[TIMOB-8383] iOS: Feature to add a property to detect if keyboard is being displayed or not

   
   var win = Ti.UI.createWindow({
   	backgroundColor:'white'
   });
   var input = Ti.UI.createTextField({
   	width:200,
   	height:40,
   	value:'click me',
   	top:20,
   	borderStyle:Ti.UI.INPUT_BORDERSTYLE_LINE
   });
   
   function isVisible() {
   	input.value = 'visible? '+Ti.App.keyboardVisible;
   }
   
   input.addEventListener('click', isVisible);
   
   var button = Ti.UI.createButton({
   	width:200,
   	height:40,
   	title:'keyboard visible?',
   	top:80
   });
   button.addEventListener('click', isVisible);
   
   win.add(input);
   win.add(button);
   win.open();