ios - 导航 Controller 无法正常工作

Question

在显示第一个 VC 后，我有了导航 Controller 。我正在使用 perform segue 通过 performSegue(withIdentifier: "secondVC", sender: nil) 从第一个 vc 导航到第二个页面，我的边栏出现了。但是，当我尝试从 First vc 转到第三页时，它没有导航。所以，我尝试使用以下代码

let thirdVC = self.storyboard?.instantiateViewController(withIdentifier: "thirdVC") as! ThirdVC
navigationController?.pushViewController(thirdVC, animated: true)

它工作正常，但当我使用上面的代码时，我的导航栏消失了。我怎样才能从第一个 vc 到第三个？

Answer 1

你可以试试这个

let thirdVC = self.storyboard?.instantiateViewController(withIdentifier: "thirdVC") as! ThirdVC
navigationController?.isNavigationBarHidden = false  
//Make sure navigation controller should be there
navigationController?.pushViewController(thirdVC, animated: true)