title: OneSignal library iOS - linker command failed with exit code 1
body: <p>i'm trying to import OneSignal library into my Swift project. I use official guide: <a href="https://documentation.onesignal.com/docs/ios-sdk-setup" rel="nofollow">https://documentation.onesignal.com/docs/ios-sdk-setup</a></p>
  
  <p>I keep getting this error:</p>
  
  <pre><code>linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p><a href="http://i.stack.imgur.com/zORIa.png" rel="nofollow">Error image</a></p>
  
  <p>Thanks you</p>