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：

  1 //
  2 //  WKRootViewController.m
  3 //  表格视图的搜索功能
  4 //
  5 //  Created by student on 14-10-20.
  6 //  Copyright (c) 2014年 wukong. All rights reserved.
  7 //
  8 
  9 #import "WKRootViewController.h"
 10 
 11 @interface WKRootViewController ()
 12 
 13 @property (strong, nonatomic) NSMutableArray* dataSource;
 14 
 15 @property (strong, nonatomic)NSMutableArray* resultArrat;
 16 
 17 
 18 @end
 19 
 20 @implementation WKRootViewController
 21 {
 22     //用于加载数据源的表视图
 23     UITableView *_tableView;
 24     
 25     UISearchBar *_searchBar;
 26     
 27     UISearchDisplayController *_searchControl;
 28 }
 29 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 30 {
 31     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 32     if (self) {
 33         // Custom initialization
 34     }
 35     return self;
 36 }
 37 
 38 - (void)viewDidLoad
 39 {
 40     [super viewDidLoad];
 41     
 42     [self createUI];
 43     [self createDataSource];
 44     // Do any additional setup after loading the view.
 45 }
 46 
 47 - (void)createDataSource
 48 {
 49     _dataSource = [[NSMutableArray alloc] init];
 50     _resultArrat = [[NSMutableArray alloc] init];
 51     for (int i = 'A'; i <= 'z'; i++) {
 52         NSMutableArray *section = [[NSMutableArray alloc] init];
 53         for (int j = 1; j <= 10; j++) {
 54             NSString *str = [NSString stringWithFormat:@"%c-%d", i, j];
 55             [section addObject:str];
 56         }
 57         [_dataSource addObject:section];
 58     }
 59 }
 60 
 61 #pragma mark- UITableViewDataSource
 62 
 63 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 64 {
 65     //判断当前展示的表格
 66     if (tableView != _tableView)
 67         return 1;
 68     return _dataSource.count;
 69 }
 70 
 71 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 72 {
 73     if (tableView != _tableView) {
 74         return _resultArrat.count;
 75     }
 76     return [[_dataSource objectAtIndex:section] count];
 77 }
 78 
 79 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 80 {
 81     [tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
 82     
 83     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
 84     if (tableView != _tableView) {
 85         cell.textLabel.text = [_resultArrat objectAtIndex:indexPath.row];
 86     }else{
 87         cell.textLabel.text = [[_dataSource objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
 88     }
 89     return cell;
 90 }
 91 
 92 - (void)didReceiveMemoryWarning
 93 {
 94     [super didReceiveMemoryWarning];
 95     // Dispose of any resources that can be recreated.
 96 }
 97 
 98 
 99 #pragma mark - CreateUI
100 - (void)createUI
101 {
102     _tableView = [[UITableView alloc] initWithFrame:CGRectMake(10, 30, 300, 440) style:UITableViewStylePlain];
103     _tableView.delegate = self;
104     _tableView.dataSource = self;
105     [self.view addSubview:_tableView];
106     
107     _searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 300, 30)];
108     _searchBar.searchBarStyle = UISearchBarStyleMinimal;
109     _searchBar.delegate = self;
110     [_tableView setTableHeaderView:_searchBar];
111     /*
112      第一个参数：用于输入搜索内容的UISearchBar对象
113      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
114      */
115     _searchControl = [[UISearchDisplayController alloc] initWithSearchBar:_searchBar contentsController:self];
116 //    _searchControl.searchResultsTableView
117 //    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 60, 30)];
118 //    label.backgroundColor =[UIColor redColor];
119 //    [_searchControl.searchResultsTableView setTableHeaderView:label];
120     //设置_searchControl自带的表格视图的委托对象
121     [_searchControl setSearchResultsDataSource:self];
122     [_searchControl setSearchResultsDelegate:self];
123 }
124 
125 #pragma mark -UISearchBarDelegate
126 - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
127 {
128     [_resultArrat removeAllObjects];
129     NSString *str = [NSString stringWithFormat:@"*%@*", searchText];
130     NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF like %@", str];
131     for (NSMutableArray *arr in _dataSource) {
132         for (NSString *str in arr) {
133             if ([pred evaluateWithObject:str]) {
134                 [_resultArrat addObject:str];
135             }
136         }
137     }
138 }
139 @end