Web浏览器不在Windows Phone 8上加载页面内容(Webbrowser not loading page content on Windows Phone 8)

 我会注册UIPopover实例来收听一些通知。 
 
[[NSNotificationCenter defaultCenter] addObserver:_myPopOver 
                                         selector:@selector(myDismissPopover)
                                             name:@"dismissPopover" 
                                           object:nil];
 
 并为UIPopover类添加扩展。 
 
- (void) myDismissPopover {
 [self dismissPopoverAnimated:YES];
}
 
 当我需要解雇popover时，我只需要发布通知。 
 
[[NSNotificationCenter defaultCenter] postNotificationName:@"dismissPopover" 
                                                    object:nil];

I'll write down my own solution as we've talked with bshirley in the comments of the question. I've implemented a mechanism like this to solve the problem:
 
In my login view controller, I create an NSMutableArray that will keep all my action sheets and popover controllers that are going to be dismissed. Then I store this array in a global dictionary. I access this dictionary via a utility method. Then all through the application, whoever creates an action sheet or a popover controller, adds the component to this array (retrieves the array from the global data, modifies it and then saves it back to the global data). Then when the user is thrown back to the login screen, in viewWillDisappear of my login view controller, I loop through this array and call the appropriate dismiss method by checking if the UIView I get from the array is an action sheet or a popover controller. Then I remove all the elements of this array and then store it back in the global data, again.
 
Hope this helps anyone who needs to implement a similar mechanism. Your comments will be appreciated.