Question

I’m having quite a bit of pain inserting and deleting UITableViewCells from the same UITableView!

I don’t normally post code, but I thought this was the best way of showing where I’m having the problem:

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- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {     return 5; }   - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {      if (iSelectedSection == section) return 5;     return 1; }   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {      //NSLog(@'drawing row:%d section:%d', [indexPath row], [indexPath section]);      static NSString *CellIdentifier = @'Cell';      UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];     if (cell == nil) {         cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];     }      if (iSelectedSection == [indexPath section]) {         cell.textColor = [UIColor redColor];     } else {         cell.textColor = [UIColor blackColor];     }          cell.text = [NSString stringWithFormat:@'Section: %d Row: %d', [indexPath section], [indexPath row]];      // Set up the cell     return cell; }   - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {     // Navigation logic -- create and push a new view controller      if ([indexPath row] == 0) {          NSMutableArray *rowsToRemove = [NSMutableArray array];         NSMutableArray *rowsToAdd = [NSMutableArray array];          for(int i=0; i<5; i++) {              //NSLog(@'Adding row:%d section:%d ', i, [indexPath section]);             //NSLog(@'Removing row:%d section:%d ', i, iSelectedSection);              [rowsToAdd addObject:[NSIndexPath indexPathForRow:i inSection:[indexPath section]]];             [rowsToRemove addObject:[NSIndexPath indexPathForRow:i inSection:iSelectedSection]];          }          iSelectedSection = [indexPath section];          [tableView beginUpdates];         [tableView deleteRowsAtIndexPaths:rowsToRemove withRowAnimation:YES];         [tableView insertRowsAtIndexPaths:rowsToAdd withRowAnimation:YES];         [tableView endUpdates];      } } 

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This code creates 5 sections, the 1st (indexed from 0) with 5 rows. When you select a section – it removes the rows from the section you had previously selected and adds rows to the section you just selected.

Pictorally, when I load up the app, I have something like this:

http://www.freeimagehosting.net/uploads/1b9f2d57e7.png http://www.freeimagehosting.net/uploads/1b9f2d57e7.png

Image here: http://www.freeimagehosting.net/uploads/1b9f2d57e7.png

After selecting a table row 0 of section 2, I then delete the rows of section 1 (which is selected by default) and add the rows of section 2. But I get this:

http://www.freeimagehosting.net/uploads/6d5d904e84.png http://www.freeimagehosting.net/uploads/6d5d904e84.png

Image here: http://www.freeimagehosting.net/uploads/6d5d904e84.png

…which isn’t what I expect to happen! It seems like the first row of section 2 somehow remains – even though it definitly gets deleted.

If I just do a [tableView reloadData], everything appears as normal… but I obviously forefit the nice animations.

I’d really appreciate it if someone could shine some light here! It’s driving me a little crazy!

Thanks again, Nick.

Answer 1

FYI: This bug seems to have been fixed completely with the 2.2 iPhone update. Thanks Apple! Nick.