如何使用 Alamofire 5 处理后台上传？

Question

后台上传有可能通过以下代码对 alamofire api 和 URLSession 进行一些修改：

Alamofire.upload(
                multipartFormData: { multipartFormData in
                    multipartFormData.append(imageData, withName: "photo[image]", fileName: filename, mimeType: "image/jpg")
            },
                usingThreshold: UInt64(0), // force alamofire to always write to file no matter how small the payload is
                to: "http://", // if we give it a real url sometimes alamofire will attempt the first upload. I don't want to let it get to our servers but it fails if I feed it ""
                method: .post,
                headers: headers,
                encodingCompletion: { encodingResult in
                    switch encodingResult {
                    case .success(let alamofireUploadTask, _, let url):
                        alamofireUploadTask.suspend()
                        defer { alamofireUploadTask.cancel() }
                        if let alamofireUploadFileUrl = url {
                            var request = URLRequest(url: URL(string: "https://yourserver.com/photoUploadEndpoint")!)
                            request.httpMethod = "POST"
                            for (key, value) in alamofireUploadTask.request!.allHTTPHeaderFields! { // transfer headers from the request made by alamofire
                                request.addValue(value, forHTTPHeaderField: key)
                            }
                            // we want to own the multipart file to avoid alamofire deleting it when we tell it to cancel its task
                            // so copy file on alamofireUploadFileUrl to a file you control
                            // dispatch the request to the background session
                            // don't forget to delete the file when you're done uploading
                        } else {
                            // alamofire failed to encode the request file for some reason
                        }
                    case .failure:
                        // alamofire failed to encode the request file for some reason
                    }
            }
            )

不幸的是，这不适用于 Alamofire 5，有没有办法适应它？

Answer 1

Alamofire 5不支持后台URLSessionConfigurations，但是你贴的代码只是分段上传，还是支持就好了。

您应该针对新版本的 Alamofire 重新评估有关上传的各种黑客行为。这真的没有任何意义。

Alamofire 可以处理后台任务，这可以让您有时间完成上传。你可以阅读更多here。