iOS 自定义过渡和旋转

Question

我正在使用自定义过渡来显示全屏模态游戏 View 。当用户开始游戏时， Root View Controller 缩小“进入”屏幕，而全屏游戏 View Controller 从更大的比例缩小到显示器上，同时从 0% 不透明度过渡到 100% 不透明度。很简单!

过渡看起来很棒并且运行良好，在关闭游戏 View Controller 时也能正确反转动画。

我遇到的问题是，如果在显示全屏游戏 View Controller 时旋转设备，返回到 Root View Controller 时，布局就会一团糟。进一步旋转并不能解决问题，布局很乱，而且一直很乱。

如果我禁用自定义转换，这个问题就消失了。此外，如果我保留自定义过渡，但在过渡动画中禁用在我的源 View 和目标 View 上设置 CATransform3D 的调用，问题会再次消失。

这是我的过渡代表:

class FullscreenModalTransitionManager: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate  {

    private var presenting:Bool = true

    // MARK: UIViewControllerAnimatedTransitioning protocol methods

    func animateTransition(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.viewForKey(UITransitionContextFromViewKey)!
        let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!

        let scale:CGFloat = 1.075
        //let bigScale = CGAffineTransformMakeScale(scale, scale)
        //let smallScale = CGAffineTransformMakeScale(1/scale,1/scale)
        let bigScale = CATransform3DMakeScale(scale, scale, 1)
        let smallScale = CATransform3DMakeScale(1/scale, 1/scale, 1)
        let smallOpacity:CGFloat = 0.5
        let presenting = self.presenting

        if presenting {

            // when presenting, incoming view must be on top
            container.addSubview(fromView)
            container.addSubview(toView)

            toView.layer.transform = bigScale
            toView.opaque = false
            toView.alpha = 0

            fromView.layer.transform = CATransform3DIdentity
            fromView.opaque = false
            fromView.alpha = 1
        } else {

            // when !presenting, outgoing view must be on top
            container.addSubview(toView)
            container.addSubview(fromView)

            toView.layer.transform = smallScale
            toView.opaque = false
            toView.alpha = smallOpacity

            fromView.layer.transform = CATransform3DIdentity
            fromView.opaque = false
            fromView.alpha = 1
        }


        let duration = self.transitionDuration(transitionContext)

        UIView.animateWithDuration(duration,
            delay: 0.0,
            usingSpringWithDamping: 0.7,
            initialSpringVelocity: 0,
            options: nil,
            animations: {

                if presenting {
                    fromView.layer.transform = smallScale
                    fromView.alpha = smallOpacity
                } else {
                    fromView.layer.transform = bigScale
                    fromView.alpha = 0
                }

            },
            completion: nil )

        UIView.animateWithDuration(duration,
            delay: duration/6,
            usingSpringWithDamping: 0.7,
            initialSpringVelocity: 0.5,
            options: nil,
            animations: {
                toView.layer.transform = CATransform3DIdentity
                toView.alpha = 1
            },
            completion: { finished in
                transitionContext.completeTransition(true)
            })
    }

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

    // 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
    }
}

并且，为了视觉引用，这是我的 Root View Controller 通常的样子:

并且，为了视觉引用，如果我在游戏 View 中旋转我的设备(至少一次)并返回到 Root View Controller ，这是我的 Root View Controller 的样子。

最后一点——以防万一——我正在使用自动布局和大小类来布置我的 Root View Controller 。

谢谢，

Answer 1

我有一个类似的问题，我在导航 Controller 上为推送和弹出编写了一个自定义转换。如果您在按下后旋转设备，当您返回到 Root View Controller 时，它的框架将保持不变。

---

问题

---

解决方案

objective-c

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {

    // ViewController Reference
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    // Fix layout bug in iOS 9+
    toViewController.view.frame = [transitionContext finalFrameForViewController:toViewController];

    // The rest of your code ...
} 

---

swift 3.0

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

    // ViewController reference
    let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)!

    // Fix layout bug in iOS 9+
    toViewController.view.frame = transitionContext.finalFrame(for: toViewController)

    // The rest of your code ...
}