我已经从ViewA导航到ViewB(使用新的导航Controller和黑色导航栏)查看一个Controller://WithNavigationControllerletstoryBoard:UIStoryboard=UIStoryboard(name:"ViewB",bundle:nil)letnewViewController=storyBoard.instantiateViewController(withIdentifier:"ViewB")as!ViewBControllerletnavCont=UINavigationController(rootViewControlle