UITableView + UISearchBar 实现搜索功能

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;


@end

#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    
    self.window.rootViewController = [[RootViewController alloc] init];
    
    [self.window makeKeyAndVisible];
    return YES;
}

@end

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"
#import "YXPresident.h"
#define Width [UIScreen mainScreen].bounds.size.width
#define Height [UIScreen mainScreen].bounds.size.height
#define gapHeight 20
#define Sheight 50

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

@property (nonatomic, strong) UISearchBar *searchBar;
@property (nonatomic, strong) UITableView *mTableView;
@property (nonatomic, strong) NSArray *presidents;
@property (nonatomic, strong) NSArray *filteredPresident;

@end

@implementation RootViewController

- (void)loadView
{
    [super loadView];
    // 初始化searchBar
    self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, gapHeight, Width, Sheight)];
    self.searchBar.delegate = self;
    
    [self.view addSubview:self.searchBar];
    // 初始化mTableView
    self.mTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, gapHeight+Sheight, Width, Height - Sheight - gapHeight) style:UITableViewStylePlain];
    self.mTableView.dataSource = self;
    self.mTableView.delegate = self;
    [self.view addSubview:self.mTableView];
}
/**
 * 初始化数组
 */
- (void)viewDidLoad {
    [super viewDidLoad];
    self.presidents = [[NSArray alloc] initWithObjects:
                       [YXPresident presidentWithFirstName:@"George" lastName:@"Washington"],
                       [YXPresident presidentWithFirstName:@"John" lastName:@"Adams"],
                       [YXPresident presidentWithFirstName:@"Thomas" lastName:@"Jeffeson"],
                       [YXPresident presidentWithFirstName:@"James" lastName:@"Madison"],
                       [YXPresident presidentWithFirstName:@"James" lastName:@"Monroe"],
                       [YXPresident presidentWithFirstName:@"John Quincy" lastName:@"Adams"],
                       [YXPresident presidentWithFirstName:@"Andrew" lastName:@"Jackson"],
                       [YXPresident presidentWithFirstName:@"Martin" lastName:@"van Buren"],
                       [YXPresident presidentWithFirstName:@"William Henry" lastName:@"Harrison"],
                       [YXPresident presidentWithFirstName:@"John" lastName:@"Tyler"],
                       [YXPresident presidentWithFirstName:@"James K" lastName:@"Polk"],
                       [YXPresident presidentWithFirstName:@"Zachary" lastName:@"Taylor"],
                       [YXPresident presidentWithFirstName:@"Millard" lastName:@"Fillmore"],
                       [YXPresident presidentWithFirstName:@"Franklin" lastName:@"Pierce"],
                       [YXPresident presidentWithFirstName:@"James" lastName:@"Buchanan"],
                       [YXPresident presidentWithFirstName:@"Abraham" lastName:@"Lincoln"],
                       [YXPresident presidentWithFirstName:@"Andrew" lastName:@"Johnson"],
                       [YXPresident presidentWithFirstName:@"Ulysses S" lastName:@"Grant"],
                       [YXPresident presidentWithFirstName:@"Rutherford B" lastName:@"Hayes"],
                       [YXPresident presidentWithFirstName:@"James A" lastName:@"Garfield"],
                       [YXPresident presidentWithFirstName:@"Chester A" lastName:@"Arthur"],
                       [YXPresident presidentWithFirstName:@"Grover" lastName:@"Cleveland"],
                       [YXPresident presidentWithFirstName:@"Bejamin" lastName:@"Harrison"],
                       [YXPresident presidentWithFirstName:@"Grover" lastName:@"Cleveland"],
                       [YXPresident presidentWithFirstName:@"William" lastName:@"McKinley"],
                       [YXPresident presidentWithFirstName:@"Theodore" lastName:@"Roosevelt"],
                       [YXPresident presidentWithFirstName:@"William Howard" lastName:@"Taft"],
                       [YXPresident presidentWithFirstName:@"Woodrow" lastName:@"Wilson"],
                       [YXPresident presidentWithFirstName:@"Warren G" lastName:@"Harding"],
                       [YXPresident presidentWithFirstName:@"Calvin" lastName:@"Coolidge"],
                       [YXPresident presidentWithFirstName:@"Herbert" lastName:@"Hoover"],
                       [YXPresident presidentWithFirstName:@"Franklin D" lastName:@"Roosevelt"],
                       [YXPresident presidentWithFirstName:@"Harry S" lastName:@"Truman"],
                       [YXPresident presidentWithFirstName:@"Dwight D" lastName:@"Eisenhower"],
                       [YXPresident presidentWithFirstName:@"John F" lastName:@"Kennedy"],
                       [YXPresident presidentWithFirstName:@"Lyndon B" lastName:@"Johnson"],
                       [YXPresident presidentWithFirstName:@"Richard" lastName:@"Nixon"],
                       [YXPresident presidentWithFirstName:@"Gerald" lastName:@"Ford"],
                       [YXPresident presidentWithFirstName:@"Jimmy" lastName:@"Carter"],
                       [YXPresident presidentWithFirstName:@"Ronald" lastName:@"Reagan"],
                       [YXPresident presidentWithFirstName:@"George H W" lastName:@"Bush"],
                       [YXPresident presidentWithFirstName:@"Bill" lastName:@"Clinton"],
                       [YXPresident presidentWithFirstName:@"George W" lastName:@"Bush"],
                       [YXPresident presidentWithFirstName:@"Barack" lastName:@"Obama"],
                       nil];

}

#pragma mark - UITableViewDelegate - 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (self.filteredPresident != nil) {
        return [self.filteredPresident count];
    }
    else{
        return [self.presidents count];
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *Identify = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:Identify];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:Identify];
    }
    YXPresident *president = [[YXPresident alloc] init];
    if (self.filteredPresident != nil) {
        president = [self.filteredPresident objectAtIndex:indexPath.row];
    }else{
        president = [self.presidents objectAtIndex:indexPath.row];
    }
    if (president) {
        cell.textLabel.text = [NSString stringWithFormat:@"%@ %@",president.firstName, president.lastName];
    }
    return cell;
}

#pragma mark - Content Filtering
- (void)filterContentForSearchText:(NSString *)searchText
{
    // 设置搜索条件
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"firstName CONTAINS[cd] %@ OR lastName CONTAINS[cd] %@",searchText,searchText];
    // 返回搜索结果
    self.filteredPresident = [self.presidents filteredArrayUsingPredicate:predicate];
}
#pragma mark - UISearchBarDelegate - 
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    [self filterContentForSearchText:searchText ];
    if (self.filteredPresident.count == 0 && [searchBar.text  isEqual: @""]) {
        self.filteredPresident = nil;
    }
    [self.mTableView reloadData];
}

@end

#import <Foundation/Foundation.h>

@interface YXPresident : NSObject

@property (nonatomic, copy) NSString *firstName;
@property (nonatomic, copy) NSString *lastName;

+ (YXPresident *)presidentWithFirstName:(NSString *)firstName lastName:(NSString *)lastName;

@end

#import "YXPresident.h"

@implementation YXPresident
@synthesize firstName, lastName;

+ (YXPresident *)presidentWithFirstName:(NSString *)firstName lastName:(NSString *)lastName
{
    YXPresident *president = [[YXPresident alloc] init];
    president.firstName = firstName;
    president.lastName = lastName;
    return president;
}

@end