试图弹出一个不存在的视图控制器 swift 5.1 Xcode iOS [英] Tried to pop to a view controller that doesn't exist swift 5.1 Xcode iOS
本文介绍了试图弹出一个不存在的视图控制器 swift 5.1 Xcode iOS的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发应用程序.当我点击注销按钮时，它向我显示了这个错误试图弹出一个不存在的视图控制器.
i'm Working on App. when i'm clicking on logout button its shows me this error Tried to pop to a view controller that doesn't exist.
这是我的 StoryBoard 屏幕
这是我的 AppDelegate 代码
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
if #available(iOS 13.0, *)
{
//do nothing we will have a code in SceneceDelegate for this
}
else {
makeRoot()
}
FirebaseApp.configure()
return true
}
func makeRoot()
{
let defaults = UserDefaults.standard
if defaults.bool(forKey: "isLogin") == true
{
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let VC = mainStoryboard.instantiateViewController(withIdentifier: "RootTabBarC") as! RootTabBarC
let centerNavVC = UINavigationController(rootViewController: VC)
//centerNavVC.isNavigationBarHidden = true
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = centerNavVC
self.window?.makeKeyAndVisible()
}
else
{
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let VC = mainStoryboard.instantiateViewController(withIdentifier: "LoginSignUpVC") as! LoginSignUpVC
let centerNavVC = UINavigationController(rootViewController: VC)
//centerNavVC.isNavigationBarHidden = true
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = centerNavVC
self.window?.makeKeyAndVisible()
}
}
这是我的 SceneDelagate 代码
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
guard let windowScene = (scene as? UIWindowScene) else { return }
let defaults = UserDefaults.standard
if defaults.bool(forKey: "isLogin") == true
{
//guard let windowScene = (scene as? UIWindowScene) else { return }
self.window = UIWindow(windowScene: windowScene)
//self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let rootVC = storyboard.instantiateViewController(identifier: "RootTabBarC") as? RootTabBarC else {
print("ViewController not found")
return
}
let navVc = UINavigationController(rootViewController: rootVC)
//navVc.isNavigationBarHidden = true
self.window?.rootViewController = navVc
self.window?.makeKeyAndVisible()
}
else
{
self.window = UIWindow(windowScene: windowScene)
//self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let rootVC = storyboard.instantiateViewController(identifier: "LoginSignUpVC") as? LoginSignUpVC else {
print("ViewController not found")
return
}
let navVc = UINavigationController(rootViewController: rootVC)
//navVc.isNavigationBarHidden = true
self.window?.rootViewController = navVc
self.window?.makeKeyAndVisible()
}
}
这是我的 LoginSignUpVc 代码
import UIKit
class LoginSignUpVC: UIViewController {
@IBOutlet weak var lblTitle: UILabel!
@IBOutlet weak var btnLogin: UIButton!
@IBOutlet weak var lblDontHaveAccount: UILabel!
@IBOutlet weak var btnSignUp: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
setupUI()
}
override func viewWillAppear(_ animated: Bool) {
navigationController?.setNavigationBarHidden(false, animated: true)
}
override var prefersStatusBarHidden: Bool
{
return true
}
func setupUI()
{
letterSpacing()
buttonSetUp()
}
@IBAction func onClickLogin(_ sender: Any)
{
}
@IBAction func onClickSignUp(_ sender: Any)
{
}
}
这是我的 LoginVc 代码
import UIKit
import FirebaseAuth
class LoginVC: UIViewController {
@IBOutlet weak var lblTitle: UILabel!
@IBOutlet weak var lblSubTitle: UILabel!
@IBOutlet weak var viewContainerEmail: UIView!
@IBOutlet weak var txtEmail: UITextField!
@IBOutlet weak var viewContainerPassword: UIView!
@IBOutlet weak var txtPassword: UITextField!
@IBOutlet weak var btnLogin: SSSpinnerButton!
@IBOutlet weak var btnForgotPassword: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.layer.frame.origin.y = 22
setupUI()
}
override func viewWillDisappear(_ animated: Bool) {
btnLogin.stopAnimate(complete: nil)
}
override var prefersStatusBarHidden: Bool
{
return true
}
func setupUI()
{
letterSpacing()
textFieldSetUp()
buttonSetUp()
}
@IBAction func onClickLogin(_ sender: Any)
{
let email = Validation.shareValidator.isValidEmail(email: txtEmail.text, view: viewContainerEmail)
let password = Validation.shareValidator.isValidPassword(password: txtPassword.text, view: viewContainerPassword)
if email != "success"
{
CustomAlert.shareAlert.alertSetUp(title: "Email Field", subTitle: email, boldTitle: "Invalid Email")
}
else if password != "success"
{
CustomAlert.shareAlert.alertSetUp(title: "Password Field", subTitle: password, boldTitle: "Invalid Password")
}
else
{
Auth.auth().signIn(withEmail: txtEmail.text!, password: txtPassword.text!) { (result, error) in
if error != nil
{
CustomAlert.shareAlert.alertSetUp(title: "Login Error", subTitle: error!.localizedDescription, boldTitle: "Login Error")
}
else
{
self.btnLogin.startAnimate(spinnerType: SpinnerType.circleStrokeSpin, spinnercolor: UIColor.white, spinnerSize: 20, complete: {
self.btnLogin.backgroundColor = UIColor.green
let defaults = UserDefaults.standard
defaults.set(true, forKey: "isLogin")
defaults.set(result?.user.uid, forKey: "uid")
defaults.set(self.txtEmail.text!, forKey: "email")
//let st = UIStoryboard(name: "Main", bundle: nil)
let vc = self.storyboard?.instantiateViewController(withIdentifier: "RootTabBarC") as! RootTabBarC
self.navigationController?.pushViewController(vc, animated: true)
})
}
}
}
}
@IBAction func onClickBack(_ sender: Any)
{
navigationController?.popViewController(animated: true)
}
}
这是我的 ProfileVC 代码
import UIKit
import FirebaseAuth
import FirebaseDatabase
import Kingfisher
class ProfileVC: UIViewController {
@IBOutlet weak var viewImageContainer: UIView!
@IBOutlet weak var imgProfile: UIImageView!
@IBOutlet weak var lblName: UILabel!
@IBOutlet weak var lblDishExpert: UILabel!
@IBOutlet weak var lblBio: UILabel!
@IBOutlet weak var imgEmailIcon: UIImageView!
@IBOutlet weak var imgPhoneIcon: UIImageView!
@IBOutlet weak var lblEmail: UILabel!
@IBOutlet weak var lblPhone: UILabel!
var userDataDict = [String]()
override func viewDidLoad() {
super.viewDidLoad()
setUpUI()
showUserData()
}
@IBAction func onClickLogOut(_ sender: Any)
{
do
{
try Auth.auth().signOut()
UserDefaults.standard.set(false, forKey: "isLogin")
UserDefaults.standard.removeObject(forKey: "uid")
UserDefaults.standard.removeObject(forKey: "email")
UserDefaults.standard.synchronize()
}
catch let err
{
print(err.localizedDescription)
}
let vc = storyboard?.instantiateViewController(identifier: "LoginSignUpVC") as? LoginSignUpVC
navigationController?.popToViewController(vc!, animated: true)
}
}
我也在尝试 self.parent?.navigationController?.PopToRootViewController(animate:true)但不能正常工作.感谢您的帮助.
i'm also try self.parent?.navigationController?.PopToRootViewController(animate:true)
but is not working propely.
thank for your help.
推荐答案
Vasucd 是对的，先把 LoginSinUpVC 放在 NavigationController 的 viewControllers 中
Vasucd is right, put LoginSinUpVC in NavigationController’s viewControllers first
——————编辑——————-
——————Edited—————-
如错误所示，这是因为您初始化了一个在 NavigationController 的 viewControllers 中不存在的新 viewController
As error indicates, this is because you init a new viewController that dose not exist in NavigationController's viewControllers
let vc = storyboard?.instantiateViewController(identifier: "LoginSignUpVC") as? LoginSignUpVC
解决问题，尝试在navigationController的viewControllers中找到LoginSignUpVC
to solve the problem, try to find LoginSignUpVC in navigationController's viewControllers
for vc in navigationController.viewControllers {
if let loginSignUpVC = vc as? LoginSignUpVC {
navigationController?.popToViewController(loginSignUpVC, animated: true)
}
}
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