如何实现IOS_SearchBar搜索栏及关键字高亮

//获取文件的路径path
NSString *path = [[NSBundle mainBundle] pathForResource:@"heros" ofType:@"txt"];
//将路径下的文件转换成NSData数据
NSData *data = [NSData dataWithContentsOfFile:path];
//将得到的NSdata数据进行JSON解析并返回一个结果数组result
id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

// 将搜索范围的内容放入数组
for (NSDictionary *diction in result) {
  [self.arrOfSeachBoxes addObject:diction[@"nick"]];
 }

@property (nonatomic, retain) UISearchController *searchController;

// nil表示在当前页面显示搜索结果
self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController;

NS_ASSUME_NONNULL_BEGIN
@interface ViewController () <UITableViewDelegate, UITableViewDataSource, UISearchResultsUpdating>
@property (nonatomic, retain) NSMutableArray *arrOfSeachBoxes;/**< 搜索范围 */
@property (nonatomic, retain) NSMutableArray *arrOfSeachResults;/**< 搜索结果 */
@property (nonatomic, retain) UISearchController *searchController;
@property (nonatomic, retain) UITableView *tableView;
@end
NS_ASSUME_NONNULL_END

// 解析数据
NSString *path = [[NSBundle mainBundle] pathForResource:@"heros" ofType:@"txt"];
NSData *data = [NSData dataWithContentsOfFile:path];
id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
self.arrOfSeachBoxes = [NSMutableArray array];
// 将搜索范围的内容放入数组
for (NSDictionary *dic in result) {
 [self.arrOfSeachBoxes addObject:dic[@"nick"]];
}

// 创建
self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];

//searchBar的frame
self.searchController.searchBar.frame = CGRectMake(0, 44, 0, 44);

// 是否需要在输入搜索内容时变暗
self.searchController.dimsBackgroundDuringPresentation = false;

self.searchController.searchBar.showsCancelButton = YES;/**< 取消按钮 */

self.searchController.searchResultsUpdater = self;/**< 显示搜索结果的VC */

self.searchController.active = YES;/**< 搜索结果显示 */

// tableView
self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, self.view.bounds.size.width, self.view.bounds.size.height - 20) style:UITableViewStylePlain];

[self.view addSubview:self.tableView];

self.tableView.delegate = self;

self.tableView.dataSource = self;

[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"pool"];

//将SearchBar放在tableView的头部视图 
self.tableView.tableHeaderView = self.searchController.searchBar;

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {

//初始化存储搜索结果的数组
self.arrOfSeachResults = [NSMutableArray array];

// 获取关键字
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchController.searchBar.text];

// 用关键字过滤数组中的内容, 将过滤后的内容放入结果数组
self.arrOfSeachResults = [[self.arrOfSeachBoxes filteredArrayUsingPredicate:predicate] mutableCopy];

// 完成数据的过滤和存储后刷新tableView.
[self.tableView reloadData];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

// 显示搜索结果时
if (self.searchController.active) {

 //以搜索结果的个数返回行数
 return self.arrOfSeachResults.count;
}
 //没有搜索时显示所有数据
 return self.arrOfSeachBoxes.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"pool"];

// 显示搜索结果时
if (self.searchController.active) {

// 原始搜索结果字符串.
NSString *originResult = self.arrOfSeachResults[indexPath.row];

// 获取关键字的位置
NSRange range = [originResult rangeOfString:self.searchController.searchBar.text];

// 转换成可以操作的字符串类型.
NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:originResult];

// 添加属性(粗体)
[attribute addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:range];

// 关键字高亮
[attribute addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range];

// 将带属性的字符串添加到cell.textLabel上.
[cell.textLabel setAttributedText:attribute];

cell.textLabel.text = self.arrOfSeachResults[indexPath.row];

 } else {

 cell.textLabel.text = self.arrOfSeachBoxes[indexPath.row];

  }

 return cell;
}