title: iOS auto logout of application
body: <p>I am wanting to create a timer or something of sorts to auto logout the user after <em>x</em> minutes of inactivity. I would like to do it the same way the Bank of America application does it. The way the BofA app does it is even when the application is put into the background it still keeps track of the time. When the time limit is reached a notification will popup stating you are being logged out.</p>
  
  <p>How can this be done without the timer being suspended when the application goes into the background?</p>