swift - appdelegateでuiviewcontrollerメソッドを呼び出す方法

Question

webView変数はnilです。

致命的なエラー：予期せずシングルトンオブジェクトを使用する方法をオプション値

をアンラップしながら、nilを見つけますか？

class PushHandler: NSObject, UAPushNotificationDelegate { 

    func receivedNotificationResponse(_ notificationResponse: UANotificationResponse, completionHandler: @escaping() -> Swift.Void) { 
     print("The user selected the following action identifier:%@", notificationResponse.actionIdentifier); 

     if let targetUrl = notificationResponse.notificationContent.notificationInfo["url"] { 
      let viewController:MCKWebViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "MCKWebViewController") as! MCKWebViewController 
      // .instantiatViewControllerWithIdentifier() returns AnyObject! this must be downcast to utilize it 

      self.window?.rootViewController?.present(viewController, animated: false, completion: nil) 
      viewController.goURL(targetUrl as! String) 
     } 
     completionHandler() 
} 



class MCKWebViewController: UIViewController { 

    @IBOutlet weak var webView: UIWebView! 

    func goURL(_ targetUrl: String) { 
     let url = URL(string: targetUrl) 
     let urlRequest = URLRequest(url: url!) 
     webView.loadRequest(urlRequest) 
    } 
} 

Answer 1

instantiateViewController(withIdentifier:)方法