如何将值从单独的类传递到 AppDelegate？

Question

我的 SignInViewController.swift 中有一个 class:

class CredentialState: NSObject {
    static let sharedInstance = CredentialState()
    var signedIn = false
    var displayName: String?
    var photoUrl: NSURL?
}

我想使用变量 signedIn 通过 if-else 语句对 AppDelegate 中的用户进行身份验证。目前，我有办法将 viewcontroller 设置为 CustomTabBarController（自定义编程制作）或 SignInViewController（制作故事板）。 if 语句基本上会说如果值为 false，则将控制器设置为登录屏幕，如果为 true，则转到标签栏屏幕。

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    FIRApp.configure()

    // Override point for customization after application launch.
    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    window?.makeKeyAndVisible()

    // Main view controller is inside of customtabbarcontroller, which gives a tab overlay
//        window?.rootViewController = CustomTabBarController()

    // Sets the main view to a storyboard element, such as SignInVC
    let storyboard = UIStoryboard(name: "SignIn", bundle: nil)
    let loginVC = storyboard.instantiateViewControllerWithIdentifier("SignInVC") as! SignInViewController
    self.window?.rootViewController = loginVC

    return true
}

Answer 1

如果我理解正确的话：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    FIRApp.configure()

    // Override point for customization after application launch.
    window = UIWindow(frame: UIScreen.mainScreen().bounds)

    // check login state
    if CredentialState.sharedInstance.signedIn {
        // Main view controller is inside of customtabbarcontroller, which gives a tab overlay
        window?.rootViewController = CustomTabBarController()
    } else {
        // Sets the main view to a storyboard element, such as SignInVC
        let storyboard = UIStoryboard(name: "SignIn", bundle: nil)
        let loginVC = storyboard.instantiateViewControllerWithIdentifier("SignInVC") as! SignInViewController
        window?.rootViewController = loginVC
    }

    window?.makeKeyAndVisible()
    return true
}

Answer 2

我不太确定你在问什么，但我会尽力回答。基本上你需要做的只是简单地将这段代码放在你的 CredentialState class:

之上

credentialState : CredentialState = CredentialState()

通过这种方式，您可以从 AppDelegate 更改或检查您的 signedIn 变量。因此，只需在 AppDelegate 文件中，您就可以：

if(credentialState.signedIn == true) ...

希望我能够回答你的问题

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