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PO
 

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    <p>First, look at this statement in your code:</p> <pre><code>UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:@"itemCell"]; </code></pre> <p>The method <code>-dequeueReusableCellWithIdentifier</code> will either pull an already created table view cell, or generate a new one if no reusable cell is available.</p> <p>Now review this statement:</p> <pre><code>checkbox = [[UIButton alloc] initWithFrame:(CGRectMake(x,y,20,20))]; … [cell.contentView addSubview:checkbox]; </code></pre> <p>If your cell was just initialized, this code works fine. However, when you scroll your table, your code will start pulling old table view cells that were thrown into the reusable queue. Those old table view cells already contain a <code>UIButton</code>. So every time you call <code>-addSubview:</code> on an old cell, you add duplicate buttons.</p> <p>There are many ways to fix this. Here's one solution for you:</p> <pre><code>static NSInteger const checkboxTag = 123; checkbox = (UIButton *)[cell.contentView viewWithTag:checkboxTag]; if (!checkbox) { checkbox = [[UIButton alloc] initWithFrame:(CGRectMake(x,y,20,20))]; checkbox.tag = checkboxTag; [checkbox setBackgroundImage:[UIImage imageNamed:@"notSelectedButton.png"]forState:UIControlStateNormal]; [checkbox setBackgroundImage:[UIImage imageNamed:@"checkedButton.png"]forState:UIControlStateSelected]; [checkbox setBackgroundImage:[UIImage imageNamed:@"uncheckedButton.png"]forState:UIControlStateHighlighted]; checkbox.adjustsImageWhenHighlighted = YES; [checkbox addTarget:self action:@selector(checkboxSelected:) forControlEvents:UIControlEventTouchDown]; [cell.contentView addSubview:checkbox]; } </code></pre> <p><strong>EDIT:</strong></p> <p>Something else worth pointing out. This statement:</p> <pre><code>x =cell.frame.origin.x +100; y = cell.frame.origin.y + 10; </code></pre> <p>By referencing <code>cell.frame</code>, you're creating a <code>UIButton</code> relative to the cell's position in the table view, not the cell itself. Set <code>x = 100; y = 10;</code> to make the offset relative to the the cell's bounds instead.</p>
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    1. COThanks! Works! I get a error at: UIButton *checkbox = [cell.contentView viewWithTag:checkboxTag]; "Incompatible pointer types initializing 'UIButton *' with an expression of type 'UIView'
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    2. CO@user2139652 I edited my answer. Cast the result of `-viewWithTag:` to a `UIButton`.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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