userId 来 appdelegate 还是不去 Mainviewcontroller 为啥？迅速

Posted 2023-02-24

【中文标题】userId 来 appdelegate 还是不去 Mainviewcontroller 为啥？迅速

【英文标题】：userId coming to appdelegate still not going to Mainviewcontroller why? in swiftuserId 来 appdelegate 还是不去 Mainviewcontroller 为什么？迅速

【发布时间】：2020-06-05 10:44:52

【问题描述】：

NavigationController是isinitial viewcontroller in storyboard，NavigationController嵌入到LoginViewcontroller

在项目故事板导航中将如下所示

NavigationController->LoginViewcontroller-> RegistrationViewcontroller -> MainViewcontroller

在 PhNUmber 成功注册后，我得到了 userId，我存储在 KeychainWrapper 中

在 RegistrationViewcontroller 中： 我正在存储 userId，如下所示：

 let userID: String=jsonObj?["userId"] as? String ?? "" 
 KeychainWrapper.standard.set(userID, forKey: "USERID")

我正在 appdelegate 中检查，如下所示进入 Mainviewcontroller：

class AppDelegate: UIResponder, UIApplicationDelegate 

var window: UIWindow?
var savedUserId: String?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 

    savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
    print("appdelegate userid \(savedUserId)")
    if savedUserId != nil
        print("saveuserid \(savedUserId)")
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
    
    return true

这里savedUserId来了，为什么我不去MainViewcontroller，一直出现LoginViewcontroller

【参考方案1】：

您需要初始化window。在上面设置rootViewController：

class AppDelegate: UIResponder, UIApplicationDelegate 

    var window: UIWindow?
    var savedUserId: String?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 
        savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
        print("appdelegate userid \(savedUserId)")
        if savedUserId != nil
            print("saveuserid \(savedUserId)")
            let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
            window = UIWindow()
            window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
        
        return true
    

更新：如果你使用SceneDelegate，你应该使用这个：

class SceneDelegate: UIResponder, UIWindowSceneDelegate 

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) 
        guard let windowScene = scene as? UIWindowScene else  return 
        window = UIWindow(windowScene: windowScene)print("appdelegate userid \(savedUserId)")
        if savedUserId != nil
            print("saveuserid \(savedUserId)")
            let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
            window = UIWindow()
            window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
        
    

【讨论】：

如果我像这样var window = UIWindow() 给出错误：“窗口”类型与协议“UIApplicationDelegate”要求的可选性不同

var 窗口：UIWindow?并在didFinishLaunchingWithOptions in window = UIWindow() window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")............然后还会出现登录视图控制器

我怀疑您是否按照我的预期提供了答案。所以我已经更新了我对你提供的整个代码的答案。

两个用户 ID 都来自 appdelegate userid Optional("415c6073d45a481f991cb81b4c81bf81") saveuserid Optional("415c6073d45a481f991cb81b4c81bf81")。但是 loginviewcontroller 来了

您能检查一下mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController") != nil 是否正在获取true。

【参考方案2】：

试试这个扩展

  // add this function in your AppDelegate

  func makeRootVC(_ storyBoardName : String, _ vcName : String) 
        let vc = UIStoryboard(name: storyBoardName, bundle: Bundle.main).instantiateViewController(withIdentifier: vcName)
        let nav = UINavigationController(rootViewController: vc)
        nav.navigationBar.isHidden = true
        self.window?.rootViewController = nav
        let options: UIView.AnimationOptions = .transitionCrossDissolve
        let duration: TimeInterval = 0.6
        UIView.transition(with: self.window!, duration: duration, options: options, animations: , completion: nil)
    

然后在你的didFinishLaunchingWithOptions中使用它

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 

    savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
    print("appdelegate userid \(savedUserId)")
    if savedUserId != nil
        print("saveuserid \(savedUserId)")
        self.makeRootVC("Main","MainViewController")
    
    return true

【讨论】：

UIView.transition（带有：self.window！，持续时间：持续时间，选项：选项，动画：，完成：无）。错误：线程 1：致命错误：在展开可选值时意外发现 nil

@iosApp 你也在用SceneDelegate吗？

是的 SceneDelegate 存在，但在同一行同样的错误

@iOSApp 参考这里设置 rootViewController 从 sceneDelegate ***.com/questions/58188296/…

【参考方案3】：

检查window是否为nil并在AppDelegate中设置rootViewController后添加makeKeyAndVisible()

if(window == nil)
    self.window = UIWindow(frame:UIScreen.main.bounds)

if savedUserId != nil
    print("saveuserid \(savedUserId)")
    let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
    window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
    self.window?.makeKeyAndVisible()

【讨论】：

如果我在 if(window == nil) 中打印用户 ID 两个都打印但不去 mainviewcontroller