harness/app-assets/templates/assets/js/modules/sharing.js

define(function () {

    'use strict';

    var modules = {
        nativeSharing: function(_window, service, url, title){
            var action;

            if(service === 'facebook'){
                action = 'x-gu://facebookshare/';
            }
            
            if(service === 'twitter'){
                action = 'x-gu://twittershare/';
            }

            if(action && url){
                action = action + '?url=' + encodeURIComponent(url);

                if(title){
                    action = action + '&title=' + encodeURIComponent(title);
                }

                _window.location.href = action;
            }
        }
    };

    function bootstrap(_window) {
        if (document.body.classList.contains('ios')) {
            _window.nativeSharing = modules.nativeSharing.bind(modules, _window);
        }
    }

    return {
        init: bootstrap
    };
});