save image to local album

UIImageWriteToSavedPhotosAlbum.m

- (void)saveImageToAlbum
{
	UIImage *image = currentPage.imageView.image;
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    if (error == nil)
        NSLog(@"This picture has been saved to your photo album.", @"Picture Saved");
    else
        NSLog(@"Please try it again later.", @"Saving Failed");
}