Swift 3 Image Slider with button can't change imageview - swift

Question

There is image slider. I have made a image slider and each is button. I also change the image of button, and now I can't click the button in image slider to change the UIImageView "imgtoy". I want to click the button, then UIImageView will change to each photo in my choosetoy array. Anyone can help me? Here is my code:
#IBOutlet weak var imgtoy: UIImageView!
var itemImage: Int = 2
var imageName: String = ""
var imgBackground = [UIImage(named: "btnballicon.png"), UIImage(named: "btneastfin.png"), UIImage(named: "btnmarblefin.png"), UIImage(named: "btnplanefin.png"), UIImage(named: "btntoyfin.png")]
private let choosetoy = ["ballfin.png", "eastfin.png", "marblefin.png", "planefin.png", "toyfin.png"]
override func viewDidLoad() {
super.viewDidLoad()
imageName = choosetoy[itemImage]
self.imgtoy.image = UIImage(named: imageName)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imgBackground.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "foodCollectionViewCell", for: indexPath) as! foodCollectionViewCell
cell.imgfood.setImage(imgBackground[indexPath.row],for: UIControlState.normal)
itemImage = indexPath.row
return cell
}
#IBAction func choosetoy(_ sender: Any) {
if itemImage != nil {
imageName = choosetoy[itemImage]
self.imgtoy.image = UIImage(named: imageName)
}
}

Answer 1

Update code as below,
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "foodCollectionViewCell", for: indexPath) as! foodCollectionViewCell
cell.imgfood.setImage(imgBackground[indexPath.row],for: UIControlState.normal)
cell.imgfood.tag = indexPath.row
return cell
}
#IBAction func choosetoy(_ sender: UIButton) {
imageName = choosetoy[sender.tag]
self.imgtoy.image = UIImage(named: imageName)
}