未将UIImage添加到UICollectionView中的所有单元格

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    
    var collectionView: UICollectionView!
    var images = [UIImage]() // 假设这里已经填充了UIImage对象
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let layout = UICollectionViewFlowLayout()
        layout.itemSize = CGSize(width: 100, height: 100)
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.dataSource = self
        collectionView.delegate = self
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")
        view.addSubview(collectionView)
    }
    
    // MARK: - UICollectionViewDataSource
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return images.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
        
        // 确保每次都更新单元格的内容
        if let imageView = cell.contentView.subviews.first as? UIImageView {
            imageView.image = images[indexPath.item]
        } else {
            let imageView = UIImageView(image: images[indexPath.item])
            imageView.frame = cell.contentView.bounds
            imageView.contentMode = .scaleAspectFit
            cell.contentView.addSubview(imageView)
        }
        
        return cell
    }
}