ios – Swift：navigationController返回nil

在由UITabBarController实例化的UIViewController上,当我运行以下代码时,

let destination = self.storyboard?.instantiateViewControllerWithIdentifier("test")
self.navigationController!.pushViewController(destination!, animated: true)

navigationController返回nil.如何让navigationController实例推送视图控制器？

正如@Paulw11所说,缺少的是将UIViewController嵌入导航控制器中.为此,将导航控制器拖放到Storyboard,然后按CTRL从该导航控制器拖动到UIViewController,选择关系根视图控制器.