为什么 CollectionView 不工作？

我有一个带有显示时间的按钮的 CollectionView（可单击）。

这是我的代码：

import UIKit

class CreateWindow: UIViewController, UICollectionViewDelegateFlowLayout {
    
    let reuseIdentifier = "cell" // also enter this string as the cell identifier in the storyboard
    var items = ["11:30","12:30","13:30","14:30","15:30","16:30"]

    @IBOutlet weak var collectionView: UICollectionView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        self.collectionView.delegate = self
        self.collectionView.dataSource = self
    }
    
}

extension CreateWindow: UICollectionViewDataSource, UICollectionViewDelegate{
    
    // MARK: - UICollectionViewDataSource protocol
    
    // tell the collection view how many cells to make
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        print(self.items.count)
        return self.items.count
    }
    
    // make a cell for each cell index path
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        print(self.items.count)
        // get a reference to our storyboard cell
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! TimeCollection
        
        // Use the outlet in our custom class to get a reference to the UILabel in the cell
        cell.TimeLabel.text = self.items[indexPath.item]
        cell.backgroundColor = UIColor.cyan // make cell more visible in our example project
        
        return cell
    }
    
    // MARK: - UICollectionViewDelegate protocol
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        // handle tap events
        print("You selected cell #\(indexPath.item)!")
    }
}

class TimeCollection: UICollectionViewCell {
    
    @IBOutlet weak var TimeLabel: UILabel!
    
}

这是我的故事板：

collectionView.delegate我尝试通过 swift 代码和故事板本身绑定到ViewController. 启动时，只有单元格数量功能起作用，但创建它们的功能不起作用（print不显示任何内容）有谁知道如何解决这个问题？

附加信息：

我的图层的屏幕截图（集合为空）

单元类声明

集合视图依赖项

单元依赖