Question

I m fairly new to objective-C and implementing the concept of autocomplete feature for a UItextField.I can do it appropriately .but when I select a particular cell then that cell’s text should be displayed in UITextField and correspondingly tableView must be hidden.But Im unable to hide a UITableView after selecting a cell..Where I m going wrong?

- (void)searchAutocompleteEntriesWithSubstring:(NSString *)substring {


    NSURL *urlString= [NSString stringWithFormat:@"http://179.87.89.90/services/Service.svc/GetCities/?p=%@&k=%@",substring,txtId.text];     
    NSURL *jsonUrl =[NSURL URLWithString:urlString];
    NSString *jsonStr = [[NSString alloc] initWithContentsOfURL:jsonUrl];  
    parser = [[NSXMLParser alloc] initWithContentsOfURL:jsonUrl];
    currentHTMLElement=@"3";
    [parser setDelegate:self];
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    [parser parse];
    [parser release];
    NSLog(@"%@",arr2);



    if([arr2 count]!=0)
    {
        self.autocompleteUrls = [[NSMutableArray alloc] init];

        autocompleteTableView = [[UITableView alloc] initWithFrame:CGRectMake(88, 447, 200, 120) style:UITableViewStyleGrouped];
        autocompleteTableView.delegate = self;
        autocompleteTableView.dataSource = self;
        autocompleteTableView.scrollEnabled = YES;
        // autocompleteTableView.hidden = YES;  
        [self.view addSubview:autocompleteTableView];
        [autocompleteUrls removeAllObjects];
            for(int i=0;i<[arr2 count];i++)
            {
                NSString *curString = [[arr2 objectAtIndex:i] valueForKey:@"Name"];

                NSRange substringRange = [curString rangeOfString:substring];

                if (substringRange.location == 0) 
                    [autocompleteUrls addObject:curString];  

            }
      [autocompleteTableView reloadData];
    }
    else
    {
        autocompleteTableView.delegate=nil;
        autocompleteTableView.dataSource=nil;
        autocompleteTableView.hidden = YES;  

    }

}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {



    if( textField == txtcity)
    {
     autocompleteTableView.hidden = NO;
    NSString *substring = [NSString stringWithString:textField.text];
    substring = [substring stringByReplacingCharactersInRange:range withString:string];
    [self searchAutocompleteEntriesWithSubstring:substring];
    return YES;
    }
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger) section {
    return autocompleteUrls.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = nil;
    static NSString *AutoCompleteRowIdentifier = @"AutoCompleteRowIdentifier";
    cell = [tableView dequeueReusableCellWithIdentifier:AutoCompleteRowIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] 
                 initWithStyle:UITableViewCellStyleDefault reuseIdentifier:AutoCompleteRowIdentifier] autorelease];
    }

    cell.textLabel.text = [autocompleteUrls objectAtIndex:indexPath.row];
    cell.textLabel.font=[UIFont boldSystemFontOfSize:12];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
    txtcity.text = selectedCell.textLabel.text;
    [autocompleteUrls removeAllObjects];
    [self.autocompleteTableView setHidden:YES];    
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

        UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
        txtcity.text = selectedCell.textLabel.text;
        [autocompleteUrls removeAllObjects];
        autocompleteTableView.hidden=YES;

    }

How can I hide autocompleteTableView after selecting a row ?
Any help would be appreciated..

Answer 1

The issue is with the if condition, when the if is evaluated true then again the autocompleteTableView is again allocated and added to self.view. It’ll be placed over the previous tableView and youare losing the reference of previous tableView. If you call autocompleteTableView.hidden = YES. Last added tableView will be hidden. But previously added tableViews will be there.

Just change the if block like:

if([arr2 count]!=0)
{
    self.autocompleteUrls = [[NSMutableArray alloc] init];
    if(autocompleteTableView)
         [autocompleteTableView removeFromSuperView];
    autocompleteTableView = [[UITableView alloc] initWithFrame:CGRectMake(88, 447, 200, 120) style:UITableViewStyleGrouped];
    autocompleteTableView.delegate = self;
    autocompleteTableView.dataSource = self;
    autocompleteTableView.scrollEnabled = YES;
    // autocompleteTableView.hidden = YES;  
    [self.view addSubview:autocompleteTableView];
        for(int i=0;i<[arr2 count];i++)
        {
            NSString *curString = [[arr2 objectAtIndex:i] valueForKey:@"Name"];

            NSRange substringRange = [curString rangeOfString:substring];

            if (substringRange.location == 0) 
                [autocompleteUrls addObject:curString];  

        }
  [autocompleteTableView reloadData];
}