title: App Update issue
body: <p>Hi everybody I have an issue in my app. I need to determine if my app has has been updated to some point. I found out with this method how I can get the current version </p>
  
  <pre><code> NSString *first = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
  
   NSString *second = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];
  </code></pre>
  
  <p>If the app is updated from itunes, Who var is changed to determine my app has been updated because I prove by modification from xcode in the Targets>Summary>Version to prove .The first var changes but the second does not change.</p>
  
  <p>What I have to select the first or the second,  and how I can prove this?</p>