ios - 如何使用 Swift、iOS 7 设置 rootViewController

Question

我想在应用委托(delegate)中设置 rootViewController ..

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

     var rootView: MyRootViewController = MyRootViewController()
     //Code to set this viewController as the root view??


     return true

}

Answer 1

如果您正在使用 Storyboard 并想以编程方式设置您的 rootViewController，请首先确保 ViewController 在 Identity Inspector 中具有 Storyboard ID。然后在 AppDelegate 中执行以下操作:

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

   // get your storyboard
   let storyboard = UIStoryboard(name: "Main", bundle: nil)

   // instantiate your desired ViewController
   let rootController = storyboard.instantiateViewControllerWithIdentifier("MyViewController") as! UIViewController

   // Because self.window is an optional you should check it's value first and assign your rootViewController
   if let window = self.window {
      window.rootViewController = rootController
   }

   return true
}