iOS 用UISearchDisplayController实现查找功能

　　UISearchDisplayController是iOS中用于处理搜索功能的控制器，此控制器需要和UISearchBar结合使用

　　示例代码如下：

 //
 //  WKRootViewController.m
 //  表格视图的搜索功能
 //
 //  Created by student on 14-10-20.
 //  Copyright (c) 2014年 wukong. All rights reserved.
 //

 #import "WKRootViewController.h"

 @interface WKRootViewController ()

 @property (strong, nonatomic) NSMutableArray* dataSource;

 @property (strong, nonatomic)NSMutableArray* resultArrat;

 @end

 @implementation WKRootViewController
 {
     //用于加载数据源的表视图
     UITableView *_tableView;

     UISearchBar *_searchBar;

     UISearchDisplayController *_searchControl;
 }
 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     if (self) {
         // Custom initialization
     }
     return self;
 }

 - (void)viewDidLoad
 {
     [super viewDidLoad];

     [self createUI];
     [self createDataSource];
     // Do any additional setup after loading the view.
 }

 - (void)createDataSource
 {
     _dataSource = [[NSMutableArray alloc] init];
     _resultArrat = [[NSMutableArray alloc] init];
     for (int i = 'A'; i <= 'z'; i++) {
         NSMutableArray *section = [[NSMutableArray alloc] init];
         for (int j = ; j <= ; j++) {
             NSString *str = [NSString stringWithFormat:@"%c-%d", i, j];
             [section addObject:str];
         }
         [_dataSource addObject:section];
     }
 }

 #pragma mark- UITableViewDataSource

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
     //判断当前展示的表格
     if (tableView != _tableView)
         return ;
     return _dataSource.count;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
     if (tableView != _tableView) {
         return _resultArrat.count;
     }
     return [[_dataSource objectAtIndex:section] count];
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     [tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];

     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
     if (tableView != _tableView) {
         cell.textLabel.text = [_resultArrat objectAtIndex:indexPath.row];
     }else{
         cell.textLabel.text = [[_dataSource objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
     }
     return cell;
 }

 - (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 #pragma mark - CreateUI
 - (void)createUI
 {
     _tableView = [[UITableView alloc] initWithFrame:CGRectMake(, , , ) style:UITableViewStylePlain];
     _tableView.delegate = self;
     _tableView.dataSource = self;
     [self.view addSubview:_tableView];

     _searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(, , , )];
     _searchBar.searchBarStyle = UISearchBarStyleMinimal;
     _searchBar.delegate = self;
     [_tableView setTableHeaderView:_searchBar];
     /*
      第一个参数：用于输入搜索内容的UISearchBar对象
      第二个参数：提供给我的表格视图数据源的控制器对象，这个对象必须是实现了表格的两个协议
      */
     _searchControl = [[UISearchDisplayController alloc] initWithSearchBar:_searchBar contentsController:self];
 //    _searchControl.searchResultsTableView
 //    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 60, 30)];
 //    label.backgroundColor =[UIColor redColor];
 //    [_searchControl.searchResultsTableView setTableHeaderView:label];
     //设置_searchControl自带的表格视图的委托对象
     [_searchControl setSearchResultsDataSource:self];
     [_searchControl setSearchResultsDelegate:self];
 }

 #pragma mark -UISearchBarDelegate
 - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
 {
     [_resultArrat removeAllObjects];
     NSString *str = [NSString stringWithFormat:@"*%@*", searchText];
     NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF like %@", str];
     for (NSMutableArray *arr in _dataSource) {
         for (NSString *str in arr) {
             if ([pred evaluateWithObject:str]) {
                 [_resultArrat addObject:str];
             }
         }
     }
 }
 @end