Update information in the angular parent when I return to previous state

I am working with Ionic framework and Angular UI-Router. I want to update the chat's view when I return from chat-detail to chat. I have a broadcast that say to the listener when the data changes.

$rootScope.$broadcast('conversation:update');

And the listener in chat view

$scope.$on('conversation:update', function(event, conversation) {
    setTimeout(function() {
        $scope.$apply(function() {
            console.log("Updating the view");
        })
    });

});

But the problem is chat view doesn't update when I return to that view. I try to use a resolve to achieve that but it doesn't work either.

angular.module('app').controller('ChatsCtrl',function($scope, rs) {
    $scope.chats = rs;
})

It looks like the chat view was innactive when I am in chat-detail state. My router is this:

    .state('app', {
            url: "/app",
            abstract: true,
            templateUrl: "app/layout/menu-layout.html",
            controller: "GlobalCtrl"
        })
        // Modulo de chat
        .state('app.chats', {
            url: "/chats",
            views: {
                'menuContent': {
                    templateUrl: "app/chats/chats.html",
                    controller: "ChatsCtrl",
                    resolve: {
                        rs: function(Chats) {
                            return Chats.all()
                        }
                    }
                }
            }
        })

    .state('app.chat-detail', {
        url: "/chats/:chatId",
        views: {
            'menuContent': {
                templateUrl: "app/chats/chat-detail.html",
                controller: "ChatDetailCtrl"
            }
        }
    })