Subview call Parent method and remove the subview

[Stan92]

Hi,
I display a modal View with a transparent background.
this is my code.

PHP Code:

        if (!mv) {
            mv=[[MvPersonsViewContoller alloc] init];
        }
            
        CGRect frame = mv.view.frame;
        frame.origin.y=20;
        mv.view.frame=frame;
        [[[self tabBarController] view] addSubview:mv.view];
        CATransition *animation = [CATransition animation];
        [animation setDelegate:self];
        [animation setType:kCATransitionMoveIn];
        [animation setSubtype:kCATransitionFromTop];
        [animation setDuration:0.75];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
        [[mv.view layer] addAnimation:animation forKey:kCATransition]; 


This subview contains a datePicker with a "Done" button, and I would like to
back to the main view when the user taps on the button.
I mean, I need to remove the subview and get the selected date.

I read some posts about protocol, but I have no clue how to implement it.

Also, I have 2 questions about this "modal popup".
My app uses a tabBarController and a NavigationController.
If I don't use this line
frame.origin.y=20;
when the popup appears, the tabBarController legends "overlay" the popup background.
The other question, is about to hide the "popup" when the user will tap on the button.....
How could I have the same animation to hide the popup (from top to bottom).

I thank you in advance for your help.

Stan