ios - Alamofire 的错误序列化程序

Question

我正在尝试为 Alamofire 编写通用序列化程序，并且试图了解如何使通用响应序列化程序确定是否存在错误并返回自定义错误对象（在这种情况下，服务器返回错误字典）。

任何输入将不胜感激！

这是我目前正在使用的示例代码：

@objc public protocol ResponseObjectSerializable {
    init?(response: NSHTTPURLResponse, representation: AnyObject)
}

extension Alamofire.Request {
    public func responseObject<T: ResponseObjectSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, T?, NSError?) -> Void) -> Self {
        let serializer: Serializer = { (request, response, data) in
            let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
            let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
            if response != nil && JSON != nil {
                        return (T(response: response!, representation: JSON!), nil)
                    } else {
                        return (nil, serializationError)
                    }
                }

        return response(serializer: serializer, completionHandler: { (request, response, object, error) in
            completionHandler(request, response, object, error)
        })
    }
}