在 Swift 中从 AppDelegate 获取 ViewController 的实例

Question

当用户单击 UILocalNotification 时，我试图从应用程序委托中快速加载特定的 ViewController。我发现这是在这个函数中调用的：

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，因为我的应用程序正在崩溃。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()

它在 popToViewController 行上崩溃了。

Answer 1

你可以试试：

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)

斯威夫特 3：

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