ios - 在Swift中从AppDelegate获取ViewController的实例

当用户单击UILocalNotification时，我试图从应用程序委托(delegate)快速加载特定的ViewController。我已经知道这是在此函数中调用的:

func application(application: UIApplication!, didReceiveLocalNotification notification: UILocalNotification!)

但是，当我尝试访问打开的ViewController之一时，我认为它返回null，因为我的应用程序崩溃了。这是我正在尝试的:

var rootViewController = self.window!.rootViewController
var storyBoard = rootViewController.storyboard
var setViewController = storyBoard.instantiateViewControllerWithIdentifier("CurrentShows") as ViewController_CurrentShows

rootViewController.navigationController.popToViewController(setViewController, animated: false)
setViewController.reloadData()

在popToViewController行上崩溃了。

最佳答案

您可以尝试:

let rootViewController = self.window!.rootViewController
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let setViewController = mainStoryboard.instantiateViewControllerWithIdentifier("CurrentShows") as! DetailViewController
rootViewController?.navigationController?.popToViewController(setViewController, animated: false)

Swift 3:

let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let controller = mainStoryboard.instantiateViewController(withIdentifier: "viewController")
self.present(viewController, animated: true, completion: nil)