title: IOS : SA_OAuthTwitterController callback after authorization
body: <p>I m using for the first time the twitter rush exemple to handle posts on twitter , all goes well excepts I want to post the message immedialy after the autorization , and I dont know how to make a callback after autorization</p>
  
  <pre><code>if(!_engine){  
      NSLog(@"init SA_OAuthTwitterEngine");
      _engine = [[[SA_OAuthTwitterEngine alloc] initOAuthWithDelegate:self] retain];  
      _engine.consumerKey    = kOAuthConsumerKey;  
      _engine.consumerSecret = kOAuthConsumerSecret;  
  }   
  
  
  
  if(![_engine isAuthorized]){ 
  
      UIViewController *controller = [SA_OAuthTwitterController controllerToEnterCredentialsWithTwitterEngine:_engine delegate:self];  
  
      if (controller){  
          [self presentModalViewController: controller animated: YES];  
      }  
  
  }     
  </code></pre>
  
  <p>Here are the callbacks , but I dont know how to access _engine inside it :</p>
  
  <pre><code>- (void) storeCachedTwitterOAuthData: (NSString *) data forUsername: (NSString *) username {
  NSLog(@"storeCachedTwitterOAuthData");
  NSUserDefaults          *defaults = [NSUserDefaults standardUserDefaults];
  
  [defaults setObject: data forKey: @"authData"];
  [defaults synchronize];
  
  }
  
  - (NSString *) cachedTwitterOAuthDataForUsername: (NSString *) username {
  NSLog(@"cachedTwitterOAuth");
  return [[NSUserDefaults standardUserDefaults] objectForKey: @"authData"];
  }
  </code></pre>