCenter = ViewController().transferViewControllerVariables()
}
But when I do this it always results in a 0 and I don't get the actual coords of the bag that are showing up in ViewController1.

Answer 1

Create a following variable in ViewController2
var previousViewController: ViewController!
Add following line of code in your ViewController Class
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){
if segue.destinationViewController .isKindOfClass(ViewController2){
let vc2 = segue.destinationViewController as! ViewController2
vc2.previousViewController = self
}
}
Now in viewDidLoad method of ViewController2 you can access bagCenter like below:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
var bagCenter = previousViewController.transferViewControllerVariables()
}

Answer 2

Try this in view Controller
class ViewController: UIViewController {
#IBOutlet weak var InventoryBag: UIImageView!
var bagCenter:CGPoint = CGPoint(x: 0, y: 0)
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func InventoryButtonTapped(sender: AnyObject) {
self.InventoryBag.image = UIImage(named:"MAKEUP_SHARE.jpg")
bagCenter = self.InventoryBag.center
performSegueWithIdentifier("Go", sender: self)
}
// Give a segue identifier in storyboard
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "yoursegueidentifier" {
let dvc = segue.destinationViewController as? ViewController2
dvc!.bagCenter = bagCenter
}
}
}
and in view controller2
class ViewController2: UIViewController {
var bagCenter:CGPoint!
override func viewDidLoad() {
super.viewDidLoad()
print(bagCenter)
}
}