在類函式中呼叫Alamofire時出錯

我正在使用 Alamofire 來獲取資料。URLRequestConvertible 協議用于構造請求。當通過 Alamofire 在請求的類函式中呼叫 URLRequestConvertible 列舉時，我收到一個錯誤，如（Invalid conversion from throwing function of type '(AFDataResponse) throws -> Void' (aka '(DataResponse<Any, AFError>) throws -> ()') 到非拋出函式型別 '(AFDataResponse) -> Void' (aka '(DataResponse<Any, AFError>) -> ( )')).在請求的函式中，我正在獲取結果如何使用泛型？Q1：獲取結果時出錯 Q2：如何在函式中使用泛型

URLRequestConvertible 列舉：

enum Router: URLRequestConvertible{
    case getAllDishes
    var bseUrl : URL{
        return URL(string: "https://yummie.glitch.me/")!
    }
    var method: HTTPMethod{
        switch self {
        default:
            return .get
        }
    }
    var path:String{
        switch self{
        case .getAllDishes:
            return "dish-categories"
        }
    }
    func asURLRequest() throws -> URLRequest {
        let url = bseUrl.appendingPathComponent(path)
        var request =  URLRequest(url: url)
        request.method = method
        return request
    }
}

呼叫請求的函式：

class NetworkLayer{
    class func requested(_ request:Router,completion:@escaping(Result<Data,Error>) -> Void){
        ProgressHUD.show() //if response comes that loader run
        AF.request(request).responseJSON{ (response) in
            switch response.result{
                case .success(let data):
                    do{
                        let getDishesData = data as? [String:Any]
                        let resp = try JSONSerialization.data(withJSONObject: getDishesData?["data"], options: .prettyPrinted)
                        completion(.success(response))
                    }
                case .failure(let error):
                    completion(.failure(error))
            }
    }
    }

uj5u.com熱心網友回復：

您需要添加 Do-Catch 陳述句

catch – 如果 throwing 方法失敗并引發錯誤，則執行將落入此 catch 塊。

class NetworkLayer{
    class func requested(_ request:Router,completion:@escaping(Result<Data,Error>) -> Void){
        ProgressHUD.show() //if response comes that loader run
        AF.request(request).responseJSON{ (response) in
            switch response.result{
            case .success(let data):
                do{
                    let getDishesData = data as? [String:Any]
                    let resp = try JSONSerialization.data(withJSONObject: getDishesData?["data"], options: .prettyPrinted)
                    completion(.success(response))
                }catch{
                    print(error)
                    completion(.failure(error))
                }
            case .failure(let error):
                completion(.failure(error))
            }
        }
    }
}

在這里給你的另一個建議是不需要做 JSONSerialization，因為 responseJSON 給你直接回應（Alamofire 會做 JSONSerialization）。

最終代碼

class NetworkLayer{
    class func requested(_ request:Router,completion:@escaping(Result<Data,Error>) -> Void){
        ProgressHUD.show() //if response comes that loader run
        AF.request(request).responseJSON{ (response) in
            switch response.result{
            case .success(let response):
                do{
                    print(response)
                    completion(.success(response))
                }catch{
                    print(error)
                    completion(.failure(error))
                }
            case .failure(let error):
                completion(.failure(error))
            }
        }
    }
}

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