title: LAContext change UIAlertController button title
body: <p>I've incorporated TouchID into my app with <code>LAContext</code>, like so:</p>
  
  <p><img src="https://i.stack.imgur.com/m5wye.png" alt="enter image description here"></p>
  
  <p>However, I'm wanting to change the name of the button title from "Enter Password" to enter "Enter Security Code" (or something like that), like this:</p>
  
  <p><img src="https://i.stack.imgur.com/KZ5UB.png" alt="enter image description here"></p>
  
  <p>How would I go about changing that button title?</p>
  
  <p>Here's the <code>LAContext</code> <a href="https://developer.apple.com/library/prerelease/ios/documentation/LocalAuthentication/Reference/LAContext_Class/index.html" rel="noreferrer">documentation</a> and here's my code:</p>
  
  <pre><code>var touchIDContext = LAContext()
  
  if touchIDContext.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &amp;msgError) {
     touchIDContext.evaluatePolicy(.DeviceOwnerAuthenticationWithBiometrics, localizedReason: touchIDMessage) {
          (success: Bool, error: NSError!) -&gt; Void in
  
          if success {
              println("Success")
          } else {
              println("Error: \(error)")
          }
      }
  }
  </code></pre>