AppDelegate:
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window!.backgroundColor = UIColor.whiteColor()
self.window!.makeKeyAndVisible()
self.window!.rootViewController = CounterViewController()
application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes:
UIUserNotificationType.Sound | UIUserNotificationType.Alert |
UIUserNotificationType.Badge, categories: nil
))
ViewController:
override func viewWillLayoutSubviews(){ super.viewWillLayoutSubviews()
...... }
原文：http://www.cnblogs.com/chuny/p/4108151.html