在Alamofire下载请求完成之前中止它

import Alamofire

// 创建下载请求
let destination: DownloadRequest.Destination = { _, _ in
    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let fileURL = documentsURL.appendingPathComponent("downloadedFile.jpg")
    return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}

let downloadRequest = AF.download("https://example.com/file.jpg", to: destination)

// 发起下载请求
downloadRequest.response { response in
    switch response.result {
    case .success(let fileURL):
        print("文件下载成功，保存在：\(fileURL)")
    case .failure(let error):
        if (error as NSError).code == NSURLErrorCancelled {
            print("下载请求被取消")
        } else {
            print("文件下载失败：\(error)")
        }
    }
}

// 中止下载请求
downloadRequest.cancel()