Question

I have a UILabel whose text I change from time to time. When I change the text, however, it doesn’t erase the old text — it re-draws on top of the old text and accumulates.

The UILabel is inside a UITableViewCell.

Has anyone encountered this problem? How do you fix it?

Answer 1

This happen when u customize UITableViewCell by [cell addSubView:UILabel] method.

So let me explain it in some detail:

We use [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; method to get cell to use.

This method can one of two thing:

1. Return new object of UITableViewCell.
   OR
2. Return old object of UITableViewCell which is not right now on screen. (To improve performance)

If it is fresh than no problem but if it is not than the controls which we have added by
[view addSubView:view] method are already there and we add it again on same position like
stack of same controls.

We can solve it by two way:

1. code in such a way that add [UIView addSubView:UIView] only if it is fresh cell.

2. (I suggest this) Use subclass of UITableViewCell also call Custom UITableViewCell.

You will find many tutorial on this let me give u some:

Creating a Custom UITableViewCell

How To Design A Custom UITableViewCell From Scratch

If you are using storyboard than it is very easy:

Creating Table Views with Storyboards

Using Xcode Storyboards to Build Dynamic TableViews with Prototype Table View Cells

All the best…