How can we make this? about animatedcollectionviewlayout HOT 5 CLOSED

import Foundation

public struct SwapOutAttributesAnimator: LayoutAttributesAnimator {
    
    private let maxWidthRadio: CGFloat
    private let minDistanceRadio: CGFloat
    private let scaleRate: CGFloat
    
    public init(maxWidthRadio: CGFloat = 0.7, minDistanceRadio: CGFloat = 0.5, scaleRate: CGFloat = 0.5) {
        self.maxWidthRadio = maxWidthRadio
        self.minDistanceRadio = minDistanceRadio
        self.scaleRate = scaleRate
    }
    
    public func animate(collectionView: UICollectionView, attributes: AnimatedCollectionViewLayoutAttributes) {
        let position = attributes.middleOffset
        
        // guard let contentView = attributes.contentView else { return }
        let contentOffset = collectionView.contentOffset
        let period = CGFloat.pi - asin(minDistanceRadio / maxWidthRadio)
        
        attributes.frame = CGRect(origin: contentOffset, size: attributes.frame.size)
        
        switch Double(position) {
        case -2.0...2.0:
            let offsetFromCenter = CGFloat(sin(period * position))
             let translationTransform: CGAffineTransform
            if attributes.scrollDirection == .horizontal {
                let offset = offsetFromCenter * maxWidthRadio * collectionView.bounds.width
                translationTransform = CGAffineTransform(translationX: offset, y: 0)
            } else {
                let offset = offsetFromCenter * maxWidthRadio * collectionView.bounds.height
                translationTransform = CGAffineTransform(translationX: 0, y: offset)
            }

            let scaleFactor = max(scaleRate - 0.2 * abs(position), 0.0)
            let scaleTransform = CGAffineTransform(scaleX: scaleFactor, y: scaleFactor)
            attributes.transform = translationTransform.concatenating(scaleTransform)
            
            let zIndex = -pow(abs(position), 2.0) + 1.0
            attributes.zIndex = Int(zIndex * 1000)
            attributes.alpha = 1
        default:
            attributes.alpha = 0
        }
    }
}