A WIP iOS app for Mastodon and Pleroma.
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3 years ago
//
// LargeImageExpandAnimationController.swift
// Tusker
//
// Created by Shadowfacts on 9/1/18.
// Copyright © 2018 Shadowfacts. All rights reserved.
//
import UIKit
import Gifu
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class LargeImageExpandAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.2
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromVC = transitionContext.viewController(forKey: .from),
let toVC = transitionContext.viewController(forKey: .to) as? LargeImageViewController,
let originFrame = toVC.originFrame else {
return
}
let containerView = transitionContext.containerView
let finalVCFrame = transitionContext.finalFrame(for: toVC)
let image = toVC.imageView.image!
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let ratio = image.size.width / image.size.height
let width = finalVCFrame.width
let height = width / ratio
let finalFrame = CGRect(x: finalVCFrame.midX - width / 2, y: finalVCFrame.midY - height / 2, width: width, height: height)
let imageView = GIFImageView(frame: originFrame)
imageView.image = toVC.imageView.image!
if let gifData = toVC.gifData {
imageView.animate(withGIFData: gifData)
}
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imageView.contentMode = .scaleAspectFill
imageView.layer.cornerRadius = toVC.originCornerRadius!
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imageView.layer.masksToBounds = true
let blackView = UIView(frame: finalVCFrame)
blackView.backgroundColor = .black
blackView.alpha = 0
containerView.addSubview(toVC.view)
containerView.addSubview(blackView)
containerView.addSubview(imageView)
toVC.view.isHidden = true
let duration = transitionDuration(using: transitionContext)
UIView.animate(withDuration: duration, animations: {
imageView.frame = finalFrame
imageView.layer.cornerRadius = 0
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blackView.alpha = 1
}, completion: { _ in
// This shouldn't be necessary. I believe it's a workaround for using a XIB
// for the large image VC. Without this, the final frame of the large image VC
// is not set to the propper rect (it uses the frame of the preview device
// in the XIB). When using a storyboard, the final frame is automatically set
// (or UIKit does layout differently when loading the view) and this is not necessary.
toVC.view.frame = finalVCFrame
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toVC.view.isHidden = false
fromVC.view.isHidden = false
blackView.removeFromSuperview()
imageView.removeFromSuperview()
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
}