Question

我有以下功能，每位用户返回课程：

func CoursesPerUser(controler: UIViewController, completionHandler: @escaping (Result<[Course]>) -> Void){

    Alamofire.request(Constants.API.Users + UserId() + Constants.API.CoursesPerUser + Token(), encoding: JSONEncoding.default).responseJSON { response in

        guard response.result.error == nil else {
            print(response.result.error!)
            completionHandler(.failure(response.result.error!))
            return
        }

        guard let json = response.result.value as? [[String: AnyObject]] else {
            print("Didn't get course objects as JSON from API")
            completionHandler(.failure(BackendError.objectSerialization(reason: "Did not get JSON array in response")))
            return
        }

        var courses:[Course] = []
        for element in json {
            if let courseResult = Course(json: element) {
                courses.append(courseResult)
            }
        }
        completionHandler(.success(courses))
    }
}

当我调用函数时，响应的值为nil。

NetworkManager.sharedInstance.CoursesPerUser(controler: controler) { response in

        print("Size of courses" + String(describing: response.value?.count))

}

我在函数CoursesPerUser中打印了每个元素，一切正常。我想知道我是不是以良好的方式处理结果。

Answer 1

我已经解决了这个问题。解决方案如下。

func CoursesPerUser(completionHandler: @escaping ([Course]?, NSError?) -> ()){

    Alamofire.request(Constants.API.Users + UserId() + Constants.API.CoursesPerUser + Token(), encoding: JSONEncoding.default).responseJSON { response in

        switch response.result {

        case .success :


            if let result: AnyObject = response.result.value as AnyObject? {

                if(response.response?.statusCode == 200){

                    var courses:[Course] = []

                    if let array = JSON(result).array {

                        for element in array {

                            if let course = Course(json: element) {

                                courses.append(course)

                            }

                        }
                    }

                    completionHandler(courses, nil)

                } else {

                    if let message = JSON(result)["message"].string {

                        print("Logg: " + message)

                    }
                }

            }

        case .failure(let error):

            completionHandler(nil, error as NSError?)
        }
    }
}



NetworkManager.sharedInstance.CoursesPerUser() { courses, error in

    if(error == nil) {

        print("Size of courses" + String(describing: courses.count))

    } else {

        print("Log: " + String(describing: error))

    }

}

completionHandler的响应为零

1 个答案: