ios - 警告 : attempt to present ViewController whose view is not in the window hierarchy

Question

在我的一个应用程序中，我从 application didReceiveLocalNotification 方法调用 viewController。页面加载成功，但显示警告:

 Warning: Attempt to present <blankPageViewController: 0x1fda5190> on 
 <ViewController: 0x1fd85330> whose view is not in the window hierarchy!

我的代码如下:

 -(void) application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {

    blankPageViewController *myView = [[blankPageViewController alloc] 
               initWithNibName:@"blankPageViewController" bundle: nil];
    myView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.viewController presentViewController:myView animated:NO completion:nil];  
}

Answer 1

最后我用下面的代码解决了这个问题。

-(void) application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
       self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
       self.blankviewController = [[blankPageViewController alloc] initWithNibName:@"blankPageViewController" bundle:nil];
       self.window.rootViewController = self.blankviewController;
       [self.window makeKeyAndVisible];
}