向UICollectionViewController底部添加UIView

import UIKit

class MyCollectionViewController: UICollectionViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建一个新的UIView对象
        let footerView = UIView(frame: CGRect(x: 0, y: 0, width: collectionView.frame.width, height: 50))
        footerView.backgroundColor = .lightGray
        
        // 将UIView添加到UICollectionViewController的视图中
        collectionView.addSubview(footerView)
        
        // 设置UIView的位置和大小
        footerView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            footerView.leadingAnchor.constraint(equalTo: collectionView.leadingAnchor),
            footerView.trailingAnchor.constraint(equalTo: collectionView.trailingAnchor),
            footerView.bottomAnchor.constraint(equalTo: collectionView.bottomAnchor),
            footerView.heightAnchor.constraint(equalToConstant: 50)
        ])
    }
    
    // 其他UICollectionViewController的相关代码...
}