如何使用Alamofire（帖子）上传图片？

Question

我必须发出一个API请求来上传一张图像，该图像是由相机拍摄的还是从图库中选取的。 API中设置的方法已设置，并且仅在body / parameters中

key:file
value: // 

其中值是图片本身。 （在邮递员中我只是从我的文件中上传了一张图片并且它有效）并且它返回一个带有其他信息的URL。问题是我无法获得成功响应的请求，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)")
                            }
                          })

我在控制台中得到的错误如下：

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

我尝试使用随机图片网址，但它也无效

Answer 1

您可以使用多部分数据上传图像，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)
    }

Answer 2

 {
        let id : String = UserDefaults.standard.string(forKey: "id")!
        print(id)

        self.view.makeToastActivity(.center)

        Alamofire.upload(multipartFormData: { (multipartFormData) in
            multipartFormData.append(UIImageJPEGRepresentation(self.imageView.image!, 0.5)!, withName: "profile_pic", fileName: "swift_file.jpeg", mimeType: "image/jpeg")
            for (key, value) in [“key”: "", ] {
                multipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
            }
        }, to:BaseURL + “base_url”)
        { (result) in
            switch result {
            case .success(let upload, _, _):

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

                upload.responseJSON { response in

                    if let JSON = response.result.value as? NSDictionary
                    {
                        print("JSON: \(JSON)")

                        let data = JSON["data"] as? NSArray


                        let status = JSON["status"] as? Int

                        if(status == 201)
                        {


                        }
                    }

                    self.view.hideToastActivity()
                }

            case .failure(let encodingError):
                //self.delegate?.showFailAlert()
                print(encodingError)
                self.view.hideToastActivity()
            }

        }
    }

Answer 3

使用Alamofire的上传方法在multipartFormData上传您的图片。我已经为你更新了代码。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)  
    }
}