在UICollectionView中选择多个单元格

class MyCollectionViewController: UICollectionViewController {
    var selectedItems: [IndexPath] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView.allowsMultipleSelection = true
    }
    
    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        selectedItems.append(indexPath)
    }
    
    override func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
        if let index = selectedItems.firstIndex(of: indexPath) {
            selectedItems.remove(at: index)
        }
    }
    
    func performBatchOperation() {
        // 执行批量操作，例如删除选中的单元格
        let sortedItems = selectedItems.sorted { $0.item > $1.item }
        for indexPath in sortedItems {
            // 执行删除操作
            // ...
        }
        
        // 清空选中状态
        selectedItems.removeAll()
    }
}