Swift - CompositionalLayout -计算高度

import UIKit

class MyViewController: UIViewController, UICollectionViewDelegateFlowLayout {
    
    // 定义集合视图
    var collectionView: UICollectionView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建布局
        let layout = UICollectionViewCompositionalLayout { (sectionIndex, layoutEnvironment) -> NSCollectionLayoutSection? in
            // 定义布局规则
            // ...
        }
        
        // 创建集合视图
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.delegate = self
        view.addSubview(collectionView)
    }
    
    // 实现计算高度的方法
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        // 根据内容计算高度
        // ...
        return CGSize(width: collectionView.bounds.width, height: calculatedHeight)
    }
}