Swift alamofire 重构试图返回状态码

Question

我已经开始重构我的 Alamofire api 调用，将它们保存在一个单独的文件中。唯一的问题是我也不知道如何返回状态码。

API 文件：

static func getCategories(_ catId: Int, response: @escaping (JSON) -> ()) {
        let urlString = baseURL + ResourcePath.categories(catId: catId).description
        Alamofire.request(urlString, encoding: JSONEncoding.default, headers: headers).responseJSON{ (responseData) -> Void in

            let cCatData = JSON(responseData.result.value ?? [])
            response(cCatData)

        }
    }

然后在我的 VC 中：

Api.getCategories(catId) { (JSON) -> () in
            self.categories = JSON["catData"]
            self.tableView.reloadData()
        }

但我需要知道状态码是否为 200/400/404/422/500 并且我不想使用 .validate() 函数，我想传递状态码

通常，如果我将所有内容都放在同一个文件中，我会通过以下方式获取状态代码：

Alamofire.request("https://www.something", parameters: parameters, encoding: JSONEncoding.default, headers: headers)
                        .responseJSON() { response in
                            if let statusCode = response.response?.statusCode { 

if statusCode == 200  {

}

}

Answer 1

如果你想让你的闭包回传状态码，那么添加一个Int?参数并传回：

static func getCategories(_ catId: Int, response: @escaping (JSON, Int?) -> ()) {
    let urlString = baseURL + ResourcePath.categories(catId: catId).description
    Alamofire.request(urlString, encoding: JSONEncoding.default, headers: headers).responseJSON { responseData in
        let cCatData = JSON(responseData.result.value ?? [])
        response(cCatData, responseData.response?.statusCode)
    }
}

或者我可能会使用更标准的变量/参数名称：

static func getCategories(_ catId: Int, completionHandler: @escaping (JSON, Int?) -> ()) {
    let urlString = baseURL + ResourcePath.categories(catId: catId).description
    Alamofire.request(urlString, encoding: JSONEncoding.default, headers: headers).responseJSON { response in
        let cCatData = JSON(response.result.value ?? [])
        completionHandler(cCatData, response.response?.statusCode)
    }
}

无论哪种方式，您都可以这样做：

Api.getCategories(catId) { json, statusCode in 
    guard statusCode == 200 else {
        print("status code not 200! \(statusCode)")
        return
    }

    // if you got here, the status code must have been 200
}

Answer 2

所以基本上你想要的是这样的：

func returnStatusCode(_ urlPath: String, parameters: [String: AnyObject]? = nil, headers: [String: String]? = nil, encoding: ParameterEncoding = URLEncoding.default, completion: @escaping (_ statusCode: Int, _ responseData: [String: AnyObject]?) -> Void) {

    // you can omit 'encoding:' if you'll set it to default since it will be default by default. \o/
    Alamofire.request(urlPath, method: .get, parameters: parameters, encoding: encoding, headers: headers).responseJSON { (response) in

        if response.result.isSuccess, let returnObject = response.result.value as? [String: AnyObject], let statusCode = response.response?.statusCode {
            // do something...

            completion(statusCode, returnObject)
        }
    }
}

使用回调单独处理状态码