Demonstrate setting value on service when query param changes

controllers.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';
import { alias } from '@ember/object/computed';

export default Ember.Controller.extend({
  mobileView: service(),
  
  appName: 'Ember Twiddle',
  
  queryParams: [ 'webview' ],
  
  webview: alias('mobileView.isWebview'),
  
  actions: {
  	toggleWebview() {
    	this.toggleProperty('webview');
    }
  }
});

services.mobile-view.js

import Ember from 'ember';
import { readOnly } from '@ember/object/computed';
import { computed, get, set } from '@ember/object';

export default Ember.Service.extend({
  isWebview: false
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

Controller: {{webview}}<br>
Service: {{mobileView.isWebview}}<br>

<button type="button" {{action "toggleWebview"}}>Toggle webview query param</button>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}