iOS AFNetworking用JSON类型数据发送POST请

以前给后端传参数都是post form(NSDictionary)方式,今天后端要求我用post json方式,开始直接懵逼状态,这也没用过啊,找了好多的资料,最后在AFN里面找到了AFJSONRequestSerializer,代码如下

    NSDictionary*dict =@{

        @"value":@(self.tempareValues),

        @"timepoint":self.currentTime,

        @"deviceCode":m_deviceCode,

        @"iValue":@(self.ivalueNum)

    };   

        AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

        NSMutableURLRequest *request = [[AFJSONRequestSerializer serializer] requestWithMethod:@"POST" URLString:url parameters:self.saveJsonArray error:nil];

        request.timeoutInterval=10.f;

        [requestsetValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

        [requestsetValue:@"application/json" forHTTPHeaderField:@"Accept"];

        [requestsetValue:YYUserToken forHTTPHeaderField:@"Authorization"];

        dispatch_time_tdelayTime =dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0/*延迟执行时间*/* NSEC_PER_SEC));

        NSURLSessionDataTask*task = [managerdataTaskWithRequest:requestcompletionHandler:^(NSURLResponse*_Nonnullresponse,id  _NullableresponseObject,NSError*_Nullableerror) {

            if(!error) {

            

            }else{

                NSLog(@"请求失败error=%@", error);

            }

        }];

        [taskresume];