Warning: attempt to present ViewController whose view is not in the window hierarchy

Question

In one of my apps, I'm calling a viewController from the application didReceiveLocalNotification method. The page loads successfully, but it shows a warning as :

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

My code is as follows :

 -(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];  
}

Solution 1

Finally I solved that issue with the following code.

-(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];
}

Solution 2

Put

[self.viewController presentViewController:myView animated:NO completion:nil];  

into a function e.g.

- (void)yourNewFunction
{
    [self.viewController presentViewController:myView animated:NO completion:nil];
}

and then call it like this:

[self performSelector:@selector(yourNewFunction) withObject:nil afterDelay:0.0];

The problem got described here and why does this performSelector:withObject:afterDelay fix this problem? Because the selector will not be called until the next run of the run loop. So things have time to settle down and you will just skip one run loop.

Solution 3

As per my assumption, I am feeling like you are trying to present myView from self.viewController before self.viewController is attached or placed in window hierarchy. So just make sure to present myView after self.viewController gets appear/attached to window.

Why can't a modal view controller present another in viewDidLoad?

Solution 4

it could be because the viewcontroller's view is not currently loaded in window hierarchy when VC is presented...

-(void) application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
    UINavigationController *navigationController = (UINavigationController*) self.window.rootViewController;
    rootViewController = [[navigationController viewControllers] objectAtIndex:0];
    blankPageViewController *myView = [[blankPageViewController alloc] initWithNibName:@"blankPageViewController" bundle: nil];
    [rootViewController presentModalViewController:myView animated:YES];
}

Solution 5

I was having a similar issue, I was calling the presentViewController from within my AppDelegate.m when the application entered the foreground:

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    NSDate * lastActive = [[NSUserDefaults standardUserDefaults] objectForKey:@"lastActive"];

    double interval = [[NSDate date] timeIntervalSinceDate:lastActive];

    NSLog(@"Time Interval: %f", interval);

    if (interval > 900) { // interval is in seconds, so 900 seconds = 15 mins
        Login *pres = [self.window.rootViewController.storyboard instantiateViewControllerWithIdentifier:@"login"];

        UINavigationController *navi = ((UINavigationController*)self.window.rootViewController);
        if (navi.presentedViewController) {
            [navi dismissViewControllerAnimated:YES completion:^{
                [navi presentViewController:pres animated:NO completion:nil];
            }];
        } else {
            [navi presentViewController:pres animated:NO completion:nil];
        }
    }
}

---

This worked no problem as it dismisses the view controller first (regardless of what views have been pushed onto it) if it is present before presenting the Login view controller. If not then I can just present the Login view controller straight away.

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Comments

[Vinoy Alexander]

Thanks for the advice. I've tried this. It worked fine first time,if the notification appears again, it is showing the same warning...:(

[xhinoda]

Yep x2: moving my presentView to viewDidAppear solved my problem.