This is not possible - you need to use it MFMessageComposeViewController.
Usage example MFMessageComposeViewControllerfor copying your own text:
MFMessageComposeViewController *viewController = [[MFMessageComposeViewController alloc] init];
viewController.body = yourTextField.text;
[self presentModalViewController:viewController animated:YES];
yourTextField - UITextField UITextView .
, messageComposeDelegate (, self) MFMessageComposeViewControllerDelegate, , .