title: NSTimer After User Leaves App
body: <p>I am creating an iOS app in Objective C. I don't want to pay for a server, but I want to create a reward system so that every 3 hours the user is rewarded with "coins" when they enter the app. For example, if a user exits the app at 1pm and re-enters the app at 5pm, a reward will be ready. However I want this to carry over even if the app is not running in the background.</p>
  
  <p>Is this possible?</p>