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iOS Build a Playlist Browser with Swift Refactoring Our Code Wrapping Up!

i am trying to manage the fun facts app with different categories but something is going wrong

This is my view controller class, what is happening is that my assistFacts instance is being passed to the other view with a nil value and i don`t know why

import UIKit

class ViewController: UIViewController {

    var imagesArray:[UIImageView] = []

    @IBOutlet weak var ImageView0: UIImageView!

    @IBOutlet weak var ImageView1: UIImageView!

    @IBOutlet weak var ImageView2: UIImageView!

    @IBOutlet weak var ImageView3: UIImageView!


    override func viewDidLoad() {
        super.viewDidLoad()
        imagesArray.append(ImageView0)
        imagesArray.append(ImageView1)
        imagesArray.append(ImageView2)
        imagesArray.append(ImageView3)

        for index in 0..<imagesArray.count{
        let Instance = assistantFacts(index: index)
        let ImageIcons =  imagesArray[index]
       ImageIcons.image = Instance.Icon
       ImageIcons.backgroundColor = Instance.backgroundColor
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue == "ShowAnotherViewSegue"{


                let viewDestination = segue.destinationViewController as! ImportantViewController
                // posso usar as propriedades q estao na importanVIewController agr
            viewDestination.assistFacts = assistantFacts(index: 0)

        }
    }





    @IBAction func ShowFunFacts(sender: AnyObject) {
performSegueWithIdentifier("ShowAnotherViewSegue", sender: sender)
    }




}

this is my other view controller class

import UIKit

class ImportantViewController: UIViewController {


    @IBOutlet weak var FunFactsLabel: UILabel?

    @IBOutlet weak var SummaryLabel: UILabel?

    var assistFacts: assistantFacts?

    override func viewDidLoad() {
        super.viewDidLoad()

        if assistFacts == nil{
        print("ok")
        }

}

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }



    @IBAction func ShowAnotherFunFactButton(sender: AnyObject) {
        let AssistantFactsPicked = assistFacts!.funFactsArray
        let auxiliar = arc4random_uniform(UInt32(AssistantFactsPicked.count))
        let randomNumber = Int(auxiliar)
        FunFactsLabel?.text = AssistantFactsPicked[randomNumber]

    }