mono touch中可以在Dispose方法内做一些内存释放

protected override void Dispose (bool disposing){base.Dispose (disposing);// Release imagesfirstImage.Dispose ();secondImage.Dispose ();thirdImage.Dispose ();// Release labelstouchInfoLabel.Dispose ();touchPhaseLabel.Dispose ();touchInstructionLabel.Dispose ();touchTrackingLabel.Dispose ();}