iOS8之前我们使用UISearchDisplayController做TableView的本地搜索，查看UIKit库，苹果已经使用新控件取代它。

NS_CLASS_DEPRECATED_IOS(3_0, 8_0, "UISearchDisplayController has been replaced with UISearchController") __TVOS_PROHIBITED

使用UISearchDisplayController的时候，搜索结果的展示tableView系统已经帮我们封装好，但是使用UISearchController，我们需要提供一个搜索结果的展示TableView.

如何使用UISearchController实现搜索功能呢？

1创建一个搜索结果展示TableViewController

.h文件

#import <UIKit/UIKit.h>    @interface SearchResultVC : UITableViewController  // 搜索结果数据  @property (nonatomic, strong) NSMutableArray *resultsArray;  @end

.m

#import "SearchResultVC.h"    @interface SearchResultVC ()    @end    @implementation SearchResultVC    - (void)viewDidLoad {      [super viewDidLoad];  }    - (void)didReceiveMemoryWarning {      [super didReceiveMemoryWarning];      // Dispose of any resources that can be recreated.  }    #pragma mark - Table view data source      - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {     return self.resultsArray.count;  }      - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {      UITableViewCell *cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"RESULT_CELL"];      if (cell == nil) {          cell = [tableView dequeueReusableCellWithIdentifier:@"RESULT_CELL"];      }      cell.textLabel.text = self.resultsArray[indexPath.row];      cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;      return cell;    }

2 创建一个UISearchController

- (void)initSearchController{      SearchResultVC *resultTVC = [[SearchResultVC alloc] initWithStyle:UITableViewStylePlain];      UINavigationController *resultVC = [[UINavigationController alloc] initWithRootViewController:resultTVC];      self.searchController = [[UISearchController alloc]initWithSearchResultsController:resultVC];      self.searchController.searchResultsUpdater = self;      //self.searchController.dimsBackgroundDuringPresentation = NO;      //self.searchController.hidesNavigationBarDuringPresentation = NO;      self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x,self.searchController.searchBar.frame.origin.y,self.searchController.searchBar.frame.size.width,44);      self.tableView.tableHeaderView = self.searchController.searchBar;          self.searchController.searchBar.delegate = self;  }

3 实现UISearchController的UISearchResultsUpdating方法，当开始搜索的时候响应。并且实现筛选的逻辑

#pragma mark - UISearchResultsUpdating    - (void)updateSearchResultsForSearchController:(UISearchController *)searchController{      UINavigationController *navController = (UINavigationController *)self.searchController.searchResultsController;      SearchResultVC *resultVC = (SearchResultVC *)navController.topViewController;      [self filterContentForSearchText:self.searchController.searchBar.text];      resultVC.resultsArray = self.tempsArray;      [resultVC.tableView reloadData];  }    #pragma mark - Private Method  - (void)filterContentForSearchText:(NSString *)searchText{      NSLog(@"%@",searchText);      NSUInteger searchOptions = NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch;      [self.tempsArray removeAllObjects];      for (int i = 0; i < self.resultArray.count; i++) {          NSString *title = self.resultArray[i];          NSRange storeRange = NSMakeRange(0, title.length);          NSRange foundRange = [title rangeOfString:searchText options:searchOptions range:storeRange];          if (foundRange.length) {              [self.tempsArray addObject:self.resultArray[i]];          }      }  }

完成了，就是这么简单，UI什么的可以自定义。简单demo可以去我github上下载： https://github.com/wangdachui/WTUISearchController