搜索条(在表格中)实现搜索功能

/*此代码可通过首字母实现搜索*/<UITableViewDataSource,UITableViewDelegate,UISearchBarDelegate>{    NSArray *_allData;    //搜索条    UISearchBar *search;    //搜索控制器    UISearchDisplayController *displayCon;    //搜索结果    NSArray *_resultArr;}@property(nonatomic,strong)UITableView *table;//表格//重写get方法-(UITableView *)table{    if (!_table) {        _table = [[UITableView alloc]initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height-20) style:UITableViewStylePlain];        _table.dataSource = self;        _table.delegate = self;    }    return _table;}- (void)viewDidLoad {    [super viewDidLoad];    //模拟数据  //  _allData = [NSArray arrayWithArray:[UIFont familyNames]];  _allData = [NSArray arrayWithObjects:@"小明",@"李花",@"周华",@"丁俊晖",@"王强", nil];    [self.view addSubview:self.table];    //初始化搜索条    search = [[UISearchBar alloc]init];    //设置提示文字    search.placeholder = @"搜索姓名";    search.delegate = self;    //初始化搜索控制器    displayCon = [[UISearchDisplayController alloc]initWithSearchBar:search contentsController:self];    //设置代理    displayCon.searchResultsDataSource =self;    displayCon.searchResultsDelegate =self;    //设置头视图    self.table.tableHeaderView = search;//    _resultArr = [[NSMutableArray alloc]init];}//返回多少行数据-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    if (self.table == tableView) {        return _allData.count;    }else{        return _resultArr.count;    }}//cell-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *cellId = @"cellid";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];    if (!cell) {        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellId];    }    if (self.table == tableView) {        cell.textLabel.text = _allData[indexPath.row];    }else{        cell.textLabel.text = [_resultArr objectAtIndex:indexPath.row];    }    return cell;}//搜索条- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{    NSMutableArray *tmp = [NSMutableArray array];    //筛选数据  把输入的字母全部转换为大写（让判断不区分大小写）    NSString *str = [search.text uppercaseString];    //遍历人名数组    for (NSString *s in _allData) {        //判断是否以输入的字母开头        if([[s uppercaseString] hasPrefix:str] ){            [tmp addObject:s];        }    }    _resultArr = [NSArray arrayWithArray:tmp];    [self.table reloadData];}