Ionic : $ionicPlatform.isIOS() does not working in controller method

i'm trying to get working method $ionicPlatform.isIOS, to get boolean value by the used platform where is app running.

I tried it on Android device and In Chrome Browser, but without any success result.

  $scope.getDeviceInfo = function() {

        $scope.isIOS = $ionicPlatform.isIOS();
        alert($ionicPlatform.isIOS());
  }

Code above is returning following exception:

Uncaught TypeError: undefined is not a function

What i'm doing wrong please?

The $ionicPlatform service provider does not contain a function isIOS(). You can see it in this documentation.

What you can do though to check if it is iOS, is using the following function:

$scope.isIOS = ionic.Platform.isIOS();

Found in this documentation.