#pragma mark - UISearchBarDelegate
//当搜索文本被改变的时候调用- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
　　//改变searchController中tableView的位置    _searchController.searchResultsTableView.frame = CGRectMake(kZero, _tableViewY, kScreenW, kScreenH - _tableViewY);        [[RealtimeSearchUtil currentUtil] realtimeSearchWithSource:self.dataSource searchText:(NSString *)searchText collationStringSelector:@selector(chatter) resultBlock:^(NSArray *results) {        if (results) {            dispatch_async(dispatch_get_main_queue(), ^{                [self.searchController.resultsSource removeAllObjects];                [self.searchController.resultsSource addObjectsFromArray:results];                [self.searchController.searchResultsTableView reloadData];            });        }    }];}