How to hide <img> using md-switch - angularjs

Question

angular-material newbie here. I'm trying to hide some elements in our site using a switch, as instructed by our client. This led me to angular-material's md-switch.
So I tried incorporating it like so...
<md-switch md-no-ink aria-label="switchView" ng-model="switchView">{{switchView}}</md-switch>
And called the value of the switch in my element like this:
<img ng-src="{{photoPath}}" class="profilePic" ng-hide="switchView"/>
After testing it though, it didn't hide my <img> even though my switchView changed its value. Am I missing something here?
Other methods I've tried:
Adding ng-change to my md-switch, which called a function that would equate another variable (e.g. $scope.toggleView = $scope.switchView) with switchView's value. $scope.toggleView would then be used in my ng-hide.
ng-hide = "switchView == true".
Any advice would be very much appreciated. Thank you.
UPDATE 1: To test it, I tried hiding the <div> beside my <md-switch> and it worked perfectly. However it's still not working with my <img>.
Further checking revealed that it was inside a <nav> element. However they're both using the same controller. I wonder if that's the problem? I assumed that it shouldn't be a problem because of this.
The structure is like this:
<nav ng-controller="MainController">
<!-- other navigation elements here -->
<img ng-src="{{photoPath}}" class="profilePic" ng-hide="switchView"/>
</nav>
<div ng-controller="MainController">
<div>Toggle Switch</div>
<md-switch md-no-ink aria-label="switchView" ng-model="switchView">{{switchView}}</md-switch>
</div>
UPDATE 2: I've added the following code in my JS file because there are plans to hide elements in other pages. It still didn't work.
$scope.onChange = function(value) {
$scope.$broadcast("view_mode", $scope.switchView);
}
$scope.$on("view_mode", function(event, switchValue) {
$scope.viewThis= switchValue;
});
My HTML now looks like this:
<img ng-src="{{photoPath}}" class="profilePic" ng-hide="viewThis"/>
As for the controller, ngMaterial was called in a separate JS file (our main), together with all our dependencies and configs. Hence, this wasn't called inside MainController.
mainApp.js
var app = angular.module('myAppModule', [
// other references here
'ngMaterial'
]);
mySample.js
angular
.module('myAppModule')
.controller('MainController', ['$scope', function ($scope) {
// functions etc. go here
Hope this helps clear things up. Thank you.

Answer 1

Try something like this, its a trivial example but hope it helps. Here's a link to working codepen.
There seems to be a couple ways you could handle this according to the docs:
Angular Material- MD-Switch
function exampleController($scope) {
$scope.secondModel = false;
$scope.onChangeEvent = function(value) {
$scope.imgSource = (value) ? 'http://www.fillmurray.com/300/200' : 'http://www.fillmurray.com/g/155/300';
};
// alternatively: you could set the ternary to empty string value here.
}
angular
.module('BlankApp', ['ngMaterial'])
.controller('exampleController', exampleController);
<md-switch ng-model="switchValue" ng-change="onChangeEvent(switchValue)">
<img ng-src="{{imgSource}}" alt="" />
</md-switch>
<md-switch ng-model="secondModel">
<img src="http://www.fillmurray.com/300/200" alt="" ng-hide="secondModel" />
</md-switch>

Answer 2

Thank you to everyone who gave their inputs. After some research, I managed to solve this problem using factories (source).
I'm sharing my solution so that it may help others who experience the same problem.
HTML:
<nav ng-controller="MainController">
<!-- other navigation elements here -->
<img ng-src="{{photoPath}}" class="profilePic" ng-hide="switchView"/>
</nav>
<div ng-controller="MainController">
<div>Toggle Switch</div>
<md-switch md-no-ink aria-label="switchView" ng-model="switchView" ng-change="onChange(switchView)">{{switchView}}</md-switch>
</div>
JS:
angular
.module('myAppModule')
.controller('MainController', ['$scope', 'ViewModeFactory', function ($scope, ViewModeFactory) {
// functions etc. go here
// For client presentation mode
$scope.onChange = function(value) {
ViewModeFactory.setViewMode($scope.switchView);
}
$scope.$watch(function (){
$scope.switchView = ViewModeFactory.getViewMode();
});
}])
.factory('ViewModeFactory', function () {
var data = {isViewMode: ''};
return {
getViewMode: function () {
return data.isViewMode;
},
setViewMode: function(value) {
data.isViewMode = value;
}
};
});
I used factories so that other controllers in our site can use the value passed by md-switch.
Hope this helps.