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