ios - UIButton image for normal state in collectionview cell repeats itself every four cells

Question

I'm trying to set an image for a button's normal state which is located in a collectionView cell. When the button is pressed the image changes. The problem is every four cells it repeats the same image as the original cell when the button is pressed. Is there a way to not have it repeat itself and when the button is pressed its only for that individual cell?

Here is the code:

class FavoritesCell: UICollectionViewCell {

  var isFavorite: Bool = false

  @IBOutlet weak var favoritesButton: UIButton!

  @IBAction func favoritesButtonPressed(_ sender: UIButton) {
        _ = self.isFavorite ? (self.isFavorite = false, self.favoritesButton.setImage(UIImage(named: "favUnselected"), for: .normal)) : (self.isFavorite = true, self.favoritesButton.setImage(UIImage(named: "favSelected"), for: .selected))

    }
}

I've tried doing this but for some strange reason the 'selected' state image is never shown even when the button is pressed:

let button = UIButton()

override func awakeFromNib() {
    super.awakeFromNib()

    button.setImage(UIImage(named: "favUnselected"), for: .normal)
    button.setImage(UIImage(named: "favSelected"), for: .selected)
}

Answer 1

The cell is most likely reused and your isFavorite is set to true.

Just try adding

func prepareForReuse() {
    super.prepareForReuse()
    self.isFavorite = false
}

This will set the button to original image when cell is to be reused.

Also since you have your button have two states for selected why do this dance

  _ = self.isFavorite ? (self.isFavorite = false, self.favoritesButton.setImage(UIImage(named: "favUnselected"), for: .normal)) : (self.isFavorite = true, self.favoritesButton.setImage(UIImage(named: "favSelected"), for: .selected))

where you could only say self.favoritesButton.selected = self.isFavorite

Change your cell code to:

class FavoritesCell: UICollectionViewCell {
    @IBOutlet weak var favoritesButton: UIButton!

    var isFavorite: Bool = false {
        didSet {
            favoritesButton.selected = isFavorite
        }
    }

    @IBAction func favoritesButtonPressed(_ sender: UIButton) {
        favoritesButton.selected = !favoritesButton.selected       
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        isFavorite = false
    }
}