如何为searchResultsUpdater设置另一个ViewController？我试着这样做，但结果没有更新。letsearchNav=storyboard!.instantiateViewController(withIdentifier:"SearchControllerNav")as!UINavigationControllerletvc=searchNav.topViewControlleras!PageMenuVCletsearchVC=storyboard!.instantiateViewController(withIdentifier:"SearchVC")as!