UINavigationBar content margins in UIPresentationController subclass

[Daniel Stenmark]

I have a UIPresentationController subclass with a UINavigationBar embedded in 
the container view.  However, when setting the rightBarButtonItem, the spacing 
I usually expect from the item to the screen isn't there.

http://imgur.com/LHcqhyd<http://imgur.com/a/610al>

Anyone have an idea where I might be going wrong here?  The relevant code for 
the presentation controller is as follows:

@objc public protocol SheetPresentationControllerDelegate : class {
    func sheetPresentationControllerWillDismiss(_ sheetPresentationController: 
SheetPresentationController)
}

open class SheetPresentationController: UIPresentationController {



    fileprivate let dimmedView: UIView = {
        let result = UIView()
        result.backgroundColor = .black
        result.alpha = 0
        result.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        return result
    }()



    fileprivate let topView: UIView = {
        let result = UIView()
        result.backgroundColor = .white
        return result
    }()



    fileprivate let navigationBar: UINavigationBar = {
        let result = UINavigationBar()
        result.backgroundColor = .white
        result.items = [UINavigationItem()]
        return result
    }()



    open var title: String? {
        get {
            return self.navigationBar.topItem?.title
        }
        set {
            self.navigationBar.topItem?.title = newValue
        }
    }



    open var titleView: UIView? {
        get {
            return self.navigationBar.topItem?.titleView
        }
        set {
            self.navigationBar.topItem?.titleView = newValue
        }
    }



    open weak var sheetDelegate: SheetPresentationControllerDelegate?



    fileprivate dynamic func dismiss(_ sender: NSObject) {
        self.presentingViewController.dismiss(animated: true, completion: nil)
    }



    override open func presentationTransitionWillBegin() {
        super.presentationTransitionWillBegin()



        guard let containerView = self.containerView else {
            return
        }



        containerView.addSubview(self.dimmedView)
        self.dimmedView.frame = CGRect(origin: .zero, size: 
containerView.bounds.size)



        let gestureRecognizer = UITapGestureRecognizer(target: self, action: 
#selector(dismiss))
        self.dimmedView.addGestureRecognizer(gestureRecognizer)



        self.presentedViewController.transitionCoordinator?.animate( 
alongsideTransition: { (context) in
                self.dimmedView.alpha = 0.5



            }, completion: nil)



        containerView.addSubview(self.topView)
        containerView.addSubview(self.navigationBar)



        self.navigationBar.topItem?.rightBarButtonItems = 
[UIBarButtonItem(title: NSLocalizedString("Done", comment: ""), style: .done, 
target: self, action: #selector(dismiss))]
    }



    override open func dismissalTransitionWillBegin() {
        super.dismissalTransitionWillBegin()



        self.sheetDelegate?.sheetPresentationControllerWillDismiss(self)



        self.presentedViewController.transitionCoordinator?.animate( 
alongsideTransition: { (context) in
            self.dimmedView.alpha = 0



            }, completion: nil)
    }



    override open var frameOfPresentedViewInContainerView : CGRect {
        return CGRect(x: 0, y: self.navigationBar.frame.origin.y + 
self.navigationBar.intrinsicContentSize.height, width: 
self.containerView?.bounds.width ?? 0, height: 
self.presentedViewController.preferredContentSize.height)
    }



    override open func containerViewWillLayoutSubviews() {
        super.containerViewWillLayoutSubviews()



        self.topView.frame = CGRect(x: 0, y: 0, width: 
self.containerView?.bounds.width ?? 0, height: 
self.presentingViewController.topLayoutGuide.length)
        self.navigationBar.frame = CGRect(x: 0, y: self.topView.frame.origin.y 
+ self.topView.bounds.height, width: self.containerView?.bounds.width ?? 0, 
height: self.navigationBar.intrinsicContentSize.height)



        self.presentedView?.frame = self.frameOfPresentedViewInContainerView
    }
}

Dan
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