点击按钮更改UICollectionView单元格大小？

let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: 300, height: 200), collectionViewLayout: UICollectionViewFlowLayout())
collectionView.delegate = self
collectionView.dataSource = self

extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return yourData.count // 根据你的数据源返回数量
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! YourCustomCell
        // 根据数据源设置cell的内容
        return cell
    }
}

class YourCustomCell: UICollectionViewCell {
    let button = UIButton(type: .system)
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 设置按钮的样式和位置
        button.frame = CGRect(x: 0, y: 0, width: 50, height: 30)
        button.setTitle("Change Size", for: .normal)
        button.addTarget(self, action: #selector(changeSize), for: .touchUpInside)
        addSubview(button)
    }
    
    @objc func changeSize() {
        // 在这里修改UICollectionViewCell的大小
        // 可以通过修改frame或者约束来实现
    }
}