title: iOS - How to post to twitter similar to facebook
body: <p>I'm MGTwitterEngine in my application to post status to twitter.
  <br>
  In my settings I am having switch that decides whether to post or not. When the switch is turned on and if twitter engine is not authorized, i'm asking for twitter login. And able to post to twitter.
  <br>
  But when I quit the app and start again, its not authorized any more.<br>
  But if you see facebook library for iOS, it retains the session between different app start ups. How can I make my app remember the twitter authentication when ever I restart my app?</p>