UITableView Inactive Until Scroll iPhone

Posted by dubbeat on Stack Overflow See other posts from Stack Overflow or by dubbeat
Published on 2010-03-15T12:17:55Z Indexed on 2010/03/15 12:19 UTC
Read the original article Hit count: 292

HI,

I'm trying to find the cause of some annoying behaviour with my UITableView.

In each cell of my table (10 of them ) I asynchronously load an image. The problem is, is that if I don't touch the app at all the imageviews will permanently show a loading icon. However as soon as I scroll a cell off the screen and back on again the image shows straight away.

What could be causing this "stuck in the mud" behaviour? Is there a way to force whatever gets called when the list is scrolled to make the needed update happen?

#define ASYNC_IMAGE_TAG 9999
#define LABEL_TAG 8888

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    PromoListItem *promo = [promoList objectAtIndex:indexPath.row];

    static NSString *CellIdentifier = @"Cell";

    AsyncImageView *asyncImageView = nil;
    UILabel *label = nil;
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        CGRect frame;
        frame.origin.x = 0;
        frame.origin.y = 0;
        frame.size.width = 100;
        frame.size.height = 100;
        asyncImageView = [[[AsyncImageView alloc] initWithFrame:frame] autorelease];
        asyncImageView.tag = ASYNC_IMAGE_TAG;
        [cell.contentView addSubview:asyncImageView];
        frame.origin.x = 110;
        frame.size.width =100;
        label = [[[UILabel alloc] initWithFrame:frame] autorelease];
        label.tag = LABEL_TAG;
        [cell.contentView addSubview:label];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    } else {
        asyncImageView = (AsyncImageView *) [cell.contentView viewWithTag:ASYNC_IMAGE_TAG];
        label = (UILabel *) [cell.contentView viewWithTag:LABEL_TAG];
    }

    NSURL *url = [NSURL URLWithString:promo.imgurl];

    [asyncImageView loadImageFromURL:url];

    label.text = promo.artistname;

    return cell;
}

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