UISerachBar / UISearchDisplayController

1. UISerachBar 

继承与UIView, 包含uitextfield, 并且实现了uitextfielddelegate代理的主要内容

含有取消按钮, 默认不显示

2. UISerachDisplayController

包含 uisearchbar, uitableview, uinavigaitionitem 以及 uiviewcontroller

每一个uiviewcontroller有一个类型为UISerachDisplayController的属性, 但默认为nil

demo:

#import <UIKit/UIKit.h>

@interface MainViewController : UITableViewController{
    NSArray *data;
    NSArray *filterData;
    UISearchDisplayController *searchDisplayController;
}

@end

#import "MainViewController.h"

@interface MainViewController ()

@end

@implementation MainViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        data = [NSArray arrayWithObjects:@"Allan",@"Abbbb",@"Acccc",@"Bccccc",@"Cddddffk",@"Cddkllll",@"Ekkflfl",@"Ekljljfg" ,@"Leslie",@"Mm",@"Meinv",@"Meihi",@"Catilin",@"Arron", nil];
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width
                                                                           , 44)];
    searchBar.placeholder = @"搜索";
    
    // 添加 searchbar 到 headerview
    self.tableView.tableHeaderView = searchBar;
    
    // 用 searchbar 初始化 SearchDisplayController
    // 并把 searchDisplayController 和当前 controller 关联起来
    searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
    
    // searchResultsDataSource 就是 UITableViewDataSource
    searchDisplayController.searchResultsDataSource = self;
    // searchResultsDelegate 就是 UITableViewDelegate
    searchDisplayController.searchResultsDelegate = self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

/*
 * 如果原 TableView 和 SearchDisplayController 中的 TableView 的 delete 指向同一个对象
 * 需要在回调中区分出当前是哪个 TableView
 */
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.tableView) {
        return data.count;
    }else{
        // 谓词搜索
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self contains [cd] %@",searchDisplayController.searchBar.text];
        filterData =  [[NSArray alloc] initWithArray:[data filteredArrayUsingPredicate:predicate]];
        return filterData.count;
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellId = @"mycell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
    }
    
    if (tableView == self.tableView) {
        cell.textLabel.text = data[indexPath.row];
    }else{
        cell.textLabel.text = filterData[indexPath.row];
    }
    
    return cell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    NSString *text;
    
    if (tableView == self.tableView) {
        text = data[indexPath.row];
    }else{
        text = filterData[indexPath.row];
    }
    
    NSLog(@"you click %d   %@",indexPath.row,text);
}

@end