如何使用using预取委托使用AlamofireImage预取图像？

import AlamofireImage

class ImagePrefetchDelegate: ImagePrefetcherDelegate {
    func imagePrefetcher(_ imagePrefetcher: ImagePrefetcher, didPrefetchURL url: URL, finishedCount: Int, totalCount: Int) {
        // 预取图像完成时的回调
        print("预取图像完成：\(finishedCount)/\(totalCount)")
    }
    
    func imagePrefetcher(_ imagePrefetcher: ImagePrefetcher, didFinishWithTotalCount totalCount: Int, skippedCount: Int) {
        // 所有预取操作完成时的回调
        print("所有预取操作完成")
    }
}

let prefetchDelegate = ImagePrefetchDelegate()

let imageURLs = [
    URL(string: "https://example.com/image1.jpg")!,
    URL(string: "https://example.com/image2.jpg")!,
    URL(string: "https://example.com/image3.jpg")!
]

ImagePrefetcher(urls: imageURLs, options: nil, progress: nil, completion: {
    (skippedURLs, failedURLs, completedURLs) in
    // 预取操作完成时的回调
    print("预取操作完成")
}).start()

ImagePrefetcher(urls: imageURLs, options: nil, progress: {
    (skippedURLs, failedURLs, completedURLs) in
    // 预取进度更新时的回调
    let progress = Float(completedURLs.count) / Float(imageURLs.count)
    print("预取进度：\(progress * 100)%")
}, completion: {
    (skippedURLs, failedURLs, completedURLs) in
    // 预取操作完成时的回调
    print("预取操作完成")
}).start()

let prefetcher = ImagePrefetcher(urls: imageURLs, options: nil, progress: nil, completion: nil)
prefetcher.delegate = prefetchDelegate
prefetcher.start()