title: viewDidDisappear for UIView
body: <p>I've added a sub view like this in the main view:</p>
  
  <pre><code>    BTLPXYPad *XYPad = [[BTLPXYPad alloc] initWithFrame: CGRectMake (30, 10, 280, 460)];
      [window addSubview:XYPad];
  </code></pre>
  
  <p>done all my bits that i need to and then removed it using this in the BTLPXYPad class:</p>
  
  <pre><code>    [self removeFromSuperview];
  </code></pre>
  
  <p>What I need is to perform a task once it has gone. I know that with a UIViewController type class I could use viewDidDissapear but I can't seem to find the same thing for a UIView Type. Can anyone help please?</p>