title: How do I Login inside app to use GPPNativeShareBuilder of Google API in Objective C?
body: <p>I am using <code>Google Plus API</code> for login purpose. </p>
  
  <p>My app rejects once due to <code>GPPSignIn (Not Google login within app)</code>, then I used <code>GTMOAuth2Authentication</code> for login with Google. This allow me to login inside my app. <br>
  This goes well. </p>
  
  <p>I am worrying about share on Google, for same issue (rejection), I implemented <code>GPPNativeShareBuilder</code>, which allows me to share within app, but this goes out of app for login, when tried with same <code>GTMOAuth2Authentication</code> this gives me error message:- </p>
  
  <pre><code>[GPPNativeShareBuilderImpl open] User must be signed in to use the native share box. 
  </code></pre>
  
  <p>I used this also </p>
  
  <blockquote>
    <p>GTLServicePlus* plusService = [[GTLServicePlus alloc] init];<br>
    [plusService setAuthorizer:self.auth];  // authentication object!!!</p>
  </blockquote>
  
  <p>This produces same warning error, not presents share dialog. </p>
  
  <p>Help me, Thanks in advance.</p>