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POiOS: UITableViewCell reuse, image of button changing
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  1. POiOS: UITableViewCell reuse, image of button changing
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    copied!<p>I know this has been widely discussed before, and I'm sure, I'm just missing something simply, but like many others before me, I have an issue with cell reuse in a UITableView... I have a button that displays an avatar, and I asynchronously download it the first time, and then cache it for later use... When I scroll in my tableview while the images are being downloaded the first time, the avatars appear wrongfully in cells being reused, despite that I'm setting the avatar to a default avatar before beginning a download, so I'm hoping someone here will know the solution...</p> <p>In cellForRowAtIndexPath:</p> <pre><code>WaitingCell *waitingCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifierWaiting]; if (waitingCell == nil) { waitingCell = [[WaitingCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifierWaiting]; waitingCell.delegate = self; } [waitingCell.userButton setImage:[UIImage imageNamed:DefaultAvatar] forState:UIControlStateNormal]; [waitingCell.usernameLabel setText:username]; [waitingCell.scoreLabel setText:score]; __block UIImage *img; dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_async(queue, ^{ if([p1.objectId isEqualToString:currentUser.objectId]) { img = [profileImages getProfileImageForUser:[p2 objectId]]; waitingCell.user = p2; } else { img = [profileImages getProfileImageForUser:[p1 objectId]]; waitingCell.user = p1; } dispatch_async(dispatch_get_main_queue(), ^{ [waitingCell.userButton setImage:img forState:UIControlStateNormal]; }); return waitingCell; </code></pre> <p>The image of "userButton" is the part that's getting reused until image is fully cached, but I thought that by setting it to a default value (DefaultAvatar is a constant file name), it would simply set the default avatar until the other was downloaded and it therefore wouldn't reuse other images..</p> <p>The button is defined in my custom UITableViewCell called WaitingCell as such:</p> <pre><code> self.userButton = [UIButton buttonWithType:UIButtonTypeCustom]; [self.userButton setImage:[UIImage imageNamed:PlaceholderAvatar] forState:UIControlStateNormal]; self.userButton.frame = CGRectMake(20, 8, 51, 54); [self.contentView addSubview:self.userButton]; </code></pre> <p>Any ideas how I can keep it from reusing images and simply use the DefaultAvatar until the correct image is downloaded?</p>
 

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