如何在Cocoa中为用户选择实现基于缩略图的视图？

import Cocoa

class ThumbnailItem: NSCollectionViewItem {
    @IBOutlet weak var thumbnailImageView: NSImageView!

    func configure(with image: NSImage) {
        thumbnailImageView.image = image
    }
}

class ViewController: NSViewController, NSCollectionViewDataSource, NSCollectionViewDelegate, NSCollectionViewDelegateFlowLayout {
    @IBOutlet weak var collectionView: NSCollectionView!

    let images: [NSImage] = [NSImage(named: "image1")!, NSImage(named: "image2")!, NSImage(named: "image3")!]

    override func viewDidLoad() {
        super.viewDidLoad()

        collectionView.register(ThumbnailItem.self, forItemWithIdentifier: NSUserInterfaceItemIdentifier(rawValue: "ThumbnailItem"))
        collectionView.dataSource = self
        collectionView.delegate = self
    }

    func numberOfSections(in collectionView: NSCollectionView) -> Int {
        return 1
    }

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

    func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
        let item = collectionView.makeItem(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "ThumbnailItem"), for: indexPath) as! ThumbnailItem
        item.configure(with: images[indexPath.item])
        return item
    }

    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
        return NSSize(width: 100, height: 100)
    }

    func collectionView(_ collectionView: NSCollectionView, didSelectItemsAt indexPaths: Set<IndexPath>) {
        guard let indexPath = indexPaths.first else { return }
        let selectedImage = images[indexPath.item]
        // Handle selection of image here
    }
}