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ζʔϜΠϯɾΞ΢τͷΠϯλϥΫγϣϯʹؔ͢ΔΫϥε class ZoomAnimator: UIViewControllerAnimatedTransitioning class ZoomDismissalInteractionController: UIViewControllerInteractiveTransitioning class ZoomTransitionController: UIViewControllerTransitioningDelegate, UINavigationControllerDelegate { let animator: ZoomAnimator let interactionController: ZoomDismissalInteractionController var isInteractive: Bool = false … }

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ζʔϜΞχϝʔγϣϯ transitionImageView = UIImageView(image: referenceImage) transitionImageView.contentMode = .scaleAspectFill transitionImageView.clipsToBounds = true transitionImageView.frame = fromReferenceImageViewFrame containerView.addSubview(transitionImageView) … UIView.animate( withDuration: transitionDuration(using: transitionContext), delay: 0, options: [], animations: { … self.transitionImageView?.frame = finalSize … }, completion: { completed in … self.transitionImageView?.removeFromSuperview() … } )

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ԼʹҾͬுͬͯ໭Δ @objc func didPanWith(gestureRecognizer: UIPanGestureRecognizer) { switch gestureRecognizer.state { case .began: transitionController.isInteractive = true let _ = navigationController?.popViewController(animated: true) case .ended: if transitionController.isInteractive { transitionController.isInteractive = false transitionController.didPanWith(gestureRecognizer: gestureRecognizer) } default: if transitionController.isInteractive { transitionController.didPanWith(gestureRecognizer: gestureRecognizer) } } } 7JFX$POUSPMMFS

func didPanWith(gestureRecognizer: UIPanGestureRecognizer) { … let verticalDelta = translatedPoint.y < 0 ? 0 : translatedPoint.y let backgroundAlpha = backgroundAlphaFor(view: fromVC.view, withPanningVerticalDelta: verticalDelta) let scale = scaleFor(view: fromVC.view, withPanningVerticalDelta: verticalDelta) // update background alpha, scale, center … transitionContext.updateInteractiveTransition(1 - scale) if gestureRecognizer.state == .ended { let velocity = gestureRecognizer.velocity(in: fromVC.view) if velocity.y < 0 || center.y < anchorPoint.y { // cancel interactive transition … return } // start zoom out animation … } } ;PPN%JTNJTTBM*OUFSBDUJPO$POUSPMMFS

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