Find top shown view UIActionSheet

Question

I have the following code that displays an action sheet over the the current visible view (self.view)

[actionSheet showInView:[self view]];

But I'am unable to get a reference to this action sheet in the app delegate by using:

UIView *topView = [[self.window subviews] lastObject];

Answer 1

I believe that the action sheet is not really added as a subview:

- (void)didPresentActionSheet:(UIActionSheet *)actionSheet
{
    NSLog(@"%@, %@", actionSheet.superview, self.view);
}

So one of the ways would be to have a notification posted when the action sheet is displayed; for example:

// delegate = self;
- (void)didPresentActionSheet:(UIActionSheet *)actionSheet
{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"ActionSheetPresented" object:nil userInfo:@{@"actionSheet": actionSheet}];
}

And add an observer for the notification in the AppDelegate

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(displayed:) name:@"ActionSheetPresented" object:nil];

- (void)displayed:(NSNotification *)notification
{
    UIActionSheet *action = notification.userInfo[@"sheet"];
    NSLog(@"%@", action);
}

You might also just leave it is a public property in the view controller and reference in the AppDelegate whenever there is didPresentActionSheet: delegate API fires.