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POInserting and deleting UITableViewCell at the same time not working
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copied!<p>I'm having quite a bit of pain inserting and deleting UITableViewCells from the same UITableView!</p> <p>I don't normally post code, but I thought this was the best way of showing where I'm having the problem:</p> <hr> <pre><code>- (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]; } } </code></pre> <hr> <p>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.</p> <p>Pictorally, when I load up the app, I have something like this:</p> <p><a href="http://www.freeimagehosting.net/uploads/1b9f2d57e7.png" rel="noreferrer">http://www.freeimagehosting.net/uploads/1b9f2d57e7.png http://www.freeimagehosting.net/uploads/1b9f2d57e7.png</a></p> <p>Image here: <a href="http://www.freeimagehosting.net/uploads/1b9f2d57e7.png" rel="noreferrer">http://www.freeimagehosting.net/uploads/1b9f2d57e7.png</a></p> <p>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:</p> <p><a href="http://www.freeimagehosting.net/uploads/6d5d904e84.png" rel="noreferrer">http://www.freeimagehosting.net/uploads/6d5d904e84.png http://www.freeimagehosting.net/uploads/6d5d904e84.png</a></p> <p>Image here: <a href="http://www.freeimagehosting.net/uploads/6d5d904e84.png" rel="noreferrer">http://www.freeimagehosting.net/uploads/6d5d904e84.png</a></p> <p>...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.</p> <p>If I just do a [tableView reloadData], everything appears as normal... but I obviously forefit the nice animations.</p> <p>I'd really appreciate it if someone could shine some light here! It's driving me a little crazy!</p> <p>Thanks again, Nick.</p>

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