Question

我的SignInViewController.swift中有一个类：

button.setImage(UIImage(named: "enter.png"), forState: [.Selected, .Highlighted])

我想使用变量signedIn来使用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）或 SignInViewController（storyboard made）。 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，如果是，则转到标签栏屏幕。

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

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，但我会试着回答这个问题。基本上你需要做的只是在CredentialState类上面放置这段代码：

credentialState : CredentialState = CredentialState()

通过这种方式，您可以从AppDelegate更改或检查signedIn变量。所以只需在AppDelegate文件中即可：

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

希望我能回答你的问题

如何将值从单独的类传递到AppDelegate？

2 个答案: