UISearchBar用法

1、直接看代码吧

//
//  ViewController.m

#import "ViewController.h"

@interface ViewController () <UISearchBarDelegate, UITableViewDataSource, UITableViewDelegate>
{
    UITableView * _tableView;
    NSMutableArray * _dataArray;
    NSMutableArray * _subDataArray;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    
    [self configTableView];
    
    
    UISearchBar * searchBar = [[UISearchBar alloc] init];
    searchBar.frame = CGRectMake(0, 0, _tableView.frame.size.width, 0);
    searchBar.delegate = self;
    [searchBar sizeToFit]; //主动调剂大小
    _tableView.tableHeaderView = searchBar;
    
}

- (void) configTableView {
    CGFloat width = [[UIScreen mainScreen] bounds].size.width;
    CGFloat height = [[UIScreen mainScreen] bounds].size.height;
    CGRect tableViewFrame = CGRectMake(0, 0, width, height);
    _tableView = [[UITableView alloc] initWithFrame:tableViewFrame style:UITableViewStylePlain];
    [self.view addSubview:_tableView];
    _tableView.delegate = self;
    _tableView.dataSource = self;
    
    //备份数据源
    _dataArray = [[NSMutableArray alloc] init];
    for (int i = 0; i < 100; i++) {
        [_dataArray addObject:[NSString stringWithFormat:@"%i", i]];
    }
    //数据源
    _subDataArray = [[NSMutableArray alloc] initWithArray:_dataArray];
}


#pragma mark UISearchBarDelegate
//点击键盘上得search按钮 开端调用此办法
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    //清空数据源
    [_subDataArray removeAllObjects];
    NSString * getStr = searchBar.text;
    //从备份数据源查找符合条件的数据，并参加到数据源中
    for (NSString * str in _dataArray) {
        if ([str containsString:getStr]) {
            [_subDataArray addObject:str];
        }
    }
    //更新UI
    [_tableView reloadData];
    //让键盘失去第一响应者
    [searchBar resignFirstResponder];
}



#pragma mark UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _subDataArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString * cellid = @"cellid";
    UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:cellid];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellid];
    }
    cell.textLabel.text = _subDataArray[indexPath.row];
    return cell;
}


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

@end
//
//  ViewController.m

#import "ViewCo