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 = 1; j <= 10; 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 1;
    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(10, 30, 300, 440) style:UITableViewStylePlain];
    _tableView.delegate = self;
    _tableView.dataSource = self;
    [self.view addSubview:_tableView];
    
    _searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 300, 30)];
    _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