dispatch_group_enter(group) 和dispathc_group_leave(group) 成对出现

     _group = dispatch_group_create();
    dispatch_queue_t queue = dispatch_get_main_queue();
    dispatch_group_enter(_group);
    [self getHomeLunboData:^{
        dispatch_group_leave(self->_group);
    }];
    dispatch_group_enter(_group);
    [self getHomeActivitysData:^{
        dispatch_group_leave(self->_group);
    }];
    dispatch_group_notify(_group, queue, ^{
        DGLog(@"处理headerview");
        float he = ((DGSCREEN_WIDTH - Set_WidthScale(30.)) * 129 / 345);
        [self.headerView configPics:self.lunboArrary notices:self.noticeListModelArray];
        if (kArrayIsEmpty(self.lunboArrary)) {
            if (kArrayIsEmpty(self.noticeListModelArray)) {
                self.headerView.frame = CGRectMake(0, 0, self.view.width, he + 15 + [DGIconView getIconVH] + 10);
                self.tableView.tableHeaderView = self.headerView;
            }else{
                [self.tableView.tableHeaderView changeHeight: 15 + [DGIconView getIconVH] + 10 + 48 + 10];
                self.tableView.tableHeaderView = self.headerView;

            }
        }else{
            if (kArrayIsEmpty(self.noticeListModelArray)) {
                [self.headerView changeHeight:he + 15 + [DGIconView getIconVH] + 10];
                self.tableView.tableHeaderView = self.headerView;
            }else{
                [self.headerView changeHeight:he + 15 + [DGIconView getIconVH] + 10 + 48 + 10];
                self.tableView.tableHeaderView = self.headerView;
            }
        }
    });

- (void)getHomeLunboData:(void(^)(void))returnBlock{
    [[RequestAPIClient APIClientInstance] sendRequestPath:kGetLunbo params:@{} method:Post_Method success:^(id  _Nonnull responseObject) {
        if (200 == [responseObject[@"code"] integerValue]) {
            [self.tableView.mj_header endRefreshing];
            self.lunboArrary = [HZLunboModel mj_objectArrayWithKeyValuesArray:responseObject[@"data"]];
        }
        returnBlock();
    } failure:^(id  _Nonnull responseObject) {
        DGLog(@"%@", responseObject);
        returnBlock();
    }];

}
- (void)getHomeActivitysData:(void(^)(void))returnBlock{
    [[RequestAPIClient APIClientInstance] sendRequestPath:kGetNotices params:@{} method:Post_Method success:^(id  _Nonnull responseObject) {
        if (200 == [responseObject[@"code"] integerValue]) {
            [self.tableView.mj_header endRefreshing];
            self.noticeListModelArray = [DGHomeNoticeModel mj_objectArrayWithKeyValuesArray:responseObject[@"data"]];
        }
        returnBlock();
    } failure:^(id  _Nonnull responseObject) {
        returnBlock();
    }];

}