Ionic override all BACK button behaviour for specific controller

Question

I want to be able to override the BACK button on the navigation bar, and the hardware button.

I want this override to be for one specific controller, but not for the

Answer 1

Took the feedback from @raven.zuo and made some amends to un-register the state change event.

(function () {
    'use strict';

    angular
        .module('appName')
        .service('customBackButtonService', customBackButtonService);

    customBackButtonService.$inject = ['$rootScope', '$ionicPlatform'];
    function customBackButtonService($rootScope, $ionicPlatform) {

        var service = {
            setup: setup
        };

        return service;

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

        function setup(customBackFunction) {
            // override soft back
            // framework calls $rootScope.$ionicGoBack when soft back button is pressed
            $rootScope.oldSoftBack = $rootScope.$ionicGoBack;
            $rootScope.$ionicGoBack = function () {
                customBackFunction();
            };
            var deregisterSoftBack = function () {
                $rootScope.$ionicGoBack = $rootScope.oldSoftBack;
            };

            // override hard back
            // registerBackButtonAction() returns a function which can be used to deregister it
            var deregisterHardBack = $ionicPlatform.registerBackButtonAction(
                customBackFunction, 101
            );

            // cancel custom back behaviour
            var backStateChangeWatcher = $rootScope.$on('$stateChangeStart', function () {
                if($rootScope.oldSoftBack){
                    deregisterHardBack();
                    deregisterSoftBack();

                    // Un-register watcher
                    backStateChangeWatcher();
                }
            });
        }
    }
})();

//Called via:

    customBackButtonService.setup(function () {
        console.log('custom back');
    });