Ionic slider not showing content initially - angularjs

Question

When i load a template on click of button using $state.go() slider embedded in template not displaying its content.
When i rotated my device then it start showing the slides.
Please sugggest what i am missing in this code snippet of template.
<ion-slide-box on-slide-changed="" show-pager="true">
<ion-slide ng-repeat="placementStep in placementSteps">
<div class="list card">
<div class="item-divider">
<div class="row">
<div class="col">
<h1 class="title">{{placementStep.stepName}}</h1>
</div>
<div class="col">
<button class="button icon ion-chevron-right button-positive button-small right" ng-if="$index!=placementSteps.length-1&& placementStep.studentsForStep.length!=0" ng-click="moveStudents(placementStep,placementSteps,0)"></button>
<button class="button icon ion-chevron-left button-positive button-small right" ng-if="$index!=0 && placementStep.studentsForStep.length!=0" ng-click="moveStudents(placementStep,placementSteps,1)"></button>
</div>
</div>
</div>
<ion-list show-reorder="data.showReorder" can-swipe="false" ng-class="has-header">
<ion-item ng-repeat="student in placementStep.studentsForStep">
<div class="row">
<div class="left checkbox">
<input type="checkbox" ng-checked="student.checked==true" ng-model="student.checked">
</div>
<div class="col vertical-center">
{{student.first_name}}
</div>
</div>
</ion-item>
</ion-list>
</div>
</ion-slide>
</ion-slide-box>
</ion-content>

Answer 1

Call This function,
$ionicSlideBoxDelegate.update();
Immediately after loading the image files or directly within the controller definition for that view.
notice the absence of of the getbyhandle();

Answer 2

I used delegate handle to update the slide box after loading data. It worked.
$ionicSlideBoxDelegate.$getByHandle('placementStepSlideBox').update();
Where "placmentStepSlideBox" is the delegate handle name.