title: TouchId without Passcode feature
body: <p>I need for my app to login using TouchId, but I don't want the user to select or fallback into Password option. In other words I'd like to hide the 'Enter Password' label in the figure below. Thanks.</p>
  
  <p><img src="https://i.stack.imgur.com/RUI7K.jpg" alt="TouchId with Passcode option"></p>