Question

这里是代码：我正在从背景上的核心数据下载图像并将其放在我的图像视图中。

static NSString *cellIdentifier = @"Pubs Cell";
PubsCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

Pub *current = [self.fetchController objectAtIndexPath:indexPath];

cell.name.text = current.name;
cell.description.text = current.descriptionText;
cell.description.backgroundColor = [UIColor clearColor];
cell.description.editable = NO;
dispatch_queue_t queue = dispatch_queue_create("image_queue", NULL);
dispatch_async(queue, ^{
    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",current.photo]]];
    dispatch_async(dispatch_get_main_queue(), ^{

        cell.pubImage.image = [UIImage imageWithData:data];
    });
});
cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"light1.jpg"]];

return cell;

任何想法如何解决？提前谢谢。

Answer 1

在启动异步加载任务之前，您需要将图像设置为nil：

// removing the old image from the reused tablecell
cell.pubImage.image = nil;

// load image asynchronously
dispatch_queue_t queue = dispatch_queue_create("image_queue", NULL);
dispatch_async(queue, ^{
    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",current.photo]]];
    dispatch_async(dispatch_get_main_queue(), ^{
        cell.pubImage.image = [UIImage imageWithData:data];
    });
});

这是因为加载图像需要一些时间，所以你会看到旧版本，因为tablecells在可用时会重复使用。

闪烁图像tableview重用bug看视频链接 - ＆gt; http：//www.youtube.com/watch？v = jwEsqjc9sNc＆amp; feature = youtu.be

1 个答案: