iOS-UISearchController用法

import "ViewController.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate,UISearchResultsUpdating>
@property (strong,nonatomic) NSMutableArray  *dataList;
@property (strong,nonatomic) NSMutableArray  *searchList;
@property (nonatomic, strong) UISearchController *searchController;
@end
@implementation ViewController
{

    UITableView * _tableView;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    _dataList = [NSMutableArray  array];

    _searchList = [NSMutableArray array];

    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height - 44) style:UITableViewStylePlain];

    _tableView.delegate = self;

    _tableView.dataSource = self;

    [self.view addSubview:_tableView];

    _searchController = [[UISearchController alloc] initWithSearchResultsController:nil];

    _searchController.searchResultsUpdater = self;

    _searchController.dimsBackgroundDuringPresentation = NO;

    _searchController.hidesNavigationBarDuringPresentation = NO;

    _searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);

   _tableView.tableHeaderView = self.searchController.searchBar;
    
    self.dataList=[NSMutableArray arrayWithCapacity:100];
    
    for (NSInteger i=0; i<100; i++) {

        [self.dataList addObject:[NSString stringWithFormat:@"%ld-FlyElephant",(long)i]];

    }

}
 
//设置区域

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

    return 1;

}

//设置区域的行数

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    if (self.searchController.active) {

        return [self.searchList count];

    }else{

        return [self.dataList count];

    }

}

//返回单元格内容

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *flag=@"cellFlag";

    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:flag];

    if (cell==nil) {

        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:flag];

    }

    if (self.searchController.active) {

        [cell.textLabel setText:self.searchList[indexPath.row]];

    }

    else{

        [cell.textLabel setText:self.dataList[indexPath.row]];

    }

    return cell;

}

-(void)updateSearchResultsForSearchController:(UISearchController *)searchController {

    NSString *searchString = [self.searchController.searchBar text];

    NSPredicate *preicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];

    if (self.searchList!= nil) {

        [self.searchList removeAllObjects];

    }

    //过滤数据

    self.searchList= [NSMutableArray arrayWithArray:[_dataList filteredArrayUsingPredicate:preicate]];

    //刷新表格

    [_tableView reloadData];

}- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}