title: How to know which icon is clicked in UIActivityViewController before activityController setCompletionHandleris called?
body: <p>How to know which icon is clicked in <code>UIActivityViewController</code> before  <code>activityController setCompletionHandler:^(NSString *activityType, BOOL completed)</code>  is  called  ?</p>
  
  <p>I want to share different text for sharing with twitter and facebook. </p>
  
  <pre><code>-(IBAction)btnSharePressedFromOffersDetail:(id)sender
  {
  NSString *posturl= @"facebook or twitter";
  UISimpleTextPrintFormatter *printData = [[UISimpleTextPrintFormatter alloc]init];
  NSArray *Itemsarray=@[posturl,printData];
  UIActivityViewController *activityController = [[UIActivityViewController alloc]initWithActivityItems:Itemsarray applicationActivities:nil];
  [self presentViewController:activityController
                     animated:YES completion:nil];
  [activityController setCompletionHandler:^(NSString *activityType, BOOL completed)
  {
       NSLog(@"Activity = %@",activityType);
       NSLog(@"Completed Status = %d",completed);  
       if (completed)
       {
           UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@""
                                                           message:@"Thanks for sharing!"
                                                          delegate:nil
                                                cancelButtonTitle:@"OK"
                                                 otherButtonTitles:nil];
           [alert show];
       }
       else
       {       
       }
   }];
  }
  </code></pre>