ios 在 Swift 中从 AppDelegate 获取 ViewController 的实例
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Get Instance Of ViewController From AppDelegate In Swift
提问by PretzelJesus
I am trying to load a specific ViewController from the app delegate in swift when a user clicks a UILocalNotification. I have figured out that this is called in this function:
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!)
But when I try and access one of the open ViewControllers I think it's returning null because my application is crashing. Here is what I am trying:
但是当我尝试访问其中一个打开的 ViewControllers 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()
It's crashing on the popToViewController line.
它在 popToViewController 行上崩溃了。
回答by fulvio
You could try:
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)
Swift 3:
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)
