推送时未调用 animateTransition

Question

我刚刚指出：

func animateTransition(transitionContext: UIViewControllerContextTransitioning)

不叫 id 我推我的UIViewController：

navigationController?.pushViewController(nextVC, animated: true)

否则，如果我展示我的UIViewController：

navigationController?.presentViewController(nextVC, animated: true, completion: nil)

我的动画有效是因为 animateTransition 被调用

编辑：

它的用法如下：

let transitionManager = TransitionManager()
nextVC.transitioningDelegate = transitionManager
navigationController?.pushViewController(nextVC, animated: true)

完整的动画类是：

class TransitionManager: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate {
    private var presenting = true

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let container = transitionContext.containerView()
        let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
        let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!


        let offScreenRight = CGAffineTransformMakeTranslation(container!.frame.width, 0)
        let offScreenLeft = CGAffineTransformMakeTranslation(-container!.frame.width, 0)

        toView.transform = offScreenRight

        container!.addSubview(toView)
        container!.addSubview(fromView)


        let duration = self.transitionDuration(transitionContext)


        UIView.animateWithDuration(duration, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: [], animations: {
            fromView.transform = offScreenLeft
            toView.transform = CGAffineTransformIdentity

            }) { (finished) in
                transitionContext.completeTransition(true)
         }


    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
        return 2
    }

    // MARK: UIViewControllerTransitioningDelegate protocol methods
     func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
         self.presenting = true
        return self
    }
     func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        self.presenting = false
        return self
    }
}

Answer 1

问题是你说的是：

nextVC.transitioningDelegate = transitionManager

这就是配置当前自定义转换的方式。但这不是配置推送自定义转换的方式。

要配置推送自定义转换，请为导航控制器指定一个delegate（不是transitioningDelegate），并在委托中实现：

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