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POHow to properly reuse a cell in UITableView
 

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  1. POHow to properly reuse a cell in UITableView
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    <p>I'm a newbie. I am using this code to create a <code>UITableViewCell</code> but when I reload the table the button's image is not always correct, although all labels work fine. I don't know why. How can I fix this issue?</p> <pre><code>- (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]; UILabel *FileNameLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 100, 30)]; FileNameLabel.tag = 1000; FileNameLabel.backgroundColor = [UIColor clearColor]; FileNameLabel.font = [UIFont fontWithName:@"Helvetica" size:16]; FileNameLabel.font = [UIFont boldSystemFontOfSize:16]; FileNameLabel.textColor = [UIColor blackColor]; [cell.contentView addSubview: FileNameLabel]; [FileNameLabel release]; UILabel *UploadTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 20, 150, 25)]; UploadTimeLabel.tag = 2000; UploadTimeLabel.backgroundColor = [UIColor clearColor]; UploadTimeLabel.font = [UIFont fontWithName:@"Helvetica" size:12]; UploadTimeLabel.textColor = [UIColor grayColor]; [cell.contentView addSubview: UploadTimeLabel]; [UploadTimeLabel release]; UILabel *pricelabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 0, 80, 30)]; pricelabel.backgroundColor = [UIColor clearColor]; pricelabel.font = [UIFont fontWithName:@"Helvetica" size:16]; pricelabel.font = [UIFont boldSystemFontOfSize:16]; pricelabel.textColor = [UIColor darkGrayColor]; pricelabel.tag = 3000; //pricelabel.hidden = YES; pricelabel.textAlignment = NSTextAlignmentRight; [cell.contentView addSubview: pricelabel]; [pricelabel release]; market = [[UIButton alloc] init];; [market setFrame:CGRectMake(200, 6, 30, 30)]; market.tag = 4000; [market addTarget:self action:@selector(marketPressedAction:) forControlEvents:UIControlEventTouchDown]; [cell.contentView addSubview:market]; } if( [temp count] &gt; 0) { UILabel *fileNameLbl = (UILabel*)[cell.contentView viewWithTag:1000]; fileNameLbl.text =[temp objectAtIndex:indexPath.row]; UILabel *uploadlbl = (UILabel*)[cell.contentView viewWithTag:2000]; uploadlbl.text =[UploadTimeAllArr objectAtIndex:indexPath.row]; } UIButton *marketButton = (UIButton*)[cell.contentView viewWithTag:4000]; [marketButton setTag:indexPath.row]; if([sellingArray count]&gt;0) { NSLog(@"sellingArray %@",sellingArray); if([[sellingArray objectAtIndex:indexPath.row] isEqualToString:@"0"]) // nothing { [marketButton setSelected:NO]; [marketButton setImage:[UIImage imageNamed:@"Marketplace.png"] forState:UIControlStateNormal]; marketButton.enabled = YES; } else if([[sellingArray objectAtIndex:indexPath.row] isEqualToString:@"2"]) // marketplace { [marketButton setSelected:YES]; [marketButton setImage:[UIImage imageNamed:@"MarketplaceSelect.png"] forState:UIControlStateNormal]; marketButton.enabled = YES; } } return cell; } </code></pre>
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    1. COYou have an extra line in your UIButton code. You are loading two instances. THe first instance with `alloc - init`. The second with `buttonWithType:UIButtonTypeCustom`. I don't know what happens under arc in this situation but I believe that it used to be called a dangling pointer.
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      1. USJustin
 

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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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