在 swift 中呈现导航控制器根本不工作时的自定义幻灯片动画

Question

所以我一直在关注一些关于如何在呈现视图控制器时执行自定义动画的教程。我目前有以下内容，

一个名为 TransitionManager 的 class 将在 ViewController 中实例化一个 将呈现视图
ViewController A 将在导航控制器中显示 ViewController B

根据我在视图表示中设置委托后阅读的所有教程，我应该会看到我的自定义过渡。但是，仍然使用默认动画。我试过在演示前后移动代表的设置，但无济于事

过渡经理Class

class TransitionManager: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate {
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        // get reference to our fromView, toView and the container view that we should perform the transition in
    let container = transitionContext.containerView
    let fromView = transitionContext.view(forKey: .from)!
    let toView = transitionContext.view(forKey: .to)!

    // set up from 2D transforms that we'll use in the animation
    let offScreenRight = CGAffineTransform(translationX: container.frame.width, y: 0)
    let offScreenLeft = CGAffineTransform(translationX: -container.frame.width, y: 0)

    // start the toView to the right of the screen
    if self.presenting {
        toView.transform = offScreenRight
    } else {
        toView.transform = offScreenLeft
    }


    // add the both views to our view controller
    container.addSubview(toView)
    container.addSubview(fromView)

    // get the duration of the animation
    // DON'T just type '0.5s' -- the reason why won't make sense until the next post
    // but for now it's important to just follow this approach
    let duration = self.transitionDuration(using: transitionContext)

    // perform the animation!
    // for this example, just slid both fromView and toView to the left at the same time
    // meaning fromView is pushed off the screen and toView slides into view
    // we also use the block animation usingSpringWithDamping for a little bounce
    UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: [], animations: {

        if self.presenting {
            toView.transform = offScreenLeft
        } else {
            toView.transform = offScreenRight
        }
        toView.transform = .identity

    }, completion: { finished in

        // tell our transitionContext object that we've finished animating
        transitionContext.completeTransition(true)

    })
    }

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

// MARK: UIViewControllerTransitioningDelegate protocol methods

// return the animataor when presenting a viewcontroller
func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    self.presenting = true
    return self
}

// return the animator used when dismissing from a viewcontroller
func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    self.presenting = false
    return self
}

}

ClassViewController一个

class ViewControllerA: UIViewController {
let transitionManager = TransitionManager()
func addButtonSelected() {
        let vc = ViewControllerB()
        let nav = UINavigationController(rootViewController: vc)
        present(nav, animated: true, completion: nil)
        nav.transitioningDelegate = self.transitionManager

    }
}

Answer 1

您需要将 modalPresentationStyle 设置为 .custom，在文档 here and here 中提到。我不确定这是否重要，但我也总是在调用 present:

之前设置转换委托

nav.modalPresentationStyle = .custom
nav.transitioningDelegate = self.transitionManager
present(nav, animated: true, completion: nil)

Answer 2

将您的方法更新为 swift3-:

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return Transition()
}

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return Transition()
}

在 swift 中呈现导航控制器根本不工作时的自定义幻灯片动画

Custom Slide in animation when presenting navigation controller not working at all in swift

uikit

uiviewanimation

ios

swift

过渡经理Class

ClassViewController一个