ios - 如何将 UINavigationControllerDelegate 连接到导航 Controller ？

Question

答案:简单语法错误 - 设置委托(delegate)时，它应该读取 SomeNavigationController.delegate = self，而不是 SomeNavigationController.navigationController?.delegate = self

下面是创建导航 Controller 的基本 View Controller 。我将 self 声明为它的委托(delegate)，并在该 View Controller 的扩展中遵守委托(delegate)的协议(protocol)，并创建一个对象作为自定义动画师。但此导航堆栈中的 View Controller 不采用此动画；我错过了什么？

此导航堆栈的 Root View Controller 中或在此堆栈中推送和弹出的 View Controller 中是否需要存在任何代码？或者所有自定义动画代码都属于这里(在创建导航 Controller 的 View Controller 中)而我只是缺少一些东西？


创建 UINavigationController 的 View Controller

class BaseViewController: UIViewController {

    override func loadView() {
        buildNavigationController()
    }

    func buildNavigationController() {
        let SomeNavigationControllerRoot = SomeViewController()
        let SomeNavigationController = UINavigationController(rootViewController: SomeNavigationControllerRoot)
        SomeNavigationController.delegate = self
        view.addSubview(SomeNavigationController.view)
    }

}

extension BaseViewController: UINavigationControllerDelegate {

    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return CustomAnimator()
    }

}

class CustomAnimator: NSObject, UIViewControllerAnimatedTransitioning {

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 1.0
    }


    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        let containerView = transitionContext.containerView
        let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)

        containerView.addSubview(toViewController!.view)

        toViewController!.view.alpha = 0.0

        UIView.animate(withDuration: 1.0, animations: {
            toViewController!.view.alpha = 1.0
        }, completion: { finished in
            let cancelled = transitionContext.transitionWasCancelled
            transitionContext.completeTransition(!cancelled)
        })

    }

}

UINavigationController 堆栈中的 Root View Controller

class SomeViewController: UIViewController, UINavigationControllerDelegate {

    func pushToNext() {
        let randomViewController = randomViewController()
        navigationController?.pushViewController(randomViewController, animated: true)
    }

}

Answer 1

如果你想使用自定义转换，你需要应用transitioningDelegate将 View Controller 的transitioningDelegate设置为您的自定义类并返回自定义动画 Controller 。