ios - 自定义 IOS 过渡在关闭视图控制器时显示白色空白屏幕

Question

我正在创建像 IOS 应用商店这样的英雄动画，点击应用打开详细信息页面，我能够毫无问题地创建演示动画，但是当我尝试关闭动画时，它显示了一段时间的白色背景屏幕，我尝试了所有解决方案它列在堆栈溢出中，例如仅添加子视图，将 modalPresentationStyle 更改为 .fullscreen 但在解雇期间无法摆脱白色背景 下面是我的示例代码

let today = TodayDetailViewController()
        today.transitioningDelegate = self
        today.modalPresentationStyle = .fullScreen
        guard let cell = collectionView.cellForItem(at: indexPath) else {
            return;
        }
        let cellFrame = collectionView.convert(cell.frame, to: collectionView.superview)
        modelTransition.originFrame = cellFrame;
        present(today, animated: true, completion: nil);

-- 动画过渡方法

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerView = transitionContext.containerView
        guard let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from) else { return }
        guard let toView = transitionContext.view(forKey: UITransitionContextViewKey.to) else { return }
        let modalView: UIView = presenting ? toView : fromView

        if(!presenting){

            edgeLayoutConstraints?.constants(to: 0)
            let animator = UIViewPropertyAnimator(duration: duration, dampingRatio: 0.8)
            animator.addAnimations {
                self.edgeLayoutConstraints?.match(to: self.originFrame,
                                             container: containerView)
                containerView.layoutIfNeeded()
                modalView.layoutIfNeeded()

            }
            animator.addCompletion { position in
                switch position {
                case .end:

                    transitionContext.completeTransition(true)
                default:
                    transitionContext.completeTransition(true)
                }
            }
            animator.startAnimation()


        }
        else{

            modalView.translatesAutoresizingMaskIntoConstraints = false
            containerView.addSubview(toView)

            edgeLayoutConstraints = NSEdgeLayoutConstraints(view: modalView,
                                                            container: containerView,
                                                            frame: originFrame)
            edgeLayoutConstraints?.toggleConstraints(true)
            containerView.layoutIfNeeded()
            modalView.layoutIfNeeded()
            let animator = UIViewPropertyAnimator(duration: duration, dampingRatio: 0.8)
            animator.addAnimations {
                self.edgeLayoutConstraints?.constants(to: 0)
                containerView.layoutIfNeeded()
                modalView.layoutIfNeeded()

            }
            animator.addCompletion { position in
                switch position {
                case .end:
                    transitionContext.completeTransition(true)
                default:
                    transitionContext.completeTransition(true)
                }
            }
            animator.startAnimation()
        }

标签： iosobjective-cswiftanimationios-animations