title: Cannot find protocol declaration 'FIRMessagingDelegate'
body: <p>I'm trying to add Firebase Messaging to my iOS app. I've followed the steps in the <a href="https://firebase.google.com/docs/notifications/ios/console-audience" rel="noreferrer">Firebase documentation</a>, namely:</p>
  
  <ul>
  <li>Uploaded the APNs Certificate</li>
  <li>Imported Firebase and added <code>[FIRApp configure]</code></li>
  <li>Imported Firebase Messaging with <code>@import FirebaseMessaging</code> and added <code>FIRMessagingDelegate</code></li>
  </ul>
  
  <p>However at this point I get an error:</p>
  
  <pre><code>@interface AppDelegate () &lt;UNUserNotificationCenterDelegate, FIRMessagingDelegate&gt;      
  // Cannot find protocol declaration for FIRMessagingDelegate
  </code></pre>
  
  <p>I've updated my pods (suggested by similar issues found on Stack Overflow), but still get the same error. To confirm, running <code>pod update</code> gives the following output:</p>
  
  <pre><code> Using FirebaseMessaging (1.2.2)
  </code></pre>
  
  <p>Any suggestions?</p>