ti_eventlistener_helper.js

var listenOnce = function(event, handler) { 
  var handlerWrapper = function() { 
    handler();
    Ti.App.removeEventListener(event, handlerWrapper);
  };
  Ti.App.addEventListener(event, handlerWrapper);
};

var listenButUnregisterWhenClose = function( win, hash ) {
  _.each(hash, function(handler, event) {
    Ti.App.addEventListener(event, handler);
    win.addEventListener('close', function() {
      log('unregistering' + event);
      Ti.App.removeEventListener(event, handler); // make sure we unlisten on the way out
    });
  });
};


// Usage:
  listenButUnregisterWhenClose(win, {
    'app:checklists:show:refreshOnFocus': function() {
      refreshOnFocus = true; 
      Ti.App.fireEvent('app:checklists:index:refreshOnFocus'); // bubble
    }
  });