javascript - ng-if not catching updated $scope values -

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i have been away angular 1.x long seem have forgotten important ng-if. have function updates scope value whenever carousel changes images tracking active index of carousel array. have ng-if set remove 1 element , insert when index reaches end of array, this: 

  <span ng-if="activeindex < 4"         class="back-button"         ui-sref="app.profile.index({uid: user.uid})">     skip <i class="ion-chevron-right"></i>   </span>    <span ng-if="activeindex === 4"         class="skip-button"         ui-sref="app.profile.index({uid: user.uid})">     continue <i class="ion-chevron-right"></i>   </span>

but isn't working. believe ng-if creates new scope may why isn't catching updated values, if case, easy way update scope of ng-if? or turned around?

here's codepen showing problem: http://codepen.io/datatype_void/pen/zqjgor?editors=1001

i added $scope.$apply(); after activeindex change, , solved problem.

function(swiper){   $scope.activeindex = swiper.activeindex;   $scope.$apply();

though i'm not sure why isn't applied automatically.

working code: http://codepen.io/c14l/pen/bpkrlo?editors=1111

(also changed max value 2 because never got 4 before, wasn't problem.)


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