使用UISearchDisplayController时显示搜索结果崩溃

Question

I tried to implement a SearchBarView Controller to my TableView with CoreData. But, when I tap on the Searchbar, the app crashes and I get the following Error:

Assertion failure in -[UISearchResultsTableView dequeueReusableCellWithIdentifier:forIndexPath:], /SourceCache/UIKit/UIKit-2935.137/UITableView.m:5439
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to dequeue a cell with identifier Cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

Without Searchbar I show my TableContent like this:

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

    // Configure the cell...
    NSManagedObject *device = [self.inventory objectAtIndex:indexPath.row];
    [cell.textLabel setText:[NSString stringWithFormat:@"%@", [device valueForKey:@"productName"]]];
    //[cell.detailTextLabel setText:[device valueForKey:@"company"]];

    return cell;
}

works perfectly.

So now I tried to show the SearchbarViewControllerContent like this:

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

    // Configure the cell...
    NSManagedObject *device = nil;
    if (tableView == self.searchDisplayController.searchResultsTableView)
        {device = [searchResults objectAtIndex:indexPath.row];}
    else
        {device = [self.cart objectAtIndex:indexPath.row]; }

    [cell.textLabel setText:[NSString stringWithFormat:@"%@", [device valueForKey:@"productName"]]];

    return cell;
}

but this doesn't work.

If you have to know how my Searchbar (should) works:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 71;
}

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"productName contains[c] %@", searchText];
    searchResults = [cartProducts filteredArrayUsingPredicate:resultPredicate];
}

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

    return YES;
}

Answer 1

您必须在viewDidLoad方法中注册搜索tableView的单元格，例如：

  [self.searchDisplayController.searchResultsTableView registerNib:[UINib nibWithNibName:<Nib Name> bundle:nil] forCellReuseIdentifier:<cellIdentifier>]