Completion handler for UINavigationController push or pop

UINavigationController+extensions.swift

/// https://stackoverflow.com/a/33767837
/// https://iganin.hatenablog.com/entry/2019/07/27/172911
extension UINavigationController {
    public func pushViewController(
        _ viewController: UIViewController,
        animated: Bool,
        completion: @escaping () -> Void) {
        pushViewController(viewController, animated: animated)
        guard animated, let coordinator = transitionCoordinator else {
            DispatchQueue.main.async { completion() }
            return
        }
        coordinator.animate(alongsideTransition: nil) { _ in completion() }
    }

    public func popViewController(
        animated: Bool,
        completion: @escaping () -> Void) {
        popViewController(animated: animated)
        guard animated, let coordinator = transitionCoordinator else {
            DispatchQueue.main.async { completion() }
            return
        }
        coordinator.animate(alongsideTransition: nil) { _ in completion() }
    }

    public func popToViewController(
        _ viewController: UIViewController,
        animated: Bool,
        completion: @escaping () -> Void) {
        popToViewController(viewController, animated: animated)
        guard animated, let coordinator = transitionCoordinator else {
            DispatchQueue.main.async { completion() }
            return
        }
        coordinator.animate(alongsideTransition: nil) { _ in completion() }
    }
}

UIWindow+extensions.swift

#if DEBUG

import UIKit

extension UIWindow {
    // WARNING: UIWindowのモーションジェスチャーを奪ってるので、利用する場合は要対応
    override open func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        guard motion == .motionShake else { return }
        let vc = UIViewController()
        guard vc.parent == nil,
            rootViewController?.presentedViewController == nil
            else { return }
        let navi = UINavigationController(rootViewController: vc)
        rootViewController?.present(navi, animated: true, completion: nil)
    }
}

#endif