如何更改所有UICollectionView单元格的按钮图像？

class MyCollectionViewCell: UICollectionViewCell {
    var button: UIButton!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 创建按钮并设置初始图像
        button = UIButton(frame: CGRect(x: 0, y: 0, width: frame.width, height: frame.height))
        button.setImage(UIImage(named: "initialImage"), for: .normal)
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        addSubview(button)
    }
    
    @objc func buttonTapped() {
        // 按钮点击事件的处理逻辑
        if button.tag == 0 {
            button.setImage(UIImage(named: "newImage"), for: .normal)
        } else {
            button.setImage(UIImage(named: "initialImage"), for: .normal)
        }
    }
}

class MyCollectionViewDataSource: NSObject, UICollectionViewDataSource {
    // 实现UICollectionViewDataSource的其他方法
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! MyCollectionViewCell
        
        // 设置按钮的tag，用于标识按钮
        cell.button.tag = indexPath.row
        
        return cell
    }
}

class MyCollectionViewDelegate: NSObject, UICollectionViewDelegate {
    // 实现UICollectionViewDelegate的其他方法
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let cell = collectionView.cellForItem(at: indexPath) as! MyCollectionViewCell
        
        // 根据按钮的tag来更改按钮图像
        if cell.button.tag == 0 {
            cell.button.setImage(UIImage(named: "newImage"), for: .normal)
        } else {
            cell.button.setImage(UIImage(named: "initialImage"), for: .normal)
        }
    }
}

// 在你的ViewController中使用以上代码
let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: 200, height: 200), collectionViewLayout: UICollectionViewFlowLayout())
collectionView.register(MyCollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
collectionView.dataSource = MyCollectionViewDataSource()
collectionView.delegate = MyCollectionViewDelegate()