使用UISearchDisplayController

使用UISearchDisplayController

虽然UISearchDisplayController名字中带有controller,可他不是一个UIView相关的controller,因为,切换显示UISearchDisplayController的时候,它并没有在UIWindow中加载(UIWindow一次只能加载一个controller,所以可以证明它不属于controller).

可以看看,他是继承自NSObject,是多个控件组合在一起的一个东西.

以下是使用时的效果图:

源码:

//
//  RootViewController.m
//  TableViewSearch
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "RootViewController.h"

@interface RootViewController ()
<UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate, UISearchDisplayDelegate>

@property (nonatomic, strong) UITableView               *dataView;          // tableView
@property (nonatomic, strong) UISearchDisplayController *searchController;  // 搜索控制器

@property (nonatomic, strong) NSArray                   *names;             // 数据源
@property (nonatomic, strong) NSArray                   *searchResults;     // 搜索结果

@end

#define APP_HEIGHT  [UIScreen mainScreen].applicationFrame.size.height
#define SCR_HEIGHT  [UIScreen mainScreen].bounds.size.height
#define SCR_WIDTH   [UIScreen mainScreen].bounds.size.width

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // 初始化tableView
    _dataView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, SCR_WIDTH, SCR_HEIGHT - 20)
                                             style:UITableViewStylePlain];
    _dataView.delegate   = self;
    _dataView.dataSource = self;
    [self.view addSubview:_dataView];
    
    // 初始化searchBar
    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
    searchBar.delegate     = self;
    searchBar.placeholder  = @"搜索";
    [searchBar sizeToFit];
    
    // 将searchBar放置在tableView的HeaderView中
    self.dataView.tableHeaderView = searchBar;

    // 初始化search控制器并获取searchBar以及当前视图控制器
    _searchController = 
        [[UISearchDisplayController alloc] initWithSearchBar:searchBar
                                          contentsController:self];
    _searchController.delegate                = self;
    _searchController.searchResultsDataSource = self;
    _searchController.searchResultsDelegate   = self;
    
    // tableView的数据源
    _names = @[@"Aaliyah", @"Aaron", @"Abigail", @"Adam", @"Addison", @"Adrian", @"Aiden", @"Alex", @"Alexa", @"Alexander", @"Alexandra", @"Alexis", @"Allison", @"Alyssa", @"Amelia", @"Andrea", @"Andrew", @"Angel", @"Anna", @"Annabelle", @"Anthony", @"Aria", @"Ariana", @"Arianna", @"Ashley", @"Aubree", @"Aubrey", @"Audrey", @"Austin", @"Autumn", @"Ava", @"Avery", @"Ayden", @"Bailey", @"Bella", @"Benjamin", @"Bentley", @"Blake", @"Brandon", @"Brayden", @"Brianna", @"Brody", @"Brooklyn", @"Bryson", @"Caleb", @"Cameron", @"Camila", @"Carlos", @"Caroline", @"Carson", @"Carter", @"Charles", @"Charlotte", @"Chase", @"Chloe", @"Christian", @"Christopher", @"Claire", @"Colton", @"Connor", @"Cooper", @"Damian", @"Daniel", @"David", @"Dominic", @"Dylan", @"Easton", @"Eli", @"Elijah", @"Elizabeth", @"Ella", @"Ellie", @"Emily", @"Emma", @"Ethan", @"Eva", @"Evan", @"Evelyn", @"Faith", @"Gabriel", @"Gabriella", @"Gavin", @"Genesis", @"Gianna", @"Grace", @"Grayson", @"Hailey", @"Hannah", @"Harper", @"Henry", @"Hudson", @"Hunter", @"Ian", @"Isaac", @"Isabella", @"Isaiah", @"Jace", @"Jack", @"Jackson", @"Jacob", @"James", @"Jasmine", @"Jason", @"Jaxon", @"Jayden", @"Jeremiah", @"Jocelyn", @"John", @"Jonathan", @"Jordan", @"Jose", @"Joseph", @"Joshua", @"Josiah", @"Juan", @"Julia", @"Julian", @"Justin", @"Katherine", @"Kayden", @"Kayla", @"Kaylee", @"Kennedy", @"Kevin", @"Khloe", @"Kimberly", @"Kylie", @"Landon", @"Lauren", @"Layla", @"Leah", @"Levi", @"Liam", @"Lillian", @"Lily", @"Logan", @"London", @"Lucas", @"Lucy", @"Luis", @"Luke", @"Lydia", @"Mackenzie", @"Madeline", @"Madelyn", @"Madison", @"Makayla", @"Mason", @"Matthew", @"Maya", @"Melanie", @"Mia", @"Michael", @"Molly", @"Morgan", @"Naomi", @"Natalie", @"Nathan", @"Nathaniel", @"Nevaeh", @"Nicholas", @"Noah", @"Nolan", @"Oliver", @"Olivia", @"Owen", @"Parker", @"Peyton", @"Piper", @"Reagan", @"Riley", @"Robert", @"Ryan", @"Ryder", @"Samantha", @"Samuel", @"Sarah", @"Savannah", @"Scarlett", @"Sebastian", @"Serenity", @"Skylar", @"Sofia", @"Sophia", @"Sophie", @"Stella", @"Sydney", @"Taylor", @"Thomas", @"Trinity", @"Tristan", @"Tyler", @"Victoria", @"Violet", @"William", @"Wyatt", @"Xavier", @"Zachary", @"Zoe", @"Zoey"];
}

//===============================================
#pragma mark -
#pragma mark - tableView相关代理
//===============================================
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.dataView)
    {
        return [self.names count];
    }
    else
    {
        return [self.searchResults count];
    }
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath
                             animated:YES];
}

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

//===============================================
#pragma mark -
#pragma mark UISearchDisplayController相关代理
//===============================================

- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller
{
    NSLog(@"将要开始搜索");
}

- (void)searchDisplayControllerDidBeginSearch:(UISearchDisplayController *)controller
{
    NSLog(@"开始搜索");
}

- (void)searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller
{
    NSLog(@"将要结束搜索");
}

- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller
{
    NSLog(@"结束搜索");
}

- (void)searchDisplayController:(UISearchDisplayController *)controller
  didLoadSearchResultsTableView:(UITableView *)tableView
{
    NSLog(@"加载了tableView");
}

- (void)searchDisplayController:(UISearchDisplayController *)controller
willUnloadSearchResultsTableView:(UITableView *)tableView
{
    NSLog(@"卸载了tableView");
}

- (void)searchDisplayController:(UISearchDisplayController *)controller
 willShowSearchResultsTableView:(UITableView *)tableView
{
    NSLog(@"将要显示tableView");
}

- (void)searchDisplayController:(UISearchDisplayController *)controller
  didShowSearchResultsTableView:(UITableView *)tableView
{
    NSLog(@"已经显示了tableView");
}

- (void)searchDisplayController:(UISearchDisplayController *)controller
 willHideSearchResultsTableView:(UITableView *)tableView
{
    NSLog(@"将要隐藏tableView");
}

- (void)searchDisplayController:(UISearchDisplayController *)controller
  didHideSearchResultsTableView:(UITableView *)tableView
{
    NSLog(@"已经隐藏了tableView");
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller
shouldReloadTableForSearchString:(NSString *)searchString
{
    NSLog(@"要重新加载tableView显示搜索的数据么?");
    
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[cd] %@", searchString];
    self.searchResults = [self.names filteredArrayUsingPredicate:predicate];
    
    return YES;
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller
shouldReloadTableForSearchScope:(NSInteger)searchOption
{
    NSLog(@"要重新加载tableView的搜索域么?");
    return YES;
}

@end

UISearchDisplayController自带了tableView,也是走的代理方法,与你的controller中的tableView一样的代理方法,这点需要注意: