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您好如何使用SLComposeViewController CompletionHandler完成推文的通知.这是发送推文的代码

  if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter])
    {
        SLComposeViewController *tweetSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
        [tweetSheet setInitialText:@"Tweeting from my own app! :)"];
        [tweetSheet addURL:[NSURL URLWithString:@"www.someurl.com"]];

        [self presentViewController:tweetSheet animated:YES completion:NULL];
    }