using AssetsLibrary to read saved images album in iOS

ALAssetUsage.m

    void (^assetEnumerator)(ALAsset* result, NSUInteger index, BOOL*);
    void (^groupEnumerator)(ALAssetsGroup*, BOOL *);
    void (^faliure)(NSError*);
    
    groupEnumerator = ^(ALAssetsGroup *group, BOOL *stop){
        [group enumerateAssetsUsingBlock:assetEnumerator];
    }; 

    
    assetEnumerator = ^(ALAsset *result, NSUInteger index, BOOL *stop){
        CGImageRef image = [result thumbnail];
        UIImageView *iv = [[UIImageView alloc] initWithImage:[UIImage imageWithCGImage:image]];
        CGRect frame = [iv frame];
        frame.origin.x = x;
        frame.origin.y = y;
        frame.size.width= 30;
        frame.size.height = 30;
        [iv setFrame:frame];
        x = x + 40;
        if (x>320) {
            x=0;
            y += 40;
        }

        //add to whatever view you are in
        [self.window addSubview:iv];
    };
    
    faliure = ^(NSError *error){ NSLog(@"Failed"); };


    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    
    [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos 
                           usingBlock:groupEnumerator
                         failureBlock:faliure];