iOS获取负责下载的活动地址

let session = URLSession.shared

let url = URL(string: "http://example.com/file.zip")
let downloadTask = session.downloadTask(with: url!)

class ViewController: UIViewController, URLSessionDownloadDelegate {
    // 下载完成后的处理
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        // 下载完成后的操作
    }
    
    // 下载进度的处理
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
        // 下载进度的操作
    }
}

downloadTask.resume()