使用按钮的UISearchBar的最佳实践是什么

let searchBar = UISearchBar()
searchBar.delegate = self

searchBar.searchBarStyle = .minimal

let searchButton = UIBarButtonItem(barButtonSystemItem: .search, target: self, action: #selector(searchButtonTapped))
searchBar.showsBookmarkButton = false
searchBar.showsCancelButton = false
searchBar.showsSearchResultsButton = false
searchBar.searchTextField.rightView = searchButton

@objc func searchButtonTapped() {
    // 执行搜索操作
    performSearch()
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    // 执行搜索操作
    performSearch()
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    // 取消搜索操作
    cancelSearch()
}

func performSearch() {
    // 获取搜索关键字
    guard let keyword = searchBar.text else { return }
    
    // 执行搜索操作，例如向服务器发送搜索请求
    
    // 更新搜索结果
    updateSearchResults()
}

func cancelSearch() {
    // 取消搜索操作，例如取消网络请求
    
    // 清空搜索栏
    searchBar.text = ""
    searchBar.resignFirstResponder()
}