Question

So I’m making a very basic Twitter app (it’s actually Presence 2 from the Stanford iPhone course that’s on iTunes), when I decided I wanted to see if my application was leaking. So I ran Leaks and it found one right off the bat. But when I look at the stack trace the leak appears to happen in the main function when I call UIApplicationMain.

The image below shows the stack trace from instruments and the corresponding code in xcode. Does anyone know how I can stop this leak and why it’s happening?

alt text http://img193.imageshack.us/img193/1237/picture2fnj.png

EDIT: Ok I’ve searched and searched and got to where the problem is, but I still don’t know what’s going on. I’ve included the source for the TableViewController I’m having problems with.

The leak happens when I set the cell.text to [names objectAtIndex:indexPath.row]. Whats interesting is that it’s NSIndexPath that appears to be leaking somehow. How should I be managing memory with the objectAtIndex method?

On an unrelated topic, is editing my question post the best way to reply? Or should I have posted my code in a comment?

@implementation PersonListTableViewController


- (id)initWithStyle:(UITableViewStyle)style 
{
    if (self = [super initWithStyle:style])
    {
    NSString *path = [[NSBundle mainBundle] pathForResource:@"TwitterUsers" ofType:@"plist"];  
    names = [[NSArray alloc] initWithContentsOfFile:path];
    }
    return self;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{   
    return 0;
    //return [names count];
}


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

    static NSString *CellIdentifier = @"Cell";

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

    cell.text = [names objectAtIndex:indexPath.row];

    return cell;
}

- (UITableViewCellAccessoryType)tableView:(UITableView *)table accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath
{
    return UITableViewCellAccessoryDisclosureIndicator;
}


- (void)dealloc {
    [names release];
    [super dealloc];
}


@end

Answer 1

Are you running the tools on the device or the simulator? I’ve found that memory issues can be different between the two.