title: How to do Clock ringing with app in background?
body: <p>I am making an alarm clock app and I am going to ask that one question that perhaps has been asked a million times before.</p>
  
  <p>When a user sets date &amp; time in my alarm clock app using UIDate picker and hits the home button on his iPhone or closes his phone, making my app go in the background, how can I still do a ringing sound to wake him up?</p>