78 lines
3.1 KiB
Swift
78 lines
3.1 KiB
Swift
//
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// LargeImageExpandAnimationController.swift
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// Tusker
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//
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// Created by Shadowfacts on 9/1/18.
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// Copyright © 2018 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 LargeImageExpandAnimationController: 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? LargeImageViewController else {
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return
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}
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let finalVCFrame = transitionContext.finalFrame(for: toVC)
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guard let (image, originFrame, originCornerRadius) = toVC.sourceInfo 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 containerView = transitionContext.containerView
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let ratio = image.size.width / image.size.height
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let width = finalVCFrame.width
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let height = width / ratio
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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 imageView = GIFImageView(frame: originFrame)
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imageView.image = toVC.imageView.image!
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if let gifData = toVC.gifData {
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imageView.animate(withGIFData: gifData)
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}
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imageView.contentMode = .scaleAspectFill
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imageView.layer.cornerRadius = originCornerRadius
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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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// This shouldn't be necessary. I believe it's a workaround for using a XIB
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// for the large image VC. Without this, the final frame of the large image VC
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// is not set to the propper rect (it uses the frame of the preview device
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// in the XIB). When using a storyboard, the final frame is automatically set
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// (or UIKit does layout differently when loading the view) and this is not necessary.
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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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