swift - 使用 Present 查看另一个 View Controller 时看不到导航栏

Question

在从另一个 View Controller 呈现导航栏时，我无法在 View Controller 中看到导航栏

我尝试过保留

self.navigationController?.navigationBar.isHidden = false

还尝试将导航 Controller 保留到 View Controller (嵌入)。

Controller A:-

let storyboard = UIStoryboard(name: "Main", bundle: nil)

let viewController =     
storyboard.instantiateViewController(withIdentifier:"Identifier")  as! B        

present(viewController, animated: true, completion: nil)

Controller B:-

override func viewWillAppear(_ animated: Bool) {           
    super.viewWillAppear(animated)

    self.navigationController?.navigationBar.isHidden = false

} 

Answer 1

试试这个

let storyboard = UIStoryboard(name: "Main", bundle: nil)

let ViewController =
storyboard.instantiateViewController(withIdentifier:"Identifier") as! B

let vc = UINavigationController(rootViewController: ViewController)

present(vc, animated: true, completion: nil)