title: UISlider returns two Touch Up Inside events, why does that happen?
body: <p>I have a slider that I'm using to set a float value somewhere. I connect <em>Value Changed</em> to  a method in my viewController. That part works fine.</p>
  
  <p>I need to know when the user starts touching the control but not necessarily every single instant that the slider changes (I receive the <em>Value Changed</em> events for that). So I connected a <em>Touch Up Inside</em> event to another method in the viewController.</p>
  
  <p>The problem it, that method gets called twice when the user touches the <em>UISlider</em> control. WTF? It doesn't work that way with <em>UIButtons</em> or other touch events like <em>Touch Down</em>.</p>
  
  <p>I can work around it, I think, but it seems like a bug in the way the slider control handles touches. Does anybody know why it happens?</p>
  
  <p><strong>BTW</strong>: the double touch event happens even when <em>Touch Up Inside</em> is the only connected event.</p>