AFN 用post方式发送json格式的数据

AFN 用post方式发送json格式的数据加上下边两句话就行了

session.requestSerializer = [AFJSONRequestSerializer serializer];
session.responseSerializer = [AFJSONResponseSerializer serializer];

/**
 *  post请求方法
 *
 *  @param urlString  网络请求url
 *  @param parameters 网络请求参数
 *  @param success    请求成功的回调
 *  @param failure    请求失败的回调
 */
+ (void)postWithURLString:(NSString *)urlString parameters:(NSMutableDictionary *)parameters success:(void (^)(id responseObject))success failure:(void (^)(NSError *error))failure
{
    AFHTTPSessionManager *session = [AFHTTPSessionManager manager];

    session.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/html", @"text/plain", nil];

    //post 发送json格式数据的时候加上这两句
    // >>>>>>>>
    session.requestSerializer = [AFJSONRequestSerializer serializer];
    session.responseSerializer = [AFJSONResponseSerializer serializer];
    // <<<<<<<<
    
    
    
    session.requestSerializer.timeoutInterval = 15;
    NSString *baseString = [NSString xxxx];
    
    [session POST:baseString parameters:parameters progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        if (success) {
            success(responseObject);
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        if (failure) {
            failure(error);
        }
    }];
}

也可以这样: 但是推荐第一种方式

/**
post 请求发送json数据

@param urlString url
@param parameters 参数的 字典形式
@param success 成功的调用
@param failure 失败的调用
*/
+ (void)postJsonWithURLString:(NSString *)urlString parameters:(NSMutableDictionary *)parameters success:(void (^)(id responseObject))success failure:(void (^)(NSError *error))failure {
    
    NSDictionary *body = parameters;
    
    NSError *error;
    
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:body options:0 error:&error];
    
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    
    
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    
    NSString *baseString = [NSString stringWithFormat:@"%@%@",REQ_HOST,urlString];
    
    NSMutableURLRequest *req = [[AFJSONRequestSerializer serializer] requestWithMethod:@"POST" URLString:baseString parameters:nil error:nil];
    
    req.timeoutInterval= [[[NSUserDefaults standardUserDefaults] valueForKey:@"timeoutInterval"] longValue];
    
    [req setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    
    [req setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    
    [req setHTTPBody:[jsonString dataUsingEncoding:NSUTF8StringEncoding]];
    
    [[manager dataTaskWithRequest:req completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        
        if (!error) {
            
            //NSLog(@"Reply JSON: %@", responseObject);

            success(responseObject);

        } else {
            
            //NSLog(@"Error: %@", error);
            failure(error);
            
        }
        
    }] resume];
    
}