title: How can I have an NSTimer going throughout the entire time the user is in the app?
body: <p>How can I have an NSTimer going throughout the entire time the user is in the app?</p>
  
  <p>I want to be able to change view controllers and perform different functions, all while a timer is going on int the background.  If the timer hits 0, then I want to fire an event.  Can I also have a timer going inside the app while the app is in the background?  Or even when the iPhone's screen is off?</p>
  
  <p>Thanks for the answers!</p>