[英]Change rootviewcontroller after logout
I have used SceneDelegate to change the rootviewcontroller after login action.我已经使用 SceneDelegate 在登录操作后更改 rootviewcontroller。 ?It works fine but when I logout I am not able to perform navigation again.
?它工作正常,但当我注销时,我无法再次执行导航。
Here is my code for Scenekit:这是我的 Scenekit 代码:
let status = UserDefaults.standard.bool(forKey: UserDefaultKeys.status)
var rootVC : UIViewController?
if(status == true){
rootVC = UIStoryboard(name: AppStoryBoardName.main, bundle: nil).instantiateViewController(withIdentifier: TabBarViewController.className) as? TabBarViewController
}else{
rootVC = UIStoryboard(name: AppStoryBoardName.main, bundle: nil).instantiateViewController(withIdentifier: LoginViewController.className) as? LoginViewController
}
guard let root = rootVC else {return }
let nav = UINavigationController(rootViewController: root)
window?.rootViewController = nav
My logout code:我的注销代码:
appUserDefaults.set(false, forKey: UserDefaultKeys.status)
appUserDefaults.synchronize()
let loginVC = self.storyboard?.instantiateViewController(withIdentifier: LoginViewController.className) as? LoginViewController
let window = UIApplication.shared.windows.first
window?.rootViewController = loginVC
And my login Button Action: (It doesnt works after logout action)我的登录按钮操作:(注销操作后不起作用)
guard let controller = self.storyboard?.instantiateViewController(withIdentifier: VerificationViewController.className) as? VerificationViewController else { return }
controller.mobile = phoneTextField.text ?? ""
self.navigationController?.pushViewController(controller, animated: true)
It is not working because there is an inconsistency in hierarchy of view-controllers on logout button action and in sceneKit.它不起作用,因为注销按钮操作和sceneKit中的视图控制器层次结构不一致。 In sceneKit code you are embedding your
LoginViewController
in navigation controller and then assign the navigation controller as the windows root view-controller.在sceneKit 代码中,您将
LoginViewController
嵌入到导航控制器中,然后将导航控制器指定为Windows 根视图控制器。
let status = UserDefaults.standard.bool(forKey: UserDefaultKeys.status)
var rootVC : UIViewController?
if(status == true){
rootVC = UIStoryboard(name: AppStoryBoardName.main, bundle: nil).instantiateViewController(withIdentifier: TabBarViewController.className) as? TabBarViewController
} else{
rootVC = UIStoryboard(name: AppStoryBoardName.main, bundle: nil).instantiateViewController(withIdentifier: LoginViewController.className) as? LoginViewController
}
guard let root = rootVC else {return }
// Embedding the specific controller in navigation controller and assigning navigation controller as windows root.
let nav = UINavigationController(rootViewController: root)
window?.rootViewController = nav
In that case you will have navigation controller in LoginViewController
and the login button action works perfect ie在这种情况下,您将在
LoginViewController
拥有导航控制器,并且登录按钮操作完美无缺,即
self.navigationController?.pushViewController(controller, animated: true)
But on logout you simply assign your LoginViewController
as the windows root ie但是在注销时,您只需将您的
LoginViewController
分配为 Windows 根,即
appUserDefaults.set(false, forKey: UserDefaultKeys.status) appUserDefaults.synchronize()
let loginVC = self.storyboard?.instantiateViewController(withIdentifier: LoginViewController.className) as? LoginViewController
let window = UIApplication.shared.windows.first
// loginVC is not embedded in Navigation Controller
window?.rootViewController = loginVC
After the above transition the LoginViewController
will not navigation controller so the optional chaining of pushingViewController in login button action will fails ie在上述转换之后,
LoginViewController
将不会导航控制器,因此在登录按钮操作中 pushViewController 的可选链接将失败,即
self.navigationController?.pushViewController(controller, animated: true)
Keep it consistent by embedding the LoginViewController
in Navigation Controller even on logout, update your logout action code to :通过在 Navigation Controller 中嵌入
LoginViewController
来保持一致,即使在注销时,将注销操作代码更新为:
appUserDefaults.set(false, forKey: UserDefaultKeys.status) appUserDefaults.synchronize()
let loginVC = self.storyboard?.instantiateViewController(withIdentifier: LoginViewController.className) as? LoginViewController
let window = UIApplication.shared.windows.first
// Embed loginVC in Navigation Controller and assign the Navigation Controller as windows root
let nav = UINavigationController(rootViewController: loginVC)
window?.rootViewController = nav
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