在 Alamofire 4.0.0 中使用 Alamofire.upload 方法时，返回错误，我找不到解决方案

Question

if let img = ImageSelectorImg.image , imageSelected == true{

            let urlStr = "https://post.imageshack.us/upload_api.php"
            let url = URL(string: urlStr)!
            let imgData = UIImageJPEGRepresentation(img, 0.2)!
            let keyData = "AEHKL...66b".data(using: String.Encoding.utf8)!
            let keyJSON = "json".data(using: String.Encoding.utf8)!

            Alamofire.upload(.POST,url,multipartFormData: { multipartFormData in
                    multipartFormData.appendBodyPart(data: imgData, name: "fileupload", fileName:"image", mimeType: "image/jpg")
                    multipartFormData.appendBodyPart(data: keyData, name: "key")
                    multipartFormData.appendBodyPart(data: keyJSON, name: "format")
                },

                encodingCompletion: { encodingResult in

                    switch encodingResult {

                    case .success(let upload, _, _):

                        upload.responseJSON { response in

                            if let info = response.result.value as? Dictionary<String,AnyObject> {

                                if let links = info["links"] as? Dictionary<String,AnyObject> {

                                    if let imgLink = links["image_link"] as? String {
                                        self.postToFirebase(imgLink)
                                    }
                                }
                            }
                        }
                    case.failure(let _): break
                    }
            })
        }

当我运行上面的代码时，出现错误“对成员 'upload'(_:to:method:headers:) 的模糊引用”，我不确定解决方案是什么。请帮忙。谢谢。

Answer 1

您需要为 url 提供参数并删除方法名称。

Alamofire.upload(
multipartFormData: {multipartFormData in
                multipartFormData.appendBodyPart(data: imgData, name: "fileupload", fileName:"image", mimeType: "image/jpg")
                multipartFormData.appendBodyPart(data: keyData, name: "key")
                multipartFormData.appendBodyPart(data: keyJSON, name: "format")
            },
to: "https://httpbin.org/post", //URL,
encodingCompletion: { encodingResult in
    switch encodingResult {
    case .success(let upload, _, _):
        upload.responseJSON { response in
            debugPrint(response)
        }
        upload.uploadProgress(closure: { //Get Progress
                progress in
                    print(progress.fractionCompleted)
            })
    case .failure(let encodingError):
        print(encodingError)
    }
})

Answer 2

您使用的是较旧的 upload 语法。应该是：

if let img = ImageSelectorImg.image, imageSelected {
    let urlStr = "https://post.imageshack.us/upload_api.php"
    let url = URL(string: urlStr)!
    let imgData = UIImageJPEGRepresentation(img, 0.2)!
    let keyData = "AEHK...d66b".data(using: .utf8)!  // key removed for sake of privacy
    let keyJSON = "json".data(using: .utf8)!

    Alamofire.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(imgData, withName: "fileupload", fileName:"image", mimeType: "image/jpg")
        multipartFormData.append(keyData, withName: "key")
        multipartFormData.append(keyJSON, withName: "format")
    }, to: url, encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload.responseJSON { response in
                if let info = response.result.value as? [String: AnyObject],
                    let links = info["links"] as? [String: AnyObject],
                    let imgLink = links["image_link"] as? String {
                            self.postToFirebase(imgLink)
                }
            }
        case.failure(_): break
        }
    })
}

注意，method 参数默认为 .post，因此您不必提供该参数。