class NinethViewController: UIViewController,UISearchBarDelegate,UITableViewDelegate,UITableViewDataSource

 var searchBar:UISearchBar!var hTabV:UITableView!var ctrls:[String] = ["a","b","c","d","e"]var ctrlsel:[String] = []

func creatUI(){self.ctrlsel = self.ctrlsself.searchBar = UISearchBar(frame:CGRect(x:0,y:64,width:kScreenWidth,height:50))self.searchBar.delegate = self
//        self.searchBar.setShowsCancelButton(true, animated: true)
//        self.searchBar.showsSearchResultsButton = trueself.searchBar.placeholder = "请输入你想搜索的内容"
//        self.searchBar.showsCancelButton = false
        self.view.addSubview(self.searchBar)self.hTabV = UITableView(frame:CGRect(x:0,y:50+64,width:kScreenWidth,height:kScreenHeight-50))self.hTabV.delegate = selfself.hTabV.dataSource = selfself.hTabV.tableFooterView = UIView()self.hTabV.register(UITableViewCell().classForCoder, forCellReuseIdentifier: "cell")self.view.addSubview(self.hTabV)}

showsSearchResultsButton  搜索框右边显示一个圆形向下的按钮，单机会发送特殊事件
showsBookmarkButton  搜索框右边会显示一个书本的按钮，单机会发送特殊事件
showsCancelButton  搜索框右边会出现一个“cancel”按钮，单击会发送特殊事件
isSearchResultsButtonSelected  搜索结果按钮被选中
showsSearchResultsButton 搜索结果显示按钮

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {print(searchText)
//        没有搜索内容时显示全部组件if searchText == "" {self.ctrlsel = self.ctrls}else{self.ctrlsel = []for ctrl in self.ctrls {if ctrl.uppercased().hasPrefix(searchText.uppercased()) {self.ctrlsel.append(ctrl)}}}self.searchBar.endEditing(true)self.hTabV.reloadData()}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {return self.ctrlsel.count}func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {let identiferStr:String = "cell"let cell = tableView.dequeueReusableCell(withIdentifier: identiferStr, for: indexPath)cell.textLabel?.text = "\(self.ctrlsel[indexPath.row])"cell.accessoryType = .disclosureIndicatorreturn cell}

func creatUIs(){self.searchBar = UISearchBar(frame:CGRect(x:0,y:0,width:kScreenWidth,height:50))self.searchBar.showsCancelButton = true//通过参数searchResultsController传nil来初始化UISearchController，意思是我们告诉search controller我们会用相同的视图控制器来展示我们的搜索结果，如果我们想要指定一个不同的view controller，那就会被替代为显示搜索结果。searchController = UISearchController(searchResultsController:nil)//设置代理，searchResultUpdater是UISearchController的一个属性，它的值必须实现UISearchResultsUpdating协议，这个协议让我们的类在UISearchBar文字改变时被通知到，我们之后会实现这个协议。searchController.searchResultsUpdater = self as? UISearchResultsUpdating//默认情况下，UISearchController暗化前一个view，这在我们使用另一个view controller来显示结果时非常有用，但当前情况我们并不想暗化当前view，即设置开始搜索时背景是否显示searchController.dimsBackgroundDuringPresentation = false//设置默认显示内容searchController.searchBar.placeholder = "Search here..."//设置searchBar自适应大小
        searchController.searchBar.sizeToFit()//设置默认显示内容searchController.searchBar.delegate = self//设置definesPresentationContext为true，我们保证在UISearchController在激活状态下用户push到下一个view controller之后search bar不会仍留在界面上。searchController.definesPresentationContext = trueself.hTabV = UITableView(frame:CGRect(x:0,y:0,width:kScreenWidth,height:kScreenHeight))self.hTabV.delegate = selfself.hTabV.dataSource = selfself.hTabV.tableFooterView = UIView()self.hTabV.register(UITableViewCell().classForCoder, forCellReuseIdentifier: "cell")//设置tableview的头视图为searchController.searchBarself.hTabV.tableHeaderView = searchController.searchBarself.view.addSubview(self.hTabV)}