tableView.emptyDataSetVisible always return NO

[EggmanQi]

It's a great library and it works fine in a few days ago.
But today when i test my APP and found that 'reloadEmptyDataSet' doesn't make anything happen.
Pod code is pod DZNEmptyDataSet

    _status = myStatus;
    _emptyDescription = description;    
    switch (_status) {
        case SSTableViewEmptyStatus_Loading:
            _statusImage = ImageNamed(@name);
            _displayStatus = NO;
            break;
        case SSTableViewEmptyStatus_NoData:
            _statusImage = ImageNamed(@name);
            _displayStatus = YES;
            break;
        case SSTableViewEmptyStatus_Reload:
            _statusImage = ImageNamed(@name);
            _buttonImage = ImageNamed(@name);
            _displayStatus = YES;
            break;
        default:
            // . other status
            break;
    }

    [self.tableView reloadEmptyDataSet];
    NSLog(@"%@", self.tableView.emptyDataSetSource); // return nonnull value
    NSLog(@"%@", self.tableView.emptyDataSetDelegate); // return nonnull value
    NSLog(@"%@", self.tableView.emptyDataSetVisible? @"yes" : @"no");  // just return "no"