title: Ionic life cycle ionViewdidEnter not working
body: <p>I have an <code>ionic 2</code> app. It has a tab inside tab view. There are two tabs. <code>Home</code> and <code>Feed</code>. The <code>Feed</code> page has two new tabs , <code>Users</code> and <code>Freinds</code>. The root of <code>Feed</code> is <code>Users</code> page and <code>Users</code> page has an <code>ionViewDidEnter</code> method.</p>
  
  <p>The problem I am facing is with this method not firing when I toggle between the parent tabs <code>Home</code> and <code>Feed</code>. If I toggle between <code>Users</code> and <code>Friends</code> it works. Otherwise only the life cycles in parent components work.</p>
  
  <p>How can I solve this issue? Is there any work around to quickly fix this?</p>
  
  <pre><code>export class TabsPage {
    tab1Root: any = FeedPage;
    tab2Root: any = HomePage;
    constructor(public navCtrl: NavController , public auth: Authentication , public book: Bookemon) {}
  }
  </code></pre>
  
  <p><code>tabs.html</code></p>
  
  <pre><code>&lt;ion-tabs selectedIndex="0" tabsPlacement="top"&gt;
    &lt;ion-tab [root]="tab2Root" tabTitle="home" tabIcon="book"&gt;&lt;/ion-tab&gt;
    &lt;ion-tab [root]="tab3Root" tabTitle="feed" tabIcon="compass"&gt;&lt;/ion-tab&gt;
  &lt;/ion-tabs&gt;
  </code></pre>
  
  <p>The seconds tabs are in <code>FeedPage</code></p>
  
  <pre><code>export class FeedPage {
    tab1root = UsersPage;
    tab2root = FriendsPage;
    constructor( public navCtrl: NavController ) {}
    ionViewDidEnter () {
      // console.log('ran');
    }
  }
  </code></pre>
  
  <p>feed.html</p>
  
  <pre><code>&lt;ion-tabs selectedIndex="0" &gt;
    &lt;ion-tab [root]="tab1Root" tabTitle="users" tabIcon="bonfire"  &gt;&lt;/ion-tab&gt;
    &lt;ion-tab [root]="tab2Root" tabTitle="freinds" tabIcon="book"&gt;&lt;/ion-tab&gt;
  &lt;/ion-tabs&gt;
  </code></pre>
  
  <p>users.ts</p>
  
  <pre><code>export class UsersPage {
    constructor( public navCtrl: NavController ) {}
    ionViewDidEnter () {
      console.log('ran');
      // not running when toggling between ``feed`` and ``home``
    }
  }
  </code></pre>