在swift 5中，当我继续向右滚动时，collectionView的左侧卡住了

let layout = UICollectionViewFlowLayout()
layout.minimumInteritemSpacing = 10
layout.minimumLineSpacing = 10
layout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
collectionView.collectionViewLayout = layout

layout.scrollDirection = .horizontal

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CellIdentifier", for: indexPath) as! YourCustomCell
    // 配置cell
    return cell
}

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    
    var collectionView: UICollectionView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .horizontal
        layout.minimumInteritemSpacing = 10
        layout.minimumLineSpacing = 10
        layout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
        
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.dataSource = self
        collectionView.delegate = self
        collectionView.register(YourCustomCell.self, forCellWithReuseIdentifier: "CellIdentifier")
        view.addSubview(collectionView)
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20 // 返回你的数据数量
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CellIdentifier", for: indexPath) as! YourCustomCell
        // 配置cell
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 100, height: 100) // 设置cell的大小
    }
}