title: React Native - NavigatorIOS - Disable pop gesture
body: <p>I am trying to disable the swipe back gesture in NavigatorIOS which pops the current scene.</p>
  
  <p>I have seen methods using Navigator.SceneConfigs but none of this applies to NavigatorIOS.</p>
  
  <p>My current code as it stands is as follows.</p>
  
  <pre><code>&lt;NavigatorIOS
      style={styles.container}
      initialRoute={{
          title: 'Favourites',
          component: Favourites,
          passProps: {
              content: this.state.content,
              user: this.state.userLoggedIn,
              favsPage: false,
              setFavourites: this.setFavourites,
              alterContent: this.alterContent,
              retrieve: this.retrieve,
              retrieveContent: this.retrieveContent,
              events: this.eventEmitter
          }
      }}/&gt;
  </code></pre>