如果屏幕方向已更改,AppDelegate应调用该方法

Question

我有一个popover,我从那里提出我TabBarItem为什么要进去AppDelegate,但popover如果屏幕方向已经改变,我需要在新的地方重新显示.在我的应用程序的其他地方我只是使用该didRotateFromInterfaceOrientation方法,但它没有调用AppDelegate.我怎么解决这个问题？

我通过以下代码呈现一个popover:

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        if (viewController == [self.objTabBarController.viewControllers objectAtIndex:2])
        {
            if (self.settingsPopover == nil) {
                UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main - iPad" bundle: nil];
                SettingsViewController *settingsController = [mainStoryboard instantiateViewControllerWithIdentifier: @"SettingsPopover"];

                UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:settingsController];

                self.settingsPopover = [[UIPopoverController alloc] initWithContentViewController:navigationController];

                CGSize tabBarSize = self.objTabBarController.tabBar.frame.size;
                CGPoint center = [self.window.rootViewController.view convertPoint:self.objTabBarController.tabBar.center fromView:self.objTabBarController.tabBar.superview];
                center.x += 105;
                center.y -= tabBarSize.height / 2;
                CGRect rect = {center, CGSizeZero};

                [self.settingsPopover presentPopoverFromRect:rect inView:self.window.rootViewController.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
            } else {
                [self.settingsPopover dismissPopoverAnimated:NO];
                self.settingsPopover = nil;
            }

            return NO;
        }
    }
    return YES;
}

Answer 1

您可以注册Notification如下:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(handleDidChangeStatusBarOrientationNotification:) 
                                             name:UIApplicationDidChangeStatusBarOrientationNotification 
                                           object:nil];

然后,实现它AppDelegate:

- (void)handleDidChangeStatusBarOrientationNotification:(NSNotification *)notification;
{
  NSLog(@"The orientation changed to %@", [notification.userInfo objectForKey: UIApplicationStatusBarOrientationUserInfoKey]);
}

请享用.:)