如何使用objective c延迟uicollectionview中的图像加载

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CellIdentifier" forIndexPath:indexPath];
    
    // 延迟加载图像
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            // 异步加载图像数据
            NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://example.com/image.jpg"]];
            
            dispatch_async(dispatch_get_main_queue(), ^{
                // 设置图像数据给UICollectionViewCell
                UIImage *image = [UIImage imageWithData:imageData];
                UIImageView *imageView = [cell viewWithTag:100];
                imageView.image = image;
                
                // 刷新UICollectionViewCell
                [collectionView reloadItemsAtIndexPaths:@[indexPath]];
            });
        });
    });
    
    return cell;
}