Question

我正在使用Alamofire将资产（图片/视频）上传为多部分表单数据。它适用于300MB（app）以下的文件大小。当我尝试上传大于300MB的文件时，应用程序崩溃了。

if let video = self.avPlayerItem?.asset as? AVURLAsset {
    if let assetData = NSData(contentsOfURL: video.URL) {
        multipartFormData.appendBodyPart(data: assetData, name: "file", fileName: "video", mimeType: "video/mp4") // Execution stops here
    }
}

我也从Xcode获得以下消息

我如何支持使用Alamofire上传大尺寸视频？

Answer 1

使用Stream上传而不是将文件转换为NSData，这会导致内存问题，并在上传大文件时发生崩溃。示例代码

  if let imageUrl = info[UIImagePickerControllerReferenceURL] as? NSURL{
        let assetLibrary = ALAssetsLibrary()
        assetLibrary.assetForURL(imageUrl , resultBlock: { (asset: ALAsset!) -> Void in
            if let actualAsset = asset as ALAsset? {
                let assetRep: ALAssetRepresentation = actualAsset.defaultRepresentation()

                let size = assetRep.size()
                let stream = NSInputStream(URL: assetRep.url())

                Alamofire.upload(
                    .POST,
                    "SERVER_URL",
                    headers: [:],
                    multipartFormData: { multipartFormData in

                         multipartFormData.appendBodyPart(stream: stream!, length: UInt64(size), name: "fileparameter", fileName: "fileName", mimeType: "video/mp4")

                    },
                    encodingCompletion: { encodingResult in
                        switch encodingResult {
                        case .Success(let upload, _, _):
                            upload.progress { bytesWritten, totalBytesWritten, totalBytesExpectedToWrite in
                                dispatch_async(dispatch_get_main_queue()) {
                                    let percent = (Float(totalBytesWritten) / Float(totalBytesExpectedToWrite))
                                    print(percent)
                                }
                            }
                            upload.validate()
                            upload.responseJSON { response in
                                print(response);
                            }
                        case .Failure(let encodingError):
                            print(encodingError)
                            let error = NSError(domain: "", code: 404, userInfo: [NSLocalizedDescriptionKey: "Image Uploading Failed. Please try again."])
                            let result = Result<AnyObject, NSError>.Failure(error)
                            let response = Response(request: nil, response: nil, data: nil, result: result)
                             print(response);

                        }
                    }
                )

            }
            }, failureBlock: { (error) -> Void in
        })
    }

Answer 2

Alamofire Documentation

将数据上传到服务器当使用JSON或URL编码的参数向服务器发送相对少量的数据时，request（）API通常就足够了。如果您需要从内存中的数据，文件URL或InputStream中发送大量数据，那么您将要使用upload（）API。

上传数据
$publicKey = (Get-Content .\keys\id_rsa.pub);
$publicKey = $publicKey.Trim();
$parametersObject = @{"sshPublicKey" = $publicKey }
上传文件
let data = Data("data".utf8)

AF.upload(data, to: "https://httpbin.org/post").responseJSON { response in
    debugPrint(response)
}
上传多部分表单数据
let fileURL = Bundle.main.url(forResource: "video", withExtension: "mov")

AF.upload(fileURL, to: "https://httpbin.org/post").responseJSON { response in
    debugPrint(response)
}
上传进度当您的用户正在等待上传到完成，有时可以方便地显示上传进度给用户。任何UploadRequest都可以报告使用上传和下载响应数据的进度 uploadProgress和downloadProgress API。
AF.upload(multipartFormData: { multipartFormData in
    multipartFormData.append(Data("one".utf8), withName: "one")
    multipartFormData.append(Data("two".utf8), withName: "two")
}, to: "https://httpbin.org/post")
    .responseJSON { response in
        debugPrint(response)
    }

Alamofire上传大文件

2 个答案: