Delegate not working, data isn't being passed to view controller from selecting cell

I have a movie app that fetches an API and I'm trying to get set the movie image on the other view controller when I click on the cell. But the delegate is coming back as nil and nothing is happening.

If anyone knows how to fix this please help me out!

Movie Library VC

protocol LibraryVCDelegate {
    func didGetMovie(moive: String)
}
  
var movieDelegate: LibraryVCDelegate!


//Movie tapped, prints out the movie URL Image

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        guard let movieName = dataSource.itemIdentifier(for: indexPath) else {
            return
        }
   
        movieDelegate.didGetMovie(moive: movieName.image.original)
        print(movieName.image.original)
        let detailsVC = DetailsViewController()
        let navController = UINavigationController(rootViewController: detailsVC)
        
        present(navController, animated: true)
    }

Movie DetailsVC

// View did load I'm getting the delegate
    
let librayVC = LibraryVC()
librayVC.movieDelegate = self

//
extension DetailsViewController: LibraryVCDelegate {
    func didGetMovie(moive: String) {
        
        movieImage.image = UIImage(named: moive)
    }
}

Receiving nil and data isn't being passed.

Normally we should create protocol functions on ViewController B and should pass any updated UI value via delegates to ViewController A. For example consider LibraryVC as A, DetailsVC as B. So you need define protocols on DetailsVC like below,

protocol DetailsVCDelegate: AnyObject {
   func didGetMovie(movie: String)
}

Then declare delegate variable.

weak var delegate: DetailsVCDelegate?

Then triggered it where you need it.

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    delegate?.didGetMovie(movie: movieName.image.original)
}

But before you defined that protocol function on ViewController A.

extension LibraryViewController: DetailsVCDelegate {
func didGetMovie(movie: String) {
    movieImage.image = UIImage(named: moive)
}
}

And you should assign power during your navigation process on ViewController A as LibraryVC,

let details = DetailsVC()
details.delegate = self

This the proper way of passing any values between two view controllers. But in your case seems in your code, I think you want to update movies name on DetailsViewController instead of library view controller. So you should pass data by creating custom initialiser on DetailsViewController.

class DetailsViewController: UIViewController {
    
var imageName: String?

// this is a convenient way to create this view controller without a imageName
convenience init() {
    self.init(imageName: nil)
}

init(image: String?) {
    self.imageName = imageName
    super.init(nibName: nil, bundle: nil)
}

// if this view controller is loaded from a storyboard, imageName will be nil

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}
}
override func viewDidLoad() {
    super.viewDidLoad()
    movieImage.image = UIImage(named: self.imageName)
}