Ios 如何进行可弹出或推送的交互式UINavigationController转换？推送动画正在翻转？

我想有一个奇怪的

UINavigationController

概念，你可以通过向后平移将视图控制器从堆栈中弹出（就像iOS 7弹出手势），但它会记住弹出的视图控制器，允许你通过向另一个方向平移来“取消映射”（将其推回到堆栈上）。想象一下Safari中的前进和后退按钮，如果你后退，你仍然可以前进，如果你想把页面带回来

我已将

UINavigationController

子类化，并将自己设置为代理，返回一个

UIViewControllerAnimatedTransitioning

对象和一个

uipercentdriventeractivetransition

对象：

func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation, fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    if operation == .Push {
        return Animator(presenting: true)
    } else if operation == .Pop {
        return Animator(presenting: false)
    } else {
        return nil
    }
}

及

根据动画师是否设置为显示，我调用特定的方法，这适用于显示是否为真：

func presentWithTransitionContext(transitionContext: UIViewControllerContextTransitioning) {
    let toViewControllerView = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!.view
    let containerView = transitionContext.containerView()

    containerView.addSubview(toViewControllerView)
    toViewControllerView.transform = CGAffineTransformMakeTranslation(containerView.bounds.width, 0.0)
    applyShadowToView(toViewControllerView)

    let animationCurve: UIViewAnimationOptions = transitionContext.isInteractive() ? .CurveLinear : .CurveEaseInOut

    UIView.animateWithDuration(transitionDuration(transitionContext), delay: 0.0, options: animationCurve, animations: {
        toViewControllerView.transform = CGAffineTransformIdentity
    }, completion: { finished in
        return transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
    })
}

我覆盖

popViewControllerAnimated

，以便保存正在弹出的视图控制器：

override func popViewControllerAnimated(animated: Bool) -> UIViewController? {
    poppedViewControllers.insert(visibleViewController!, atIndex: 0)
    return super.popViewControllerAnimated(animated)
}

我在

UINavigationController

子类“

awakeFromNib（）

中添加了一个

uipangestureerecognizer

，它调用此方法来推送/弹出：

func panned(panGestureRecognizer: UIPanGestureRecognizer) {
    let panningRight = panGestureRecognizer.translationInView(view).x > 0
    let progress: CGFloat

    if panningRight {
        progress = panGestureRecognizer.translationInView(view).x / view.bounds.width
    } else {
        progress = -panGestureRecognizer.translationInView(view).x / view.bounds.width
    }

    if panGestureRecognizer.state == .Began {
        interactiveTransition = UIPercentDrivenInteractiveTransition()

        if panningRight {
            popViewControllerAnimated(true)
        } else {
            let viewControllerToPush = poppedViewControllers[0]
            poppedViewControllers.removeAtIndex(0)
            pushViewController(viewControllerToPush, animated: true)
        }
    } else if panGestureRecognizer.state == .Changed {
        interactiveTransition!.updateInteractiveTransition(progress)
    } else if panGestureRecognizer.state == .Ended {
        if progress > 0.5 {
            interactiveTransition!.finishInteractiveTransition()
        } else {
            interactiveTransition!.cancelInteractiveTransition()
        }

        interactiveTransition = nil
    } else if panGestureRecognizer.state == .Cancelled {
        interactiveTransition!.cancelInteractiveTransition()
        interactiveTransition = nil
    }
}

但是，每当我用手势将以前弹出的视图控制器推到导航堆栈上时，它会以相反的方式设置演示文稿的动画（正在演示的视图控制器立即显示，当前视图控制器滑开）。我不知道为什么会这样。不可能两个都做吗？我是否在应该删除视图时不删除视图

func panned(panGestureRecognizer: UIPanGestureRecognizer) {
    let panningRight = panGestureRecognizer.translationInView(view).x > 0
    let progress: CGFloat

    if panningRight {
        progress = panGestureRecognizer.translationInView(view).x / view.bounds.width
    } else {
        progress = -panGestureRecognizer.translationInView(view).x / view.bounds.width
    }

    if panGestureRecognizer.state == .Began {
        interactiveTransition = UIPercentDrivenInteractiveTransition()

        if panningRight {
            popViewControllerAnimated(true)
        } else {
            let viewControllerToPush = poppedViewControllers[0]
            poppedViewControllers.removeAtIndex(0)
            pushViewController(viewControllerToPush, animated: true)
        }
    } else if panGestureRecognizer.state == .Changed {
        interactiveTransition!.updateInteractiveTransition(progress)
    } else if panGestureRecognizer.state == .Ended {
        if progress > 0.5 {
            interactiveTransition!.finishInteractiveTransition()
        } else {
            interactiveTransition!.cancelInteractiveTransition()
        }

        interactiveTransition = nil
    } else if panGestureRecognizer.state == .Cancelled {
        interactiveTransition!.cancelInteractiveTransition()
        interactiveTransition = nil
    }
}