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What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?（18回答）
上个月关门了。
我正在创建集合视图与屏幕过渡，然后一个错误，这是“线程1：致命错误：在隐式解 Package Optional值”时意外发现nil。我附上了错误的图片。Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value的
我不知道该如何修复这个错误。下面是我的编程。

class MyCollectionViewCell: UICollectionViewCell {
    @IBOutlet var Mylabel :UILabel!
    @IBOutlet var Myimage :UIImageView!
    
    
    
    func setup(with hero: Hero) {
        Myimage.image = hero.image
        Mylabel.text = hero.name
        
    }
}

import UIKit

struct Hero {
    let name: String
    let image: UIImage
}

let heros: [Hero] = [
    Hero(name: "1", image: #imageLiteral(resourceName: "1.png")),
    Hero(name: "2", image: #imageLiteral(resourceName: "2.png")),
    Hero(name: "3", image: #imageLiteral(resourceName: "3.png")),
    Hero(name: "4", image: #imageLiteral(resourceName: "4.png")),
    Hero(name: "5", image: #imageLiteral(resourceName: "5.png"))
]

class ViewController: UIViewController {
    
   // var herosList = [Heros]()
    @IBOutlet weak var MyCollectionView: UICollectionView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        
        MyCollectionView.dataSource = self
        MyCollectionView.delegate = self
        MyCollectionView.collectionViewLayout = UICollectionViewFlowLayout()
        
        
    }

}
    
extension ViewController: UICollectionViewDataSource{
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return heros.count
    }
    
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCollectionViewCell", for: indexPath) as! MyCollectionViewCell
        cell.setup(with: heros[indexPath.row])
        return cell
    }
}
extension ViewController: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 82, height: 120)
    }
}
extension ViewController: UICollectionViewDelegate {
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
        let storyboard = UIStoryboard(name: "Main", bundle: nil) 
        guard let detailViewController = storyboard.instantiateViewController(withIdentifier: "DetailViewController") as? DetailViewController else {
            fatalError("Failed to instantiate DetailViewController from storyboard.")
        }
        
        detailViewController.sproduct = heros[indexPath.row]
        navigationController?.pushViewController(detailViewController, animated: true)
    }

我谷歌了一下。但我不知道