Angularjs 动态更改网络状态的显示

我正在使用我的ionic 1应用程序

检测网络状态没有问题。然而，我遇到的一个问题是，当我将网络从wifi改为4G时。状态无法动态更改，它仍将在视图中显示wifi。我可以知道如何动态更改状态吗

下面是我的代码。非常感谢

controller.js

.controller(‘NetworkCtrl', function($scope) {
    var networkState = navigator.connection.type;
    var states = {};
    states[Connection.UNKNOWN]  = 'Unknown connection';
    states[Connection.ETHERNET] = 'Ethernet connection';
    states[Connection.WIFI]     = 'WiFi connection';
    states[Connection.CELL_2G]  = 'Cell 2G connection';
    states[Connection.CELL_3G]  = 'Cell 3G connection';
    states[Connection.CELL_4G]  = 'Cell 4G connection';
    states[Connection.CELL]     = 'Cell generic connection';
    states[Connection.NONE]     = 'No network connection';
    $scope.networkstatus = states[networkState];
})

Network.html

 {{networkstatus}}