使用UIScrollview和UICollectionView滚动整个屏幕

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UIScrollView
        let scrollView = UIScrollView(frame: view.bounds)
        scrollView.isScrollEnabled = true
        view.addSubview(scrollView)
        
        // 设置内容大小为屏幕大小的两倍
        scrollView.contentSize = CGSize(width: view.bounds.width, height: view.bounds.height * 2)
        
        // 添加子视图到UIScrollView中
        let contentView = UIView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: view.bounds.height * 2))
        contentView.backgroundColor = .lightGray
        scrollView.addSubview(contentView)
        
        // 添加更多子视图到contentView中，以填充整个内容区域
        // ...
    }
}

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    var collectionView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UICollectionViewFlowLayout
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .vertical
        
        // 创建UICollectionView并设置布局
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.dataSource = self
        collectionView.delegate = self
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")
        view.addSubview(collectionView)
        
        // 设置内容大小为屏幕大小的两倍
        collectionView.contentSize = CGSize(width: view.bounds.width, height: view.bounds.height * 2)
    }
    
    // UICollectionViewDataSource方法
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        // 返回要显示的单元格数量
        return 10 // 示例中返回10个单元格
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
        cell.backgroundColor = .blue
        return cell
    }
    
    // UICollectionViewDelegateFlowLayout方法（可选）
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        // 返回单元格的大小
        return CGSize(width: view.bounds.width, height: view.bounds.height / 2) // 示例中每个单元格占屏幕高度的一半
    }
}