Question

我需要删除api中的一些项目。我使用AFNetworking 2.3.4版本来响应api请求。在这里我使用DELETE方法删除api项目，当我调用此api时，它成功删除项目，但它会抛出错误“Data is nil”。为什么它抛出这个错误我不确切知道。

以下是我的API删除方法代码：

//使用Arraylist

删除带有访问令牌的API

           +(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没有任何问题，您的代码的期望是什么？

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。您只是删除了资源。它不在那里。

请参阅此答案：HTTP status code for update and delete?

摘要：您应该期望并接受状态200，其中数据描述删除操作成功，或者状态204没有任何数据，因为已成功删除数据。（有些人也会接受202，这基本上意味着服务器正在说＆＃34;我听说过你，我将删除它＆＃34;）。

“数据为零”值来自删除ios中的api值

1 个答案: