RootViewController没有从AppDelegate设置？

Question

我正在使用一个已归档的对象来确定哪个视图需要在启动时加载（或者只是从睡眠中打开应用程序），并使用布尔标志。虽然我的if语句正确评估，但其中的代码却没有。

这是didFinishLaunchingWithOptions中的内容：

// Register permission to throw notifications
        application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: .Alert | .Badge | .Sound, categories: nil))

        var so = StatusOverseer.sharedOverseer

        println("User did finish application: \(so.userDidFinishApplication)")
        println("Banks Did Respond: \(so.banksDidRespond)")
        println("user did accept terms: \(so.userDidAcceptTerms)")

        // Decide whether or not to present the waiting view
        if so.userDidFinishApplication && !so.banksDidRespond {
            let sb = UIStoryboard(name: "Main", bundle: nil)
            let vc = sb.instantiateViewControllerWithIdentifier("submitWaiting") as! UIViewController

            UIApplication.sharedApplication().keyWindow?.rootViewController = vc
        }
        else if so.banksDidRespond {
            println("bip")
            let sb = UIStoryboard(name: "Main", bundle: nil)

            if so.notificationWasGood {
                let vc = sb.instantiateViewControllerWithIdentifier("approved") as! UIViewController
                UIApplication.sharedApplication().keyWindow?.rootViewController = vc
            }
            else {
                let vc = sb.instantiateViewControllerWithIdentifier("notApproved") as! UIViewController
                UIApplication.sharedApplication().keyWindow?.rootViewController = vc
            }
        }
        else if so.userDidAcceptTerms {
            println("Did Run")
            let sb = UIStoryboard(name: "Main", bundle: nil)
            let vc = sb.instantiateViewControllerWithIdentifier("LicenseViewNav") as! UIViewController

            UIApplication.sharedApplication().keyWindow?.rootViewController = vc
        }

这是控制台输出：

Recalling Status Overseer from Archive...
User did finish application: false
Banks Did Respond: false
user did accept terms: true
Did Run

请注意底部else if按原样运行，但我在启动时看到的视图不是行中声明的LicenseViewNav：

let vc = sb.instantiateViewControllerWithIdentifier("LicenseViewNav") as! UIViewController    
UIApplication.sharedApplication().keyWindow?.rootViewController = vc

如果有人知道发生了什么，那就太好了。谢谢！

编辑：当前问题似乎是keyWindow评估为nil

Answer 1

在swift中设置根视图控制器的最佳方法

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

     var rootView: MyRootViewController = MyRootViewController()

     if let window = self.window{
            window.rootViewController = rootView
     }

     return true
}

Answer 2

通过强制keyWindow初始化，这是一个简单的修复。我只是把这一行放在我的if语句之上，它现在有效。

window?.makeKeyAndVisible()