title: How to make my iphone vibrate twice when I click on a button?
body: <p>I search to make vibrate twice my iphone when I click on a button (like a sms alert vibration)</p>
  
  <p>With <code>AudioServicesPlayAlertSound(SystemSoundID(kSystemSoundID_Vibrate))</code>
  I obtain just one normal vibration but I want two shorts :/.</p>