UISearchDisplayController / UISearchResultsTableView为每个搜索添加额外的行？ IOS 7

Question

我有一个UISearchDisplayController，它在iOS7下表现得很奇怪。我第一次进行搜索时，一切正常，UISearchResultsTableView正确显示结果。

问题是我第二次进行搜索（在解除表格后），空白行（看起来像一个单元格）被添加到搜索结果表的顶部：

然后，每个后续搜索都会在表格的顶部添加另一个空白行，依此类推。

以下是代码：

//Setup the search bar.
searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0.0f, 0.0f, 360.0f, 44.0f)];
UIBarButtonItem * searchBarButton = [[UIBarButtonItem alloc] initWithCustomView:searchBar];
searchBar.delegate = self;
controller = [[UISearchDisplayController alloc]initWithSearchBar:self.searchBar contentsController:self];
controller.searchResultsDataSource = self;
controller.searchResultsDelegate = self;

self.tabBarController.navigationItem.rightBarButtonItems = @[searchBarButton];

- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText {
    if (isLoading) {
        return;
    }

    [self filter : searchText];
    [controller.searchResultsTableView reloadData];

}

- (void)filter : (NSString *)text {
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(name CONTAINS[cd] %@ OR number CONTAINS[cd] %@)", text, text];
    searchResults  = [standArray filteredArrayUsingPredicate:predicate];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [searchResults count];
}

    -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyIdentifier"];

        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"MyIdentifier"];
            cell.selectionStyle = UITableViewCellSelectionStyleNone;
        }

        if ([searchResults count] ==0) {
            cell.textLabel.text = @"";
        }
        else {
            NSString * name = [[searchResults objectAtIndex:indexPath.row] name];
            NSString * number = [[searchResults objectAtIndex:indexPath.row] number];
            NSString * resultsString = [NSString stringWithFormat:@"%@ %@", name, number];
            cell.textLabel.text = resultsString;
        }

        return cell;

    }

    - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
        NSString * name = [[searchResults objectAtIndex:indexPath.row] name];
        Object * exhibitor = [self getExhibitorForStandName:standName];
        if ([exhibitor.companyName isEqualToString:standName]) {
            NSString * status = [[self getExhibitorForStandName:standName] status];
            cell.backgroundColor = [standColourMapping objectForKey:status];
        }
    }

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {
        [self.searchDisplayController setActive:NO animated:YES];

        ...
        }
    }

Answer 1

对于未来的旅行者来说，这看起来像一个奇怪的错误，UISearchBar的高度随后会出现在searchResultsTable的顶部。

解决方案如下：

controller.searchResultsTableView.contentInset = UIEdgeInsetsMake(0.0f, 0.f, 0.f, 0.f); //Fix for weird weird iOS7 bug where each subsequent
    //search adds the height of the searchBar to the top of the searchResultsTableView.