Data repeat in UITableView when scrolling

Question

I use bellow codes to show data on TableView but when scrolling, data repeat and other data lost.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tab         


        

Answer 1

You are setting the text of the label only when creating a new cell. However, during cell reuse, new cell is not created. Hence your code for setting/changing text is not working. You can use this modified code.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"CellIdentifier";

    UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    UILabel *FileNameLabel=nil;
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

        FileNameLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 100, 30)];
        FileNameLabel.tag = 1001;
        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];
    }
    if(!FileNameLabel)
        FileNameLabel = [cell.contentView viewWithTag:1001];
    FileNameLabel.text =[FileCompletedArray objectAtIndex:indexPath.row];

    return cell;
}

Alternatively you can use the default textLabel instead of creating and adding new label

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"CellIdentifier";

    UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    UILabel *FileNameLabel=nil;
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:16];
        cell.textLabel.font = [UIFont boldSystemFontOfSize:16];
        cell.textLabel.textColor = [UIColor blackColor];
    }
    cell.textLabel.text =[FileCompletedArray objectAtIndex:indexPath.row];

    return cell;
}