CollectionView不更新可见单元格

Question

下午好！

面对这个问题，有一个集合，其中在整个屏幕上的单元格中都配置有数据，并且该单元格内有一些事件使该集合重新加载，因此无法进行检查，如果该单元格现在是可见，没有必要完全更新它，而只是部分数据，我还不知道该怎么做，有人可以提示吗！

测试项目））

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    @IBOutlet weak var collectionViwe: UICollectionView!

    let dataSource = [1,2,3,4,5,6,7,8,9]

    override func viewDidLoad() {
        super.viewDidLoad()
        collectionViwe.isPagingEnabled = true
        collectionViwe.register(Cell.self, forCellWithReuseIdentifier: "Cell")
        // Do any additional setup after loading the view.
    }


    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return dataSource.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! Cell
        let text = String(dataSource[indexPath.row])
        if cell.label.text != text {
            cell.label.text = text
            cell.label.backgroundColor = .random()
        }

        return cell
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return view.frame.size
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return .zero
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        collectionView.reloadData()
    }

}

class Cell: UICollectionViewCell {

    let label = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        label.backgroundColor = .red
        addSubview(label)
        label.frame = CGRect(x: 36, y: 36, width: 200, height: 100)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

}


extension CGFloat {
    static func random() -> CGFloat {
        return CGFloat(arc4random()) / CGFloat(UInt32.max)
    }
}

extension UIColor {
    static func random() -> UIColor {
        return UIColor(red:   .random(),
                       green: .random(),
                       blue:  .random(),
                       alpha: 1.0)
    }
}