objective-c – SLComposeViewController CompletionHandler

- (void)showTweetSheet
{
  //  Create an instance of the Tweet Sheet
  SLComposeViewController *tweetSheet = [SLComposeViewController
                                         composeViewControllerForserviCEType:
                                         SLserviCETypeTwitter];

  // Sets the completion handler.  Note that we don't kNow which thread the
  // block will be called on,so we need to ensure that any UI updates occur
  // on the main queue
  tweetSheet.completionHandler = ^(SLComposeViewControllerResult result) {
    switch(result) {
        //  This means the user cancelled without sending the Tweet
      case SLComposeViewControllerResultCancelled:
        break;
        //  This means the user hit 'Send'
      case SLComposeViewControllerResultDone:
        break;
    }

    //  dismiss the Tweet Sheet
    dispatch_async(dispatch_get_main_queue(),^{
      [self dismissviewControllerAnimated:NO completion:^{
        NSLog(@"Tweet Sheet has been dismissed.");
      }];
    });
  };

  //  Set the initial body of the Tweet
  [tweetSheet seTinitialText:@"just setTing up my twttr"];

  //  Adds an image to the Tweet.  For demo purposes,assume we have an
  //  image named 'larry.png' that we wish to attach
  if (![tweetSheet addImage:[UIImage imagenamed:@"larry.png"]]) {
    NSLog(@"Unable to add the image!");
  }

  //  Add an URL to the Tweet.  You can add multiple URLs.
  if (![tweetSheet addURL:[NSURL URLWithString:@"http://twitter.com/"]]){
    NSLog(@"Unable to add the URL!");
  }

  //  Presents the Tweet Sheet to the user
  [self presentViewController:tweetSheet animated:NO completion:^{
    NSLog(@"Tweet sheet has been presented.");
  }];
}