AlamoFire:如何在swift中获取下载镜像的文件大小？

import Alamofire

func downloadImage() {
    let imageUrl = "https://example.com/image.jpg" // 替换为实际的镜像文件地址
    
    Alamofire.download(imageUrl).responseData { response in
        if let error = response.error {
            print("下载失败：\(error)")
            return
        }
        
        if let destinationUrl = response.destinationURL {
            do {
                let attributes = try FileManager.default.attributesOfItem(atPath: destinationUrl.path)
                let fileSize = attributes[.size] as? Int64 ?? 0
                print("文件大小：\(fileSize) bytes")
            } catch {
                print("获取文件大小失败：\(error)")
            }
        }
    }
}

downloadImage()