Save image to Camera Roll

gistfile1.m

UIImageWriteToSavedPhotosAlbum(_currentVC.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error
  contextInfo:(void *)contextInfo
{
    // Was there an error?
    if (error != NULL)
    {
		UIAlertView *alert = [[UIAlertView alloc] init];
        [alert setTitle: @"Error, try again"];
        [alert addButtonWithTitle: @"Next"];
        [alert show];
        return;
        // Show error message...
    }
    else  // No errors
    {
        UIAlertView *alert = [[UIAlertView alloc] init];
        [alert setTitle: @"Image saved"];
        [alert addButtonWithTitle: @"Next"];
        [alert show];
        return;
		// Show message image successfully saved
    }
}