sample functions calls to get the images from the iPhone image library

UseAssetsLibrary

#import <AssetsLibrary/AssetsLibrary.h>

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop)
    {
        if( result != nil)
        {
            [_assets addObject:result];
        }
    };
    
    void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop)
    {
        if( group != nil)
        {
            [group enumerateAssetsUsingBlock:assetEnumerator];
        }
    };
    
    
    _assets = [[NSMutableArray alloc] init];
    ALAssetsLibrary *library = [CustomCameraViewController defaultAssetsLibrary];
    [library enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:assetGroupEnumerator failureBlock:^(NSError *error) {
        NSLog(@"Problem!");
    }];    
}

+ (ALAssetsLibrary *)defaultAssetsLibrary {
    static dispatch_once_t pred = 0;
    static ALAssetsLibrary *library = nil;
    dispatch_once(&pred, ^{
        library = [[ALAssetsLibrary alloc] init];
    });
    return library;
}