使用 swift 3.0 和 xcode 8 的 AFNetworking：POST 请求和 GET 请求答案

【问题标题】：AFNetwoking with swift 3.0 & xcode 8 : POST Request & GET Request使用 swift 3.0 和 xcode 8 的 AFNetworking：POST 请求和 GET 请求
【发布时间】：2017-01-31 02:09:16
【问题描述】：

我正在尝试使用 AFNetworking & swift 3.0 和 xcode 8.0 解析数据，但出现如下错误。以下代码适用于 swift 2.3，但不适用于 3.0

或者，如果有人知道使用 xcode 8.0 进行 POST 和 GET 请求的 AFNetworking 和 swift 3.0，请告诉我。用简单的例子。提前致谢

你可以看到下面的错误。

 func callApi(apiName: String, param: [String : AnyObject]?, data: NSDictionary?, withMethod type: String, CompletionHandler:@escaping (_ code: Int, _ error:NSError?, _ response:AnyObject?) -> Void)

    {

        MBProgressHUD.showAdded(to: AppDelegateObj.window, animated: true)
        let str_URL : String = kHOSTPATH+apiName

        let manager: AFHTTPSessionManager = AFHTTPSessionManager()

        if (type == kREQ_POST) {

            manager.POST(str_URL, parameters: param, constructingBodyWithBlock: { (formData: AFMultipartFormData!) in

                if data?.allValues.count != 0 && data != nil
                {

                    let fileUrl = NSURL(fileURLWithPath: (data?.valueForKey("filePath"))! as! String)
                    try! formData.appendPartWithFileURL(fileUrl, name: (data?.valueForKey("key"))! as! String)
                }

                }, progress: { (NSProgress) in

                }, success: { (task:URLSessionDataTask, responseObject) -> Void in

                    CompletionHandler(code: 1, error: nil, response:responseObject)
                    MBProgressHUD.hideHUDForView(AppDelegateObj.window, animated: true)

                }, failure: { (task:URLSessionDataTask?, error:NSError) -> Void in

                    CompletionHandler(code: 0, error: error, response:nil)
                    MBProgressHUD.hideHUDForView(AppDelegateObj.window, animated: true)
            })
        }
        else {

            manager.GET(str_URL, parameters: param, progress: { (NSProgress) in

                }, success: { (task:URLSessionDataTask, responseObject) -> Void  in

                    CompletionHandler(code: 1, error: nil, response:responseObject)
                    MBProgressHUD.hideHUDForView(AppDelegateObj.window, animated: true)

                }, failure: { (task:URLSessionDataTask?, error:NSError) -> Void  in

                    CompletionHandler(code: 0, error: error, response:nil)
                    MBProgressHUD.hideHUDForView(AppDelegateObj.window, animated: true)
            })
        }
    }

但我遇到了这样的错误

cannot convert the value of type (URLSessionDataTask?,NSError)->Void to expected argument type '((URLSessionDataTask?,NSError)->Void)?'

【问题讨论】：

请参考链接(stackoverflow.com/questions/39508868/…) 对你有帮助。

标签： post get swift3 xcode8

【解决方案1】：

将错误类型从 NSERROR 更改为 ERROR。类型兼容性从 Swift2.3 更改为 Swift 3.0

【讨论】：

【解决方案2】：

试试这个：

func Get()
{
    let url = NSURL(string: Webserive.UserProfileInfoList + "/" + String(300))
    let request = NSURLRequest(url: url! as URL)

    NSURLConnection.sendAsynchronousRequest(request as URLRequest, queue: OperationQueue.main) {(response, data, error) in
        self.GetData(data: data! as NSData)
    }
}

func GetData(data:NSData){

    let dict: NSDictionary!=(try! JSONSerialization.jsonObject(with: data as Data, options: JSONSerialization.ReadingOptions.mutableContainers)) as! NSDictionary
    print(dict)
    self.PostData()
}

func PostData(){

    let parameters : NSMutableDictionary? = [

        "UserID": String(300),
        "UserProfileID": String(356)]

        let manager = AFHTTPSessionManager()

        let serializerRequest = AFJSONRequestSerializer()
        serializerRequest.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        manager.requestSerializer = serializerRequest

        let serializerResponse = AFJSONResponseSerializer()
        serializerResponse.readingOptions = JSONSerialization.ReadingOptions.allowFragments
        serializerResponse.acceptableContentTypes = ((((NSSet(object: "application/json") as! Set<String>) as Set<String>) as Set<String>) as Set<String>) as Set<String>;
        manager.responseSerializer = serializerResponse
        manager.post(Webserive.DefaultProfile, parameters: parameters, progress: nil, success: { (task: URLSessionDataTask, responseObject: Any?) in
        if (responseObject as? [String: AnyObject]) != nil {

             print("responseObject \(responseObject)")
        }
    }) { (task: URLSessionDataTask?, error: Error) in
        print("POST fails with error \(error)")
    }
}

【讨论】：

【解决方案3】：

我有类似的问题。不知道问题的根源是什么，但您可以通过不指定某些参数的类型来帮助自己，在这种情况下，POST 方法调用中的“错误”：

manager.post("http://...", parameters: [:], progress: nil, success: { (operation: URLSessionDataTask, responseObject: Any?) in
    print("Success")
}, failure: { (operation: URLSessionDataTask?, error) in
    let error = error as? Error
    print("Failure, error is \(error?.description)")
})

通过这个 Code Pattern，我可以使用 Xcode 8.3 和 Swift 3 构建代码。

编辑：

如果您对“无法转换类型的值...”有问题，请检查函数期望的类型。

我的问题是我将 Error 声明为 CoreData one，而 AFNetworking 肯定不会返回该错误类型。

class Error: NSManagedObject {
// Insert code here to add functionality to your managed object subclass
}

我需要改变的是：

(operation: URLSessionDataTask?, error: Error?)

到：

(operation: URLSessionDataTask?, error: Swift.Error?)

【讨论】：