UICollectionViewCell checkmark return nil

i tried to follow this But when i do cell.checkmarkView.checked = true it returns nil so everything crash. Here is my MyCollectionViewCell:

class MyCollectionViewCell: UICollectionViewCell {

@IBOutlet weak var myLabel: UILabel!

var checkmarkView: SSCheckMark!

override init(frame: CGRect) {
    super.init(frame: frame)
    checkmarkView = SSCheckMark(frame: CGRect(x: frame.width-40, y: 10, width: 35, height: 35))
    checkmarkView.backgroundColor = UIColor.white
    contentView.addSubview(checkmarkView)
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    //fatalError("init(coder:) has not been implemented")
}}

Could you help me understand what is wrong?

My collectionView cellforitemat...

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
    cell.myLabel.text = self.listCivics()[indexPath.item]
    cell.layer.borderWidth = 1
    cell.checkmarkView.checked = true
    return cell
}

Your cell is loaded from storyboard. Thus, init(frame:) is not called. You should initialize your checkmark in init(coder:) as well.

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    let contentBounds = contentView.bounds
    checkmarkView = SSCheckMark(frame: CGRect(x: contentBounds.width - 40, y: 10, width: 35, height: 35))
    checkmarkView.backgroundColor = UIColor.white
    // adapt to changes in cell size
    checkmarkView.autoresizingMask = [ .flexibleLeftMargin, .flexibleBottomMargin ] 
    contentView.addSubview(checkmarkView)
}