如何在Swift的搜索栏中设置动画？

import UIKit

class ViewController: UIViewController, UISearchBarDelegate {
    let searchBar = UISearchBar()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建搜索栏
        searchBar.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 50)
        view.addSubview(searchBar)
        
        // 设置搜索栏代理
        searchBar.delegate = self
    }
    
    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
        // 开始编辑时执行动画
        UIView.animate(withDuration: 0.3) {
            // 设置搜索栏向上移动
            self.searchBar.frame.origin.y = -self.searchBar.frame.height
        } completion: { _ in
            // 动画完成后隐藏搜索栏
            self.searchBar.isHidden = true
        }
    }
}