如何为UIPageViewController启用Voice Over 3手指滑动手势

I'm using UIPageViewController in my App, however I noticed that when Voice Over is enabled, the "three finger swipe" shortcut does not work (like it does on home screen). Does anyone know if there is a standard way to enable this (like most other VO features)? Or do I need to manually detect swipe gestures myself. I'm using UIPageViewController in my App, howev