防止循环引用__weak

__weak TTCountDownViewController *weakSelf = self;

    [LJMainPageTool DailyRecommend:param success:^(TTDailyRecommentResult *result){

        if (result.re == 1) {

            weakSelf.dailyProducts = result.list;

            weakSelf.recommendProducts = result.hotlist;

            weakSelf.countdowm = result.countdowm;

            [weakSelf.collectionView reloadData];

        } else {

            Log(@"error");

        }

    } failure:^(NSError *error){

        Log(@"error network ");

    }];