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Features/imageviewer transition (michaelhenry#104)
used of dedicated transition.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,205 @@ | ||
| // | ||
| // ImageViewerTransitionPresentationManager.swift | ||
| // ImageViewer.swift | ||
| // | ||
| // Created by Michael Henry Pantaleon on 2020/08/19. | ||
| // | ||
|
|
||
| import Foundation | ||
| import UIKit | ||
|
|
||
| protocol ImageViewerTransitionViewControllerConvertible { | ||
|
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| // The source view | ||
| var sourceView: UIImageView? { get } | ||
|
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| // The final view | ||
| var targetView: UIImageView? { get } | ||
| } | ||
|
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| final class ImageViewerTransitionPresentationAnimator:NSObject { | ||
|
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| let isPresenting: Bool | ||
|
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| init(isPresenting: Bool) { | ||
| self.isPresenting = isPresenting | ||
| super.init() | ||
| } | ||
| } | ||
|
|
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| // MARK: - UIViewControllerAnimatedTransitioning | ||
| extension ImageViewerTransitionPresentationAnimator: UIViewControllerAnimatedTransitioning { | ||
|
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| func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) | ||
| -> TimeInterval { | ||
| return 0.3 | ||
| } | ||
|
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| func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { | ||
| let key: UITransitionContextViewControllerKey = isPresenting ? .to : .from | ||
| guard let controller = transitionContext.viewController(forKey: key) | ||
| else { return } | ||
|
|
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| let animationDuration = transitionDuration(using: transitionContext) | ||
|
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| if isPresenting { | ||
| presentAnimation( | ||
| transitionView: transitionContext.containerView, | ||
| controller: controller, | ||
| duration: animationDuration) { finished in | ||
| transitionContext.completeTransition(finished) | ||
| } | ||
|
|
||
| } else { | ||
| dismissAnimation( | ||
| transitionView: transitionContext.containerView, | ||
| controller: controller, | ||
| duration: animationDuration) { finished in | ||
| transitionContext.completeTransition(finished) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func createDummyImageView(frame: CGRect, image:UIImage? = nil) | ||
| -> UIImageView { | ||
| let dummyImageView:UIImageView = UIImageView(frame: frame) | ||
| dummyImageView.clipsToBounds = true | ||
| dummyImageView.contentMode = .scaleAspectFill | ||
| dummyImageView.alpha = 1.0 | ||
| dummyImageView.image = image | ||
| return dummyImageView | ||
| } | ||
|
|
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| private func presentAnimation( | ||
| transitionView:UIView, | ||
| controller: UIViewController, | ||
| duration: TimeInterval, | ||
| completed: @escaping((Bool) -> Void)) { | ||
|
|
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| guard | ||
| let transitionVC = controller as? ImageViewerTransitionViewControllerConvertible | ||
| else { return } | ||
|
|
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| let sourceView = transitionVC.sourceView | ||
|
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| let dummyImageView = createDummyImageView( | ||
| frame: sourceView?.frameRelativeToWindow() ?? .zero, | ||
| image: sourceView?.image) | ||
| transitionView.addSubview(dummyImageView) | ||
|
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| sourceView?.alpha = 0.0 | ||
|
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| transitionView.addSubview(controller.view) | ||
| controller.view.alpha = 0.0 | ||
|
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| UIView.animate(withDuration: duration, animations: { | ||
| dummyImageView.contentMode = .scaleAspectFit | ||
| dummyImageView.frame = UIScreen.main.bounds | ||
| controller.view.alpha = 1.0 | ||
| }) { finished in | ||
| dummyImageView.removeFromSuperview() | ||
| completed(finished) | ||
| } | ||
| } | ||
|
|
||
| private func dismissAnimation( | ||
| transitionView:UIView, | ||
| controller: UIViewController, | ||
| duration:TimeInterval, | ||
| completed: @escaping((Bool) -> Void)) { | ||
|
|
||
| guard | ||
| let transitionVC = controller as? ImageViewerTransitionViewControllerConvertible | ||
| else { return } | ||
|
|
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| let sourceView = transitionVC.sourceView | ||
| let targetView = transitionVC.targetView | ||
|
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| let dummyImageView = createDummyImageView( | ||
| frame: targetView?.frameRelativeToWindow() ?? UIScreen.main.bounds, | ||
| image: targetView?.image) | ||
| transitionView.addSubview(dummyImageView) | ||
| targetView?.isHidden = true | ||
|
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| controller.view.alpha = 1.0 | ||
| UIView.animate(withDuration: duration, animations: { | ||
| if let sourceView = sourceView { | ||
| // return to original position | ||
| dummyImageView.frame = sourceView.frameRelativeToWindow() | ||
| } else { | ||
| // just disappear | ||
| dummyImageView.alpha = 0.0 | ||
| } | ||
| controller.view.alpha = 0.0 | ||
| }) { finished in | ||
| sourceView?.alpha = 1.0 | ||
| controller.view.removeFromSuperview() | ||
| completed(finished) | ||
| } | ||
| } | ||
| } | ||
|
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| final class ImageViewerTransitionPresentationController: UIPresentationController { | ||
|
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| override var frameOfPresentedViewInContainerView: CGRect { | ||
| var frame: CGRect = .zero | ||
| frame.size = size(forChildContentContainer: presentedViewController, | ||
| withParentContainerSize: containerView!.bounds.size) | ||
| return frame | ||
| } | ||
|
|
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| override func containerViewWillLayoutSubviews() { | ||
| presentedView?.frame = frameOfPresentedViewInContainerView | ||
| } | ||
| } | ||
|
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| final class ImageViewerTransitionPresentationManager: NSObject { | ||
|
|
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| } | ||
|
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| // MARK: - UIViewControllerTransitioningDelegate | ||
| extension ImageViewerTransitionPresentationManager: UIViewControllerTransitioningDelegate { | ||
| func presentationController( | ||
| forPresented presented: UIViewController, | ||
| presenting: UIViewController?, | ||
| source: UIViewController | ||
| ) -> UIPresentationController? { | ||
| let presentationController = ImageViewerTransitionPresentationController( | ||
| presentedViewController: presented, | ||
| presenting: presenting) | ||
| return presentationController | ||
| } | ||
|
|
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| func animationController( | ||
| forPresented presented: UIViewController, | ||
| presenting: UIViewController, | ||
| source: UIViewController | ||
| ) -> UIViewControllerAnimatedTransitioning? { | ||
|
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| return ImageViewerTransitionPresentationAnimator(isPresenting: true) | ||
| } | ||
|
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| func animationController( | ||
| forDismissed dismissed: UIViewController | ||
| ) -> UIViewControllerAnimatedTransitioning? { | ||
| return ImageViewerTransitionPresentationAnimator(isPresenting: false) | ||
| } | ||
| } | ||
|
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| // MARK: - UIAdaptivePresentationControllerDelegate | ||
| extension ImageViewerTransitionPresentationManager: UIAdaptivePresentationControllerDelegate { | ||
|
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| func adaptivePresentationStyle( | ||
| for controller: UIPresentationController, | ||
| traitCollection: UITraitCollection | ||
| ) -> UIModalPresentationStyle { | ||
| return .none | ||
| } | ||
|
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| func presentationController( | ||
| _ controller: UIPresentationController, | ||
| viewControllerForAdaptivePresentationStyle style: UIModalPresentationStyle | ||
| ) -> UIViewController? { | ||
| return nil | ||
| } | ||
| } |
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