ios:在 Collection View 单元格中重叠图像

Question

我以编程方式创建了 Collection View ，其中我以编程方式在 collectionViewCell 中创建了 UIImageview，并且 ImageView 中显示的图像是从服务器异步下载的。

下面的代码写在 cellForItemAtIndexPath: 方法中 -

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
    NSURL *imageURL = [NSURL URLWithString:[arrmImgPaths objectAtIndex:indexPath.row]];
    NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
    UIImage *image = [UIImage imageWithData:imageData];

   // [imgvMainView removeFromSuperview];
    // Now the image will have been loaded and decoded and is ready to rock for the main thread
    dispatch_sync(dispatch_get_main_queue(), ^{

        imgvMainView =[[UIImageView alloc] initWithFrame:CGRectMake(34,41,177,124)];
        [cell addSubview:imgvMainView];

        [imgvMainView setImage:image];
        imgvMainView.contentMode = UIViewContentModeScaleAspectFit;

    });
});

问题是，当我滚动收藏 View 时，一些图像彼此重叠。请告诉我避免它的解决方案。提前致谢。

Answer 1

请使用下面一行，我希望这能解决我假设的重复单元格问题。

UIImageView* imgvMainView =[[UIImageView alloc] initWithFrame:CGRectMake(34,41,177,124)];[cell.contentView addSubview:imgvMainView];