84 lines
3.1 KiB
Swift
84 lines
3.1 KiB
Swift
// GalleryExpandAnimationController.swift
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// Tusker
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//
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// Created by Shadowfacts on 6/14/19.
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// Copyright © 2019 Shadowfacts. All rights reserved.
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//
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import UIKit
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import Gifu
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class GalleryExpandAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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return 0.2
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}
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func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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guard let fromVC = transitionContext.viewController(forKey: .from),
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let toVC = transitionContext.viewController(forKey: .to) as? GalleryViewController else {
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return
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}
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let attachment = toVC.attachments[toVC.startIndex]
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let (sourceFrame, sourceCornerRadius) = toVC.sourcesInfo[toVC.startIndex]
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let finalVCFrame = transitionContext.finalFrame(for: toVC)
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guard let data = ImageCache.attachments.get(attachment.url), let image = UIImage(data: data) else {
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toVC.view.frame = finalVCFrame
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transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
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return
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}
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let ratio = image.size.width / image.size.height
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var width = finalVCFrame.width
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var height = width / ratio
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let maxHeight = fromVC.view.bounds.height - fromVC.view.safeAreaInsets.top - fromVC.view.safeAreaInsets.bottom
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if height > maxHeight {
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let scaleFactor = maxHeight / height
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width *= scaleFactor
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height = maxHeight
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}
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let finalFrame = CGRect(x: finalVCFrame.midX - width / 2, y: finalVCFrame.midY - height / 2, width: width, height: height)
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let containerView = transitionContext.containerView
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let imageView = GIFImageView(frame: sourceFrame)
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imageView.image = image
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if attachment.url.pathExtension == "gif" {
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imageView.animate(withGIFData: data)
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}
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imageView.contentMode = .scaleAspectFill
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imageView.layer.cornerRadius = sourceCornerRadius
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imageView.layer.masksToBounds = true
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let blackView = UIView(frame: finalVCFrame)
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blackView.backgroundColor = .black
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blackView.alpha = 0
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containerView.addSubview(toVC.view)
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containerView.addSubview(blackView)
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containerView.addSubview(imageView)
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toVC.view.isHidden = true
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let duration = transitionDuration(using: transitionContext)
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UIView.animate(withDuration: duration, animations: {
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imageView.frame = finalFrame
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imageView.layer.cornerRadius = 0
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blackView.alpha = 1
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}, completion: { _ in
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toVC.view.frame = finalVCFrame
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toVC.view.isHidden = false
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fromVC.view.isHidden = false
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blackView.removeFromSuperview()
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imageView.removeFromSuperview()
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transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
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})
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}
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}
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