title: Authentication from app before LAContext
body: <p>I working on app in which I want to integrate Local Authentication from app, I used <code>LAContext</code> and working fine successfully.</p>
  
  <p>As we know passcode was with iPhone from beginning and <code>LAContext</code> Introduced from <strong>iOS8</strong>. </p>
  
  <ul>
  <li>I want to know how can we use Passcode or authentication within app before <strong>iOS8</strong> ? or we can't ?</li>
  </ul>
  
  <p>I know the fact that there are very few devices those are on earlier <strong>iOS8</strong> in market, but I want to quite sure about my app's least version support.</p>
  
  <p>Looking for suggestion and help. Thanks.</p>