iOS: Publish tweet.

gistfile1.m

if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter]) {
  SLComposeViewController *tweetSheetOBJ = [SLComposeViewController
                                                  composeViewControllerForServiceType:SLServiceTypeTwitter];
  [tweetSheetOBJ setInitialText:@"My tweet"];
  [self presentViewController:tweetSheetOBJ animated:YES completion:nil];
}