How to make UIPopoverController keep same position after rotating?

Question

I can\'t keep popover the same position on the screen after rotation. Is there any good way to do that, because just setting some frame to popover works terrible after rotating.

Answer 1

I have popoverPresentationController that I present on a view that has a "fake" nav bar. So I can't attach the popoverPresentationController to a barButtonItem. My popup appears in the right place but does not when the screen rotates.

So for some reason popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer, in view: AutoreleasingUnsafeMutablePointer) does not get called for me.

To work around this (iOS 12, Swift 4.2) I added constraints to the popup in the completion closure when calling present. Now my popup stays where I would expect it too.

                present(viewController, animated: true) { [weak self] in
            DDLogDebug(String(describing: viewController.view.frame))
            if let containerView = viewController.popoverPresentationController?.containerView,
            let presentedView = viewController.popoverPresentationController?.presentedView,
            let imageView = self?.headerView.settingsButton {
                withExtendedLifetime(self) {
                    let deltaY:CGFloat = presentedView.frame.origin.y - imageView.frame.maxY
                    let topConstraint = NSLayoutConstraint.init(item: presentedView, attribute: .top, relatedBy: .equal, toItem: imageView.imageView, attribute: .bottom, multiplier: 1, constant: deltaY)
                    topConstraint?.priority = UILayoutPriority(rawValue: 999)
                    topConstraint?.isActive = true
                    let heightContraint = NSLayoutConstraint.init(item: presentedView, attribute: .height, relatedBy: .equal, toItem: containerView, attribute: .height, multiplier: 0.75, constant: -deltaY)
                    heightContraint?.isActive = true
                    let leftConstraint = NSLayoutConstraint.init(item: presentedView, attribute: .left, relatedBy: .equal, toItem: containerView, attribute: .left, multiplier: 1, constant: presentedView.frame.origin.x)
                    leftConstraint.isActive = true
                    let widthConstraint = NSLayoutConstraint.init(item: presentedView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: presentedView.frame.width)
                    widthConstraint.isActive = true
                    presentedView.translatesAutoresizingMaskIntoConstraints = false
                }
            }
        }