导航栏已删除

Question

我在我的应用中使用了导航项。在注销方法中，我已经弹出到根视图控制器，即我的loginViewController，但是在执行此操作时导航栏被删除了。我尝试将代码加载到viewWillAppear中，但仍然无法正常工作。你能帮我吗？

这是我的注销代码：

@IBAction func btnLogOutClicked(_ sender: Any) {
        let log : LoginViewController = self.storyboard?.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
        let window:UIWindow = UIApplication.shared.keyWindow!
        let navControl : UINavigationController = window.rootViewController as! UINavigationController
        if (!(navControl .isEqual(log)))
        {
            window.rootViewController = log
        }
        navControl.popToRootViewController(animated: true)
    }

我的viewWillAppear-

override func viewWillAppear(_ animated: Bool) {
        self.navigationController?.isNavigationBarHidden = false
        self.navigationItem.hidesBackButton = true
        self.navigationItem.title = "Select Client"
        // create a new butto
        let button: UIButton = UIButton(type: UIButtonType.custom)
        //set image for button
        button.setImage(UIImage(named: "logo-icon"), for: UIControlState.normal)
        //set frame
        button.frame = CGRect(x: 0, y: 0, width: 50, height: 30)
        let barButton = UIBarButtonItem(customView: button)
        //assign button to navigationbar
        self.navigationItem.leftBarButtonItem = barButton


    }

这是我的故事板-

我正在使用pushViewController从登录视图控制器访问标签栏控制器

Answer 1

尝试下面的代码来更改NavigationController堆栈：

let oldVCs = self.navigationController?.viewControllers
let newVCs = [UIViewController]()

 // Add your root VC in new array of VCs
 newVCs.append(oldVCs![0])
 // Add your new VC just after your root VC
 let log : LoginViewController = self.storyboard?.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController

 newVCs.append(log)

 self.navigationController?.setViewControllers(newVCs , animated: true)

在这种动画中，就像将新控制器推入堆栈一样。

如果要完全离开该堆栈并创建一个新堆栈：

let log : LoginViewController = self.storyboard?.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController

let loginNavigationController = UINavigationController(rootViewController: log)            
self.view.window?.rootViewController = loginNavigationController