這個(gè)跟UINavigationController有什么區(qū)別呢？

其實(shí)就是對(duì)UINavigationController的封裝控制
let childNavigationController: UINavigationController

繼續(xù)看它是如何被構(gòu)造的

init(rootViewController: UIViewController = UIViewController()) {
        self.rootViewController = rootViewController
        self.childNavigationController = UINavigationController(rootViewController: rootViewController)
        super.init(nibName: nil, bundle: nil)
    }

    init(
        navigationBarClass: Swift.AnyClass?,
        toolbarClass: Swift.AnyClass?
    ) {
        self.rootViewController = UIViewController()
        self.childNavigationController = UINavigationController(
            navigationBarClass: navigationBarClass,
            toolbarClass: toolbarClass
        )
        super.init(nibName: nil, bundle: nil)
    }

功能舉個(gè)例子：

1. 如何Push一個(gè)Coordinator

    func pushCoordinator(coordinator: RootCoordinator, animated: Bool) {
        //用dictionary記錄vc于coordinator的關(guān)系：
viewControllersToChildCoordinators[coordinator.rootViewController] = coordinator
  //
        pushViewController(coordinator.rootViewController, animated: animated)
    }

    func pushViewController(_ viewController: UIViewController, animated: Bool) {
        childNavigationController.pushViewController(viewController, animated: animated)
    }