Group Table View - loading data

Looking for help on how to properly load the data for a Grouped Table View. I am using following code to load the data which I think should prepare an array "details" for "cellForRowAtIndexPath". However when I run the program I get the same data for all groups and it happens to be the last row in my data (which is in an NSArray called "Users"). Obviously I am doing something wrong but not sure what... please help.

// Customize the number of rows in the table view.

- (NSInteger)tableView:(UITableView *)ta开发者_运维技巧bleView numberOfRowsInSection:(NSInteger)section {

NSRange aRange;
aRange.length = 9; aRange.location = 16;
NSString *users = [self.Users objectAtIndex: section];
NSString *subtitle = [NSString stringWithString:[users substringWithRange:aRange]];
details = [[NSArray arrayWithObjects:subtitle, subtitle, subtitle, nil] retain];

return [details count];

}

The data loading routine is as follows:

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

static NSString *CellIdentifier = @"Cell";

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

// Configure the cell.
UIImage *cellImage = [UIImage imageNamed:@"world.png"];
cell.imageView.image = cellImage;
cell.textLabel.text = [details objectAtIndex:indexPath.row];
return cell;

}

From what you've posted, details array is being reset every time the table views asks its data sources for the number of rows in a section. details is last set when -tableView:numberOfRowsInSection: is last called i.e. for the last section. Once set, the same array provides the data for cell.textLabel.text for all the sections. So you are getting incorrect data.

It would be appropriate to calculate and store all the details arrays in a different array, say detailsArray.
The data can then be accessed them like
[[detailsArray objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]

Another problem with your code is that every time numberOfRowsInSection is called, data is being leaked as details is being reset without the earlier object being released.