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我正在尝试将我的应用程序更新到 Alamofire 5 并且由于我使用它的黑客方式而遇到困难，我猜。

无论如何，我需要后台上传，而 Alamofire 并不是真的为此而设计的。尽管如此，我还是用它来创建一个包含多部分表单的格式正确的文件，这样我就可以把它交给操作系统，以便稍后在后台上传。

我将在 Alamofire 4 中发布执行此操作的代码，我的问题是如何获取之前使用 encodingResults 获取的文件的 url？

// We're not actually going to upload photo via alamofire. It does not offer support for background uploads.
// Still we can use it to create a request and more importantly properly formatted file containing multipart form
                Api.alamofire.upload(
                    multipartFormData: { multipartFormData in
                        multipartFormData.append(imageData, withName: "photo[image]", fileName: filename, mimeType: "image/jpg")
                },
                    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 ""
                    usingThreshold: UInt64(0), // force alamofire to always write to file no matter how small the payload is
                    method: .post,
                    headers: Api.requestHeaders,
                    encodingCompletion: { encodingResult in

                        switch encodingResult {
                        case .success(let alamofireUploadTask, _, let url):
                            alamofireUploadTask.suspend()
                            defer { alamofireUploadTask.cancel() }
                            if let alamofireUploadFileUrl = url {                                
                                // we want to own the multipart file to avoid alamofire deleting it when we tell it to cancel its task
                                let fileUrl = ourFileUrl
                                do {
                                    try FileManager.default.copyItem(at: alamofireUploadFileUrl, to: fileUrl)
                                    // use the file we just created for a background upload
                                } catch {
                                }
                            }
                        case .failure:
                            // alamofire failed to encode the request file for some reason
                        }
                    }
                )
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1 回答 1

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多部分编码完全集成到 Alamofire 5 中的异步请求管道中。这意味着没有单独的步骤可供使用。但是，您可以MultipartFormData直接使用该类型，就像在请求闭包中一样。

let data = MultipartFormData()
data.append(Data(), withName: "dataName")
try data.encode()
于 2020-06-17T21:04:54.210 回答