显示几秒钟的视图（从NavController自定义推送）

Question

我开始使用Master-Detail Application。现在我尝试添加一个自定义View（带有简单Label的默认UIViewController），它将显示几秒钟（如加载视图），然后才能访问detail / master视图。
我现在的问题是，如果我将我的ViewController添加到AppDelegate并从NavigationController推送到它，我会得到一个空视图。
见这里：

我没有改变任何东西，只是在appdelegate中添加了一行代码：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    let splitViewController = self.window!.rootViewController as UISplitViewController
    let navigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as UINavigationController
    navigationController.topViewController.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem()
    splitViewController.delegate = self

    let masterNavigationController = splitViewController.viewControllers[0] as UINavigationController
    let controller = masterNavigationController.topViewController as MasterViewController
    controller.managedObjectContext = self.managedObjectContext

    // +++ Custom ViewController is to be displayed from here +++

    navigationController.pushViewController(ViewController(), animated: true)

    return true
}

我不知道问题出在哪里...

Answer 1

在代码中使用此行

navigationController.pushViewController(ViewController(), animated: true)

你正在实例化一个新的空视图控制器，你可能不是你想要的。

获取对故事板的引用（即来自masterviewcontroller）以创建视图控制器并将其推送到导航堆栈。例如：

if let myVC = controller.storyboard!.instantiateViewControllerWithIdentifier(...) {
    navigationController.pushViewController(myVC, animated: true)
}