下载图像后重新加载CollectionView的单元格

Question

I'm using the library SDWebImage to download the images.

I set the image downloaded to the UICollectionViewCell inside cellForItemAtIndexPath but the image is visible just after scrolling the CollectionView. I think that I must reload that specific cell but no idea how.

Here is the code of UICollectionViewCell

[imgView setImageWithURL:[NSURL URLWithString:imgUrl]
                               placeholderImage:[UIImage imageNamed:@"YourPlaceholder.png"]
                                      completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
                                          //... completion code here ...
                                          cell.image = imgView.image;
                                          //Reload The cell to see the image downloaded ¿HOW?
                                      }];

code of MJCollectionViewCell.m

- (void)setImage:(UIImage *)image
{
    // Store image
    self.MJImageView.image = image;

    // Update padding
    [self setImageOffset:self.imageOffset];
}

Any idea how to solve it?

Answer 1

I encountered this same problem.

The solution: [cell setNeedsLayout];

Answer 2

have you tried doing something like this?

dispatch_async(dispatch_get_main_queue(), ^{
    cell.image = imgView.image;
});

or reloading using - (void)reloadItemsAtIndexPaths:(NSArray *)indexPaths like

[collectionView reloadItemsAtIndexPaths:YourIndexPath];

Answer 3

You have to upgrade SDWebImage, your version doesn't work with iOS8. Download the last library of SDWebImage and use sd_setImageWithURL method instead.