Popup Navigation Controller

PopupNavigationController.swift

import UIKit

class PopupNavigationController: UINavigationController {
    override init(rootViewController: UIViewController) {
        super.init(rootViewController: rootViewController)
        commonInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }
    
    override init(navigationBarClass: AnyClass?, toolbarClass: AnyClass?) {
        super.init(navigationBarClass: navigationBarClass, toolbarClass: toolbarClass)
        commonInit()
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        commonInit()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        popoverPresentationController?.sourceRect = popoverPresentationController?.sourceView?.bounds ?? .zero
    }
    
    private func commonInit() {
        modalPresentationStyle = .popover
        popoverPresentationController?.delegate = self
        popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
    }
}

extension PopupNavigationController: UIPopoverPresentationControllerDelegate {
    func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
        return .none
    }

    func popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer<CGRect>, in view: AutoreleasingUnsafeMutablePointer<UIView>) {
        rect.initialize(to: view.pointee.bounds)
    }
}