iOS - display image from `ALAssetLibrary` - ios

Question

I have ViewController1 and ViewController2.
ViewController1 is UICollectionView and it use ASAssetLibrary to load thumbnail into UICollectionViewCell:
NSMutableArray *collector = [[NSMutableArray alloc] initWithCapacity:0];
ALAssetsLibrary *al = [TemplateEditBarController defaultAssetsLibrary];
[al enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
[group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
{
if (asset) {
[collector addObject:asset];
}
}];
assetsarray = collector;//<--assetsarray is local.
}
failureBlock:^(NSError *error) { NSLog(#"fail!");}
];
When cell selected, I want to pass either NSString or NSURL to ViewController2 so that it will call and display the full resolution image. But when NSLog the url:
ALAsset* asset = backgroundsarray[row];
ALAssetRepresentation *representation = [asset defaultRepresentation];
NSURL *url = [representation url];
newbg = [url absoluteString];//<-NSLog this.
I get:
assets-library://asset/asset.JPG?id=6E5438ED-9A8C-4ED0-9DEA-AB2D8F8A9360&ext=JPG
I tried change to [url path] I get:
asset.JPG
How can I get the actual photo url so that I can convert to NSString to pass to ViewController2?

Answer 1

NSURL* aURL = [NSURL URLWithString:imagePath];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:aURL resultBlock:^(ALAsset *asset)
{
UIImage *image = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage] scale:0.5 orientation:UIImageOrientationUp];
imageView.image=image;
}
failureBlock:^(NSError *error)
{
// error handling
NSLog(#"failure-----");
}];

Answer 2

My solution here:
ALAssetsLibrary *assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
if (asset) {
image = [UIImage imageWithCGImage:[asset aspectRatioThumbnail]];
}
}

Answer 3

Apparently there isn't any direct solution other than passing ALAsset. This is what I do:
In ViewController1, which is UICollectionViewController, I have this function:
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
//NSLog(#"selected row: %ld",(long)indexPath.row);
long row = [indexPath row];
NSString* newbg = [[NSString alloc]init];
if ([bartype isEqualToString:#"photolibrary"]) {
ALAsset* asset = backgroundsarray[row];
[_delegate changeBackgroundWithAsset:asset];
}
Then I have a function in ViewController2 to process ALAsset:
-(void)changeBackgroundWithAsset:(ALAsset*)b{
ALAssetRepresentation *rep = [b defaultRepresentation];
CGImageRef iref = [rep fullResolutionImage];
UIImage *bimage;
bimage = [UIImage imageWithCGImage:iref];
UIImageView* bgview = [[UIImageView alloc]init];
bgview = curbgview;
bgview.image = bimage;
}