129 lines
5.2 KiB
Swift
129 lines
5.2 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import UIKit
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protocol ZoomAnimatorDelegate: class {
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func transitionWillStartWith(zoomAnimator: ZoomAnimator)
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func transitionDidEndWith(zoomAnimator: ZoomAnimator)
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func referenceView(for zoomAnimator: ZoomAnimator) -> UIView?
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func referenceViewFrameInTransitioningView(for zoomAnimator: ZoomAnimator) -> CGRect?
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}
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class ZoomAnimator: NSObject {
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weak var fromDelegate: ZoomAnimatorDelegate?
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weak var toDelegate: ZoomAnimatorDelegate?
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var transitionView: UIView?
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var isPresenting = true
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}
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extension ZoomAnimator: UIViewControllerAnimatedTransitioning {
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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isPresenting ? .defaultAnimationDuration : .shortAnimationDuration
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}
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func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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fromDelegate?.transitionWillStartWith(zoomAnimator: self)
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toDelegate?.transitionWillStartWith(zoomAnimator: self)
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if isPresenting {
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animateZoomInTransition(using: transitionContext)
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} else {
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animateZoomOutTransition(using: transitionContext)
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}
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}
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}
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private extension ZoomAnimator {
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private func animateZoomInTransition(using transitionContext: UIViewControllerContextTransitioning) {
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guard
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let toVC = transitionContext.viewController(forKey: .to),
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let fromVC = transitionContext.viewController(forKey: .from),
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let fromReferenceView = fromDelegate?.referenceView(for: self),
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let toReferenceView = toDelegate?.referenceView(for: self),
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let fromReferenceViewFrame = fromDelegate?.referenceViewFrameInTransitioningView(for: self)
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else { return }
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toVC.view.alpha = 0
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toReferenceView.isHidden = true
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transitionContext.containerView.addSubview(toVC.view)
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if transitionView == nil, let transitionView = (fromReferenceView as? ZoomAnimatableView)?.transitionView() {
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transitionView.frame = fromReferenceViewFrame
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self.transitionView = transitionView
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transitionContext.containerView.addSubview(transitionView)
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}
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fromReferenceView.isHidden = true
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let finalTransitionSize = (fromReferenceView as? ZoomAnimatableView)?.frame(inView: toVC.view) ?? .zero
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UIView.animate(
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withDuration: transitionDuration(using: transitionContext),
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delay: 0,
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usingSpringWithDamping: 0.8,
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initialSpringVelocity: 0,
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options: [.transitionCrossDissolve]) {
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self.transitionView?.frame = finalTransitionSize
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toVC.view.alpha = 1.0
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fromVC.tabBarController?.tabBar.alpha = 0
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} completion: { _ in
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self.transitionView?.removeFromSuperview()
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toReferenceView.isHidden = false
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fromReferenceView.isHidden = false
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self.transitionView = nil
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transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
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self.toDelegate?.transitionDidEndWith(zoomAnimator: self)
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self.fromDelegate?.transitionDidEndWith(zoomAnimator: self)
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}
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}
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private func animateZoomOutTransition(using transitionContext: UIViewControllerContextTransitioning) {
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let containerView = transitionContext.containerView
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guard
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let toVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to),
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let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
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let fromReferenceView = fromDelegate?.referenceView(for: self),
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let fromReferenceViewFrame = fromDelegate?.referenceViewFrameInTransitioningView(for: self)
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else { return }
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let toReferenceView = toDelegate?.referenceView(for: self)
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let toReferenceViewFrame = toDelegate?.referenceViewFrameInTransitioningView(for: self)
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toReferenceView?.isHidden = true
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if transitionView == nil, let transitionView = (fromReferenceView as? ZoomAnimatableView)?.transitionView() {
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transitionView.frame = fromReferenceViewFrame
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self.transitionView = transitionView
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containerView.addSubview(transitionView)
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}
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containerView.insertSubview(toVC.view, belowSubview: fromVC.view)
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fromReferenceView.isHidden = true
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UIView.animate(
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withDuration: transitionDuration(using: transitionContext)) {
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fromVC.view.alpha = 0
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if let toReferenceViewFrame = toReferenceViewFrame {
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self.transitionView?.frame = toReferenceViewFrame
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} else {
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self.transitionView?.alpha = 0
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}
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toVC.tabBarController?.tabBar.alpha = 1
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} completion: { _ in
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self.transitionView?.removeFromSuperview()
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toReferenceView?.isHidden = false
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fromReferenceView.isHidden = false
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transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
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self.toDelegate?.transitionDidEndWith(zoomAnimator: self)
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self.fromDelegate?.transitionDidEndWith(zoomAnimator: self)
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}
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}
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}
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