How to fetch album poster image using Photo Kit?

Question

When using Assets Library you could fetch the album's poster image from ALAssetsGroup. How do you achieve the same when using Photos Framework (Photo kit)?

Answer 1

It is a very simple thing...

    PHFetchOptions *userAlbumsOptions = [PHFetchOptions new];
    userAlbumsOptions.predicate = [NSPredicate predicateWithFormat:@"estimatedAssetCount > 0"];

    PHFetchResult *userAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:userAlbumsOptions];

    [userAlbums enumerateObjectsUsingBlock:^(PHAssetCollection *collection, NSUInteger idx, BOOL *stop) {
    NSLog(@"album title %@", collection.localizedTitle);
    PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
    PHAsset *asset = [assetsFetchResult objectAtIndex:0];
    NSInteger retinaMultiplier = [UIScreen mainScreen].scale;
    CGSize retinaSquare = CGSizeMake(80 * retinaMultiplier, 80 * retinaMultiplier);

    [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:asset.localIdentifier] options:SDWebImageProgressiveDownload targetLocalAssetSize:retinaSquare progress:^(NSInteger receivedSize, NSInteger expectedSize) {

    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
        if (image) {
            albumCoverImg.image = image;
        }
    }];
}];

and if you have not updated SDWebImage classed then load image as a normal way.