UITableview sections overwrite in iPhone? - iphone

Question

I have one problem with two sections in UITableview grouped style. First section having 6 rows and second section having 3 rows. When i scroll the tableview up and down the last row content of section 2 is adding in first section first row and the first row content in first section is adding in last row of second section. I check my level best whether the cell become empty to load the content but, it is not happening while debugging. My code is ,
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.backgroundColor = [UIColor whiteColor];
if (indexPath.section == 0 && indexPath.row == 0)
{
UILabel *Nameabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 140, 30)];
Nameabel.text = #"Name";
Nameabel.font = [UIFont fontWithName:#"Helvetica" size:15];
Nameabel.backgroundColor = [UIColor clearColor];
Nameabel.font = [UIFont boldSystemFontOfSize:15];
[cell.contentView addSubview:Nameabel];
textField = [[UITextField alloc] initWithFrame:CGRectMake(145, 5, 150, 30)];
textField.placeholder = #"Student Name";
textField.borderStyle = UITextBorderStyleNone;
textField.font = [UIFont fontWithName:#"Helvetica" size:14];
[cell.contentView addSubview:paymentCatTextField];
}
else if (indexPath.section == 1 && indexPath.row == 0)
{
UILabel *RLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 140, 30)];
RLabel.text = #"Class";
RLabel.backgroundColor = [UIColor clearColor];
RLabel.font = [UIFont fontWithName:#"Helvetica" size:15];
RLabel.font = [UIFont boldSystemFontOfSize:15];
[cell.contentView RLabel];
RTextField = [[UITextField alloc] initWithFrame:CGRectMake(145, 5, 150, 30)];
RTextField.placeholder = #"class Name";
RTextField.borderStyle = UITextBorderStyleNone;
RTextField.keyboardType = UIKeyboardTypeNumbersAndPunctuation;
RTextField.font = [UIFont fontWithName:#"Helvetica" size:14];
[cell.contentView addSubview:RTextField];
}
}
return cell;
}
This is for sample. By this way the section 0 have 6 rows and section 1 have 3 rows. Where i am doing wrong. Please help my to solve this problem.
Thanks in advance.

Answer 1

Change your code to the following and try again:
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.backgroundColor = [UIColor whiteColor];
}
if (indexPath.section == 0 && indexPath.row == 0) {
//bla bla
} else if (indexPath.section == 1 && indexPath.row == 0) {
//bla bla
}
return cell;
}
The reason is that you are setting the cell content only when you are not reusing the cell. That's wrong in most cases.

Answer 2

In addition to dasdom's answer I would also suggest removing the subviews before adding the labels.
if ([[cell.contentView subviews] count] > 0) {
UIView *labelToClear = [[cell.contentView subviews] objectAtIndex:0];
[labelToClear removeFromSuperview];
UIView *textToClear = [[cell.contentView subviews] objectAtIndex:1];
[textToClear removeFromSuperview];
}
and autoreleasing the subviews:
UILabel *Nameabel = [[[UILabel alloc] initWithFrame:CGRectMake(5, 5, 140, 30)] autorelease];
UITextField *textField = [[[UITextField alloc] initWithFrame:CGRectMake(145, 5, 150, 30)] autorelease];