title: Automatically launch Google Authenticator app on iOS
body: <p>Is there a supported way of launching Google Authenticator on iOS?</p>
  
  <p>I want to make it easier for customers to open the app and copy out the time-based code, before pasting it back into my app.</p>
  
  <p>I've empirically discovered that this (Swift) code will launch the app:</p>
  
  <pre><code>UIApplication.sharedApplication().openURL(NSURL(string: "otpauth://")!)
  </code></pre>
  
  <p>...but I want to know if there is a better, supported way.</p>
  
  <p>Specifically, is the otpauth:// protocol supported without arguments to simply launch the app?</p>