Question

更新到正确的版本，因为得到了答案。

我希望在导航视图控制器弹出/推送时淡入/淡出动画，然后我实现BaseViewController：

class BaseViewController: UIViewController, UINavigationControllerDelegate {

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.delegate = self
    }


    func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation, fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        if (operation == UINavigationControllerOperation.Push) {
            return FadeInAnimator()
        }

        if (operation == UINavigationControllerOperation.Pop) {
            return FadeOutAnimator()
        }
        return nil;
    }
}

和FadeInAnimator，FadeOutAnimator：

class FadeInAnimator: NSObject, UIViewControllerAnimatedTransitioning {

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
        return 0.5
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)
        transitionContext.containerView()?.addSubview(toViewController!.view)
        toViewController?.view.alpha = 0.0
        UIView.animateWithDuration(self.transitionDuration(transitionContext), animations: { () -> Void in
            toViewController?.view.alpha = 1.0
        }) { (finished) -> Void in
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
        }
    }
}

class FadeOutAnimator: NSObject, UIViewControllerAnimatedTransitioning {
    func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
        return 0.5
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
        let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)
        let fromViewController = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)
        transitionContext.containerView()?.insertSubview((toViewController?.view)!, belowSubview: (fromViewController?.view)!)

        UIView.animateWithDuration(self.transitionDuration(transitionContext), animations: { () -> Void in
            fromViewController?.view.alpha = 0.0
        }) { (finished) -> Void in
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
    }
}

然后，我添加了2个视图控制器并嵌入了导航视图控制器，ViewControllerA和ViewControllerB：

class ViewControllerA: BaseViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func pressButton(sender: UIButton) {

        if let vc = create(ViewControllerB) {
            self.navigationController?.pushViewController(vc, animated: true)
        }
    }  
}

class ViewControllerB: BaseViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

    }
}

按ViewControllerA上的按钮将创建并跳转到ViewControllerB，然后按导航栏项目＆＃34;返回＆＃34;在ViewControllerB上将返回ViewControllerA。

但它不起作用，按下按钮，ViewControllerA显示ViewControllerB，然后再次显示ViewControllerA。

有什么建议吗？我的xcode是7.1并在iPad Air 2模拟器上运行。

Answer 1

在动画完成块的FadeInAnimator中

更改此

transitionContext.completeTransition(transitionContext.transitionWasCancelled())

到

transitionContext.completeTransition(!transitionContext.transitionWasCancelled())

UINavigationControllerDelegate不起作用

1 个答案: