PresentSectionViewController 动画

动画效果：

import UIKit

class PresentSectionViewController : NSObject, UIViewControllerAnimatedTransitioning {

    var cellFrame : CGRect!
    var cellTransform : CATransform3D!

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {

        return 5
    }

    /**
     transitionDuration 方法返回转换动画的持续时间（秒）。在这种情况下，它返回 5 秒。

     animateTransition 方法负责动画化两个视图控制器之间的转换。它首先从转换上下文中检索目标视图控制器和容器视图。然后将目标视图添加到容器视图中，并设置动画的初始状态。

     接下来，它创建一个将平移和单元格变换组合在一起的变换。它将此变换应用于目标视图的层，并将其 zPosition 设置为 999。然后更新容器视图的布局。

     之后，它为目标视图的滚动视图设置了一些视觉效果，并使用平移和缩放变换对其进行了动画处理。

     最后，它创建了一个 UIViewPropertyAnimator 对象，用于动画化转换的最终状态。此动画器取消了某些约束条件、重置了某些变换并对其他变换进行了动画处理，以创建平滑的转换效果。
     */
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        let destination = transitionContext.viewController(forKey: .to) as! SectionViewController
        let containerView = transitionContext.containerView

        containerView.addSubview(destination.view)

        // Initial state

        let widthConstraint = destination.scrollView.widthAnchor.constraint(equalToConstant: 304)
        let heightConstraint = destination.scrollView.heightAnchor.constraint(equalToConstant: 248)
        let bottomConstraint = destination.scrollView.bottomAnchor.constraint(equalTo: destination.coverView.bottomAnchor)

        NSLayoutConstraint.activate([widthConstraint, heightConstraint, bottomConstraint])

        let translate = CATransform3DMakeTranslation(cellFrame.origin.x, cellFrame.origin.y, 0.0)
        let tranform = CATransform3DConcat(translate, cellTransform)

        destination.view.layer.transform = tranform
        destination.view.layer.zPosition = 999

        containerView.layoutIfNeeded()

        destination.scrollView.layer.cornerRadius = 14
        destination.scrollView.layer.shadowOpacity = 0.25
        destination.scrollView.layer.shadowOffset.height = 10
        destination.scrollView.layer.shadowRadius = 20

        let moveUpTransform = CGAffineTransform(translationX: 0, y: -100)
        let scaleUpTranform = CGAffineTransform(scaleX: 2, y: 2)
        let removeFromViewTransform = moveUpTransform.concatenating(scaleUpTranform)

        destination.closeVisualEffectView.alpha = 0
        destination.closeVisualEffectView.transform = removeFromViewTransform

        destination.subheadVisualEffectView.alpha = 0
        destination.subheadVisualEffectView.transform = removeFromViewTransform

        let animator = UIViewPropertyAnimator(duration: 5, dampingRatio: 0.7) {

            // Final state
            
            NSLayoutConstraint.deactivate([widthConstraint, heightConstraint, bottomConstraint])
            destination.view.layer.transform = CATransform3DIdentity
            destination.view.layoutIfNeeded()

            destination.scrollView.layer.cornerRadius = 0

            destination.closeVisualEffectView.alpha = 1
            destination.closeVisualEffectView.transform = .identity

            destination.subheadVisualEffectView.alpha = 1
            destination.subheadVisualEffectView.transform = .identity

            let scaleTranform = CGAffineTransform(scaleX: 1.2, y: 1.2)
            let moveTransform = CGAffineTransform(translationX: 30, y: 10)
            let titleTranform = scaleTranform.concatenating(moveTransform)

            destination.titleLabel.transform = titleTranform
        }

        animator.addCompletion { (finished) in

            // Completion

            transitionContext.completeTransition(true)
        }

        animator.startAnimation()
    }
}

调用方法：

import UIKit
import AVKit

class HomeViewController: UIViewController {
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var deviceImageView: UIImageView!
    @IBOutlet weak var playVisualEffectView: UIVisualEffectView!
    @IBOutlet weak var backgroundImageView: UIImageView!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var heroView: UIView!
    @IBOutlet weak var bookView: UIView!
    @IBOutlet weak var chapter1CollectionView: UICollectionView!
    var isStatusBarHidden = false

    let presentSectionViewController = PresentSectionViewController()
    
    @IBAction func playButtonTapped(_ sender: Any) {
        let urlString = "https://player.vimeo.com/external/235468301.hd.mp4?s=e852004d6a46ce569fcf6ef02a7d291ea581358e&profile_id=175"
        let url = URL(string: urlString)
        let player = AVPlayer(url: url!)
        let playerController = AVPlayerViewController()
        playerController.player = player
        present(playerController, animated: true) {
            player.play()
        }
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        navigationController?.setNavigationBarHidden(true, animated: false)
        
        scrollView.delegate = self
        chapter1CollectionView.delegate = self
        chapter1CollectionView.dataSource = self
        
        titleLabel.alpha = 0
        deviceImageView.alpha = 0
        playVisualEffectView.alpha = 0
        
        UIView.animate(withDuration: 1) {
            self.titleLabel.alpha = 1
            self.deviceImageView.alpha = 1
            self.playVisualEffectView.alpha = 1
        }
        
        // setStatusBarBackgroundColor(color: #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0.5))
    }
    
    func setStatusBarBackgroundColor(color: UIColor) {
        guard let statusBar = UIApplication.shared.value(forKeyPath: "statusBarWindow.statusBar") as? UIView else { return }
        statusBar.backgroundColor = color
    }
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "HomeToSection" {
            let destination = segue.destination as! SectionViewController
            let indexPath = sender as! IndexPath
            let section = sections[indexPath.row]
            destination.section = section
            destination.sections = sections
            destination.indexPath = indexPath
            destination.transitioningDelegate = self

            let attributes = chapter1CollectionView.layoutAttributesForItem(at: indexPath)!
            let cellFrame = chapter1CollectionView.convert(attributes.frame, to: view)

            presentSectionViewController.cellFrame = cellFrame
            presentSectionViewController.cellTransform = animateCell(cellFrame: cellFrame)
            
            isStatusBarHidden = true
            UIView.animate(withDuration: 0.5, animations: {
                self.setNeedsStatusBarAppearanceUpdate()
            })
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewDidAppear(true)
        isStatusBarHidden = false
        UIView.animate(withDuration: 0.5) {
            self.setNeedsStatusBarAppearanceUpdate()
        }
    }
    
    override var prefersStatusBarHidden: Bool {
        return isStatusBarHidden
    }
    
    override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation {
        return .slide
    }
}

extension HomeViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return sections.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "sectionCell", for: indexPath) as! SectionCollectionViewCell
        let section = sections[indexPath.row]
        cell.titleLabel.text = section["title"]
        cell.captionLabel.text = section["caption"]
        cell.coverImageView.image = UIImage(named: section["image"]!)
        
        cell.layer.transform = animateCell(cellFrame: cell.frame)
        
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        performSegue(withIdentifier: "HomeToSection", sender: indexPath)
    }
}

extension HomeViewController : UIViewControllerTransitioningDelegate {

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        return presentSectionViewController
    }
}

extension HomeViewController: UIScrollViewDelegate {
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        let offsetY = scrollView.contentOffset.y
        if offsetY < 0 {
            heroView.transform = CGAffineTransform(translationX: 0, y: offsetY)
            playVisualEffectView.transform = CGAffineTransform(translationX: 0, y: -offsetY/3)
            titleLabel.transform = CGAffineTransform(translationX: 0, y: -offsetY/3)
            deviceImageView.transform = CGAffineTransform(translationX: 0, y: -offsetY/4)
            backgroundImageView.transform = CGAffineTransform(translationX: 0, y: -offsetY/5)
        }
        
        if let collectionView = scrollView as? UICollectionView {
            for cell in collectionView.visibleCells as! [SectionCollectionViewCell] {
                let indexPath = collectionView.indexPath(for: cell)!
                let attributes = collectionView.layoutAttributesForItem(at: indexPath)!
                let cellFrame = collectionView.convert(attributes.frame, to: view)
                
                let translationX = cellFrame.origin.x / 5
                cell.coverImageView.transform = CGAffineTransform(translationX: translationX, y: 0)
                
                cell.layer.transform = animateCell(cellFrame: cellFrame)
            }
        }
        
        let navigationIsHidden = offsetY <= 0
        navigationController?.setNavigationBarHidden(navigationIsHidden, animated: true)
    }
    
    func animateCell(cellFrame: CGRect) -> CATransform3D {
        let angleFromX = Double((-cellFrame.origin.x) / 10)
        let angle = CGFloat((angleFromX * Double.pi) / 180.0)
        var transform = CATransform3DIdentity
        transform.m34 = -1.0/1000
        let rotation = CATransform3DRotate(transform, angle, 0, 1, 0)
        
        var scaleFromX = (1000 - (cellFrame.origin.x - 200)) / 1000
        let scaleMax: CGFloat = 1.0
        let scaleMin: CGFloat = 0.6
        if scaleFromX > scaleMax {
            scaleFromX = scaleMax
        }
        if scaleFromX < scaleMin {
            scaleFromX = scaleMin
        }
        let scale = CATransform3DScale(CATransform3DIdentity, scaleFromX, scaleFromX, 1)
        
        return CATransform3DConcat(rotation, scale)
    }
}