ios - Swift 3 - 无法调用非函数类型的值 '(response: Any, error Any)'

Question

我在 Swift 3 中写了下面的方法

func postFormData(url : String, parameters: Parameters!, headers : HTTPHeaders!, completionHandler : (response : Any,  error: Any)) {

    Alamofire.request(url, method : .post, parameters: parameters, headers: headers)
        .responseJSON { response in

            if let status = response.response?.statusCode {
                switch(status)
                {
                    let data = result as! NSDictionary
                    case 200:
                        if let result = response.result.value {
                            completionHandler(data)
                        }
                    default:
                        completionHandler(nil, data)
                }
            }
    }

}

1. 我在 completionHandler(data) 处收到一个错误，指出 Cannot call value of non-function type '(response: Any, error Any)'
2. 编写 completionHandler(nil, data) 是处理错误的最佳实践吗？

PS:我是 iOS 和 Swift 3

的新手

Answer 1

您缺少 completionHandler -> Void 和参数名称的返回值，我在此处添加了默认值 _:

func postFormData(url : String, parameters: Parameters!, headers : HTTPHeaders!, completionHandler : (_ response : Any,  _ error: Any) -> Void ) {

    Alamofire.request(url, method : .post, parameters: parameters, headers: headers)
        .responseJSON { response in
            if let status = response.response?.statusCode {
                switch(status)
                {
                    let data = result as! NSDictionary
                case 200:
                    if let result = response.result.value {
                        completionHandler(data)
                    }
                default:
                    completionHandler(nil, data)
                }
            }
    }

}

对于错误部分，我会添加一个 onError 作为 , onError: (NSError) -> Void) 并在发生错误时返回 onError。所以像这样:

func postFormData(url : String, parameters: Parameters!, headers : HTTPHeaders!, completionHandler : (_ response : Any,  _ error: Any) -> Void, onError: (NSError) -> Void)