textViewHeight

(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
CGRect frame = textView.frame;
float height;
if ([text isEqual:@""]) {

  if (![textView.text isEqualToString:@""]) {

      height = [ self heightForTextView:textView WithText:[textView.text substringToIndex:[textView.text length] - 1]];

  }else{

      height = [ self heightForTextView:textView WithText:textView.text];
  }

}else{

      height = [self heightForTextView:textView WithText:[NSString stringWithFormat:@"%@%@",textView.text,text]];

}

frame.size.height = height;
[UIView animateWithDuration:0.5 animations:^{

      textView.frame = frame;

  } completion:nil];

return YES;
}