Ios 警告：尝试显示其视图不在窗口层次结构中的ViewController

在我的一个应用程序中，我正在通过

应用程序didReceiveLocalNotification

方法调用viewController。页面加载成功，但会显示以下警告：

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

---

如果应用程序类型id为UINavigationController，则可以使用

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

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

希望这对你有帮助。

---

祝你一切顺利

这可能是因为当显示VC时，viewcontroller的视图当前未加载到窗口层次结构中

-(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];
}

---

根据我的假设，我感觉您正试图在将

self.viewController

附加或放置到窗口层次结构之前，从

self.viewController

显示

myView

。所以只要确保在

self.viewController

出现/附加到窗口后显示

myView

---

最后，我用以下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];
}

---

我遇到了类似的问题，当应用程序进入前台时，我正在从AppDelegate.m中调用presentViewController：

- (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];
        }
    }
}

---

这并没有问题，因为它在显示登录视图控制器之前先解除视图控制器（无论推到视图控制器上的是什么视图）。如果没有，我可以直接显示登录视图控制器。

Put

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

变成一个函数

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

然后这样称呼它：

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

问题已被描述，为什么

会执行选择器：withObject:afterDelay

修复此问题？因为直到运行循环的下一次运行时才会调用选择器。因此，事情有时间解决，您只需跳过一个运行循环。

边缘案例：

---

有些人可能会通过Google发现这一点，值得指出的是，如果您将一个视图作为根视图控制器加载，而该视图在故事板中没有标记为初始视图（另一个视图是），然后在顶部加载另一个视图，则有时会出现此错误。例如，在从App委托的

applicationdifinish…

方法中以编程方式加载的登录视图中。只需将初始视图（拖动故事板中的箭头）更改为适合层次结构的视图。深奥、模糊，但值得指出

对于

Swift 2.0

我使用了一个覆盖

viewdideappear

，包括：

让vc=self.storyboard？.instanceeviewcontrollerwhithidentifier（“第二”）为！第二视图控制器

self.presentViewController(vc, animated: true, completion: nil)

---

其中“Second”是identity inspector中Second ViewController的情节提要ID。

当您调用didReceiveLocalNotification时？@Bhargavi:这是一个在收到本地通知时调用的代理服务器。感谢您的建议。我试过这个。第一次它工作正常，如果通知再次出现，它将显示相同的警告…：（是的x2：将我的presentView移动到ViewDidAspect解决了我的问题。

I have used Navigation Controller and on which i have used a
ModalViewController to present a Popup(Present over current context). 
From this Popup i am opening a ViewController Modally which 
caused the Warning. So to resolve i did below change:

[self.presentedViewController performSegueWithIdentifier:@"PresentScreenSegueId" sender:sender];

I have used Navigation Controller and on which i have used a
ModalViewController to present a Popup(Present over current context). 
From this Popup i am opening a ViewController Modally which 
caused the Warning. So to resolve i did below change:

[self.presentedViewController performSegueWithIdentifier:@"PresentScreenSegueId" sender:sender];