Question

I have an app that uses a tableview, along with a UIButton that I add as a subview to each custom cell, like this:

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];

    checkButton = [[UIButton buttonWithType:UIButtonTypeCustom] initWithFrame:CGRectMake(2.0, 2.0, 40.0, 40.0)];
    [cell.contentView addSubview:checkButton];

    // lot's of other code

    return cell;
}

I thought all was fine until I started using Instruments to make sure I didn’t have any memory leaks, but I’ve found that adding the UIButton as a subview of the cell like that somehow causes a leak within UIKit.

Specifically, I get a memory leak for each cell row (for each time the button is added as a subview), and the leaked object is “CALayer” with the responsible frame being “-[UIView _createLayerWithFrame:]”.

Am I doing something wrong here?

Answer 1

The code [UIButton buttonWithType] method already includes an initWithFrame method. You need to just use a CGRectMake, and then set the frame of the button.

rectangle = CGRectMake(2.0f,2.0f,40.0f,40.0f);
checkButton = [UIButton buttonWithType:UIButtonTypeCustom];
checkButton.frame = rectangle;