使用Alamofire上载图片，正文为零

Question

我一直在网上思考如何使用Alamofire上传图像，并得到了这个结果。我能够实现此解决方案，该解决方案从API收到200响应，但实际上并没有上传图像。似乎我要附加图像，但请求正文为nil。

[更具体地说，当我将图像Data附加到multiFormData时，我附加了图像，但请求的body为nil时发生了问题。因此，响应是成功的，但是API没有接收到图像，而是接收到具有零个图像的请求。

func upload(briefId: String,
            curationId: String,
            media: [Any]?,
            progressCompletion: @escaping (_ percent: Float) -> Void,
            completion: @escaping (_ mediaArray: [Media]) -> Void) {

    guard let media = media else {

        return
    }

    Alamofire.upload(multipartFormData: { multipartFormData in

        media.forEach { item in

            if item is UIImage {

                if let imageData = (item as? UIImage), let imgData = imageData.jpegData(compressionQuality: 0.5) {

                    let format = imgData.format
                    let uuid = UUID().uuidString


                    multipartFormData.append(imgData,
                                         withName: "media",
                                         fileName: "\(uuid).\(format)",
                                         mimeType: "image/jpeg")
                }

            }
        }

    },
        with: MediaUploadRouter.upload(briefId: briefId, curationId: curationId),
        encodingCompletion: { encodingResult in

                    print(encodingResult)

                    switch encodingResult {
                    case .success(let upload, _, _):

                    upload.uploadProgress { progress in

                        progressCompletion(Float(progress.fractionCompleted))
                    }

                    upload.validate()

                    upload.responseJSON { response in

                        print(response)

                        //3
                        completion([])
                    }

                    case .failure(let encodingError):

                        print(encodingError)
                    }
  })
}

正如我之前说过的，实际上我从200得到了API代码，但是API没有收到任何图像。

▿ [Request]: POST https://api/id123/curation/id789/media
[Timeline]: Timeline: { "Request Start Time": 613650563.882, "Initial Response Time": 613650579.293, "Request Completed Time": 613650579.298, "Serialization Completed Time": 613650579.298, "Latency": 15.412 secs, "Request Duration": 15.416 secs, "Serialization Duration": 0.000 secs, "Total Duration": 15.416 secs }
  ▿ request : Optional<URLRequest>
    ▿ some : https://api/id123/curation/id789/media
      ▿ url : Optional<URL>
        ▿ some : https://api/id123/curation/id789/media
          - _url : https://api/id123/curation/id789/media
      - cachePolicy : 0
      - timeoutInterval : 10000.0
      - mainDocumentURL : nil
      - networkServiceType : __C.NSURLRequestNetworkServiceType
      - allowsCellularAccess : true
      ▿ httpMethod : Optional<String>
        - some : "POST"
      ▿ allHTTPHeaderFields : Optional<Dictionary<String, String>>
        ▿ some : 2 elements
          ▿ 0 : 2 elements
            - key : "Content-Type"
            - value : "multipart/form-data; boundary=alamofire.boundary.fd461e96ba613621"
          ▿ 1 : 2 elements
            - key : "Authorization"
            - value : "Bearer tokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentoken-g”
      ▿ httpBody : Optional<Data>
        ▿ some : 0 bytes
          - count : 0
          ▿ pointer : 0x00007ffee83a0860
            - pointerValue : 140732794538080
          - bytes : 0 elements
      - httpBodyStream : nil
      - httpShouldHandleCookies : true
      - httpShouldUsePipelining : false
  ▿ response : Optional<NSHTTPURLResponse>
    - some : <NSHTTPURLResponse: 0x600000248da0> { URL: https://api/id123/curation/id789/media } { Status Code: 200, Headers {
    "Content-Type" =     (
        "application/json; charset=utf-8"
    );
    Date =     (
        "Fri, 12 Jun 2020 10:29:38 GMT"
    );
    Server =     (
        Kestrel
    );
    "Transfer-Encoding" =     (
        Identity
    );
} }

Answer 1

问题似乎出在media类型的参数[Any]?上。您确定要传递UIImage参数中的media吗？您可以通过提供其他条件来检查它：

if item is UIImage {

    if let imageData = (item as? UIImage), let imgData = imageData.jpegData(compressionQuality: 0.5) {

        let format = imgData.format
        let uuid = UUID().uuidString

        multipartFormData.append(imgData,
                             withName: "media",
                             fileName: "\(uuid).\(format)",
                             mimeType: "image/jpeg")
    } else {
        print("This was not an image.")
    }
}