[TIMOB-3110] iOS: Support VoiceOver Accessibility

   var tabGroup = Ti.UI.createTabGroup({orientationModes: [Ti.UI.PORTRAIT]}),
   winViews = Ti.UI.createWindow({
       title: "View Properties",
       layout: "vertical",
       backgroundColor: "#fff"
   }),
   winTable = Ti.UI.createWindow({
       title: "Table",
       layout: "vertical",
       backgroundColor: "#fff"
   }),
   winEvents = Ti.UI.createWindow({
       title: "Events",
       layout: "vertical",
       backgroundColor: "#fff"
   }),
   tabViews = Ti.UI.createTab({
       window: winViews,
       title: winViews.title
   }),
   tabTable = Ti.UI.createTab({
       window: winTable,
       title: winTable.title
   }),
   tabEvents = Ti.UI.createTab({
       window: winEvents,
       title: winEvents.title
   }),
   announceButton = Ti.UI.createButton({
       top: 16, width: 8 * 30, height: 48,
       title: "Make announcement"
   }),
   basicButton = Ti.UI.createButton({
       top: 16, width: 8 * 14, height: 48,
       title: "Basic",
       accessibilityHint: "Hint: pressing on this button does nothing."
   }),
   differentButton = Ti.UI.createButton({
       top: 16, width: 8 * 14, height: 48,
       title: "Different",
       accessibilityLabel: "This button has different text for accessibility."
   }),
   sw = Ti.UI.createSwitch({
       value: false,
       accessibilityLabel: "My special switch.",
       accessibilityValue: "Off.",
       top: 16
    
   }),
    
   eventLog = Ti.UI.createLabel({
       top: 16, left: 32, right: 32,
       height: Ti.UI.SIZE,
       verticalAlign: Ti.UI.TEXT_VERTICAL_ALIGNMENT_TOP,
       accessibilityLabel: "My special label.",
       accessibilityValue: "No value.",
       accessibilityHint: "No action",
       accessibilityHidden: true
   }),
   versionParts = Ti.Platform.version.split(".");
    
   var buttonbarObjects = [
       {title:'Toggle Style', width:110, enabled:false},
       {image:'images/slider_thumb.png', width:50, accessibilityLabel: 'middle image'},
       {title:'Toggle Enabled', width:140}
   ];
   var bb4 = Titanium.UI.createButtonBar({
       labels:buttonbarObjects,
       backgroundColor:'red',
       style:Titanium.UI.iPhone.SystemButtonStyle.BAR,
       width:'auto'
   });
    
   sw.addEventListener("change", function() {
       if (sw.value) {
           sw.accessibilityValue = "On.";
           sw.accessibilityHint = "Double tap to turn off."
       } else {
           sw.accessibilityValue = "Off.";
           sw.accessibilityHint = "Double tap to turn on."
       }
   });
    
   announceButton.addEventListener("click", function() {
       Ti.App.fireSystemEvent(Ti.App.EVENT_ACCESSIBILITY_ANNOUNCEMENT,
                              "Please stand by for an urgent message from the Department of Home Land Security.");
   });
    
   function updateEventLog() {
       eventLog.text = "This label has the accessibilityHidden property set to true. ";
       eventLog.text += "This tells the accessibility service to ignore it. ";
       eventLog.text += "\n\n";
       eventLog.text += (Ti.App.accessibilityEnabled ? "Accessibility is enabled." : "Accessibility is disabled.");
       eventLog.text += "\n\nIf you go to Settings/General/Accessibility and disable/enable VoiceOver, the change will be reflected here.\n";
   }
    
   Ti.App.addEventListener(Ti.App.EVENT_ACCESSIBILITY_CHANGED, function(e) {
       updateEventLog();
   });
    
   var tableData = [ {title: 'Apples', accessibilityLabel:'Eat apples'}, {title: 'Bananas'}, {title: 'Carrots'}, {title: 'Potatoes'} ];
   var table = Ti.UI.createTableView({
     data: tableData
   });
   
   updateEventLog();
    
   winViews.add(basicButton);
   winViews.add(differentButton);
   winViews.add(sw);
   winViews.add(bb4);
   winTable.add(table);
   winEvents.add(announceButton);
   winEvents.add(eventLog);
    
   tabGroup.addTab(tabViews);
   tabGroup.addTab(tabTable);
   tabGroup.addTab(tabEvents);
   tabGroup.open();