Alamofire 上传 照片

记录开发：上传文件和普通的json数据上传不一样，特别注意fileName,我因为fileName里的名字，后台得不到图片数据，或者是 图片数据得到不正确，很大可能是因为fileName 不正确，特意记录下，我搞了好久，记录自己，也提醒下遇到同样问题的同学。

 let fileName = Date().string(withFormat: "yyyymmddHHmmss") + ".jpg"
            RxAlamofire.upload(multipartFormData: {
                                   $0.append(data, withName: "image", fileName: fileName, mimeType: "image/jpg") 
//添加其他参数
                                    $0.append(bodyData!, withName: "body")

                               },
                               to: target.url,
                               method: .post,
                               headers: HTTPHeaders(Self.header)) //   HTTPHeaders(header)
                .flatMap {
                    $0.rx.responseString(encoding: .utf8)
                }
                .subscribe(onNext: { _, response in
                    Log("--- [response] --,\(response)")
//                    if let dict = response as? [String: Any] {
                    var jsonDecoding = JSONDecodingOptions()
                    jsonDecoding.ignoreUnknownFields = true
                    guard let model = try? type.self.init(jsonString: response, options: jsonDecoding) else {
                        return
                    }
                    signal.onNext(model)
//                    }
                }, onError: { error in
                    Log("---[error]--\(error)")
                    signal.onError(error)
                })
                .disposed(by: disposeBag)
            return Disposables.create()