using didSelectItem for programmed UICollectionViewCell

Question

I have programmed a UICollectionView and when the cell is select I would like for it to go to another view cotroller. I am getting the error message of

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value.

    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let vc = storyboard?.instantiateViewController(withIdentifier: "twoVC") as? twoVC

        self.navigationController?.pushViewController(vc!, animated: true)
        //Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value     
    }

}

class twoVC : UIViewController {
    @IBOutlet var label : UILabel!

    @IBOutlet var photo : UIImageView!

}

Answer 1

You are force unwrapping vc so chances are that it is nil which means that likely "twoVC" is not the identifier for that view controller in the storyboard. Double check that in your storyboard: