为什么数组(collCells)在swift中从不同的ViewController传递数组元素时显示为空?

我想将元素从数组(items2)传递到另一个数组(collCells),该数组位于不同的viewcoller中,但collCells显示的是一个空方括号

VC 1(stctView):-

var items = [Item]()
var items2 = [Item]()

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)
    if items[indexPath.row].checked == false{

        items[indexPath.row].checked = true
        items2.append(items[indexPath.row])
        saveData()
        saveData2()
        print(items2)

    }else {
        let remItem = items[indexPath.row]
        if let index:Int = self.items2.index(where: {$0.name == remItem.name && $0.checked == remItem.checked && $0.buyPrice == remItem.buyPrice && $0.rank == remItem.rank && $0.symbol == remItem.symbol}) {
            self.items2.remove(at: index)
        }
        saveData()
        saveData2()
        print(items2)
        items[indexPath.row].checked = false

    }
    tableView.reloadData()
}

func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "Collection" {
        let DVC = segue.destination as! CollectionViewController
        DVC.collCells = items2
    }
}

vc 2(CollectionViewController):-

class CollectionViewController: UICollectionViewController {

var collCells = [Item]()

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

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! CollectionViewCell

collCells = stctView.items2  

// Configure the cell
cell.coinName.text = collCells[indexPath.row].name
cell.buyPrice.text = "\(String(describing: collCells[indexPath.row].buyPrice))"
cell.rank.text = "\(String(describing: collCells[indexPath.row].rank))"

return cell
   }

}