Problem with UITable indexed view

[racharambola5]

Hi,

I am trying to grab the data from the database and display all the values in sorted order grouped into sections from A-Z and also my UITableView is indexed. In this case the indexes are A-Z. The strange thing that's happening is when I get all the values from the DB onto the table, I see that values under section 'B' has some values from section 'A' and if I tap on any index for example if I tap on index 'D' and come back to letter 'B' section the values that used to start with A are now replaced with D.

This happens only to section 'B' values in particular. All the values in other sections are displayed correctly. Sorry if the question is not clear. This is the best way I thought that I can describe my problem.

Please I need your help. It is very urgent to finish off this task and I can't understand why this is happening. I am a newbie in iphone development.

[Duncan C]

Originally Posted by racharambola5

Hi,

I am trying to grab the data from the database and display all the values in sorted order grouped into sections from A-Z and also my UITableView is indexed. In this case the indexes are A-Z. The strange thing that's happening is when I get all the values from the DB onto the table, I see that values under section 'B' has some values from section 'A' and if I tap on any index for example if I tap on index 'D' and come back to letter 'B' section the values that used to start with A are now replaced with D.

This happens only to section 'B' values in particular. All the values in other sections are displayed correctly. Sorry if the question is not clear. This is the best way I thought that I can describe my problem.

Please I need your help. It is very urgent to finish off this task and I can't understand why this is happening. I am a newbie in iphone development.

This kind of behavior usually means you aren't handling cell reuse correctly.

When you ask for a cell from the reuse queue, if you get a recycled cell, you have to fill out all the elements that you use. The cell will usually have values left over from the last time it was usd.

Post the code for your cellForRowAtIndexPath method, and we can take a look.

[racharambola5]

Thanks for the reply. Here is my code



- (UITableViewCell *)tableViewUITableView *)tableView cellForRowAtIndexPathNSIndexPath *)indexPath {

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];;
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}

if (isSearchOn) {
NSString *cellValue = [searchResult objectAtIndex:indexPath.row];
cell.textLabel.text = cellValue;
} else {
NSString *contact=[contactKeys objectAtIndex:[indexPath section]];
NSArray *contactSection=[contactNames objectForKey:contact];
if (indexPath.row != 0) {
if ( [[contactSection objectAtIndex:[indexPath row]] isEqualToString:[contactSection objectAtIndex:[indexPath row]-1]] )
{
return cell;
}
else
cell.textLabel.text=[contactSection objectAtIndex:[indexPath row]];
}
else
cell.textLabel.text=[contactSection objectAtIndex:[indexPath row]];
}

return cell;
}

[Duncan C]

Originally Posted by racharambola5

Thanks for the reply. Here is my code



- (UITableViewCell *)tableViewUITableView *)tableView cellForRowAtIndexPathNSIndexPath *)indexPath {

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];;
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}

if (isSearchOn) {
NSString *cellValue = [searchResult objectAtIndex:indexPath.row];
cell.textLabel.text = cellValue;
} else {
NSString *contact=[contactKeys objectAtIndex:[indexPath section]];
NSArray *contactSection=[contactNames objectForKey:contact];
if (indexPath.row != 0) {
if ( [[contactSection objectAtIndex:[indexPath row]] isEqualToString:[contactSection objectAtIndex:[indexPath row]-1]] )
{
cell.textLabel.text = @"";
return cell;
}
else
cell.textLabel.text=[contactSection objectAtIndex:[indexPath row]];
}
else
cell.textLabel.text=[contactSection objectAtIndex:[indexPath row]];
}

return cell;
}

If you look at the flow of your code, there is a case where you don't set cell.textLabel.text at all. I changed the code above, assuming that in that case the text label should be nil. The change is marked in bold.

[racharambola5]

Thanks Duncan for helping me out.. I will check with this and will let you know..

[racharambola5]

Duncan,

By implementing the way you told me I can see empty cell on the table row whenever the above case is validated. What should I pass to get the correct value??