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Hi!I have protocol AllNotebookDelegate:protocol AllNotebookDelegate: class { func passData(text: String,nameOfNotebook: String) }And also I have class AllNotebookCollectionVC with collectionView(didSelectRowAt:) method:class AllNotebookCollectionViewController: UICollectionViewController { //MARK: - Variables var notebookItems: [NotebookItem] = [] weak var delegate: AllNotebookDelegate? override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { let selectedItem = notebookItems[indexPath.item] delegate?.passData(text: selectedItem.text, nameOfNotebook: selectedItem.titleOfNotebook) // Present EditorVC let editorVC = storyboard!.instantiateViewController(withIdentifier: "editorVC") let navigationController = UINavigationController(rootViewController: editorVC) present(navigationController, animated: true, completion: nil) } }This is editorVC:class EditorViewController: UIViewController { //MARK: - Variables & Outlets @IBOutlet weak var textView: UITextView! //MARK: - Private methods override func viewDidLoad() { super.viewDidLoad() let allNotebookVC = storyboard?.instantiateViewController(withIdentifier: "allNotebookVC") as! AllNotebookCollectionViewController textView.text = "" allNotebookVC.delegate = self } extension EditorViewController: AllNotebookDelegate { func passData(text: String, nameOfNotebook: String) { titleOfNavigationBar = nameOfNotebook textView.text = nameOfNotebook }When I add a breakpoint at collectionView(cellForRowAt:) in AllNotebookVC debugger show me this:collectionViewUICollectionView0x00007fee26878c00indexPathIndexPath2 indicesselfScroll.AllNotebookCollectionViewController0x00007fee25c09b00UIKit.UICollectionViewControllerUICollectionViewControllernotebookItems[Scroll.NotebookItem]1 valuedelegateAllNotebookDelegate?nilnoneselectedItemScroll.NotebookItem0x0000600003add100titleOfNotebookString""nameOfImageOfNotebookString"wallper"textString""editorVCScroll.EditorViewController0x00007fee25e0f580UIKit.UIViewControllerUIViewControllertextViewUITextView?nilnonetitleOfNavigationBarString""navigationControllerUINavigationController0x00007fee27015200UIKit.UIViewControllerUIViewControllerSo, why delegate = nil?