刚学习搜索框控件，写了个最简单的dome

#import <UIKit/UIKit.h>

.h

@interface ViewController : UIViewController<UISearchBarDelegate,UISearchDisplayDelegate,UITableViewDataSource,UITableViewDelegate>

@property (nonatomic,strong) UISearchDisplayController *searchDisplayC;//搜索框控件控制器
@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;//搜索条
@property (nonatomic,strong) NSArray *allArray;//所有数据数组
@property (nonatomic,strong) NSMutableArray *filterArray;//搜索出来的数据数组


@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize searchBar;
@synthesize searchDisplayC;
@synthesize filterArray;
@synthesize allArray;

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    allArray = [NSArray arrayWithObjects:@"济南",@"天津",@"潍坊",@"上海",@"北京",@"青岛",@"台湾",@"钓鱼岛", nil];
    searchDisplayC = [[UISearchDisplayController alloc]initWithSearchBar:searchBar contentsController:self];
    searchDisplayC.delegate = self;
    searchDisplayC.searchResultsDelegate = self;
    searchDisplayC.searchResultsDataSource = self;
	// Do any additional setup after loading the view, typically from a nib.
}
#pragma mark - tabledelegete

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return filterArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }
    cell.textLabel.text = [filterArray objectAtIndex:indexPath.row];
    [cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //选择后要做的事情
    NSLog(@"已选择");
}
#pragma mark - searchdelegate

- (BOOL) searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    [filterArray removeAllObjects];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains[c] %@",searchString];//用于过滤
    filterArray = [NSMutableArray arrayWithArray:[allArray filteredArrayUsingPredicate:predicate]];
    return  YES;
}

- (BOOL) searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
    //当scope改变时调用
    return YES;
}
@end

iOS 搜索框控件 最简单的dome