如何将资源转换为UIImages以在UICollectionView中显示照片？

import UIKit

class PhotoCollectionViewCell: UICollectionViewCell {
    @IBOutlet weak var imageView: UIImageView!
}

class ViewController: UIViewController, UICollectionViewDataSource {
    @IBOutlet weak var collectionView: UICollectionView!
    
    var images: [UIImage] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 获取资源并转换为UIImages
        for i in 1...10 {
            if let image = UIImage(named: "photo\(i)") {
                images.append(image)
            }
        }
        
        // 注册UICollectionViewCell
        collectionView.register(UINib(nibName: "PhotoCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "PhotoCell")
        
        // 设置UICollectionView的数据源
        collectionView.dataSource = self
    }
    
    // UICollectionViewDataSource方法
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return images.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PhotoCell", for: indexPath) as! PhotoCollectionViewCell
        
        // 设置UICollectionViewCell的数据
        cell.imageView.image = images[indexPath.item]
        
        return cell
    }
}