title: ios MFMessageComposeViewController ipod crash
body: <p>Hi I am using <code>MFMessageComposeViewController</code> for messaging in an iPhone app.
  As this is an iPhone app it also supports iPod. And when clicking on the message button the app crashes as messaging is not available on iPod. So is there a way to check whether the device is an iPod so that i can hide the message button so that the user may not click on message in iPod and crash.</p>
  
  <p>This is the code I have used for messaging.</p>
  
  <pre><code>- (IBAction)Message:(id)sender
  {
  MFMessageComposeViewController *messaging=[[MFMessageComposeViewController alloc]init];
  messaging.messageComposeDelegate=self;
  [messaging setBody:@"Will of the People""\n""http://bit.ly/1gZhZye"];
  
  [self presentViewController:messaging animated:YES completion:nil];
  }
  
  
  - (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
  {
  [self dismissViewControllerAnimated:YES completion:^{UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Done" message:nil delegate:self cancelButtonTitle:@"Close" otherButtonTitles:nil];
      [alert show];
  }];
  }
  </code></pre>
  
  <p>And this seems to be working fine in iPhone. I need a way to disable this button when the user is using iPod.</p>