how to add close button to modal view corner which is presented in UIModalPresentationPageSheet?

Question

I want to add a floating close (x) button at the corner of an UIModalPresentationPageSheet View. The effect is like below:

Answer 1

You can try and add it to the the topmost application window:

    add.modalPresentationStyle = UIModalPresentationPageSheet;
    [self presentViewController:add animated:YES completion:^{
        [[[[UIApplication sharedApplication] windows] lastObject] addSubview:button];
    }];

This should give you the right view to allow the button to appear on top of the modal and receive touch events.

--edit--

To position the button you can try something like this:

self.modalPresentationStyle = UIModalPresentationFormSheet;
add.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:pvc animated:YES completion:^{
    CGRect parentView = pvc.view.superview.frame;
    CGRect buttonFrame = button.frame;
    buttonFrame.origin = CGPointMake(parentView.origin.x - buttonFrame.size.width/2.0f, parentView.origin.y - buttonFrame.size.height/2.0f);

    [button setFrame:buttonFrame];
    [[[[UIApplication sharedApplication] windows] lastObject] addSubview:button];
}];

This will get the frame of the modalView that has been presented. You can then set your button's origin to be offset and set the adjusted frame.