Swift 如何使用Alamofire（post）上传图片？

我必须发出一个API请求才能上传一张照片，这张照片是由相机拍摄的还是从画廊中挑选的。API中设置的方法已设置，在主体/参数中只有

key:file
value: // 

其中值是图片本身。（在《邮递员》中，我只是从我的文件上传了一张图片，它就工作了），然后它返回一个包含其他信息的URL。 问题是我无法获得成功响应的请求，并且我不知道如何将UIImage传递给Alamofire。 这就是我所做的

Alamofire.request(baseUrl,
          method: .post,
          parameters: ["file" : expenseImage])
.responseJSON(completionHandler: { response in
                            guard response.result.error == nil else {
                                print("Error subiendo la imagen \n\(response.result.error!)")
                                return
                            }

                            guard let json = response.result.value as? [String: Any] else {
                                if let error = response.result.error {
                                    print("Error: \(error.localizedDescription)")
                                }
                                return
                            }
                            do {
                                let decoder = JSONDecoder()
                                let rawData = try JSONSerialization.data(withJSONObject: json, options: [])
                                let dataObject = try decoder.decode(PutObjectFile.self, from: rawData)
                                finished(dataObject)
                                print(dataObject)

                                print(dataObject.msg.file_info.url)
                            } catch let error {
                                print("Error decoding:\n\(error)")
                            }
                          })

我在控制台中遇到的错误如下：

responseSerializationFailed(reason: Alamofire.AFError
.ResponseSerializationFailureReason.inputDataNilOrZeroLength)

---

我尝试使用随机图片url，但也不起作用

使用Alamofire的上载方法在

multipartFormData中上载图像。我已经为您更新了代码。使用下面的代码

Alamofire.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(expenseImage, withName: "file",fileName: "file.jpg", mimeType: "image/jpg")
        },
with: baseUrl)
{ (result) in
    switch result {
    case .success(let upload, _, _):

        upload.uploadProgress(closure: { (progress) in
            print("Upload Progress: \(progress.fractionCompleted)")
        })

        upload.responseJSON { response in
             print(response.result.value)  
        }

    case .failure(let encodingError):
        print(encodingError)  
    }
}

您可以使用多部分数据上传图像，请使用以下代码：

let manager = Alamofire.SessionManager.default
    do{
        manager.upload(multipartFormData: { (formData) in
            if let fileData = fileData { // File data
                formData.append(fileData, withName: "FILE_NAME", fileName: "simple.jpeg", mimeType: "image/jpeg")
            }
        }, to: "API_PATH", method: HTTPMethod.post, headers: nil, encodingCompletion: { encoding in
            switch encoding{
            case .success(let req, _, _):
                req.uploadProgress(closure: { (prog) in
                    progress?(prog)
                }).responseJSON { (resObj) in
                    switch resObj.result{
                    case .success:
                        if let resData = resObj.data{
                            do {
                                let res = try JSONSerialization.jsonObject(with: resData)
                                print(res) // Success
                            } catch let err{
                                print(err)
                            }
                        }
                        break
                    case .failure(let err):
                        print(err)
                        break
                    }
                }
                break
            case .failure(let err):
                print(err)
                break
            }
        })
    }catch let err{
        print(err)
    }

我也遇到了同样的问题，我通过以下方式解决了它：
阿拉莫菲尔5.0.0-beta.5

AF.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(imgData, withName: "file",fileName: "file.jpg", mimeType: "image/jpg")
            },
        to: url).responseJSON
        { response in print(response)
            if let status = response.response?.statusCode {
                                print(status)
                            }
            //to get JSON return value
            if let result = response.value {
                let res = result as! [String: String]
                let newUrl:String = res["url"]!
                            print(newUrl)
            }
        }

我遇到此错误
无法使用类型为“（（CGFloat）->Data？，with name:String，fileName:String，mimeType:String）”的参数列表调用“append”
您需要将UIImage转换为数据，以便在formData中追加。你这样做了吗？现在我这样做了，我再次遇到这个错误
responseSerializationFailed（原因：Alamofire.AFError.responseSerializationFaileureReason.inputDataNilOrZeroLength）
它也不起作用：（
表达式类型'（）”在没有更多上下文的情况下是不明确的

AF.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(imgData, withName: "file",fileName: "file.jpg", mimeType: "image/jpg")
            },
        to: url).responseJSON
        { response in print(response)
            if let status = response.response?.statusCode {
                                print(status)
                            }
            //to get JSON return value
            if let result = response.value {
                let res = result as! [String: String]
                let newUrl:String = res["url"]!
                            print(newUrl)
            }
        }