UIActivityViewControllerでTwitterの時だけハッシュタグをつける実装呼び出し

gistfile1.m

- (IBAction)share:(id)sender
{
    ActivityText *text = [[ActivityText alloc] initWithText:@"本文はこちらです。" hashTag:@"ハッシュタグ"];
    UIActivityViewController *avc = [[UIActivityViewController alloc] initWithActivityItems:@[text] applicationActivities:nil];
    [self presentViewController:avc animated:YES completion:nil];
    
    
}