"Data is Nil" 中的值删除 ios 中的 api 值

Question

我需要删除 api 中的一些项目。我使用 AFNetworking 2.3.4 版本进行 api 请求、响应。在这里，我使用 DELETE 方法删除 api 项，当我调用此 api 时，它成功删除了项，但抛出错误 "Data is nil"。为什么它抛出这个错误我不完全知道。

这是我的 API 删除方法代码：

// 删除 API with Access Token using Arraylist

           +(void)DeleteDataFromApiWithAccessToken:(NSString *)url withParameters:(NSDictionary *)parameters accessTokenValue:(NSString *)tokenValue returnBlock:(arrayList)block
        {
               NSLog(@"loadDataFromApi withParameters :: url %@, params %@",url,parameters);


AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

AFJSONRequestSerializer *serializer = [AFJSONRequestSerializer serializer];

[serializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[serializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];

[serializer setValue:tokenValue forHTTPHeaderField:ACCESSTOKEN_HEADER_FIELD];
[serializer setValue:FF_API_HEADER_VALUE forHTTPHeaderField:FF_API_HEADER_FIELD];

//serializer.HTTPMethodsEncodingParametersInURI = [NSSet setWithObjects:@"GET", @"HEAD", nil];

manager.requestSerializer.timeoutInterval = 0.7;
manager.requestSerializer.cachePolicy = NSURLRequestReloadIgnoringLocalAndRemoteCacheData;

manager.requestSerializer = serializer;

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

// Check the Network Connection
if(![CommonClassApp checkForNetwork]) {
    [CommonClassApp customAlert:ERR_MSG_NETWORK_PROBLEM];
    if (block) block(NULL);
}else {
    [manager DELETE:url parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject)
    {
        NSLog(@"RESPONSE STATUS CODE: %ld", [responseObject statusCode]);
        if (responseObject != NULL)
        {
            NSError *error = nil;

            NSMutableArray *responseJsonData = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];

            NSLog(@"responseJsonData - %@",responseJsonData);
            if (block) block(responseJsonData);
        }else{
            [CommonClassApp customAlert:ERR_MSG_INVALID_RESPONSE];
            if (block) block(NULL);
        }

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {


        NSLog(@"failure ::: %ld",(long)[operation.response statusCode]);
        NSDictionary *responseJsonData = [NSJSONSerialization JSONObjectWithData:(NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] options:NSJSONReadingAllowFragments error:&error];
        if ([operation.response statusCode] == 401) {
            if (responseJsonData.count>0) {
                NSString *userError = [responseJsonData valueForKey:@"code"];
                [CommonClassApp customAlert:[ERROR_AUTH_ERROR valueForKey:userError]];
            }
        }
        else
        {
            NSString *userError = [responseJsonData valueForKey:@"message"];
            NSLog(@"Error Message: %@",userError);
            [CommonClassApp customAlert:userError];
        }

        if (block) block(NULL);
    }];

Answer 1

API没有错，错的是你对代码的期望。

您要求 API 删除资源。那么你期待什么样的回应呢？状态 200 和一些数据？当然不是。您刚刚删除了资源。它不在那里。

看到这个答案：

总结：您应该期待并接受状态 200 的数据描述删除操作成功，或状态 204 没有任何数据，作为已成功删除数据。（有些人也会接受 202，这基本上意味着服务器在说 "I heard you, I'm going to delete it"）。

"Data is Nil" 中的值删除 ios 中的 api 值

"Data is Nil" value from delete the api values in ios

objective-c

ios

afnetworking