Alamofire无法在当前上下文中推断闭包类型

Question

我正在为DataRequest创建扩展以记录事件

func log() -> Self {
        let responseSerializer = DataRequest.jsonResponseSerializer(options: .allowFragments)
        return response(queue: nil, responseSerializer: responseSerializer) { response in
            if let object = response.result.value {
                /* do the job */
            }
        }
}

并得到错误Unable to infer closure type in the current context因为它具有(DataResponse<T.SerializedObject>) -> Void泛型类型，有没有办法显式设置该类型以解决此错误？

Alamofire版本： 4.7.2 Xcode版本： 9.3 Swift版本： 4.0 运行Alamofire的平台： iOS

Answer 1

func log() -> Self {
        let responseSerializer = DataRequest.jsonResponseSerializer()
        return response(responseSerializer: responseSerializer) { [weak self] response in
            guard let _self = self else { return }
            _self.printRequestString(response)
        }
    }

效果很好。