如何使用下载的属性在swift中更改UI

let url = URL(string: "下载资源的URL地址")
let session = URLSession(configuration: .default, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url!)
task.resume()

extension ViewController: URLSessionDownloadDelegate {
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        // 下载完成后的操作
        // 可以将下载的文件保存到本地，然后根据需要进行UI的更新
        let fileManager = FileManager.default
        let documentsURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!
        let destinationURL = documentsURL.appendingPathComponent(location.lastPathComponent)
        
        do {
            try fileManager.moveItem(at: location, to: destinationURL)
            // UI更新操作
            DispatchQueue.main.async {
                // 使用下载的属性来更改UI
                // 例如，更新UIImageView的图片
                let image = UIImage(contentsOfFile: destinationURL.path)
                self.imageView.image = image
            }
        } catch {
            print("Error: \(error)")
        }
    }
}