ios - 如何使用 Alamofire 将多部分图像上传到服务器

Question

下面提到的是我将多部分图像上传到服务器的方法，但是当我尝试这样做时，应用程序崩溃“意外发现 nill”

但是图像的值(value)是存在的，因为我是从照片库中选择它的。

func createCoupon(_ code: String, storeID: Int, description: String, terms: String, image: UIImage, startDate: String, endDate: String, couponDiscount: String, minimumDiscount: String, percentage: String, maximumDiscount: String){
    let urlString = BaseURL + "create-coupon"
    let params =
        [
            "code"               :  code,
            "store_id"           :  storeID,
            "type"               :  "merchant",
            "description"        :  description,
            "terms"              :  terms,
            "start_date"         :  startDate,
            "end_date"           :  endDate,
            "coupon_discount"    :  couponDiscount,
            "minimum_total"      :  minimumDiscount,
            "percentage"         :  percentage,
            "maximum_discount"   :  maximumDiscount
            ] as [String : Any]

    let manager = Alamofire.SessionManager.default
    manager.session.configuration.timeoutIntervalForRequest = 30000
    Alamofire.upload(multipartFormData: { (multipartFormData) in
        multipartFormData.append(UIImageJPEGRepresentation(image, 0.2)!, withName: "image", fileName: "swift_file.jpeg", mimeType: "image/jpeg")
        for (key, value) in params {
            multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)
        }
    }, to:urlString)
    {
        (result) in
        switch result {
        case .success(let upload, _, _):

            upload.uploadProgress(closure: { (progress) in
                //Print progress
            })
            upload.responseJSON { response in
                let resJson = response.result.value
                print(resJson)
                NotificationCenter.default.post(name: Notification.Name(rawValue: NotifRequestSuccess.createCoupon.rawValue), object: nil, userInfo: ["data": resJson!])
            }

        case .failure(let encodingError):
            NotificationCenter.default.post(name: Notification.Name(rawValue: NotifRequestError.createCoupon.rawValue), object: encodingError, userInfo: nil)
        }
    }

Answer 1

Alamofire.upload(multipartFormData: { (multipartFormData) in
            multipartFormData.append(UIImageJPEGRepresentation(self.photoImageView.image!, 0.5)!, withName: "photo_path", fileName: "swift_file.jpeg", mimeType: "image/jpeg")
            for (key, value) in parameters {
                multipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
            }
            }, to:"http://server1/upload_img.php")
        { (result) in
            switch result {
            case .success(let upload, _, _):

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

                upload.responseJSON { response in
                    //self.delegate?.showSuccessAlert()
                    print(response.request)  // original URL request
                    print(response.response) // URL response
                    print(response.data)     // server data
                    print(response.result)   // result of response serialization
                    //                        self.showSuccesAlert()
                    //self.removeImage("frame", fileExtension: "txt")
                    if let JSON = response.result.value {
                        print("JSON: \(JSON)")
                    }
                }

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

        }