iOS 多网络请求同步并发

    dispatch_group_t group = dispatch_group_create();

//    发起网络请求1
    dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        dispatch_semaphore_t  sema = dispatch_semaphore_create(0);
        [HttpRequestUtil GET:Action_Home_Adv parameters:@{@"spaceId":@"1"} finished:^(AjaxResult *result) {
            if (result.code == AjaxResultStateSuccess) {
                NSArray* advArray = result.datas;
                for (NSDictionary* diction in advArray) {
                    HXQADVModel* advModel = [HXQADVModel mj_objectWithKeyValues:diction];
                    [tempAdvList addObject:advModel];
                }
            }
            
            dispatch_semaphore_signal(sema);
        }];
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
    });

    //发起网络请求2
    dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        dispatch_semaphore_t  sema = dispatch_semaphore_create(0);
        [HttpRequestUtil GET:Action_Channel_list parameters:@{@"page":@"0",@"count":@"4"} finished:^(AjaxResult *result) {
            if (result.code == AjaxResultStateSuccess) {
                [wSelf.channelList removeAllObjects];
                [wSelf.channelList addObjectsFromArray:[HXQChannelModel mj_objectArrayWithKeyValuesArray:result.datas]];
            }
            dispatch_semaphore_signal(sema);
        }];
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
    });

    //发起网络请求3
    dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        dispatch_semaphore_t  sema = dispatch_semaphore_create(0);
        [HttpRequestUtil GET:Action_Project_RemdList parameters:nil finished:^(AjaxResult *result) {
            if (result.code == AjaxResultStateSuccess) {
                tempProjectList = [HXQProjectModel mj_objectArrayWithKeyValuesArray:result.datas];
            }
            dispatch_semaphore_signal(sema);
        }];
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
    });

    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    //所有网络请求都请求结束  这里处理多个请求回调数据并处理刷新显示

    });    dispatch_group_t group = dispatch_group_cre