如何从另一个类刷新网格视图

class GridDataSource: NSObject, UICollectionViewDataSource, UICollectionViewDelegate {
    var data: [String] = []
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return data.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! CustomCell
        cell.textLabel.text = data[indexPath.item]
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        // Handle item selection
    }
    
    func refreshGrid() {
        // Update data source
        data = ["Item 1", "Item 2", "Item 3"]
        
        // Reload grid view
        collectionView.reloadData()
    }
}

// Usage
let dataSource = GridDataSource()
collectionView.dataSource = dataSource
collectionView.delegate = dataSource

// Refresh grid view
dataSource.refreshGrid()