didReceiveRemoteNotification 在 运行 时来自任何地方的 presentViewController

didReceiveRemoteNotification presentViewController from anywhere when running

我正在尝试在收到远程通知时显示 UIViewController

我的代码可以正常工作,但是当应用程序是 运行 并且用户位于第一个 screen/navigation 堆栈以外的任何堆栈时,UIViewController 不会出现。

有人可以帮忙吗?注意我想在 UIViewController 出现时保留导航栏

当我尝试在其他地方显示 'UIViewController' 时收到此警告

警告:试图展示其视图不在 window 层次结构中!

提前致谢

这是我的 didReceiveRemoteNotification:

代码
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {

  var payload = userInfo
  let requestID = payload["requestID"] as! String


  let rootViewController = self.window!.rootViewController as! UINavigationController

  let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
  let vc : RequestViewController = storyboard.instantiateViewControllerWithIdentifier("RequestViewController") as! RequestViewController
    vc.requestID = requestID

  let navigationController = UINavigationController(rootViewController: vc)

  rootViewController.presentViewController(navigationController, animated: true, completion: nil)

}

通过更改修复了它:

rootViewController.presentViewController(navigationController, animated: true, completion: nil)

至:

rootViewController.visibleViewController!.presentViewController(navigationController, animated: false, completion: nil)