How to use

ViewController

in

ionic-angular

// ////////////////////////////////////////////////////////////////////////
  //
  //

  isActive ( page : any )
  {
    // console.log ( `::isActive`, page );

    let childNav = this.nav.getActiveChildNav ( );

    // Tabs are a special case because they have their own navigation

    if ( childNav )
    {
      if ( childNav.getSelected() && childNav.getSelected().root === page.tabComponent )
      {
        return 'primary';
      }

      return;
    }

    if ( this.nav.getActive() && this.nav.getActive().component === page.component )
    {
      return 'primary';
    }

    return;
  }