iOS RSS Feed通过NSMutableArray搜索

Question

我试图创建一个支持搜索RSS源的RSS应用程序。我的代码在Github上（链接：https://github.com/sammy0025/SST-Announcements）。我试图应用搜索功能的视图控制器是SSTAMasterViewController。

在调整并结合Ray Wenderlich的“如何制作简单的RSS阅读器教程”和“如何将搜索添加到表格视图”中的代码之后，每当我尝试键入搜索栏时，我都会遇到这样的错误：

2013-06-02 16:53:44.764 SBlog Feed[2940:c07] -[RSSEntry setTableViewStyle:]: unrecognized selector sent to instance 0x7571930
2013-06-02 16:53:44.765 SBlog Feed[2940:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[RSSEntry setTableViewStyle:]: unrecognized selector sent to instance 0x7571930'

我怀疑它可能与我的filterContentForSearchText方法有关：

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    [self.searchResults removeAllObjects];
    NSPredicate *resultPredicate = [NSPredicate
                                predicateWithFormat:@"SELF.articleTitle contains[c] %@",
                                searchText];

    searchResults = [NSMutableArray arrayWithArray:[_allEntries filteredArrayUsingPredicate:resultPredicate]];
}

或我的cellForRowAtIndexPath方法：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell"; //Declare Cell Indent
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];

     if (cell==nil) {
         cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }
    RSSEntry *entry = [_allEntries objectAtIndex:indexPath.row]; //Makes individual entities for the entry

    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    NSString *articleDateString = [dateFormatter stringFromDate:entry.articleDate];
    cell.textLabel.text = entry.articleTitle;
    cell.detailTextLabel.text = [NSString stringWithFormat:@"%@", articleDateString];

    if (tableView==self.searchDisplayController.searchResultsTableView)
    {
        cell=[searchResults objectAtIndex:indexPath.row];
    }
    else
    {
        cell.textLabel.text=entry.articleTitle;
        cell.detailTextLabel.text=[NSString stringWithFormat:@"%@",articleDateString];
    }

    return cell;
}

尽管如此，我强烈怀疑这些代码：

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    [self filterContentForSearchText:searchString scope:
    [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
     return YES;
}

和if if（tableView == self.searchDisplayController.searchResultsTableView）

cell=[searchResults objectAtIndex:indexPath.row];

我的主要问题是如何在这种情况下实际允许在互联网上挂钩的Mutable Array中进行搜索？