IOS搜索条

viewController.m

#import "ViewController.h"
#import "TableViewCell.h"

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,UISearchResultsUpdating>
{
    UITableView *table;
    
    UISearchController *sear;
    
    NSMutableArray *arr;
    
    NSArray *arr2;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // 创建表格
    table=[[UITableView alloc]initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height -20)];
    
    [table registerClass:[TableViewCell class] forCellReuseIdentifier:@"Mycell"];
    
    //设置代理
    table.dataSource=self;
    table.delegate=self;
    
    //添加到视图
    [self.view addSubview:table];
    
    //创建搜索条
    sear=[[UISearchController alloc]initWithSearchResultsController:nil];
    
    sear.searchBar.placeholder=@"搜索";
    sear.searchResultsUpdater=self;
    
    
    table.tableHeaderView=sear.searchBar;
    
    //创建数据
    arr=[NSMutableArray arrayWithObjects:@"one",@"two",@"three", nil];
    
    
}
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
    NSPredicate *pre=[NSPredicate predicateWithFormat:@"self contains %@",sear.searchBar.text];
    arr2=[arr filteredArrayUsingPredicate:pre];
    [table reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if(sear.isActive==YES)
    {
        return arr2.count;
    }
    return arr.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    TableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"Mycell" forIndexPath:indexPath];
    
    if(sear.isActive==YES)
    {
        cell.textLabel.text=arr2[indexPath.row];
    }
    else
    {
        cell.textLabel.text=arr[indexPath.row];
    }
    
    return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 50;
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}