title: Update UITextView string from UITextField immediately
body: <p>I have a UITextView that says "This burger is ______" and I have an empty UITextField below it. I want it so that every character you type into the UITextField, the UITextView is updated immediately.</p>
  
  <p>Right now, I have this implemented</p>
  
  <pre><code>- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
  NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
  NSString *stringWithTasty = [TextThisBurgerIs.text stringByAppendingString:newString];
  
  [TextThisBurgerIs setText:stringWithTasty];
  
  return YES;
  }
  </code></pre>
  
  <p>When I run the app and I want to type in tasty into the UITextField, this is what I get as the UITextView:</p>
  
  <pre><code>UITextView: "This burger is t ta tas tast tasty"
  UITextField: "tasty"
  </code></pre>
  
  <p>It's replacing the "This burger is_____" string with the new version of the string that I'm making. I've set the UITextField as the delegate</p>
  
  <p>Halp.</p>