54 lines
2.1 KiB
Swift
54 lines
2.1 KiB
Swift
//
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// SheetContainerPresentationAnimationController.swift
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// SheetController
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//
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// Created by Shadowfacts on 9/24/19.
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// Copyright © 2019 Shadowfacts. All rights reserved.
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//
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import UIKit
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class SheetContainerPresentationAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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return 0.35
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}
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func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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guard let toVC = transitionContext.viewController(forKey: .to) as? SheetContainerViewController else {
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fatalError()
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}
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toVC.dimmingView.isHidden = true
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let finalFrame = transitionContext.finalFrame(for: toVC)
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let dimmingView = UIView(frame: finalFrame)
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dimmingView.backgroundColor = toVC.dimmingView.backgroundColor
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dimmingView.alpha = 0
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let container = transitionContext.containerView
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container.addSubview(dimmingView)
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container.addSubview(toVC.view)
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toVC.view.transform = CGAffineTransform(translationX: 0, y: toVC.initialConstant)
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let duration = transitionDuration(using: transitionContext)
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UIView.animate(withDuration: duration, animations: {
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// we animate the dimming view's frame so that it doesn't go under the content view, in case there's a transparent background
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// we also extend the dimming view under any rounded corners the content view has
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dimmingView.frame = CGRect(x: 0, y: 0, width: dimmingView.bounds.width, height: toVC.initialConstant + toVC.content.view.layer.cornerRadius)
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dimmingView.alpha = toVC.dimmingView.alpha
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toVC.view.transform = .identity
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}, completion: { (finished) in
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dimmingView.removeFromSuperview()
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toVC.dimmingView.isHidden = false
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toVC.view.frame = finalFrame
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transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
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})
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}
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}
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