處理RootViewController時注冊按鈕不起作用？

我正在使用 Storyboard 構建一個 iOS 應用程式。根視圖控制器是主視圖控制器。我正在創建登錄/注銷程序，它大部分作業正常，但我遇到了一些問題。我需要知道設定這一切的最佳方式。當我點擊登錄和注銷時，應用程式運行良好，但是當我點擊注冊時，我也創建了一個導航控制器。我只是不確定目前最好的方法是什么。

我給你我的詳細資訊

這是我用于管理視圖的切換器類

import UIKit

class Switcher {

static func updateRootViewController() {

    let status = UserDefaults.standard.bool(forKey: Constants.kUserDefaults.isSignIn)
    var rootViewController : UIViewController?

    #if DEBUG
    print(status)
    #endif

    if (status == true) {
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let mainTabBarController = mainStoryBoard.instantiateViewController(withIdentifier: Constants.StoryboardID.homeViewController) as! HomeViewController
        rootViewController = mainTabBarController
    }  else {
    
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let signInViewController = mainStoryBoard.instantiateViewController(withIdentifier: Constants.StoryboardID.signInViewController) as! SignInViewController
        rootViewController = signInViewController
    }

    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window?.rootViewController = rootViewController

   }

   }

我的應用代表

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?
let storyBoard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    IQKeyboardManager.shared.enable = true
    Switcher.updateRootViewController()
    return true
}

注冊按鈕

@IBAction func signUpBtnTapped(_ sender: UIButton) {
    let storyBoard = UIStoryboard(name: "Main", bundle: nil)
    guard let signUpVC = storyBoard.instantiateViewController(withIdentifier: "RegistrationViewController") as? RegistrationViewController else {
        return
    }
    print("Register Tapped")
    self.navigationController?.pushViewController(signUpVC, animated: true)
}

uj5u.com熱心網友回復：

問題是您的 rootViewController 沒有設定 UINavigationViewController，這兩個 Viewcontroller 都沒有。您需要做的不是像這樣實體化：

    if (status == true) {
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let mainTabBarController = mainStoryBoard.instantiateViewController(withIdentifier: Constants.StoryboardID.homeViewController) as! HomeViewController
        rootViewController = mainTabBarController
    }  else {

        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let signInViewController = mainStoryBoard.instantiateViewController(withIdentifier: Constants.StoryboardID.signInViewController) as! SignInViewController
        rootViewController = signInViewController
}

您需要實體化一個 UINavigationController ，它的根如下所示

        if (status == true) {
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let mainTabBarController = mainStoryBoard.instantiateViewController(withIdentifier: Constants.StoryboardID.homeViewController) as! HomeViewController
        let navigationController = UINavigationController(rootViewController: mainTabBarController)
        rootViewController = navigationController
    }  else {

        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let signInViewController = mainStoryBoard.instantiateViewController(withIdentifier: Constants.StoryboardID.signInViewController) as! SignInViewController
        let navigationController = UINavigationController(rootViewController: signInViewController)

        rootViewController = navigationController
    }

現在您 self.navigationController?.pushViewController(signUpVC, animated: true)將作業，因為“navigationController”存在。

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