关闭ViewController时停止下载

import UIKit

class DownloadViewController: UIViewController {
    var downloadTask: URLSessionDownloadTask?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 开始下载任务
        startDownload()
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        // 关闭ViewController时停止下载
        stopDownload()
    }
    
    func startDownload() {
        let url = URL(string: "https://example.com/file.zip")
        let session = URLSession.shared
        downloadTask = session.downloadTask(with: url!) { (location, response, error) in
            // 下载完成后的处理逻辑
        }
        downloadTask?.resume()
    }
    
    func stopDownload() {
        downloadTask?.cancel()
    }
}