106 lines
3.2 KiB
Swift
106 lines
3.2 KiB
Swift
//
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// ImageAnimator.swift
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 10/15/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import UIKit
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class ImageTransition: NSObject, UIViewControllerAnimatedTransitioning {
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private weak var articleController: ArticleViewController?
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private let duration = 0.4
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var presenting = true
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var originFrame: CGRect!
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var maskFrame: CGRect!
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var originImage: UIImage!
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init(controller: ArticleViewController) {
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self.articleController = controller
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}
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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return duration
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}
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func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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if presenting {
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animateTransitionPresenting(using: transitionContext)
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} else {
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animateTransitionReturning(using: transitionContext)
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}
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}
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private func animateTransitionPresenting(using transitionContext: UIViewControllerContextTransitioning) {
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let imageView = UIImageView(image: originImage)
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imageView.frame = originFrame
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let fromView = transitionContext.view(forKey: .from)!
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fromView.removeFromSuperview()
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transitionContext.containerView.backgroundColor = UIColor.systemBackground
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transitionContext.containerView.addSubview(imageView)
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articleController?.hideClickedImage()
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UIView.animate(
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withDuration: duration,
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delay:0.0,
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usingSpringWithDamping: 0.8,
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initialSpringVelocity: 0.2,
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animations: {
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let imageController = transitionContext.viewController(forKey: .to) as! ImageViewController
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imageView.frame = imageController.zoomedFrame
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}, completion: { _ in
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imageView.removeFromSuperview()
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let toView = transitionContext.view(forKey: .to)!
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transitionContext.containerView.addSubview(toView)
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transitionContext.completeTransition(true)
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})
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}
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private func animateTransitionReturning(using transitionContext: UIViewControllerContextTransitioning) {
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let imageController = transitionContext.viewController(forKey: .from) as! ImageViewController
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let imageView = UIImageView(image: originImage)
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imageView.frame = imageController.zoomedFrame
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let fromView = transitionContext.view(forKey: .from)!
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let windowFrame = fromView.window!.frame
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fromView.removeFromSuperview()
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let toView = transitionContext.view(forKey: .to)!
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transitionContext.containerView.addSubview(toView)
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let maskingView = UIView()
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let fullMaskFrame = CGRect(x: windowFrame.minX, y: maskFrame.minY, width: windowFrame.width, height: maskFrame.height)
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let path = UIBezierPath(rect: fullMaskFrame)
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let maskLayer = CAShapeLayer()
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maskLayer.path = path.cgPath
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maskingView.layer.mask = maskLayer
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maskingView.addSubview(imageView)
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transitionContext.containerView.addSubview(maskingView)
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UIView.animate(
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withDuration: duration,
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delay:0.0,
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usingSpringWithDamping: 0.8,
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initialSpringVelocity: 0.2,
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animations: {
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imageView.frame = self.originFrame
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}, completion: { _ in
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self.articleController?.showClickedImage() {
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DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
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imageView.removeFromSuperview()
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transitionContext.completeTransition(true)
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}
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}
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})
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}
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}
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