Why if I using this library, not called delegate methods ? about collectionviewpaginglayout HOT 4 CLOSED

import UIKit
import CollectionViewPagingLayout

class ViewController: UIViewController, UICollectionViewDataSource {
    
    var collectionView: UICollectionView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupCollectionView()
    }
    
    private func setupCollectionView() {
        collectionView = UICollectionView(frame: view.frame, collectionViewLayout: CollectionViewPagingLayout())
        collectionView.isPagingEnabled = true
        collectionView.register(MyCell.self, forCellWithReuseIdentifier: "cell")
        collectionView.dataSource = self
        view.addSubview(collectionView)
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        collectionView?.performBatchUpdates({
            self.collectionView.collectionViewLayout.invalidateLayout()
        })
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        10
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
    }
    
}

class MyCell: UICollectionViewCell, ScaleTransformView {
    
    var card: UIView!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setup()
    }
    
    func setup() {
        // use AutoLayout in real world
        card = UIView(frame: CGRect(x: 80, y: 100, width: frame.width - 160, height: frame.height - 200))
        card.backgroundColor = .gray
        contentView.addSubview(card)
    }
    
    let scaleOptions = ScaleTransformViewOptions(
        minScale: 0.6,
        scaleRatio: 0.4,
        translationRatio: CGPoint(x: 0.66, y: 0.2),
        maxTranslationRatio: CGPoint(x: 2, y: 0)
    )
}